Relevant bibliographies by topics / Debinding

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Debinding'

Author: Grafiati
Published: 4 June 2021
Last updated: 14 June 2025

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Journal articles on the topic "Debinding"

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Crombie, C. T. C., and Deborah C. Blaine. "Thermo-Gravimetric Analysis and Debinding Study of Powder Injection Moulded Titanium Alloy." Advanced Materials Research 1019 (October 2014): 210–17. http://dx.doi.org/10.4028/www.scientific.net/amr.1019.210.

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An investigation into the solvent and thermal debinding behaviour of a typical paraffin wax-polymer binder system for titanium alloy Ti-6Al-4V powder injection moulding (PIM) feedstock was conducted. Details of the mixing parameters, powder loading, temperature and mixing speed were evaluated for optimal compounding of the feedstock. The feedstock was injection moulded into 22 mm diameter by 3 mm thick disks. Debinding is conducted in two stages, an initial solvent debinding step to remove the waxes, followed by a thermal debinding step to remove the polymers. Solvent debinding was conducted by immersing the injection moulded specimens in n-heptane heated to 50 °C for a period of 5 hours. The mass loss rate was logged during solvent debinding in order to determine the efficiency of the solvent debinding step. From these measurements, it was determined that 94 wt% of the wax (paraffin wax and stearic acid) components of the binder were removed during solvent debinding. A thermo-gravimetric analysis (TGA) was conducted in air on the Ti-6Al-4V powder, as well as the green and solvent debound feedstock. These results show the effect of debinding the feedstock in air and were used to design a thermal debinding cycle for the system.
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Kim, Sang Woo, and Jeong Sik Park. "Development of Eco-Debinding Process Using Supercritical Extraction of Low Molecular Organic Binders in Ceramic Bodies with Nano-Sized Capillary Structure." Materials Science Forum 620-622 (April 2009): 129–32. http://dx.doi.org/10.4028/www.scientific.net/msf.620-622.129.

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Eco-debinding process using supercritical extraction of low molecular organic binders in nano-porous ceramic bodies was examined. The debinding properties related to structural changes during supercritical extraction and conventional solvent extraction were also compared. The debinding rate of supercritical extraction was significantly enhanced compared to the debinding rate of solvent extraction because of the high diffusivity of the supercritical carbon dioxide for the low molecular weight wax binder in the molded bodies with nano-sized pore structure, although both debinding rates showed same a square root of time dependence. The extraction rates with morphological changes varied depending on the degree of saturation at the end of debinding stages. Both the debinding methods experienced morphological changes with a debinding front separating the pendular state region from the undebinded region with fluid state in low molecular paraffin wax based powder compacts during extraction. The capillary structural changes in the green bodies caused severe defects during extraction and degraded the physical properties. In spite of the abrupt changes of the capillary structure, the debinding defect was significantly alleviated for the supercritical debinded ceramic bodies, compared to the solvent extracted bodies.
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Royer, Alexandre, Jean Claude Gelin, and Thierry Barrière. "Supercritical Debinding of Environmentally Friendly Inconel 718 Feedstock to Metal Injection Moulding Process." Key Engineering Materials 716 (October 2016): 824–29. http://dx.doi.org/10.4028/www.scientific.net/kem.716.824.

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In the MIM process the debinding is a long, complicated and polluting step. The supercritical fluid debinding is a new method to reduce the time of debinding, the default of the pieces and the pollution. The goal of this study is to study the behaviour of an environmentally friendly feedstock of Inconel 718. For this, a binder formulation based on polyethylene glycol, because of is water debinding properties, and bio sourced polymer was made. Polylactic acid was investigated as bio sourced polymer. The debinding is realized with supercritical CO2 as solvent. The results were compared to the traditional debinding method using water at 60°C.
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Seerane, Mandy, Hilda Chikwanda, and Ronald Machaka. "Determination of Optimum Process for Thermal Debinding and Sintering Using Taguchi Method." Materials Science Forum 828-829 (August 2015): 138–44. http://dx.doi.org/10.4028/www.scientific.net/msf.828-829.138.

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Debinding involves long and delicate processing periods of removing binder components from a green body after injection moulding; failure to completely remove the binder components results in distortion, cracking, blisters and contamination at elevated temperatures. This study focuses on optimising thermal debinding process parameters on the basis of obtaining a defect-free part after sintering and also determining a sintering time that gives high sintering density. Thermal debinding was conducted after solvent debinding. The feedstock used to produce green compacts composed of Ti6Al4V powder and a wax-based binder. The binder’s backbone component is a low density polyethylene (LDPE). Careful selection of thermal debinding parameters was guided by thermo-gravimetric analysis (TGA) results. The Taguchi method was used to determine an optimum debinding process. Thermally debound compacts were analysed for residual binder using a TGA. Archimedes’ principle and optical microscopy were done to analyse the sintering density and microstructure of the sintered product, respectively. Optimum debinding and sintering conditions were identified. The study demonstrated that heating rate during debinding was the most influential factor that contributes to minimum residual binder followed by debinding dwell time and temperature. Longer sintering time of 4 h favoured higher density of 91.6 ±1.55%. A typical radial shrinkage level of 11.1 ±0.0816% was determined.
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Shimizu, Toru, Satoshi Mochizuki, Toshio Sano, and Sadakatsu Fuchizawa. "Supercritical CO2 Debinding Method in MIM Process. Debinding Condition and Process in Supercritical Debinding." Journal of the Japan Society of Powder and Powder Metallurgy 43, no. 10 (1996): 1188–92. http://dx.doi.org/10.2497/jjspm.43.1188.

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Takekawa, Junjiro. "Effect of binder composition on debinding and sintering processes of injection molded Fe–8Ni mixed powders." Journal of Materials Research 11, no. 5 (1996): 1127–32. http://dx.doi.org/10.1557/jmr.1996.0144.

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The debinding process of injection-molded compacts of Fe–8Ni mixed powders, containing binders of different ratios of polymers to wax, was investigated. The effect of binder compositions and debinding conditions on the sinterability of the compacts were also studied. Distortions produced in the debinding processes of the compacts were minimized for the case where a ratio of polymer to the total binder contents was 0.35. In the case of the compacts debound in air, sintered densities increased by increasing the debinding temperature up to 350 °C, then decreased sharply for higher debinding temperatures. In the compacts debound in N2, sintered densities were almost independent of the debinding temperature. The sinterability of the compacts debound in N2 was inferior to that debound in air.
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Seerane, Mandy, Hilda Chikwanda, Walter Focke, and Ronald Machaka. "A Study of Solvent Debinding Variables on Ti6Al4V Green Bodies." Advanced Materials Research 1019 (October 2014): 204–9. http://dx.doi.org/10.4028/www.scientific.net/amr.1019.204.

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Debinding is one of the most critical and time consuming stage in metal injection moulding (MIM). German and Bose (1997) reported that early debinding practice relied on thermal binder degradation, requiring up to 300 hours for complete binder removal. Today multi-stage debinding techniques are introduced cutting down the debinding time to as little as 2 hours. This work investigates solvent debinding variables prior to thermal debinding. Solvent debinding is carried out in n-heptane. Wax and stearic acid are the target binder components being leached out from the green bodies, with wax as the major constituent in the binder formulation. Debinding is conducted at 50, 55, 60 and 65°C for 1-4 hours at each temperature. Weight loss measurements were done. For porosity and surface appearance, scanning electron microscope (SEM) analysis and visual inspection were done. Samples de-bound at 65°C showed an appreciable amount of mass loss; however, surface cracks and warping were observed. A 60°C temperature and time of 4 hours demonstrated best results i.e. a satisfactory mass loss, absence of surface cracks and no warping. Mass loss is directly proportional to temperature and time. SEM results are discussed in the paper.
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Xie, Zhi Peng, Lin Lin Wang, and Xian Feng Yang. "Study of Water-Debinding for Ceramic Parts by Injection Molding." Materials Science Forum 561-565 (October 2007): 507–10. http://dx.doi.org/10.4028/www.scientific.net/msf.561-565.507.

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Water debinding is a new technique for ceramic injection molding. Compared with conventional thermal debinding, water-debinding has many advantages, such as environment friendly, high debinding rate, and suitable for molding large sized ceramic part. In this paper, binder system, based on polyethylene glycol(PEG) and polyvinyl butyryl(PVB), was mixed with 3Y-TZP(ZrO2) powder, and feedstock with 54vol% of ceramic powders was obtained. Shear viscosity of the feedstock was 300Pa·s at 190oC, when shear rate was 100/s, similar to the feedstock based on paraffin wax(PW). SEM showed that the feedstock and sintered parts were both homogeneous. Water debinding dynamics was also studied. For the 5mm x 6mm x 42mm sample, 65% of PEG could be extracted within 2 hours in water at 40oC, and the bending strength of sintered compacts was above 900MPa. The samples with thickness from 9mm to 12mm were made and the green parts could be debinded in water without any defects. The results showed water debinding method could increase the debinding rate and was effective to fabricate large sized ceramic parts.
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Liu, Lin, Yu Chen, Xin Lei Ni, Hai Qin Yin, and Xuan Hui Qu. "Investigation of Deibinding and Sintering of 3Y-ZrO2 Gear Fabricated by Micro Powder Injection Molding." Materials Science Forum 749 (March 2013): 378–86. http://dx.doi.org/10.4028/www.scientific.net/msf.749.378.

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The rapid development of micro-system and its related products has caused an upsurge of micro components, and the micro powder injection molding is potential for its mass production. In this work, the solvent debinding mechanism of the in-house feedstock was studied. The influence of solvent debinding, thermal debinding and sintering on the micro gears was investigated. The weight loss of 3Y-ZrO2 micro gears ranging from 200 to 900μm were compared by using six types of solvent including ether mixture withanhydrous alcohol, petroleum ether, chloroform and are hexane etc. The thermal debinding scheme was determined based on the DSC and TGA results of the binder system. The effect of the heating rate on the micro gears was investigated. The experimental results showed that the petroleum ether mixture with anhydrous alcohol yielded the best debinding effect for the micro gears, which was controlled by diffusion and dissolution. Using the established debinding and sintering schedule, the defect free micro gears were successfully fabricated.
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Yan, Ming Shuang, Wei Hao Xiong, and Chou Fan. "Study on Solvent Debinding Process of Powder Injection Molded Ti(C, N)-Based Cermets." Key Engineering Materials 353-358 (September 2007): 1410–13. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.1410.

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The solvent debinding processes of wax-based binders in powder injection molded Ti(C,N)-based cermets were studied. Effects of debinding temperature, debinding time, sample thickness, solvent types and solvent concentration on binder removal were investigated. Also, the dimension change of samples during the solvent debinding process was studied. It can be found that upwards of 70% paraffin waxes were removed and open pore channels were formed basically when the samples were immersed in heptane for 6 h at 50 °C.
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Dissertations / Theses on the topic "Debinding"

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Somasundram, Ian Mark. "Wick debinding of ceramic parts." Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.611586.

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Sachanandani, Rajiv M. Lombardo Stephen. "Failure analysis of green ceramic bodies during thermal debinding." Diss., Columbia, Mo. : University of Missouri--Columbia, 2009. http://hdl.handle.net/10355/6491.

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Title from PDF of title page (University of Missouri--Columbia, viewed on Feb 18, 2010). The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. Thesis advisor: Dr. Stephen Lombardo. Includes bibliographical references.
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Schaper, Johannes Geronimo [Verfasser]. "Magnesium Polyolefin Interactions during Thermal Debinding in the MIM Process of Magnesium / Johannes Geronimo Schaper." Kiel : Universitätsbibliothek Kiel, 2019. http://d-nb.info/1196621853/34.

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Mamen, Belgacem. "Experimental investigation and numerical simulation of thermal debinding and sintering processes in powder injection moulding." Thesis, Besançon, 2013. http://www.theses.fr/2013BESA2033/document.

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L'étape de déliantage est une étape importante et parfois critique pour le procédé Moulage par Injection des Poudres. A cet effet, des analyses thermogravimétriques (TGA) ont été réalisées pour bien comprendre les mécanismes du déliantage thermique sous atmosphère imposée (Argon). Les méthodes de Kissinger et Ozawa ont été utilisées, en se basant sur les résultats des analyses thermogravimétriques, afin d’estimer les paramètres cinétiques nécessaires pour la simulation numérique, notre modèle se propose de décrire les phénomènes physiques liés à la dégradation du polymère, le transfert de chaleur de la déformation du composant pendant le déliantage thermique.La deuxième partie de la thèse est dédiée à la compréhension des mécanismes et du comportement du fritage des composants en tungstène sous une atmosphère d’hydrogène jusqu’à une température de 1 700°C. Des appareils expérimentaux, ont été mis en place afin de constituer une base de données physiques nécessaire pour l’identification des différents paramètres. L’identification de l’ensemble des lois de comportement a été réalisée en prenant en compte les spécificités physiques des poudres utilisées. Un modèle de comportement de type thermo élasto-viscoplastique est formulé pour représenter la loi de densification par diffusion solide, puis appliqué pour les différentes tailles de poudres de tungstène. La dernière étape consiste à valider des simulations numériques avec ABAQUS pour une meilleure détermination des densités et des retraits finaux des composants injectés<br>Thermal debinding is one of the most important steps In Powder Injection Moulding process. Thermogravimetric analyses (TGA) are employed to analyze the physics and kinetics of thermal debinding behaviour under argon atmosphere. The Kissinger and Ozawa method have been used to estimate the kinetic parameters from thermogravimetric experiments. To set up the numerical simulations of thermal debinding stage using finite element method, a coupled mathematical has been developed. The basic steps of the proposed model consist to solve the following sequences of coupled problems: themal degradation of binder coupled with heat transfer and deformation phenomena by finite element method using Comsol Multiphysics software.In the second part of this thesis, sintering behaviour of tungsten powders injection moulded component, under pure hydrogen atmosphere at temperature up to 1700°C. The experimental tests are used to determine the material parameters in the parameters in the viscoplastic constitutive law, which is incorporated with the identified parameters in order to simulate the final shrinkages and densities of tungsten injection moulded components during the sintering process. Comparison between the numerical simulations results and experimental ones, in term of shrinkages and sintered densities, shows a good agreement
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Luna, Wilberth Harold Deza. "Estudos para obtenção da liga NiTi pelo processo de moldagem de pós por injeção." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2008. http://hdl.handle.net/10183/108473.

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Os avanços da moldagem de pós por injeção – MPI – associados às excelentes propriedades da liga NiTi abrem novas possibilidades em diferentes áreas da engenharia. A MPI é um processo de fabricação que facilita a elaboração de diversos componentes, podendo-se obter peças de geometrias complexas a um menor custo. O NiTi ou Nitinol® é uma liga que pertence ao grupo dos chamados materiais inteligentes, por ter propriedades como memória de forma e superelasticidade, além disso, essa liga é um material biotolerante por ter titânio na sua composição. O objetivo deste trabalho é estabelecer os parâmetros para a produção de Nitinol® pelo processo MPI visando à confecção de implantes de fixação óssea. Assim, com o objetivo de melhorar o desempenho do processo MPI, este estudo utiliza diferentes cargas injetáveis (feedstock), modificando quantidades de pó na carga injetável e também modificando cada um dos componentes do ligante (binder), de modo a determinar aquela que permite a melhor extração do polímero, corrigindo assim uma das principais fontes de contaminação. A extração química e térmica do ligante é uma etapa também estudada na pesquisa, nessa etapa é analisada a influência da morfologia dos pós na contaminação final das amostras, já que a quantidade de polímero restante após a extração do ligante reagirá diretamente com a matéria prima (Ni – Ti). São estabelecidos ciclos de temperatura para a sinterização da liga.<br>Advances in Powder Injection Molding (PIM), allied to the great properties of NiTi alloy, offer new possibilities on different areas of engineering. MIP is a process that makes the factory of many compounds easier, allowing to make pieces with complex geometry in minor cost. NiTi or Nitinol® is an alloy that belongs to the “smart materials”, because it has properties as shape memory and superelasticity. Besides, this alloy has good biotollerance because of the titanium. This research means to establish parameters to the production of Nitinol® by PIM process, for bone implants. Therefore, to improve the PIM process, this study applies different feedstock, changing amounts of powder of the injection and also changing each of the components of the binder, in order to determine which one allows the best extraction of the polymer correcting one of prime sources of contamination. Chemical and thermal extraction of the binder was also studied on this research, analyzing the influence of the morphology of the powder on the final contamination of the samples, since the polymer that was left after the binder extraction will react directly with the prime material (Ni-Ti). Temperature cycles are established to the sintering of the alloy.
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Abid, Marwa. "Développement d'une formulation céramique partiellement biosourcée pour la FA." Electronic Thesis or Diss., Ecole nationale supérieure Mines-Télécom Lille Douai, 2023. http://www.theses.fr/2023MTLD0003.

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Un nouveau feedstock à base de polymères biosourcés et de zircone a été élaboré en vue de son utilisation pour la fabrication de pièces techniques en céramique frittée par un procédé CIM-like (Ceramic Injection Molding-like) plus respectueux de l’environnement (formulation partiellement biosourcée, absence de solvant et impression à basse température). En parallèle, un autre feedstock à base de polypropylène (PP) a été élaboré et utilisé comme référence. Chacune des étapes du procédé a été optimisée compte tenu des équipements à disposition. Les mécanismes mis en jeu ont été identifiés et les obstacles afférents ont été progressivement surmontés. Finalement des performances mécaniques satisfaisantes ont été obtenues sur les pièces frittées et permettent d’envisager raisonnablement une industrialisation et une commercialisation de feedstock développé<br>A new feedstock based on biobased polymers and zirconia was developed for use in the production of technical ceramic parts using a more environmentally friendly CIM-like (Ceramic Injection Molding-like) process (partially biobased formulation, solvent-free and low-temperature printing). In parallel, another feedstock based on polypropylene (PP) was developed and used as a reference. Each step of the process was optimized based on the available equipment. The mechanisms involved were identified and the associated obstacles were gradually overcome. Finally, satisfactory mechanical performance was achieved on the sintered parts, making it reasonable to consider patenting and commercializing the feedstock developed
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Agne, Aboubakry. "Modélisation et simulation numérique des étapes de déliantage et frittage du procédé de Moulage par Injection de poudres Métalliques (MIM)." Thesis, Bourgogne Franche-Comté, 2019. http://www.theses.fr/2019UBFCD025.

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Les étapes de déliantage et de frittage sont des phases cruciales du procédé de Moulage par Injection de poudres Métalliques (MIM). Elles sont généralement à l’origine des principales variations dimensionnelles. Pour quantifier et prédire les pertes de masse et déformations associées à ces séquences, différents modèles, inspirés de la littérature, décrivant au mieux les mécanismes de chaque étape, ont été proposés. Ils sont appliqués à une formulation industrielle à base de poudres de superalliage à base de nickel (Inconel 718) et d’un liant multi-ingrédients. La formulation a été caractérisée par des analyses thermiques et gravimétriques. L’objectif de ces travaux a été, dans un premier temps, de prédire les quantités de matière éliminées pendant les déliantages solvant et thermique, et de suivre l’évolution des dimensions grâce à la simulation numérique par la méthode des éléments-finis dans la plateforme Comsol Multiphysics ®. Dans un second temps, les travaux se sont focalisés sur la modélisation de la déformation et l’évolution de la densité relative pendant le frittage conventionnel en phase solide. La perte de masse pendant le déliantage aqueux a été modélisée par une expression analytique pilotée par un paramètre de diffusion obtenu expérimentalement. Elle a été associée au gonflement hygroscopique et à la dilation thermique qui sont les principales sources de déformation du déliantage solvant. Le déliantage par CO2 supercritique, qui est une méthode innovante d’extraction du polyéthylène glycol (PEG), a fait l’objet d’une caractérisation expérimentale et de simulations numériques rendant possible la prédiction de la perte de masse en PEG sur Comsol Multiphysics ® de composants développés au sein du laboratoire. La cinétique de dégradation pendant le déliantage thermique a été décrite expérimentalement avec des analyses thermogravimétriques réalisées sur des échantillons à base du feedstock industriel. Les méthodes d’Ozawa et de Kissinger ont permis d’estimer les énergies d’activation de la cinétique de dégradation de l’ensemble des constituants pour la simulation numérique. Le couplage entre la dégradation et le transfert de chaleur a rendu possible la simulation complète de cette étape avec pour objectif de prédire la distribution géométrique et temporelle du liant et les déformations générées. Le frittage en phase solide de l’Inconel 718 a fait l’objet de caractérisations expérimentales et de simulations par éléments-finis. La loi de comportement thermo-élasto-viscoplastique, permettant de quantifier la déformation totale et la densité relative tout au long de la densification, a été formulée et implémentée dans le code éléments-finis ABAQUS ®. La viscosité uni-axiale a été identifiée en utilisant une méthode de chargement de type compression par intermittence. Elle a permis par la suite d’identifier la contrainte de frittage. La pertinence de cette méthode a été discutée par comparaison avec une autre méthode basée sur la vitesse de déformation du frittage libre avec moins d’incertitudes de mesures. Les résultats de l’ensemble des développements numériques réalisés ont été confrontés à des résultats expérimentaux obtenus sur une géométrie de pièce MIM aéronautique, conduisant à une bonne estimation de la valeur des dilatations et retraits<br>The debinding and sintering steps are crucial for the Metal Injection Moulding (MIM) process. The main dimensional changes are generated from these two steps. In order to predict the mass losses and the deformation behaviours, different models fitting to the mechanical mechanisms observed were obtained from the state of art. They are adapted and performed for each step. These models used for the numerical simulation are applied to industrial components based on a formulation composed of Inconel 718 superalloy powders and a multi-ingredient binder system. The formulation is characterized by thermal and gravimetric analyses. The aim of the thesis is, at first, to predict the weight loss after the complete debinding step including the solvent and the thermal debinding, followed by the modelling of the solid state sintering of the material. The weight loss during solvent debinding is expressed by an analytic function controlled by a diffusion parameter, which is directly identified from experimental results. Hygroscopic swelling and thermal expansion are coupled to the weight loss to follow as well the expansion during the binder extraction. Supercritical debinding, an innovative way to remove by diffusion some polymers, is also investigated in order to predict the extraction of the polyethylene glycol (PEG) in in-house components by numerical simulation using the finite-element method on Comsol Multiphysics ® software. Thermogravimetric analyses were employed to characterize the kinetics during the thermal debinding of the industrial formulation. The Ozawa and Kissinger methods are introduced to estimate the activation energies of each polymer of the binder system for the numerical simulation. A coupled model is developed by using the heat transfer principle and a thermal degradation law in order to visualize the binder distribution and the shrinkage due to its elimination. Experimental and numerical studies are carried out on solid state sintering of the Inconel 718. A thermal elasto-viscoplastic law based on the continuum mechanics is adopted and built in the commercial software ABAQUS ® to simulate the shrinkage and the density field during the sintering step. The uniaxial viscosity, a main parameter of the constitutive equations, is evaluated using intermittent compression tests. The sintering stress is identified from experimental densification thanks to the viscosity and then, used for the numerical simulation. The relevance of this methodology is discussed by comparison with a different method based on the densification rate that showed a lower level of uncertainties. The numerical analysis of the debinding and the sintering steps showed in this thesis are compared with the experimental measurements performed on MIM aeronautical components
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Ikegami, Rogério Akihide. "Conformação de pó de aço inoxidável através do processo de injeção à baixa pressão." Universidade de São Paulo, 2000. http://www.teses.usp.br/teses/disponiveis/18/18135/tde-11072018-112547/.

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Metalurgia do pó é o uso de metais na forma de pó para a manufatura de produtos. Pós metálicos são combinados (misturados) e compactados em um molde. O material compactado recebe um tratamento térmico ou é sinterizado em um ambiente controlado para a união das partículas para formar um produto denso e resistente. Injeção de pós metálicos tem se destacado mundialmente na produção de componentes de pequenas dimensões e formas complexas em substituição a fundição sob pressão e a sinterização convencional. Atualmente a injeção de pós metálicos está se tornando uma opção competitiva relativamente à peças fundidas, forjadas, usinadas e estampadas. O presente trabalho revisa as técnicas de injeção de pós metálicos e aplica o processo de injeção à baixa pressão utilizando pó de aço inoxidável 316L com granulometria fina (15 &#956m). Os produtos injetados, uma vez extraídos o VO e sinterizados, foram submetidos à ensaios de tração, dureza e micrográficos. Os resultados obtidos são apresentados e discutidos. O trabalho, para a sua viabilização, incluiu a reforma de uma injetora de bancada à baixa pressão e a construção de moldes de injeção.<br>Powder metallurgy is the use of metals in the powder form for the manufacture of products. Metallic powders are combined (mixed) and compacted in a die. The compacted material receives a thermal treatment or it is sintered in an controlled atmosphere for the particle binding to form a dense and resistant product. lnjection of metallic powders has if globally highlighted in the production of components of small dimensions and complex forms in substitution the pressure casting and the conventional sintering. Nowadays the injection of metallic powders is becoming relatively a competitive option than casting, forging, machining and stamping. The present work revises the techniques of injection of metallic powders and it applies the injection process to the low pressure using powder of stainless steel 316L with fine granulation (15 &#956m). The injected products, once debinded and sintered, were submitted to tensile test, hardness and micrography. The results are presented and discussed. In this work, included the reform of a low pressure injection machine and construction of injection dies.
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Royer, Alexandre. "Etude, caractérisations et développement de mélanges de polymères biosourcés chargés de poudre d'Inconel 718 pour l'élaboration de composants et micro-composants via moulage par injection de poudres métalliques." Thesis, Besançon, 2016. http://www.theses.fr/2016BESA2058/document.

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Ces travaux de thèse concernent l’étude du comportement thermo-physique de mélanges de polymères biosourcés chargés de poudre d’Inconel 718 mis en forme par Moulage par Injection de poudre Métallique. Des matériaux et procédés innovants pouvant permettre une amélioration du procédé ont été étudiés. L’utilisation de polyéthylène glycol (PEG), choisi pour ses propriétés de solubilité dans l’eau, et de polymères biosourcés, pour diminuer l’impact environnemental, ont été choisi. Les nuances de polymères biosourcés ont été choisies adaptées aux conditions du procédé de moulage par injection, il s’agit d’acide polylactique et de polyhydroalcanoates. De même, l’utilisation du CO2 à l’état supercritique comme solvant, a pour objectif de diminuer le temps de déliantage ainsi que d’augmenter la qualité des composants réalisés. Les résultats obtenus ont montré une dégradation du PEG et de l’acide stéarique lors des cycles de mélangeage de de moulage par injection dans les conditions d’utilisation des polymères biosourcés. L’utilisation des mélanges chargés composés de polymères biosourcés ont permis d’améliorer l’homogénéité des composants injectés, mais ont engendré des défauts lors de l’étape de déliantage. Ces défauts ont pu être éliminés par l’utilisation de CO2 à l’état supercritique comme solvant du PEG. Ce dernier procédé a permis une diminution importante du temps de déliantage ainsi qu’une amélioration de la qualité des composants finaux. Les composants densifiés possèdent les propriétés mécaniques correspondantes à l’Inconel 718<br>The works done during this PhD focuses on the study of the thermo-physical behavior of bio sourced polymer blends loaded with Inconel 718 powder (feedstock) to be shaped by the Metal Injection Molding process (MIM). First, a review of the researches related to the MIM process was conducted to identify innovative materials and processes that can improve the MIM process. Thus, the use of polyethylene glycol (PEG), selected for its properties of solubility in water, and bio sourced polymers, in order to reduce the environmental impact, were selected. The bio sourced polymers have been selected in accordance with the conditions of the injection molding process, and the choice was made to use polylactic acid (PLA) and polyhydroalkanoates (PHA and PHBV). Similarly, the supercritical CO2 as solvent was chosen to reduce the time of binder removal as well as increasing the quality of components produced. Thermo-physical, mechanical and rheological characterizations were made to determine the behavior of the different feedstock formulations. The results showed a degradation of the PEG and of the stearic acid under the conditions of use of the biopolymers, during the mixing and the injection stages. The use of feedstock made of bio sourced polymers have improved the homogeneity of the injected components, but they have generated defects during the debinding step. These defects have been eliminated by the use of CO2 in the supercritical state as solvent of the PEG. This method has significantly decrease the time of binder removal and improved the quality of the final components. Finally, densified components have the mechanical properties corresponding to Inconel 718
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Dugauguez, Olivier. "Application of unconventional methods on lnconel 718 MIM components." Thesis, Bourgogne Franche-Comté, 2017. http://www.theses.fr/2017UBFCD045.

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Le procédé de moulage par injection de poudres métalliques (MIM) permet la réalisation de composants métalliques de formes complexes. Il permet la fabrication de moyenne ou grande série via la combinaison de l’injection thermoplastique avec la métallurgie des poudres. Le procédé MIM est un procédé multi-étape qui commence par l’élaboration d’un feedstock, qui est obtenu par mélange de différents polymères avec une poudre métallique. Il est ensuite injecté à l’intérieur d’un moule afin de lui donner la forme désirée. Afin de pouvoir obtenir une pièce métallique dense, les polymères sont progressivement éliminés soit via l’utilisation d’un solvant, soit par dégradation thermique. La pièce est ensuite densifiée grâce à l’application d’un traitement thermique adapté au matériau. Les travaux de cette thèse ont étés initiés par le projet FUI ProPIM, qui réunit différents partenaires industriels et laboratoires de recherche régionaux autour de la fabrication de pièces en superalliage base nickel chrome. Le procédé conventionnel MIM nécessite des cycles gourmands en temps et en énergie lors des étapes de déliantages et de frittages. Ces travaux présentent la recherche de nouvelles méthodes afin d’accélérer ces étapes tout en conservant les propriétés de base du matériau. La recherche de la maitrise de ces étapes est présentée ainsi que les effets de ces nouvelles méthodes sur les propriétés des composants obtenus. Une alternative à l’utilisation de solvants pour extraire les polymères du feedstock a été récemment mise en avant via l’utilisation de fluides à l’état supercritique. La recherche de compatibilité avec les feedstocks dans le cadre du projet ainsi que l’optimisation des paramètres permettant les meilleures conditions d’extraction sont présentées. Le traitement thermique des poudres métalliques pour obtenir un composant dense nécessite l’utilisation de fours pendant des cycles de plusieurs heures. Deux méthodes de frittage dites « non-conventionnelles » ont étés sélectionnées pour leur capacité à réaliser la densification rapidement. La première est le Field Assisted Hot pressing qui combine l’application de pression à l’utilisation de courant électrique pour réaliser le frittage. La deuxième consiste à appliquer des micro-ondes. L’application des méthodes et l’optimisation des cycles de frittage sont présentées ainsi que les effets sur la microstructure des composants métalliques obtenus, ainsi que sur les performances mécaniques<br>The metallic powder injection moulding process is used for the elaboration of complex shape metallic components. It is efficient for mass production for medium to large series via the combination of thermoplastic injection with powder metallurgy. The MIM process is a multi-step method starting with the elaboration of a feedstock, obtained by mixing different polymers with a metallic powder. It is injected into a die cavity mould to obtain the deigned shape. In order to obtain a dense metallic component, the polymers are progressively extracted by either solvent or thermal debinding. The densification of the component by applying a thermal treatment adapted to the material. This PhD work was initiated by the project FUI ProPIM gathering different industrials and research laboratories around the elaboration nickel-chrome superalloys components. The conventional MIM process has to be performed with time and energy consuming treatment cycles during debinding and sintering. The goal of this work presents new methods developed to accelerate these treatments while at least keeping the same properties of the material. The research presents the optimization of these methods as well as the effects on the properties of the components. The first is an alternative to the organic solvent debinding used to extract polymers of the MIM feedstock. It is replaced by a fluid in a supercritical state. The study of the compatibility and of the performance of the method on the feedstocks is the main concern. The optimization of the debinding parameters and the effects on the final quality of the product is presented. Then, the sintering and the thermal treatment of the metallic powders needs furnaces with controlled atmospheres for extensive periods of time. Two unconventional sintering methods were selected for their capacity to perform the thermal treatments at a high heating rate. The first method is the Field Assisted Hot pressing which combines the application of a pressure with a high intensity current to rise the temperature. The second is the irradiation of the powder by microwaves. The two methods have to be adjusted to the MIM components. The development of the two methods and the effect on the microstructure and the mechanical performances of the material are investigated
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Book chapters on the topic "Debinding"

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Rahaman, M. N. "The Process of Thermal Debinding." In Inorganic Reactions and Methods. John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470145333.ch21.

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Ter Maat, J. H. H., J. Ebenhöch, and H. J. Sterzel. "Fast Catalytic Debinding of Injection Moulded Parts." In 4th International Symposium on Ceramic Materials and Components for Engines. Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2882-7_58.

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Xie, Zhi Peng, Lin Lin Wang, Xian Feng Yang, and Zhen Ting Zhang. "Water Debinding for Zirconia Powder Injection Molding." In High-Performance Ceramics V. Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/0-87849-473-1.732.

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Dai, Chun Lei, Jin Long Yang, and Yong Huang. "Pretreatment Processing of Gelcast Green Body before Debinding." In Materials Science Forum. Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-960-1.1321.

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Veronesi, P., C. Leonelli, G. Poli, L. Denti, and A. Gatto. "Microwave Rapid Debinding and Sintering of MIM/CIM Parts." In Ceramic Transactions Series. John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470599730.ch26.

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Klimera, Andreas, Friedrich Raether, and P. Schulze Horn. "In Situ Investigation of Debinding of Non-Oxide Ceramic." In Advances in Science and Technology. Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/3-908158-01-x.1684.

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Machado, Ricardo, Waldyr Ristow, P. R. Alba, Aloísio Nelmo Klein, Paulo A. P. Wendhausen, and D. Fusão. "Plasma Assisted Debinding and Sintering (PADS) – Metal Injection Molding Application." In Materials Science Forum. Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-423-5.224.

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Xie, Zhi Peng, Lin Lin Wang, and Xian Feng Yang. "Study of Water-Debinding for Ceramic Parts by Injection Molding." In Materials Science Forum. Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-462-6.507.

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Clemens, Frank, Josef Schulz, Lovro Gorjan, Antje Liersch, Tutu Sebastian, and Fateme Sarraf. "Debinding and Sintering of Dense Ceramic Structures Made with Fused Deposition Modeling." In Industrializing Additive Manufacturing. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-54334-1_21.

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Rosa, Roberto, Paolo Veronesi, and Cristina Leonelli. "Optimization of Microwave-Assisted Rapid Debinding of CIM Parts in Multi-Mode Applicators." In Advanced Processing and Manufacturing Technologies for Structural and Multifunctional Materials III. John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470584392.ch4.

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Conference papers on the topic "Debinding"

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Omar, M. A., I. Subuki, Mohamad Rusop, Rihanum Yahaya Subban, Norlida Kamarulzaman, and Wong Tin Wui. "Microstructure Evolution During Rapid Debinding of MIM Compact." In INTERNATIONAL CONFERENCE ON ADVANCEMENT OF MATERIALS AND NANOTECHNOLOGY: (ICAMN—2007). AIP, 2010. http://dx.doi.org/10.1063/1.3377871.

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Zissel, Kai, Elena Bernardo Quejido, Sankhya Bhattacharya, Pierre Forêt, and Eduard Hryha. "Key Aspects Of The Debinding & Sintering Atmosphere For 17-4 PH Stainless Steel Fabricated Via Binder Jetting." In Euro Powder Metallurgy 2023 Congress & Exhibition. EPMA, 2023. http://dx.doi.org/10.59499/ep235761118.

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Binder Jetting (BJT) of metals is a multi-step process that relies on the sintering of printed parts to reach the intended material properties. A crucial but often overlooked step after printing is debinding, which is impacted by the processing atmosphere and strongly determines the efficiency of the following sintering process. A tailored processing atmosphere composition and flow can facilitate removal and decomposition of the binder as well as efficient removal of the decomposition products. The success of debinding and sintering is closely correlated, and both require a specific but often different processing atmosphere in terms of purity and composition in order to achieve the required material properties and tolerances of the sintered component. In this study, different atmospheres for the debinding and sintering of 17 4 PH stainless steel manufactured via BJT were studied utilizing chemical analysis and microstructural examination to determine the effectiveness of the debinding and sintering processes.
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Kukla, C., V. Momeni, S. Schuschnigg, and C. Holzer. "Polylactic Acid (PLA) as Backbone for the Fused Filament Fabrication (FFF) of Aluminium." In Euro Powder Metallurgy 2024 Congress & Exhibition. EPMA, 2024. http://dx.doi.org/10.59499/ep246281505.

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The backbone plays a significant role in the binder system for FFF of metals. Since the backbone is degraded thermally, the temperature for this debinding step should be below the sintering temperature of the involved metal. Thus, the low degradation temperature makes PLA a proper candidate for the backbone in feedstocks for aluminium with a relatively low sintering temperature starting at about 550 °C. However, processing of PLA is challenging due to high shear and temperature sensitivity. Therefore, the printability at different nozzle temperatures (230, 250, 270 °C) was investigated for various formulations with PLA content ranging from 25 to 40 vol.% in the binder system. Solvent debinding for printed samples was conducted at room temperature and different immersion times. The results indicated the substantial impact of printing temperature on enhancing shape retention and preventing interlayer cracking during the solvent debinding process. The main binder was removed successfully without any defects during solvent debinding.
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Poehle, G., P. Quadbeck, S. Riecker, C. Kukla, V. Momeni, and S. Schuschnigg. "Debinding And Sintering Strategies For Fused Filament Fabrication Of Aluminium Alloys." In Euro Powder Metallurgy 2023 Congress & Exhibition. EPMA, 2023. http://dx.doi.org/10.59499/ep235764658.

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Fused Filament Fabrication (FFF) is a widespread additive manufacturing technology, mostly in the field of printable polymers. The use of filaments filled with metal particles for the manufacture of metallic parts by FFF presents specific challenges regarding debinding and sintering. For aluminium and its alloys, the sintering temperature range overlaps with the temperature range of thermal decomposition of many commonly used “backbone” polymers, which provide stability to the green parts. Moreover, the high oxygen affinity of aluminium necessitates the use of special sintering regimes and alloying strategies. Therefore, it is challenging to achieve both low porosity and low levels of oxygen and carbon impurities at the same time. Feedstocks compatible with the special requirements of aluminium alloys were developed. We present results on the investigation of debinding/sintering regimes by Fourier Transform Infrared spectroscopy (FTIR) based In-Situ Process Gas Analysis and discuss optimized thermal treatment strategies for Al-based FFF.
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Studnitzky, Thomas, Thomas Weißgärber, Kay Reuter, et al. "Stereolithography Of Copper For 5G, 6G And Beyond." In World Powder Metallurgy 2022 Congress & Exhibition. EPMA, 2022. http://dx.doi.org/10.59499/wp225371976.

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New mobile communication standards such as 5G, 6G and beyond require further miniaturisation of complex components such as waveguides or filters made of pure copper. Previous manufacturing methods for 3D components have reached their limits in terms of precision and productivity. As a new sinter-based additive process, lithography-based metal manufacturing (LMM) enables the economical and high-precision production of such components with structure widths of around 100 µm. Since only steels have been available in LMM so far, the material copper was developed for LMM for the first time in this work. The entire process chain from powder selection, paste formulation and printing process parameters to debinding and sintering was investigated. Special emphasis was focused on the achievable geometries and the material properties in order to achieve high purity, excellent debindering quality and maximum sintering density .
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KASHIMBETOVA, Adelia, Serhii TKACHENKO, Karel SLÁMEČKA, et al. "Extrusion, Debinding and sintering of a commercial pure titanium ink for robocasting." In METAL 2021. TANGER Ltd., 2021. http://dx.doi.org/10.37904/metal.2021.4263.

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Kukla, C., V. Momeni, G. Poehle, S. Riecker, and S. Schuschnigg. "Filament Development for Metallic Fused Filament Fabrication of Aluminium Alloys." In Euro Powder Metallurgy 2023 Congress & Exhibition. EPMA, 2023. http://dx.doi.org/10.59499/ep235763812.

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Material Extrusion with filaments, Fused Filament Fabrication – FFF, is the most widespread additive manufacturing technology. This counts mainly for polymers, since the use of this technology for metal and ceramic powders is still in its early days. For several metals, filaments can be bought in the market. Aluminium has a low sintering temperature already in the range of the temperatures for thermal debinding of many feedstocks and needs special sintering regimes. To meet these special requirements, a feedstock for the production of highly filled aluminium filaments was developed. The printed parts are debinded by solvents. Here, the following results are presented: 1) rheological behaviour of the feedstock, 2) debinding behaviour with emphasis on the selection of solvents and 3) printing performance.
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Lacorne, Jordan, Eric Maire, Aurélien Etiemble, Xavier Boulnat, Romain Faye, and Sandra Simon. "3D Printing Of H13 Tool Steel Filaments : Influence Of Debinding|sintering Atmosphere On The Microstructure And The Mechanical Properties Of Sintered Parts." In World Powder Metallurgy 2022 Congress & Exhibition. EPMA, 2022. http://dx.doi.org/10.59499/wp225371420.

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Additive Manufacturing is a growing sector in industrial production. Fused Filament Fabrication (FFF) technology is developing by using new materials such as filaments incorporating metal powder (40 to 60%vol) and thermoplastic binders. After 3D printing, FFF needs two more steps: debinding, where the binder is removed, and sintering, where the porous part is densified. The nature of the protective atmosphere is critical because it influences the binder removal and also the sintering|oxidation behavior of the metal powders. This work aims to study the influence of atmosphere (gas type and flow rate) during debinding and sintering on the properties of the final parts in work tool steel (AISI H13). The link between atmosphere and carbon|oxygen uptakes, porosity, microstructure, and mechanical properties will be described.
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Etiemble, Aurelien, Thierry Commeau, Aurélie Nouveau, Sandra Simon, and Claire Rigollet. "Development And Characterization Of W-based Feedstock For Extrusion-based Additive Manufacturing." In World Powder Metallurgy 2022 Congress & Exhibition. EPMA, 2022. http://dx.doi.org/10.59499/wp225371433.

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The applicability and expansion of the promising opportunities offered by extrusion-based technologies for the additive manufacture of metal parts (FFF, FDM or PIM-like) depends on the development of new feedstock for specialty powders. In this context, W-based feedstock was developed and characterized in this study. For these indirect processes, the feedstock is firstly extruded to form a wire and is then deposited to shape the part. Debinding and sintering operations are finally required to obtain the finished metal part. The feedstock formulation was optimized to allow and then to enhance the processability at all these steps. The printability of W-based feedstocks is demonstrated and a critical powder content, required to guarantee the efficient debinding and sintering, is established. Microstructure and mechanical properties (hardness) of sintered parts were characterized and compared to conventionally manufactured parts.
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Huang, Shuigen, Eric Wong, Berfu Göksel, Jun Qian, and Jozef Vleugels. "Direct Ink Writing Of Open And Dense NbC-Ni Matrix Cermet Structures." In World Powder Metallurgy 2022 Congress & Exhibition. EPMA, 2022. http://dx.doi.org/10.59499/wp225368559.

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Direct Ink Writing (DIW), also known as robocasting, is a paste extrusion-based layer-by-layer additive manufacturing technique suitable for manufacturing complex geometry green compacts. In this study, NbC-Ni matrix cermets with either a porous scaffold structure or a pore-free rectangular bar geometry were prepared using a combination of DIW and sintering. The water based feedstock ink contained 40 vol% cermet powder mixture and 25 wt% pluronic F-127 hydrogel. The ink was rheologically characterized and printed using a DIW device. Thermogravimetric analysis (TGA) of the paste was performed to define the thermal debinding cycle. After debinding, the printed parts were sintered for 90 min at 1420 °C in vacuum. The microstructure and room temperature hardness of the printed parts were investigated and compared with cermets obtained by conventional press and sinter powder metallurgy.
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