Gotowe bibliografie tematyczne / Cold-bonding

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Gotowa bibliografia na temat „Cold-bonding”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 1 lutego 2022

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Artykuły w czasopismach na temat "Cold-bonding"

Cui, Guo Ming, Xing Xia Li i Jian Min Zeng. "Research on Cold-Rolled Bimetal of High-Tin Aluminum Alloy and Steel". Applied Mechanics and Materials 217-219 (listopad 2012): 395–99. http://dx.doi.org/10.4028/www.scientific.net/amm.217-219.395.

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Bimetal of high-tin aluminum alloy and steel was fabricated by cold-rolling process; microstructure, bonding strength and bonding mechanism for bonding interface of the bimetal were investigated under cold-rolling and recrystallization annealing state, respectively. Experimental results indicate that tin phase of bimetal in cold-rolling state shows a belt type distribution, however, it, in recrystallization annealing state, is uniformly distributed just like some “isolated islands”. A well bonding interface, between layers of high–tin aluminum alloy and pure aluminum, can be obtained, and it is difficult to distinguish one layer from the other; but the interface, between layers of low-carbon steel back and pure aluminum, is clear and uneven. And meanwhile, bonding mechanism of bimetal interface, in cold-rolling state, is cold pressure welding and mechanical occluding, But it, in recrystallization annealing state, is cold pressure welding, mechanical occluding, and metallurgic bonding. After recrystallization annealing, at 350°C for 2h,the bonding strength of bimetal approaches to 92.4MPa, which is about 26% higher than that of cold-rolling state.

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Liu, Fangming, Wei Ding, Jin Liu i Duanwei He. "Cold bonding of alumina: Fractured and re-bonding under compression". Journal of the European Ceramic Society 40, nr 1 (styczeń 2020): 192–96. http://dx.doi.org/10.1016/j.jeurceramsoc.2019.09.021.

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Bay, N., C. Clemensen, O. Juelstorp i T. Wanheim. "Bond Strength in Cold Roll Bonding". CIRP Annals 34, nr 1 (1985): 221–24. http://dx.doi.org/10.1016/s0007-8506(07)61760-0.

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Assadi, Hamid, Frank Gärtner, Thorsten Stoltenhoff i Heinrich Kreye. "Bonding mechanism in cold gas spraying". Acta Materialia 51, nr 15 (wrzesień 2003): 4379–94. http://dx.doi.org/10.1016/s1359-6454(03)00274-x.

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Jamaati, R., i M. R. Toroghinejad. "Cold roll bonding bond strengths: review". Materials Science and Technology 27, nr 7 (lipiec 2011): 1101–8. http://dx.doi.org/10.1179/026708310x12815992418256.

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Sim, K. S., i Yong Sin Lee. "A Bonding Map for Cu and Al Plates by Pressure Welding at Cold and Warm Temperatures". Materials Science Forum 475-479 (styczeń 2005): 2667–70. http://dx.doi.org/10.4028/www.scientific.net/msf.475-479.2667.

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This paper is concerned with pressure welding, which has been known as a main bonding mechanism during the cold and warm formings such as clad extrusion or bundle extrusion/drawing. Bonding characteristics between the Cu and Al plates by pressure welding are investigated focusing on the weak bonding. Experiments are performed at the cold and warm temperatures ranging from the room temperature to 200°C. The important factors examined in this work are the welding pressure, pressure holding time, surface roughness, and temperature. A bonding map, which can identify the bonding criterion with a weak bonding strength of 1MPa , is proposed in terms of welding pressure and surface roughness for the cold and warm temperature ranges.

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S, Kumar, Naveen M Chavan i Srinivasa Rao D. "Cold spraying: A low temperature variant of thermal spray techniques to deposit metallic materials". Frontiers in Advanced Materials Research 1, nr 1 (30.05.2019): 25–27. http://dx.doi.org/10.34256/famr1914.

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Cold spraying is a novel material deposition process in which micron size particles are accelerated to supersonic velocity on to a metallic substrate to obtain thick and dense coatings. Unlike other thermal spray coatings, the bonding mechanism is completely different. In conventional thermal spray techniques, melting and solidification upon impact dominates the bonding mechanism. In cold spraying, Plastic deformation induced adiabatic shear instability governs the bonding process in which adiabatic temperature rise, plastic strain at interface and flow stress collapse play a crucial role. Variety of material including pure metals, alloys, composites and cermets have been deposited using cold spraying for variety of applications. In this article, a brief introduction about the bonding mechanism and potential applications of cold spraying is being discussed.

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Liu, Wei, Jing Fu, Haiping Zhang, Yuanyuan Shao, Hui Zhang i Jesse Zhu. "Cold Bonding Method for Metallic Powder Coatings". Materials 11, nr 11 (25.10.2018): 2086. http://dx.doi.org/10.3390/ma11112086.

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An efficient and simple method for preparing bonded metallic powder coating is in high demand in the paint manufacturing and application industries. The bonding purpose is to keep the mass percentage of metallic pigment consistent between the original and recycled coating powder, which aims at solving the problem of recyclability. One possible method capable of realizing this goal is using the binder to cohere metallic pigment with base particles through a cold bonding method. Through this approach, the pre-curing and high-reject-rate problems generally present in thermal bonding can be completely eliminated. In this paper, polyacrylic acid (PAA) and polyvinyl alcohol (PVA) are applied as binders for the bonding process. At various dosages of liquid binder and D.I. water, bonded samples with different bonding effect were prepared. Finally, a good bonding quality with the lowest variance between the mass concentrations of Al flakes in the original powder (before spray) and deposited powder (after spray) 2.94% with PAA as a binder and 0.46% with PVA as a binder was achieved. These results manifest that the cold bonding method is a green and simple approach for preparing the metallic powder coating.

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Madaah-Hosseini, H. R., i A. H. Kokabi. "Cold roll bonding of 5754-aluminum strips". Materials Science and Engineering: A 335, nr 1-2 (wrzesień 2002): 186–90. http://dx.doi.org/10.1016/s0921-5093(01)01925-6.

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Li, Long, Kotobu Nagai i Fuxing Yin. "Progress in cold roll bonding of metals". Science and Technology of Advanced Materials 9, nr 2 (kwiecień 2008): 023001. http://dx.doi.org/10.1088/1468-6996/9/2/023001.

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Rozprawy doktorskie na temat "Cold-bonding"

Thomas, B. A., J. S. Wilson i K. Gagnon. "Solid 100Mo target preparation using cold rolling and diffusion bonding". Helmholtz-Zentrum Dresden - Rossendorf, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-166307.

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Introduction 100Mo target design is key to commercially viable large scale cyclotron production of 99mTc. The target back plate supporting the 100Mo must be chemically inert to the target dissolution conditions but ideally it should also be able to dissipate the high thermal loads of irradiation, not contaminate target substrate with radionuclidic by-products, and be adequately inexpensive to allow for single use. Aluminum was selected as our target support as it satisfies these requirements. Our process entails rolling 100Mo powder into a foil of desired thickness, and then diffusion bonding [1] the foil onto an aluminum back plate. The 100Mo targets were designed to be 20×80×0.1 mm to match our TR24 cyclotron’s proton beam profile and energy. Efforts are currently underway to scale up the process to allow for simultaneous production of multiple targets at once. Material and Methods The crude enriched 100Mo foil (99.815% enrichment) was made from 100Mo powder using a horizontally mounted rolling mill and an aluminum hopper. The crude foil was rolled repeated-ly, and the space between the rollers gradually reduced until the thickness of the foil was changed from an initial thickness of 0.3 mm to a thickness of 0.1 mm. The rolled 100Mo foil was annealed under reducing atmosphere and then bonded to the aluminum target plate support under inert atmosphere in a heated press at 500 °C. Results and Conclusion By rolling 100Mo foils from powder we were able to produce uniform foils with an average density of > 98 % compared to the maximum theoretical density of 100Mo (n = 5) and thicknesses of roughly 0.1 mm. All foils produced were the desired 20 mm width (i.e. limited by the width of the opening of the hopper) and trimmed to the desired 80 mm length. The annealing process was necessary due to the brittleness of the un-annealed rolled foil and the difference in the thermal expansion coefficients of molybdenum and aluminum which caused un-annealed foils in previous experiments to crack and break off during pressing (n = 10). Surface preparation of the aluminum support plate was also found to play a critical step in the efficiency of the bond, and continuing effort to scale the above de-scribed procedure to mass produce 100Mo tar-gets is ongoing. Targets have undergone preliminary testing to 250 μA.

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Hussain, Tanvir. "A study of bonding mechanisms and corrosion behaviour of cold sprayed coatings". Thesis, University of Nottingham, 2011. http://eprints.nottingham.ac.uk/11811/.

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Cold gas dynamic spraying (CDGS) is a material deposition technique, in which powder particles are accelerated to speeds of between 300-1200 m/s and upon impact deform plastically and adhere. The overall aims of this research project were to understand the bonding behaviour in cold spraying of copper, aluminium and titanium, and to produce corrosion resistance barrier layer of titanium coatings using cold spraying. The mechanism of bonding in cold spraying is still a matter of some debate. In this thesis, copper has been cold sprayed onto aluminium alloy substrates, the surfaces of which had been prepared in a variety of ways. The coating - substrate bonding was assessed via a novel intermetallic growth method along with adhesive pull-off testing. The bond strength has been rationalised in terms of a modified composite strength model, with two operative bonding mechanisms, namely (i) metallurgical bonding and (ii) mechanical interlocking of substrate material into the coating. In most cases, mechanical interlocking is able to account for a large proportion of the total bond strength, with metallurgical bonding only contributing significantly when the substrate had been polished and annealed prior to spraying. In addition, grit-blasting has been shown to significantly reduce the bond strength compared to other substrate preparation methods. Aluminium has also been cold sprayed onto copper substrates, the mechanical interlocking of substrate material was not observed and the bond strength was relatively low. Titanium particles have been deposited onto three different steel substrates, namely low carbon steel, an Armco iron, and an austenitic stainless steel. Using the novel intermetallic growth method it was found that a barrier does exist at the interface of the titanium deposited onto the low carbon steel and Armco iron substrates which is not removed in either of the stages of impact or during the heat treatment process. On the other hand, in the case of titanium deposited onto the austenitic stainless steel, the barrier is removed. Cold spraying is believed to have the potential for the deposition of corrosion resistant barrier coatings. However, to be effective, a barrier coating must not have interconnected porosity. Titanium coatings were sprayed using nitrogen as an accelerant gas at two process gas temperatures of 600 and 800˚C to reduce porosity. A modified in-situ grit blasting was used to improve the coating-substrate adhesion. The mean bond strength of the titanium deposits was ~70 MPa and tensile strength was 250 MPa. Mercury intrusion porosimetry (MIP) was used to characterize the interconnected porosity over a size range of micrometers to nanometers. The MIP results showed that in cold sprayed deposits a significant proportion of the porosity was sub-micron and so could not be reliably measured by optical microscope based image analysis. A set of free standing deposits was also vacuum heat treated to further decrease porosity levels. The effect of porosity on the corrosion behaviour of titanium coatings onto carbon steels was investigated in 3.5 wt.% NaCl. The electrochemical measurements of the coatings showed significant substrate influence when the interconnected porosity of the coating was 11.3 vol.% but a decreased substrate influence with a porosity level of 5.9 vol.%. Salt spray (fog) tests confirmed these electrochemical findings and showed the formation of corrosion products following 24-h exposure. Laser surface melting (LSM) was used to seal the top ~140 μm of the coating to eliminate any interconnected porosity. The LSM titanium coatings showed no sign of corrosion after 100-h of salt spray tests, and the open circuit potential and passive current density values were similar to those of the bulk titanium.

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Champagne, Victor K. Jr. "Investigation of the Effect of Oxides on the Critical Impact Velocity during the Cold Spray Process of High Purity Aluminum Powder". Digital WPI, 2018. https://digitalcommons.wpi.edu/etd-dissertations/506.

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The objective of the thesis is to understand the particle/substrate interaction of micron-sized High Purity (HP) aluminum (Al) powder particles with varying surface oxide/hydroxide layers, during single particle impact and determine the critical impact velocity (CIV). Advancements in analytical techniques enable in-situ supersonic impact of individual metallic micro-particles on substrates with micro-scale and nanosecond-level resolution. This novel capability allowed direct observation and measurement of a material-dependent threshold velocity, above which the particle underwent impact-induced material ejection and adhered to the substrate, (critical impact velocity). The data was then compared to empirical, as well as predicted values of the CIV from published data that were based upon theoretical iso-entropic fluid dynamics models. A major emphasis of this research was to perform, in-depth characterization of the Al powder in the as-received, gas atomized state and subsequent to controlled temperature and humidity exposure (designed to form a prescribed oxide and/or hydroxide surface layer) and finally after single particle impact. Analytical techniques including XPS, ICP, IGF, TEM and SEM were performed to determine the species of oxide and/or hydroxide, bulk chemical composition, oxygen content and thickness of the surface oxide/hydroxide layer. Finally, bulk samples of material were produced by the cold spray process, from powder representing select test groups and subsequently characterized to determine tensile and hardness properties, chemistry, microstructure and conductivity. A fundamental understanding of the role of surface oxidization in relationship to particle deformation during impact and the bonding mechanism will be applicable toward the development of optimized parameters for the cold spray (CS) process. Results from this study will aid in the development of industrial practices for producing, packaging and storing Al powders.

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Williams, David. "The use of cold atmospheric plasma (CAP) treatment for the structural adhesive bonding of metals". Thesis, University of Surrey, 2018. http://epubs.surrey.ac.uk/845705/.

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Adhesive bonding for structural applications has many advantages such as reducing the weight of vehicles and providing efficient stress transfer across joined materials. The largest asset of adhesive bonding is that they can join dissimilar materials. To achieve the highest joint strength possible when using metals, however, the metal surfaces have to be pre-treated. This can be done in a variety of ways, such as grit blasting or chemical etching. Chemically etching the surface produces the highest strength joints, but has many drawbacks. The first of which is that each metal used requires a different treatment chemistry. This reduces the materials available for selection as a result of increased pre-treatment complexity. The current work focusses on stainless steel and titanium alloy. The lap shear bond strength for both metals increased significantly after a cold atmospheric plasma (CAP) treatment and was in line with the chemical etching processes. The durability of both metals demonstrated that the plasma treatment increases the performance. For stainless steel the durability is similar to the chemical etch process. For titanium the durability performance is increased, but does not reach the level of the chemical treatment process. A combination of surface science techniques has revealed that there are three mechanisms which lead to an increased bond strength. These are: a reduction in hydrocarbon contamination, shown using X-ray photoelectron spectroscopy (XPS) and time of flight\,-\,secondary ion mass spectrometry (ToF-SIMS). The growth of the surface oxide layer, analysed using an XPS sputter depth profile, and functionalisation of the oxide layer, which has been probed using ToF-SIMS, both lead to an increase in lap shear bond strength. The feasibility of the process rests on two factors. The first is achieving equivalent mechanical properties, the second factor is the energy, resources and time required for a given treatment. The first has been satisfied in this work, the second has been investigated using a life cycle analysis approach which found that plasma treatment had a higher impact on the environment when compared to oxalic acid etching. but this assumed that the acid is 100\% efficient, which is far from the case. When simulated in a `real world' scenario, there is nearly parity between the two treatments Based on the data presented in this work, including analysis of the process life cycle, CAP has the potential as a first multi material pre-treatment for structural adhesive bonding.

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Nastic, Aleksandra. "Cold Gas Dynamic Spray Impact: Metallic Bonding Pre-Requisites and Experimental Particle In-Flight Temperature Measurements". Thesis, Université d'Ottawa / University of Ottawa, 2021. http://hdl.handle.net/10393/42086.

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The impact phenomena of high velocity micron-size particles, although commonly considered and described as detrimental in numerous engineering applications, can be used in a beneficial way if properly understood and controlled. The Cold Gas Dynamic Spray (CGDS) process, known as a surface modification, repair and additive manufacturing process, relies on such high velocity impacts. In the process, solid particles are accelerated by a supersonic gas flow to velocities up to 1200 m/s and are simultaneously heated to temperatures lower than their melting point. When propelled under proper velocity and temperature, the particles can bond onto a target surface. This bonding is caused by the resulting interfacial deformation processes occurring at the contact interface. Hence, the process relies heavily on the gas/particle and particle/substrate interactions. Although numerous experimental and/or numerical studies have been performed to describe the phenomena occurring during particle flight and impact in the CGDS process, numerous phenomena remain poorly understood. First, the effect of substrate surface topographical condition on the particle deformation and ability to successfully adhere, i.e. atomically and/or mechanically, has not been thoroughly investigated such that its influence is not well understood. Another aspect of the process that is generating the largest gap between experimental and numerical studies in the field is the lack of particle in-flight temperature measurements. Obtaining such data has proven to be technically difficult. The challenges stem from the short particle flight time, low particle temperature and small particle size preventing the use of established thermal spray pyrometry equipment. Relatedly, lack of such measurements precludes a proper experimental study of the impact related phenomena at the particle/substrate interface. As a result, the effect of particle size dependent temperature on overall coating properties and atomic bonding relies currently on estimates. Finally, the effect of particle impact characteristics on interfacial phenomena, i.e. grain size and geometry, velocity/temperature, and oxide scale thickness, on adhesion and deformation upon single particle collision has also been scarcely studied for soft particle depositions on hard substrate. Hence, the current research work aims at studying fundamental aspects of particle/gas heat transfer and particle/substrate impact features in goals to improve the understanding of the CGDS process. Different surface preparation methods will be used to create various surface roughness and topographical features, to provide a clear understanding of the target surface state influence on coating formation and adhesion. Additionally, new equipment relying on novel technology, i.e. high-speed IR camera, will be utilized to obtain particle in-flight temperature readings with sequence recordings. Subsequently, the experimental particle in-flight temperature readings will be used to develop a computational fluid dynamics model in goals to validate currently used Nusselt number correlations and heat transfer equations. The particle size-dependent temperature effect on the particle’s elastic and plastic response to its impact with a targeted surface and its ability to successfully bond and form a coating will be studied experimentally. A thorough CFD numerical work, based on experimental findings, will be included to provide full impact characteristics (velocity, temperature, size and trajectory) of successfully deposited particles. Finally, the numerical results will be utilized in the ensuing study to correlate single particle deformation, adhesion and interfacial features to impact characteristics. A finite element model will be included to investigate the effect of particle size dependent temperature on single particle interfacial pressure, temperature and bonding ability.

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新太郎, 水島. "Representations of masculinity and homosociality in cold war America : the beat generation and male homosocial bonding". Thesis, https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB12572742/?lang=0, 2012. https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB12572742/?lang=0.

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ROSALES-LOMBARDI, PABLO IVAN. "SURFACE CHARACTERIZATION OF THE INTERFACES FROM PLASMA-POLYMERIZED ACETYLENE FILMS DEPOSITED ONTO COLD-ROLLED STEEL FOR RUBBER-TO-METAL BONDING". University of Cincinnati / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1196034331.

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Blochet, Quentin. "Influence de la rugosité de surface du substrat sur l'adhérence de revêtements à base d'aluminium élaborés par projection dynamique par gaz froid ("cold spray")". Thesis, Paris, ENMP, 2015. http://www.theses.fr/2015ENMP0025/document.

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Le principe du procédé cold spray réside dans la projection de poudres à haute vitesse sur un matériau, le substrat. La formation d'un revêtement plus ou moins dense à sa surface passe par l'adhérence et l'empilement des particules projetées. Un des domaines d'application d'un tel procédé est la réparation de composants métalliques ou composites utilisés dans le secteur aéronautique. Les particules et le substrat adhèrent par différents mécanismes, notamment mécaniques. Les duretés respectives des matériaux et la topographie de surface du substrat influent sur l'intensité de cet ancrage mécanique. Cette étude permet de statuer sur ces deux contributions. Pour cela, des systèmes purement métalliques et composites aux propriétés mécaniques différentes sont choisis. Le dépôt de particules sur des surfaces rugueuses est étudié à travers l'élaboration de revêtements d'aluminium pur sur substrats d'alliage d'aluminium plus durs. Des mécanismes de déformation plastique et d'empilement sont analysés par construction de revêtements d'Al-SiC sur aluminium. L'élaboration de ces revêtements passe par l'optimisation de nombreux paramètres liés au procédé et à la nature des matériaux (température, pression, granulométrie). Les conditions d'impact des particules sont également déterminées par l'emploi de techniques mesurant la vitesse des poudres projetées (DPV 2000), la température du substrat par thermocouples et la température des particules par simulation numérique. L'ancrage mécanique des particules est analysé par observation en coupe de l'interface revêtement-substrat. Le gradient de dureté est également quantifié. Une analyse de la morphologie des surfaces sablées est réalisée afin de corréler la granulométrie des particules aux dimensions de rugosité mesurées. Un modèle d'impact par simulation numérique est mis en place pour étudier les déformations plastiques des interfaces en fonction de la topographie de surface. Enfin, des essais d'adhérence par choc laser (LASAT®) sont entrepris afin d'identifier le rôle de la rugosité d'interface sur les seuils de rupture déterminés numériquement
The cold spray process is based on high-speed spraying of a powder onto a substrate. The formation of a more or less dense coating depends on sprayed particle adhesion and coating build-up. The repair of metallic or composite aircraft / aerospace components is a recent application of cold spraying. The particle-substrate bond strength is due to various mechanisms, including mechanical anchoring. Substrate material hardness and surface topography governs the degree of mechanical anchoring. This thesis study is centered on the influence of these two contributions. Pure metallic and composite systems with different mechanical properties are selected. Particle deposition onto rough surfaces is investigated through the development of pure aluminium coating of harder aluminum alloy substrates. Plastic deformation and build-up mechanisms are studied for Al-SiC coatings onto ductile substrate. All the coatings resulted from an optimization stage where process parameters and materials properties are considered (gas temperature, gas pressure, particle size). Particle impact conditions are also determined by particle speed experimental measurements (using a DPV 2000 system). Substrate temperatures are determined using thermocouple and particle temperatures are studied by numerical simulation. Mechanical anchoring of particles is investigated by cross-section observation of the coating-substrate interface. Hardness gradient is also quantified. An analysis of sand-blasted surfaces morphology is performed to correlate particle size and roughness parameters. A model of particle impact is established from a finite element analysis of interface plastic deformation as a function of surface topography. Lastly, dynamic adhesion testing using a laser shock (LASAT®) are undertaken to study the potential role of interface roughness on the fracture thresholds in the light of a numerical analysis

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Pelletier, Jean-Louis. "Development of Ti-6Al-4V Coating onto Ti-6Al-4V Substrate Using Low Pressure Cold Spray and Pulse Gas Dynamic Spray". Thesis, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/24239.

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The objective of this study is to successfully deposit Titanium Ti-6Al-4V layers onto Ti-6Al-4V substrate using two new commercially available Cold Spray processes such as Low Pressure Cold Spray (LPCS) and Pulsed Gas Dynamic Spray (PGDS). The second objective of this work is to develop a technique to repair Titanium parts since there is currently no repair technique commercially available. It is envisioned that commercial cold spray systems could be used to repair gashes on Titanium components. The examination of both feedstock powders and coatings were performed by different techniques such as optical microscopy and Scanning Electron Microscopy (SEM). Porosity, hardness, adhesion strength, flattening ratio, wipe test, fracture surface, wear test, XRD and chemical composition of the coatings using EDS have been evaluated. Cold spray has shown to be a promising technique for the deposition of heat sensitive particles such as titanium. LPCS and PGDS both produced high quality coatings. Low porosity, high hardness, adhesion strength over 40 MPa, metallurgical bonding, similar to bulk material wear rate, no oxide and nitride phases inside coating were measured.

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Xie, Yingchun. "Etude de la déformation particule/substrat au mécanisme de liaison en projection à froid". Thesis, Belfort-Montbéliard, 2016. http://www.theses.fr/2016BELF0301/document.

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La projection à froid, aussi appelée cold spray, est considérée comme un nouveau membre de la famille de laprojection thermique depuis une trentaine d'années maintenant. Cette thèse propose d'étudier le comportement endéformation des particules et du substrat et de mettre en avant les liaisons formées dans le revêtement par deuxapproches complémentaires, expérimentale et de simulation.Une méthode innovante pour observer directement la surface fracturée des particules déposées après décollementdu substrat a été testée avec succès. Par ce moyen, la surface de contact entre particule et substrat sousdifférentes conditions a été analysée.Concernant les résultats expérimentaux, une nouvelle théorie a été proposée pour expliquer le mécanisme deliaison interfaciale d'un revêtement dur de Ni sur substrat mou d'Al reposant sur l'effet de martelage répété desparticules, sur l'effet de pression du gaz principal et sur l'effet de préchauffage du substrat. La transformation dumécanisme de liaison revêtement/substrat au cours de la construction du dépôt a été mise en évidence en passantdu verrouillage mécanique à une combinaison d'une liaison mécanique et d'une liaison métallurgique, puis à laformation d'instabilités sous forme d'un mélange tourbillonnaire à l'interface. Plus de zones de liaisonsmétallurgiques sont générées sous forte pression, une plus grande déformation plastique apparaît grâce latempérature de préchauffage, et une adhérence plus forte au sein des dépôts est capable de se produire en dépitde la présence d'un film d'oxyde épais sur la surface du substrat
Cold spraying, also called cold gas dynamic spraying, is a new coating technology which has been developed duringthe past three decade. In this study, a comprehensive investigation on particle deformation behavior and bondingbehavior between particle and substrate was conducted by experiment and numerical method.This thesis aims at presenting an innovative method to directly observe the fractured contact surface between thecold sprayed particle and substrate. By this means, the particle/substrate fractured contact surfaces were analyzedfor different conditions.Based on the experimental results, a new theory was proposed to explain the interfacial bonding mechanism of hardNi coating onto soft Al substrate. It is assumed that the particle peening effect is essential for the formation ofdiscontinuous metallurgical bonding. The dominant coating/substrate bonding mechanism is responsible of thetransformation during the coating build-up process of the initial mechanical interlocking to a combination ofmechanical interlocking and metallurgical bonding therefore of the formation of interfacial instabilities. The highcontact pressure is the relevant factor determining the particle/substrate metallurgical bonding. More metallurgicalbonding areas were generated due to strengthen peening effect of the subsequently deposited particles with higherpropelling gas pressure. Finally, stronger adhesion is able to occur despite the presence of a thick oxide film on thesubstrate surface by the preheating of the substrate. Higher temperatures help the materials to undergoes astronger plastic deformation that disrupts the oxide films. That leads to initiate an intimate contact between particleand substrate

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Książki na temat "Cold-bonding"

Wheeler, Nicholas J. USA–Soviet Union, 1985–1989. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780199696475.003.0007.

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Chapter 6 focuses on US–Soviet interactions 1985–90. The end of the cold war is hotly debated, with competing explanations in IR, including trust-based ones. However, none of these explanations adequately explains the transformation in superpower relations in the later 1980s. The chapter posits the importance of the theory of bonding trust in explaining how Reagan and Gorbachev came to interpret each other’s signals accurately, and the subsequent ending of the cold war. It argues that what changed Reagan’s perceptions of Gorbachev’s signals was the process of bonding and trust emergence that led to a transformation of their identities, made possible by their face-to-face diplomacy at four summits, especially Reykjavik. Reagan’s successor, George H. W. Bush, did not initially trust Gorbachev. Only after Bush and Gorbachev had developed a relationship of trust did the President, and especially his Secretary of State, James Baker, trust the Soviet leader’s intentions.

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Części książek na temat "Cold-bonding"

Pamler, Werner, i Franz Richter. "Thin Wafer Support System for above 250°C Processing and Cold De-Bonding". W Handbook of Wafer Bonding, 355–65. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2012. http://dx.doi.org/10.1002/9783527644223.ch18.

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Ciupik, Lechoslaw F. "Mechanisms of Cold Deformation Bonding and Quality of Bimetallic Products". W Werkstoff und Umformung, 109–26. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82984-0_6.

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Liu, Xuefeng, Xing Ming, Dandan Zhang i Zhangzhi Shi. "Effect and Mechanism of Cold-Hot Roll Bonding Process on Interfacial Bonding Properties of Aluminum/Steel Laminated Composite Plate". W Lecture Notes in Mechanical Engineering, 287–305. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0107-0_27.

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Acoff, Viola L., i Ren Gang Zhang. "Processing Ti-Al-Nb Composite Sheet Materials Using Cold Roll Bonding and Reaction Annealing". W THERMEC 2006, 791–96. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-428-6.791.

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Song, X., X. Z. Jin, J. Everaerts, W. Y. Tan, W. Sun, I. Marinescu, W. Zhai, F. Li, E. J. Liu i A. M. Korsunsky. "Bonding Strength Improvement Through Numerical Simulation of Particle Impact Process During Metal Cold Spray". W Lecture Notes in Mechanical Engineering, 144–52. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-15-0054-1_15.

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Verian, Kho P., Jarron Ashcroft, Matthew D. Carli, Randall P. Bright, Eerik Maandi, Avak Avakian i Edouard Baaklini. "Improving the Bonding Adhesion of the Cold Joints of Normal and Lightweight 3D Printing Mortars". W RILEM Bookseries, 527–36. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-49916-7_54.

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Sim, K. S., i Yong Sin Lee. "A Bonding Map for Cu and Al Plates by Pressure Welding at Cold and Warm Temperatures". W Materials Science Forum, 2667–70. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-960-1.2667.

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Navidirad, Mahsa, Wojciech J. Stepniowski, Elijah Cartier, Tyler Christ, Masashi Watanabe i Wojciech Z. Misiolek. "Investigation on the Strain Induced Oxide Layer Fracture and Bonding During Cold Rolling of Aluminum Alloys". W Forming the Future, 1469–77. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-75381-8_122.

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Irinah Omar, Noor, Motohiro Yamada, Toshiaki Yasui i Masahiro Fukumoto. "Influence of Annealed Aluminum Properties on Adhesion Bonding of Cold Sprayed Titanium Dioxide Coating". W Plastic Deformation in Materials [Working Title]. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.94097.

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It is well known that cold spraying ceramic materials can be difficult because cold spraying requires plastic deformation of the feedstock particles for adhesion to the substrate. The challenge lies in the difficulty of plastically deforming hard and brittle ceramic materials, such as TiO2. Previous studies have reported the possibility of cold spraying thick pure TiO2 but the bonding mechanism of cold sprayed TiO2 is not fully understood. The factor like substrate condition as oxide film thickness and mechanical properties may also affect cold spray deposition but not fully understood in cold spraying ceramic. The aim of the present research is to investigate the correlation between the oxide thickness and substrate deformation with the adhesion strength of cold-sprayed TiO2 coatings toward the bonding mechanism involved. Relevant experiments were executed using Al 1050, subjected to various annealing temperatures and cold-sprayed with TiO2 powder. The results indicate a decreasing trend of coating adhesion strength with increasing annealed substrate temperature from room temperature to 400°C annealed. Metallurgical bonding is pronounced as bonding mechanism involved between TiO2 particle and annealed 1050 substrate.

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GRUJICIC, M. "Particle/substrate interaction in the cold-spray bonding process". W The Cold Spray Materials Deposition Process, 148–77. Elsevier, 2007. http://dx.doi.org/10.1533/9781845693787.2.148.

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Streszczenia konferencji na temat "Cold-bonding"

Tran Ngoc Dam i Do Thai Quan. "Shoes surface bonding by cold plasma technology". W 2017 International Conference on System Science and Engineering (ICSSE). IEEE, 2017. http://dx.doi.org/10.1109/icsse.2017.8030962.

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Kim, Sung Hwan, Chaewon Kim i Changheui Jang. "Diffusion Bonding of a Cold-Worked Ni-Base Superalloy". W ASME 2018 Symposium on Elevated Temperature Application of Materials for Fossil, Nuclear, and Petrochemical Industries. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/etam2018-6716.

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Diffusion bonding was conducted on cold-worked Alloy 600. Cold-work of 50 % was applied prior to diffusion bonding in order to incite recrystallization and limit grain growth. Tensile testing was conducted at room temperature and 550 °C for evaluation of joint efficiency, while premature brittle failure at the bond-line was observed for most diffusion bonding conditions. It was found that such premature failure was related to a planar bond-line that indicated lack of grain boundary diffusion across the bonding surfaces. Additional application of post-bond heat treatments did not result in significant bond-line migration. Microstructural analyses revealed the existence of Cr-rich carbides and Ti-rich precipitates along the bond-line, which prevented bond-line migration by acting as pinning points.

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Shi, Jianfeng, Jinyang Zheng, Weican Guo i Cheng Xu. "Safety Assessment of Cold Welding Defect in Electro-Fusion Joint of Polyethylene Pipe". W ASME 2012 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/pvp2012-78655.

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Cold welding defect is the most common defect in electro-fusion (EF) joint for connecting polyethylene (PE) pipe. In our previous study[1], the cold welding defect is successfully inspected by an Eigen-line method based on phased array ultrasonic testing technology. However, small amount of research has been reported on the acceptance criterion of cold welding defect in EF joint. In this paper, the bonding strength of EF joint is measured using a peeling test. The bonding energy of welding interface is calculated both by phenomenological model and deformation energy analysis method. EF joints with different degrees of cold welding are made and used for peeling tests. The results show that the bonding energy of fused interface rises rapidly after bonding and then goes through a plateau region. The starting point of the plateau region in the bonding energy vs. welding time curve is regarded as the minimum required welding time of EF joint. Based on bilinear fitting, the acceptable criterion of cold welding defect is proposed.

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Noh, Seungjun, Chanyang Choe, Chuantong Chen, Hao Zhang i Katsuaki Suganuma. "Bonding technology using cold-rolled Ag sheet in die-attachment applications". W 2018 International Power Electronics Conference (IPEC-Niigata 2018-ECCE Asia). IEEE, 2018. http://dx.doi.org/10.23919/ipec.2018.8507831.

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Sun, Wen, Adrian Wei Yee Tan, Iulian Marinescu i Erjia Liu. "Effects of Surface Roughness on Bonding Behavior of Cold Spray Ti6Al4V Coatings". W ASME 2017 12th International Manufacturing Science and Engineering Conference collocated with the JSME/ASME 2017 6th International Conference on Materials and Processing. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/msec2017-2753.

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In this study, a penitential additive manufacturing method - cold spray was used to deposit Ti6Al4V powders onto Ti6Al4V substrates with different surface roughness by using a high pressure cold spray system. The coating quality was good with limited porosity and without phase transition. Interface bonding behavior between coating and substrate was studied, which indicated that smoother substrate surface would increase the bonding strength. Bending test showed that all the coated samples started to delaminate before substrate failure and smoother surface samples could resist higher stress than the rougher surface samples.

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Yao, Jian, Jia Xu i Li Xing. "Finite element analysis of bonding connections between cold-formed steel Z sections". W 2011 Second International Conference on Mechanic Automation and Control Engineering (MACE). IEEE, 2011. http://dx.doi.org/10.1109/mace.2011.5988356.

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Ren, Baihua, i Jun Song. "Peridynamic Simulation of Particles Impact and Interfacial Bonding in Cold Spray Process". W ITSC2021, redaktorzy F. Azarmi, X. Chen, J. Cizek, C. Cojocaru, B. Jodoin, H. Koivuluoto, Y. C. Lau i in. ASM International, 2021. http://dx.doi.org/10.31399/asm.cp.itsc2021p0396.

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Abstract Recently, cold spray (CS) technology has attracted extensive interest as an alternative to thermal spray methods to build a coating, which uses high kinetic energy solid particles to impact and adhere to the substrate. To date, numerous numerical studies have been carried out to investigate the deposition processes and associated mechanisms during multiple particle impact in CS. However, in the commonly used numerical techniques, the individual powder particles are often treated separately from one another, thus fail to properly consider the adhesion mechanisms during deposition. In this study, we propose a new numerical approach on base of peridynamics (PD), which incorporates interfacial interactions as a part of constitutive model to capture deformation, bonding and rebound of impacting particles in one unified framework. Two models are proposed to characterize the adhesive contacts: a) a long-range Lenard-Johns type potential that reproduce the mode I fracture energy by suitable calibrations, and b) a force - stretch relation of interface directly derived from the bulk materials mode I fracture simulations. The particle deformation behavior modeled by the peridynamic method compares well with the benchmark finite element method results, which indicates the applicability of the peridynamic model for CS simulation. Furthermore, it is shown that the adhesive contact models can accurately describe interfacial bonding between the powder particles and substrate.

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Saito, Hiroki, Hiroaki Ebihara, Yuji Ichikawa i Kazuhiro Ogawa. "Effect of Pre-Treatment on Substrates for Metal Coatings Fabricated by Low Pressure Cold Spray Technique". W ITSC2021, redaktorzy F. Azarmi, X. Chen, J. Cizek, C. Cojocaru, B. Jodoin, H. Koivuluoto, Y. C. Lau i in. ASM International, 2021. http://dx.doi.org/10.31399/asm.cp.itsc2021p0203.

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Abstract Low pressure cold spraying is an attractive technique for onsite metal coating fabrication due to its compactness and portability. However; the bonding strength of the coating prepared by low pressure cold spraying is generally low; which restricts the further applications in engineering and industrial fields. To improve the bonding strength; pre-treatment on substrate surface can be an effective procedure. In this study; a low-temperature plasma treatment was applied to a pretreatment technique; and the effect of the treatment on particle bonding was compared with that of a laser treatment. Copper coatings on aluminum and copper substrates were selected and studied as basic metal materials. The SEM observation results show that the particle adhesion rate significantly increases by the laser and plasma treatments; due to the removal of the native oxide films on the substrates. The particle bonding on the plasma-treated substrate reveals better interfacial adhesion with less gap compared with the laser-treated one. The pre-treatment by low-temperature plasma can be an attractive technique to assist the cold spraying process due to the oxide removal ability and no thermal effect which can apply a wide range of materials.

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Sinha, K., D. Farley, T. Kahnert, S. Solares, A. Dasgupta, J. F. J. Caers i X. J. Zhao. "Cold Welding Phenomenon in Adhesively Bonded Flip-Chip Interconnects". W ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-12650.

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In the conversion to Pb-free electronics, there has been increasing interest in conductive adhesive interconnects, as they combine Pb-free materials with the added benefit of low temperature processing. This work explores the degradation mechanisms and kinetics in adhesively bonded Au-bumped flip chip interconnects. Earlier researchers have suggested that electrical contact is by mechanical interfacial compression caused cure-induced shrinkage of the adhesive and degradation is by stress relaxation of the adhesive material during temperature and moisture cycling throughout the life cycle. However, temperature cycling conducted here raises questions about the validity of this hypothesis since no such progressive degradation is found under temperature cycling. Instead, overstress failures were found at cold temperatures. The alternate interconnection mechanism between the Au bumps, suggested by this study, is metallurgical bonding by cold welding or mechanical interlocking. Experimental and modeling results showing evidence of this cold welding phenomenon are presented here. First, the surface roughness of unmated and mated Au bumps are characterized on flip-chip dies, since the amount of surface flattening provides insights into both mechanical interlocking as well as propensity for cold-welding. A corresponding elastic-plastic, large-deformation finite element modeling with nonlinear contact surfaces is used to further understand and quantify this surface-flattening phenomenon. Next, pull tests for flip-chip to flip-chip assemblies were designed to measure the bond strength and observe the temperature & time dependence of the strength at the interface. The results clearly showed strong evidence that the bonding mechanism may be either diffusionassisted metallurgical bonding or increase in contact area over time due to new bond formation. This work is somewhat novel, as prior examples of low-temperature cold welding are mostly for very thin gold films.

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Viscusi, A. "Numerical investigations on the rebound phenomena and the bonding mechanisms in cold spray processes". W PROCEEDINGS OF THE 21ST INTERNATIONAL ESAFORM CONFERENCE ON MATERIAL FORMING: ESAFORM 2018. Author(s), 2018. http://dx.doi.org/10.1063/1.5034957.

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