Journal articles: 'Si3N4 tool'

1

Zou, Bin, Chuan Zhen Huang, Han Lian Liu, and Jin Peng Song. "Cutting Performance and Wear Mechanism of Si₃N₄-Based Nanocomposite Ceramic Tool." Key Engineering Materials 443 (June 2010): 324–29. http://dx.doi.org/10.4028/www.scientific.net/kem.443.324.

Full text

Abstract:

Si3N4/TiN nanocomposite tool and Si3N4/Ti(C7N3) nanocomposite tool were prepared. The cutting performance and wear mechanism of Si3N4-based nanocomposite ceramic tool was investigated by comparison with a commercial sialon ceramic tool in machining of 45 steel. Si3N4-based nanocomposite ceramic tool exhibits the better wear resistance than sialon at the relatively high cutting speed. The increased cutting performance of Si3N4-based nanocomposite ceramic tool is ascribed to the higher mechanical properties. Nano-particles can refine the matrix grains and improve the bonding strength among the matrix grains of Si3N4-based nanocomposite ceramic tool materials. It contributes to an improved wear resistance of the cutting tools during machining.

APA, Harvard, Vancouver, ISO, and other styles

2

Wang, Zhenhua, Jiheng Jia, Liyan Cao, Ning Sun, and Yulin Wang. "Microstructure and Mechanical Properties of Spark Plasma Sintered Si3N4/WC Ceramic Tools." Materials 12, no. 11 (June 10, 2019): 1868. http://dx.doi.org/10.3390/ma12111868.

Full text

Abstract:

Silicon nitride (Si3N4) based ceramic tools exhibit good machinability in cutting materials such as gray cast iron, ductile iron, malleable cast iron, and superalloys due to excellent high-temperature mechanical properties. In this paper, high-performance Si3N4-based ceramic tools containing tungsten carbide (WC) and cobalt (Co) were studied. Effects of the WC content and Co content on mechanical properties and a microstructure of Si3N4-based ceramic materials were analyzed. Results showed that Si3N4-based ceramic material containing 10 wt % WC and 1 wt % Co had the best comprehensive mechanical properties at a sintering temperature of 1650 °C and holding time of 6 min, achieving Vickers hardness, fracture toughness, and room temperature bending strength of 16.96 GPa, 7.26 MPa·m1/2, and 1132 MPa, respectively. The microstructure of Si3N4-based ceramic tool material is uniform without obvious abnormal growth. The Si3N4-based ceramic tool was mainly composed of α-Si3N4, β-Si3N4, and WC phases.

APA, Harvard, Vancouver, ISO, and other styles

3

Lü, Zhi Jie, Ming Feng Ding, and Jun Zhao. "Wear Mechanism of Si₃N₄/TiC Micro-Nano-Composite Ceramic Tool in Dry Machining of Nodular Cast Iron." Applied Mechanics and Materials 319 (May 2013): 79–83. http://dx.doi.org/10.4028/www.scientific.net/amm.319.79.

Full text

Abstract:

In this paper, a type of Si3N4/TiC micro-nano-composite ceramic tool materials were fabricated via hot pressing technique by adding Si3N4 and TiC nanoparticles and with Al2O3 and Y2O3 as additives. Tool wear in dry machining of nodular cast iron with Si3N4/TiC micro-nano-composite ceramic tool were investigated, in comparison with a commercial Sialon ceramic tool. For determination of the wear resistance, the workpiece which is prepared to be used in the experiment, 400 mm in length and 120 mm in diameter, is machined in lathe. Turning experiments were carried out at three different cutting speeds, which were 110, 175, and 220 m/min respectively. Feed rate (f) and depth of cut (ap) were kept fixed at 0.1mm/rev and 0.5mm. The results show that the two types of cutting tools have similar cutting tool wear behavior, while the Si3N4/TiC micro-nano-composite tool exhibits a better wear resistance than that of the Sialon tool. The wear of Si3N4/TiC micro-nano-composite ceramic cutting tool is mainly dominated by the abrasion, while the wear of Sialon ceramic cutting tool is dominated by the abrasive action, microcracking and pullout of grains.

APA, Harvard, Vancouver, ISO, and other styles

4

Lü, Zhi Jie, Xian Chun Song, Ming Feng Ding, and Yong Hui Zhou. "Cutting Force, Temperature and Wear Behavior in Dry Machining of Nodular Cast Iron with Si₃N₄/TiC Micro-Nano-Composite Ceramic Tool." Advanced Materials Research 711 (June 2013): 267–71. http://dx.doi.org/10.4028/www.scientific.net/amr.711.267.

Full text

Abstract:

In this paper, a type of Si3N4/TiC micro-nanocomposite ceramic tool materials were fabricated via hot pressing technique by adding Si3N4 and TiC nanoparticles. Cutting forces, temperature and wear behavior in dry machining of nodular cast iron with Si3N4/TiC micro-nanocomposite ceramic tool were investigated, in comparison with a commercial Sialon ceramic tool. Turning experiments were carried out at three different cutting speeds, which were 110, 175, and 220 m/min. Feed rate ( f ) and depth of cut (ap) were kept fixed at 0.1 mm/rev and 0.5 mm. The results show that the radial thrust force (Fy) become the largest among the three cutting force components (Fx , Fy and Fz), and Fy is the most sensitive to the changes of feed rate and depth of cut. In dry cutting of nodular cast iron, the cutting tool temperature rise rapidly with increase in cutting speed. The cutting temperature reach nearly 1000°C at the cutting speed of 220 m/min. The two types of ceramic tools have similar cutting performance, while the Si3N4/TiC micro-nanocomposite tool exhibits a better cutting performance than that of the Sialon tool. The wear rate of Si3N4/TiC micro-nanocomposite ceramic cutting tool is mainly dominated by the abrasion, while the wear rate of Sialon ceramic cutting tool is dominated by the abrasive action, and pullout of grains.

APA, Harvard, Vancouver, ISO, and other styles

5

Lü, Zhi Jie, Jun Zhao, and Wei Min Wang. "Microstructure and Wear Behavior of Si₃N₄/TiC Nanocomposite Ceramic Tool Material." Advanced Materials Research 279 (July 2011): 54–60. http://dx.doi.org/10.4028/www.scientific.net/amr.279.54.

Full text

Abstract:

Si3N4/TiC nanocomposite cutting tool materials were fabricated by adding Si3N4 and Al2O3 nanocomposites with Al2O3 and Y2O3 as additives. The microstructures of materials were analyzed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), and then wear resistance of Si3N4/TiC nanocomposite cutting tool materials was studied when machining cast iron and quenched steel in continuous dry turning experiments. Micrographs of the worn tools materials were observed with SEM. Results showed that TiC nanoparticles distribute in the matrix grains and lead to the crack deflection as well as crack pinning. Due to TiC nanoparticles and β-Si3N4 quasiwhiskers, the crack trajectories exhibited crack deflection, rod-like grain bridging and pull-out. Wear mode of Si3N4/TiC inserts is mainly abrasive wear with slighter adhesive wear when machining cast iron. The dominant wear patterns during the cutting of quenched steel were adhesion, abrasion, as well as oxidation and diffusion under high temperature.

APA, Harvard, Vancouver, ISO, and other styles

6

Wu, Zhi Yuan, Xiao Jun Shi, Xin Li Tian, Xiu Jian Tang, and Shu Zhang. "Heat Cutting for Remanufacture Hardness Deposited Materials." Applied Mechanics and Materials 101-102 (September 2011): 978–81. http://dx.doi.org/10.4028/www.scientific.net/amm.101-102.978.

Full text

Abstract:

Three cutting tools, YG610, Si3N4 ceramic tool and CBN were adopted for heat cutting deposited materials. The test results show that though the impacts to the tools reducing, the CBN still break seriously. The condition by Si3N4 ceramic tool is better than CBN, whose types of tool failure change from breakage to wear. The YG610 is best material for heat cutting, whose minimum VB value is only 0.3mm. In the experiment, the wear increase with the increasing of heating temperature, cutting speed, cutting depth. But it decreased with feed rate. The analysis results show that the red-hardness is most importance factor for wears of YG610.

APA, Harvard, Vancouver, ISO, and other styles

7

Zou, Bin, Chuan Zhen Huang, Jun Wang, and Bing Qiang Liu. "Effect of Nano-Scale TiN on the Mechanical Properties and Microstructure of Si₃N₄ Based Ceramic Tool Materials." Key Engineering Materials 315-316 (July 2006): 154–58. http://dx.doi.org/10.4028/www.scientific.net/kem.315-316.154.

Full text

Abstract:

An effect of nano-scale TiN grains on the mechanical properties and microstructure of Si3N4 based ceramic tool materials is investigated at the different sintering temperature. Compared to monolithic Si3N4 ceramic tool materials, the sintering temperature is decreased and mechanical properties is enhanced when only one percent of nano-scale TiN in term of mass is added into the Si3N4 matrix. The optimum mechanical properties are achieved when Si3N4/TiN nanocomposites tool materials were sintered at the sintering conditions of 1650, 30MPa and holding time of 40min. The flexural strength, fracture toughness and hardness are 1018.2MPa, 8.62MPa⋅m1/2 and 14.58GPa respectively. SEM micrographs indicate that microstructure is composed of the elongated and equiaxed β-Si3N4 grains, and some nano-scale TiN grains are enveloped into matrix grains.

APA, Harvard, Vancouver, ISO, and other styles

8

Liu, Y. R., J. J. Liu, B. L. Zhu, Z. R. Zhou, L. Vincent, and P. Kapsa. "Wear maps of Si3N4 ceramic cutting tool." Journal of Materials Engineering and Performance 6, no. 5 (October 1997): 671–75. http://dx.doi.org/10.1007/s11665-997-0063-7.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Kuzin, Valery V., and Sergey N. Grigoriev. "Tool Life and Wear Mechanism of Coated Si₃N₄ Ceramic Tools in Turning Grey Cast Iron." Key Engineering Materials 581 (October 2013): 14–17. http://dx.doi.org/10.4028/www.scientific.net/kem.581.14.

Full text

Abstract:

This paper presents results of the investigation of Si3N4 ceramic inserts with CVD coatings in turning grey cast iron. The high effectiveness of Si3N4 ceramic inserts with multi-layered coating in the finish turning of the grey irons was shown. It was established that at the heart of the wear mechanism of coated Si3N4 ceramic inserts there is a chain of relations cutting conditions loading fracture of coating сhipping of ceramic surface layer failure of tools. One of the important features of wear mechanism of these tools is the operational defects formed at the coating substrate interface.

APA, Harvard, Vancouver, ISO, and other styles

10

Souza, José Vitor C., Maria do Carmo de Andrade Nono, Sergio Luiz Mineiro, M. V. Ribeiro, and Olivério Moreira Macedo Silva. "Evaluation of the Performance of α-SiAlON Tool when Turning Ti–6Al–4V Alloy without Coolant." Materials Science Forum 591-593 (August 2008): 554–59. http://dx.doi.org/10.4028/www.scientific.net/msf.591-593.554.

Full text

Abstract:

Due to their high hardness and wear resistance, Si3N4 based ceramics are one of the most suitable cutting tool materials for machining cast iron, nickel alloys and hardened steels. However, their high degree of brittleness usually leads to inconsistent results and sudden catastrophic failures. This necessitates a process optimization when machining superalloys with Si3N4 based ceramic cutting tools. The tools are expected to withstand the heat and pressure developed when machining at higher cutting conditions because of their high hardness and melting point. This paper evaluates the performance of α-SiAlON tool in turning Ti–6Al–4V alloy at high cutting conditions, up to 250 m min−1, without coolant. Tool wear, failure modes and temperature were monitored to access the performance of the cutting tool. Test results showed that the performance of α-SiAlON tool, in terms of tool life, at the cutting conditions investigated is relatively poor due probably to rapid notching and excessive chipping of the cutting edge. These facts are associated with adhesion and diffusion wear rate that tends to weaken the bond strength of the cutting tool.

APA, Harvard, Vancouver, ISO, and other styles

11

Ozcatalbas, Yusuf, Ersin Bahceci, and Mehmet Turker. "Effect of Cutting Tool Materials on Surface Roughness and Cutting Forces in Machining of Al-Si₃N₄ Composite Produced by Powder Metallurgy." Materials Science Forum 534-536 (January 2007): 869–72. http://dx.doi.org/10.4028/www.scientific.net/msf.534-536.869.

Full text

Abstract:

In this study, aluminum-based composites reinforced with various amounts of α-Si3N4 were produced by powder metallurgy (P/M). The machinability properties of MMCs were determined by means of cutting forces and surface roughness. Machining tests were carried out by using PCD and K10 cutting tools. Increasing of Si3N4 volume fraction in the matrix resulted in a decrease of the surface roughness and turning forces. PCD cutting tools showed better cutting performance than K10 tools. Surface roughness and turning forces were decreased significantly by PCD tool.

APA, Harvard, Vancouver, ISO, and other styles

12

Zhao, Jun, Xing Ai, and Z. J. Lv. "Study on the Thermal Shock Resistance of Si₃N₄/TiC Nanocomposite Ceramic Tool Materials." Key Engineering Materials 315-316 (July 2006): 299–303. http://dx.doi.org/10.4028/www.scientific.net/kem.315-316.299.

Full text

Abstract:

By adding nano Si3N4 and nano TiC particles into the micro Si3N4 matrix, the Si3N4/TiC nanocomposite ceramics were fabricated via hot pressing technique with Al2O3 and Y2O3 as sintering additives. The thermal shock resistance of Si3N4/TiC nanocomposites were investigated by means of indentation-quenching and quenching-retained strength testing methods. The results revealed that the composite containing 10 wt.% nano Si3N4 particles and 15 wt.% nano TiC nano particles was possessed of the highest thermal shock resistance, with its critical temperature difference being 700~750. The toughening and strengthening mechanisms by the nano particles addition are deem to be the essential course for the improved thermal shock resistance.

APA, Harvard, Vancouver, ISO, and other styles

13

Ariff, Tasnim Firdaus, Mohammad Iqbal, and Rubina Bahar. "Cost Analysis of Using Hybrid Microwave Post-Sintered Silicon Nitride Inserts." Advanced Materials Research 1115 (July 2015): 192–95. http://dx.doi.org/10.4028/www.scientific.net/amr.1115.192.

Full text

Abstract:

Heat treatment is a process often used to improve product performance by increasing the strength of material or other desirable characteristics. Silicon nitride (Si3N4) tool insert is known for its attractive properties including high fracture toughness, strength and wear resistance at elevated temperatures. Heat treating these inserts by post-sintering them for 15 minutes at 600°C using conventional heating and hybrid microwave energy has prolonged tool life by 11-21% and 48-94% respectively. Machining was performed on a T6061 Aluminium alloy rod for tool life analysis at three different cutting speeds; 215, 314 and 393 m/min. Cost analysis is performed on these post-sintered Si3N4 inserts and found that there are economical benefits in the tooling cost when compared with the untreated Si3N4 inserts.

APA, Harvard, Vancouver, ISO, and other styles

14

Liu, Chien Cheng, and Jow Lay Huang. "Microstructure and Electrode Discharge Machining of TiN/Si₃N₄ Composites." Materials Science Forum 475-479 (January 2005): 1337–40. http://dx.doi.org/10.4028/www.scientific.net/msf.475-479.1337.

Full text

Abstract:

Conductive TiN/Si3N4 ceramic composites were processed by electrical discharge machining (EDM) and their microstructure and conductivity investigated. A low electrical resistivity of 1.25×10-3Ω.cm was obtained in 40vol%TiN/Si3N4 composite. The whole process of tool electrode wear is evaluated by sinker-EDM. The machined surfaces of TiN/Si3N4 ceramic composites were examined by scanning electron microscopy (SEM) and profilometry to determine the surface finish. Micropores of 700µm in depth and 70µm in diameter were successfully machined in TiN/ Si3N4 composites by the micro-EDM method.

APA, Harvard, Vancouver, ISO, and other styles

15

Bin, Zou, Huang Chuanzhen, Chen Ming, Gu Meilin, and Liu Hanlian. "High-temperature oxidation behavior and mechanism of Si3N4/Si3N4w/TiN nanocomposites ceramic cutting tool materials." Materials Science and Engineering: A 459, no. 1-2 (June 2007): 86–93. http://dx.doi.org/10.1016/j.msea.2007.02.049.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Souza, José Vitor C., Maria do Carmo de Andrade Nono, João Paulo Barros Machado, Olivério Moreira Macedo Silva, F. C. L. Melo, and M. V. Ribeiro. "Cutting Performance of Diamond Coated Si₃N₄ Tool During Turning." Materials Science Forum 660-661 (October 2010): 106–11. http://dx.doi.org/10.4028/www.scientific.net/msf.660-661.106.

Full text

Abstract:

Silicon nitride cutting tools have been used successfully for machining hard materials, like: cast irons, nickel based alloys, etc. However these cutting tools with diamond coating present little information on dry turning operations of gray cast iron. In the present work, Si3N4 square inserts was developed, characterized and subsequently coated with diamond for dry machining operations on gray cast iron. All experiments were conducted with replica. It was used a 1500, 3000, 4500 m cutting length, feed rate of 0.33 mm/rev and keeping the depth of cut constant and equal to 1 mm. The results show that wear in the tool tips of the Si3N4 inserts, in all cutting conditions, was caused by both mechanical and chemical processes. To understand the tool wear mechanisms, a morphological analysis of the inserts, after experiments, has been performed by SEM and optical microscopy. Diamond coated PVD inserts showed to be capable to reach large cutting lengths when machining gray cast iron.

APA, Harvard, Vancouver, ISO, and other styles

17

Souza, José Vitor C., Maria do Carmo de Andrade Nono, M. V. Ribeiro, Olivério Moreira Macedo Silva, and M. A. Lanna. "Turning of Compacted Graphite Iron Using Commercial TiN Coated Si₃N₄ under Dry Machining Conditions." Materials Science Forum 591-593 (August 2008): 604–9. http://dx.doi.org/10.4028/www.scientific.net/msf.591-593.604.

Full text

Abstract:

Due to their high hardness and wear resistance Si3N4 based ceramics are one of the most suitable cutting tool materials for machining hardened materials. Therefore, their high degree of brittleness usually leads to inconsistent results and sudden catastrophic failures. Improvement of the functional properties these tools and reduction of the ecological threats may be accomplished by employing the technology of putting down hard coatings on tools in the state-of-the-art PVD processes, mostly by improvement of the tribological contact conditions in the cutting zone and by eliminating the cutting fluids. However in this paper was used a Si3N4 based cutting tool commercial with a layer TiN coating. In this investigation, the performance of TiN coating was assessed on turning used to machine an automotive grade compacted graphite iron. As part of the study were used to characterise the performance of cutting tool, flank wear, temperature and roughness. The results showed that the layer TiN coating failed to dry compacted graphite iron under aggressive machining conditions. However, using the measurement of flank wear technique, the average tool life of was increased by Vc=160 m/min.The latter was also observed using a toolmakers microscope and scanning electron microscopy (SEM).

APA, Harvard, Vancouver, ISO, and other styles

18

Silva, Olivério Moreira Macedo, José Vitor C. Souza, Maria do Carmo de Andrade Nono, G. V. Martins, M. V. Ribeiro, and João Paulo Barros Machado. "Development of Ceramic Cutting Tools for Future Application on Dry Machining." Materials Science Forum 660-661 (October 2010): 724–29. http://dx.doi.org/10.4028/www.scientific.net/msf.660-661.724.

Full text

Abstract:

Advanced ceramic materials constitute a mature technology with a very broad base of current and potential applications and a growing list of material compositions. Within the advanced ceramics category, silicon nitride based ceramics are wear-resistant, corrosion- resistant and lightweight materials, and are superior to many materials with regard to stability in high-temperature environments. Because of this combination the silicon nitride ceramics have an especially high potential to resolve a wide number of machining problems in the industries. Presently the Si3N4 ceramic cutting tool inserts are developed using additives powders that are pressed and sintered in the form of a cutting tool insert at a temperature of 1850 oC using pressureless sintering. The microstructure of the material was observed and analyzed using XRD, SEM, and the mechanical response of this array microstructure was characterized for hardness Vickers and fracture toughness. The results show that Si3N4/20 wt.% (AlN and Y2O3) gives the best balance between hardness Vickers and fracture toughness. The Si3N4/15 wt.% (AlN and Y2O3) composition allows the production of a very fine-grained microstructure with low decreasing of the fracture toughness and increased hardness Vickers. These ceramic cutting tools present adequate characteristics for future application on dry machining.

APA, Harvard, Vancouver, ISO, and other styles

19

Souza, José Vitor C., Maria do Carmo de Andrade Nono, Olivério Moreira Macedo Silva, G. V. Martins, João Paulo Barros Machado, and M. Pimenta. "Development and Characterization of Si₃N₄ Coated AlCrN Ceramic Cutting Tool." Materials Science Forum 660-661 (October 2010): 697–700. http://dx.doi.org/10.4028/www.scientific.net/msf.660-661.697.

Full text

Abstract:

Nowadays, silicon nitride based cutting tools are used to machine cast iron from the automotive industry and nickel superalloys from the aero industries. Advances in manufacturing technologies (increased cutting speeds, dry machining, etc.) induced the fast commercial growth of physical vapor deposition (PVD) coatings for cutting tools, in order to increase their life time. In this work, a new composition of the Si3N4 ceramic cutting tool was developed, characterized and subsequently coated, using a PVD process, with aluminum chromium nitride (AlCrN). The Si3N4 substrate properties were analyzed by XRD, AFM, hardness and fracture toughness. The AlCrN coating was analyzed by AFM, grazing incidence X-ray diffraction (GIXRD) and hardness. The results showed that this PVD coating could be formed homogeneously, without cracks and promoted a higher surface hardness to the insert and consequently it can produce a better wear resistance during its application on high speed machining.

APA, Harvard, Vancouver, ISO, and other styles

20

Zou, B., C. Z. Huang, H. L. Liu, and M. Chen. "Preparation and characterization of Si3N4/TiN nanocomposites ceramic tool materials." Journal of Materials Processing Technology 209, no. 9 (May 2009): 4595–600. http://dx.doi.org/10.1016/j.jmatprotec.2008.10.025.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Krbata, Michal, Maros Eckert, Jozef Majerik, and Igor Barenyi. "Wear Behaviour of High Strength Tool Steel 90MnCrV8 in Contact with Si3N4." Metals 10, no. 6 (June 6, 2020): 756. http://dx.doi.org/10.3390/met10060756.

Full text

Abstract:

Tool steels are used in technological processes of forming and cutting and as cutting tools due to their good mechanical properties. During their working cycle, steels are exposed to several aggressive conditions, such as thermal stress, fatigue and various forms of wear. In this article, the selected 90MnCrV8 tool steel slid against the Si3N4 testing ceramic bearing ball. All measurements were performed on a universal tribometric device UMT TriboLab (TA Instruments, New Castle, Delaware, USA) under dry conditions. The main objective of the performed experiments was to analyse the frictional properties and compare the wear of the 90MnCrV8 tested tool steel in contact with the 6.35 mm diameter ceramic ball at different friction speeds. In this measurement evaluation, the authors of the article mainly focused on the influence of the magnitude of the peripheral speed on the wear change and coefficient of friction. Further analysis was focused on the change of surface roughness of the counterpart ceramic balls as well as of the tested tool steel samples. Experimental results show the fact that tested tool steels, which can also be considered as high strength steels, can also successfully represent wear-resistant steels. It has been shown experimentally that increasing the friction speed also leads to significant degradation of the material on the sample surface. Finally, the effect of hardness on wear has also been experimentally demonstrated. The Si3N4 ceramic ball with its high strength also behaves like an abrasive, thus increasing the wear rate on the experimental tool steel samples.

APA, Harvard, Vancouver, ISO, and other styles

22

Zheng, Guang Ming, Jun Zhao, Xiang Cheng, and Min Wang. "Self-Sharpening Failure Characteristic of a Si₃N₄ Ceramic Tool in High Speed Cutting of Inconel 718." Key Engineering Materials 693 (May 2016): 1135–42. http://dx.doi.org/10.4028/www.scientific.net/kem.693.1135.

Full text

Abstract:

A Si3N4 ceramic tool material with high mechanical properties was fabricated by hot-pressing sintering process. The high speed machining of Inconel 718 tests were carried out with round ceramic inserts. The failure surface and microstructure were analyzed by scanning electron microscopy (SEM) to reveal the ceramic tool failure mechanisms. The results showed that the main failure mechanisms of the Si3N4 ceramic tool were flaking, micro-chipping, abrasive wear and adhesive wear in the turning process. On the other hand, chipping, flaking and adhesive wear were the main failure reasons in the milling process. Meanwhile, some small flaking along the cutting edge and step-shaped flaking on the rake face closed to the cutting edge were found on the failure surfaces, which was a typical self-sharpening failure characteristic of the ceramic tool in the high-speed cutting process. This tool failure evolution characteristic of the ceramic tool can be attributed to its higher flexural strength and fracture toughness, which was beneficial to improve the tool life and was constrained by cutting conditions.

APA, Harvard, Vancouver, ISO, and other styles

23

Morozow, Dmitrij, Zbigniew Siemiątkowski, Edwin Gevorkyan, Mirosław Rucki, Jonas Matijošius, Artūras Kilikevičius, Jacek Caban, and Zbigniew Krzysiak. "Effect of Yttrium and Rhenium Ion Implantation on the Performance of Nitride Ceramic Cutting Tools." Materials 13, no. 20 (October 21, 2020): 4687. http://dx.doi.org/10.3390/ma13204687.

Full text

Abstract:

In the paper, the results of experimental investigations of ion implanted cutting tools performance are presented. The tools, made out of Si3N4 with additives typically used for turning of Ti-6Al-4V alloy, underwent implantation with ions of yttrium (Y+) and rhenium (Re+) using the metal vapor vacuum arc method. Distribution of ions on the tool surface was measured. The cutting tools were tested in turning process with measurement of cutting forces and analysis of wear. A rather unexpected result was the increased wear of the tool after Y+ implantation with 1 × 1017 ion/cm2. It was demonstrated, however, that the tool after Y+ 2 × 1017 ion/cm2 ion implantation provided the best machining performance.

APA, Harvard, Vancouver, ISO, and other styles

24

Yang, Guo Dong, Bin Shen, Fang Hong Sun, Zhi Ming Zhang, and Ming Chen. "Study on the Fabrication and Cutting Performance of HFCVD Diamond Coated Silicon Nitride Inserts." Key Engineering Materials 431-432 (March 2010): 515–18. http://dx.doi.org/10.4028/www.scientific.net/kem.431-432.515.

Full text

Abstract:

Microcrystalline diamond (MCD) and fine-grained diamond (FGD) films are deposited on silicon nitride (Si3N4) inserts using the hot filament chemical vapor deposition (HFCVD) method. Scanning electron microscope (SEM), X –ray diffraction (XRD) and Raman spectrum are employed to characterize these as-deposited diamond films. Cutting performance of as-fabricated CVD diamond coated Si3N4 inserts is examined in dry turning glass fiber reinforced plastics (GFRP) material, comparing with the uncoated Si3N4 inserts. The results indicate that the tool failure is mainly attributed to its severe flank wear, which is caused by continuous friction and impact brought by many hard SiO2 particles distributed in the GFPR work piece. The lifetime of Si3N4 inserts can be prolonged by depositing MCD or FGD films on them and the FGD coated insert shows better wear resistance than the MCD coated one.

APA, Harvard, Vancouver, ISO, and other styles

25

ZOU, B., C. HUANG, M. CHEN, M. GU, and H. LIU. "Study of the mechanical properties, toughening and strengthening mechanisms of Si3N4/Si3N4w/TiN nanocomposite ceramic tool materials." Acta Materialia 55, no. 12 (July 2007): 4193–202. http://dx.doi.org/10.1016/j.actamat.2007.03.016.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Guo, X. L., P. X. Cao, H. N. Liu, Y. Teng, Y. Guo, and H. Wang. "Tribological Properties of Ceramics Tool Materials in Contact with Wood-Based Materials." Advanced Materials Research 764 (September 2013): 65–69. http://dx.doi.org/10.4028/www.scientific.net/amr.764.65.

Full text

Abstract:

Tribological properties of ceramic cutting tool materials in contact with wood based materials were studied in this paper by examining how Al2O3-ceramics and Si3N4-ceramics behave in dry sliding experiment in contact with wood-based materials and by comparing their behavior with tungsten carbide material at the same time. It had been found that the ceramics exhibited much better tribological properties than tungsten carbide material, and Si3N4-ceramic performed better than Al2O3-ceramics. The Al2O3-ceramics with an addition of ZrO2 had better tribological performance than the common Al2O3-ceramics in contact with wood-based materials. The tungsten carbide had better tribological performance than ceramics in tribological contact with wood flour/PE material. A well-marked difference occurred in various cutting materials/MDF frictional pair, but the differences in various cutting materials/PB frictional pair were insignificant. An increase of the normal force didn’t result in any significant decrease of the friction coefficient. An addition of ZrO2 in the Al2O3-ceramics could inhabit corrosive wear.

APA, Harvard, Vancouver, ISO, and other styles

27

Huang, Hai Xia, Yi Hua Feng, Fu Meng Li, and Hao Sun. "Research Progress of Al₂O₃ Based and Si₃N₄ Based Ceramic Tool Materials." Advanced Materials Research 900 (February 2014): 130–33. http://dx.doi.org/10.4028/www.scientific.net/amr.900.130.

Full text

Abstract:

In this paper, the sorts, mechanical property, strengthening and toughening mechanism of ceramic cutting tool materials were summarized in the present study, especially the Si3N4 based nanocomposite and Al2O3 based ceramic cutting tool materials. The problems to be solved in the field were suggested. It would act as the foundation in the future research of ceramic cutting tool materials.

APA, Harvard, Vancouver, ISO, and other styles

28

Dobrzański, Leszek Adam, and Daniel Pakuła. "Structure and Properties of the Wear Resistant Coatings Obtained in the PVD and CVD Processes on Tool Ceramics." Materials Science Forum 513 (May 2006): 119–34. http://dx.doi.org/10.4028/www.scientific.net/msf.513.119.

Full text

Abstract:

The paper presents investigation results of structure and functional properties of the hard wear resistant coatings obtained in the PVD and CVD processes on the Si3N4 nitride tool ceramics. Examinations of coatings structures were made using the transmission (TEM) and scanning (SEM) electron microscopes, microhardness tests, coating adhesion to the substrate with the „scratch test”, and the coatings abrasive resistance „pin-on-disc” test. Machining tests results and roughness tests results for the machined grey cast iron surface are also presented. The research carried out proved that depositing the hard, anti wear, multilayer coatings based on the Al2O3 and TiN layers onto the Si3N4 nitride tool ceramics with the PVD method results in obtaining better functional properties like extension of the cutting tool life, than in case of the uncoated nitride ceramics or coated with the PVD coatings and some CVD ones.

APA, Harvard, Vancouver, ISO, and other styles

29

Hakeem, Abbas Saeed, Raja Muhammad Awais Khan, Moath Mohammad Al-Malki, Faheemuddin Patel, Akolade Idris Bakare, Sadaqat Ali, Stuart Hampshire, and Tahar Laoui. "Development and Processing of SiAlON Nano-Ceramics by Spark Plasma Sintering." Advances in Science and Technology 89 (October 2014): 63–69. http://dx.doi.org/10.4028/www.scientific.net/ast.89.63.

Full text

Abstract:

The development of SiAlON-based ceramics has shown great impact in the field of cutting/drilling tool industry and other engineering applications. It is highly desirable to cut-down the cost of the cutting tools by increasing their service lifetime. Potential ways to improve tool life is by preparing these SiAlON-based ceramics adopting non-conventional synthesis routes and by using different precursors. The present study reports the results of synthesis of SiAlON-based nano-ceramics via spark plasma sintering (SPS) technique. Generally, metal nitride and metal oxide precursors are used for synthesizing self-reinforced SiAlON ceramics. In this work, nano-sized metallic precursors including amorphous-Si3N4 and crystalline β-Si3N4, SiO2, AlN and Al2O3 were used, which could be a novel way to synthesize SiAlONs at low temperatures with enhanced performance. The properties of these SiAlONs are tailored by optimizing the synthesis parameters. The synthesized samples were characterized by X-ray diffraction and field emission scanning electron microscopy to study the effect of processing parameters on microstructure, density and hardness.

APA, Harvard, Vancouver, ISO, and other styles

30

Liu, Chien-Cheng. "Microstructure and tool electrode erosion in EDMed of TiN/Si3N4 composites." Materials Science and Engineering: A 363, no. 1-2 (December 2003): 221–27. http://dx.doi.org/10.1016/s0921-5093(03)00630-0.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Caliskan, Fatih, Zafer Tatli, Serkan Kilic, and Hakki Sonmez. "Investigation on Cutting Tool Performance of α-Si3N4 - β SiAlON Ceramics." Academic Platform Journal of Engineering and Science 2, no. 2 (2014): 7–12. http://dx.doi.org/10.5505/apjes.2014.08370.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Wei, Shi-Liang, Yun-Feng Liu, Li-Fei Liu, and Hong Zhao. "Investigation on tool wear process of milling wave-transmitting Si3N4 ceramics." Materials and Manufacturing Processes 34, no. 5 (January 13, 2019): 521–29. http://dx.doi.org/10.1080/10426914.2019.1566620.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Bai, Xiaolan, Chuanzhen Huang, Jun Wang, Bin Zou, and Hanlian Liu. "Fabrication and characterization of Si3N4 reinforced Al2O3-based ceramic tool materials." Ceramics International 41, no. 10 (December 2015): 12798–804. http://dx.doi.org/10.1016/j.ceramint.2015.06.115.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Xu, Weiwei, Zengbin Yin, Juntang Yuan, and Guodong Yan. "Reliability prediction of a microwave sintered Si3N4-based composite ceramic tool." Ceramics International 47, no. 12 (June 2021): 16737–45. http://dx.doi.org/10.1016/j.ceramint.2021.02.244.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Salpagarov, Eldar M., Andrey A. Belyakov, and Aleksei V. Sivenkov. "Improvement of Mechanical Properties of the Tool Using Nanocomposite Coatings." Materials Science Forum 1040 (July 27, 2021): 68–74. http://dx.doi.org/10.4028/www.scientific.net/msf.1040.68.

Full text

Abstract:

The main purpose of this work is to study and evaluate the mechanical properties of nanocomposite coatings based on metal-ceramics. The research also estimates factors affecting the unique properties of these surface coatings. The study compares the physical and mechanical properties of tool material plates with a nanodispersed multilayer composite coating and analyzes the results of mechanical tests with and without these coverings. The results of the investigation show that nanocomposite coatings contribute to hardness, strength and wear resistance more than three times, while traditional hardening methods, such as thermal and chemical-thermal treatment, improve the mechanical properties much less. It can be concluded that nanocomposite coatings can increase the strength resource of the tool. Their main disadvantage is the individuality of the properties of each coating and the need for expensive equipment for their creation and application. In the use of nanocomposite coatings to increase surface properties, multicomponent coatings are of the greatest interest. As a result of this work, the nanocomposite metal coating of the nc-TiN/a-Si3N4 system was studied, the dependence of properties on the content of the nc-TiN and a-Si3N4 phases was examined, and the optimal ratio was found which ensured the highest values of hardness with the best wear resistance.

APA, Harvard, Vancouver, ISO, and other styles

36

Panov, V. S. "Cemented carbide cutting tools coated with silicon nitride." Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional’nye Pokrytiya (Universitiesʹ Proceedings. Powder Metallurgy аnd Functional Coatings), no. 4 (December 15, 2018): 104–9. http://dx.doi.org/10.17073/1997-308x-2018-4-104-109.

Full text

Abstract:

The paper describes the technology of producing a wear resistant silicon nitride coating on cemented carbide cutting tools and factors affecting its structure and thickness. A review of domestic and foreign authors’ works is given on the properties and applications of cemented carbides in cutting, drilling, die stamping tools, wear resistant materials, for chipless processing of wood, plastics. It is noted that one of the promising ways of cutting tool development is using indexable throwaway inserts (ITI) with wear resistant coatings. The choice of silicon nitride as a material for cemented carbide tool coating is justified. The data on silicon nitride deposition methods, investigation of cutting tool structures and properties are provided. Laboratory and factory tests of Si3N4-coated cemented carbide tools demonstrated coating applicability in improving the wear resistance and lifetime of cutting inserts.

APA, Harvard, Vancouver, ISO, and other styles

37

Ariff, Tasnim Firdaus, Nurul Syamira Shafie, and Zamzahariah Mahamad Zahir. "Wear Analysis of Silicon Nitride (Si₃N₄) Cutting Tool in Dry Machining of T6061 Aluminium Alloy." Applied Mechanics and Materials 268-270 (December 2012): 563–67. http://dx.doi.org/10.4028/www.scientific.net/amm.268-270.563.

Full text

Abstract:

Dry machining is an eco-friendly machining process and its importance in the manufacturing industries should be taken seriously. Machining without the use of any cutting fluid is becoming increasingly more popular due to concerns regarding the safety of the environment and reducing cost. Dry and wet turning of T6061 aluminium alloy was performed on a lathe by using Silicon Nitride (Si3N4) inserts as the cutting tool. Tool wear behaviour of Si3N4 cutting tool were studied with the aim of finding the optimum cutting conditions for both dry and wet machining. Machining was performed at four different cutting speeds; 292, 388, 518 and 689 m/min using two different cutting parameters (feed rate, f = 0.2 mm/rev, depth of cut, d = 0.1 mm and f = 0.4 mm/rev, d = 0.2 mm). Material removal rate (MRR) was also obtained and the temperature at the tool-chip interface were measured using an infrared (IR) thermometer as to see the effect of temperature rise during machining. Dry machining with smaller cutting parameters resulted in lower wear rates by 37 to 48% for all four cutting speeds. Nevertheless, reduction of wear rate by 38 to 57% was found from wet machining. The optimum cutting speed for both dry and wet machining of T6061 aluminium alloy using Si3N4 cutting tool was found to be 518 m/min for both cutting parameters. However, the optimum cutting parameters are apparently with the feed rate of 0.4 mm/rev and depth of cut of 0.2 mm. At the optimum cutting speed, the tool tip temperature for dry machining was higher than wet machining by 40 and 51% for f = 0.2 mm/rev and f = 0.4 mm/rev respectively. Dry machining of T6061 Aluminium alloy can be more suitable particularly at higher cutting speed with interrupted cutting operations.

APA, Harvard, Vancouver, ISO, and other styles

38

Zou, Bin, Chuanzhen Huang, and Ming Chen. "Study on the mechanical properties, microstructure and oxidation resistance of Si3N4/Si3N4W/Ti(C7N3) nanocomposites ceramic tool materials." International Journal of Refractory Metals and Hard Materials 27, no. 1 (January 2009): 52–60. http://dx.doi.org/10.1016/j.ijrmhm.2008.03.003.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

Górny, Gabriela, Roman Pampuch, Ludosław Stobierski, and Paweł Rutkowski. "Ceramic Tool Materials for High Speed Cutting Process." Advances in Science and Technology 65 (October 2010): 56–60. http://dx.doi.org/10.4028/www.scientific.net/ast.65.56.

Full text

Abstract:

Frictional and mechanical properties of hot-pressed Al2O3 and Si3N4 - matrix composites containing up to 5 vol. % hexagonal BN as a solid lubricant. A very low coefficient of friction which is necessary for high-speed cutting has been observed. Fracture toughness remained constant with increase of h-BN content while flexural strength changes with the hBN content have been found to depend upon the material homogeneity. The work has been supported by EU Funds in Poland under contract UDA-POIG.01.03-12-024/08-00.and has been realized in the frame of scientific-industrial consortium.

APA, Harvard, Vancouver, ISO, and other styles

40

Pfeifer, Judit, Enikõ Horváth, Zófia Vértesy, Péter Arató, and Csaba Balázsi. "Chemical Methods for Scanning Electron Microscope Characterization of Non-Oxide Ceramics and Composites." Key Engineering Materials 409 (March 2009): 382–85. http://dx.doi.org/10.4028/www.scientific.net/kem.409.382.

Full text

Abstract:

The deformation of ceramic matrix composites (CMC) is controlled by several processes occurring in the matrix, in the enforcing phase, at the interfaces between different phases and at the surface of the body. The main tool to study morphology features of CMC-s is high resolution scanning electron microscopy (SEM). In this study destructive chemical methods such as chemical etching and burning of combustible phases were used to prepare samples for SEM investigations from three types of materials. I. SiC skeletons of C/C-SiC structures prepared of 2D woven fabric and chopped fiber bodies were produced by chemical elimination of the constituents: Si, reinforcing C- fibers and amorphous carbon. II. Silicon-nitride reaction bonded silicon-carbide samples with finishing surface oxide films – as produced and aged - were handled by HF etchants. Etching revealed cristobalite crystallites at the interface between ceramics and oxide film, and cracks in the glassy surface layer. III. Microstructure and pore structure of Si3N4 ceramics, carbon nanotube reinforced Si3N4 (CNT/Si3N4), and C/Si3N4 with graphite and carbon black addition were examined by HF etching.

APA, Harvard, Vancouver, ISO, and other styles

41

Furuya, Satoshi, Nobuaki Ozoe, and Yasuo Yamane. "Generation of Wear Protective Layer in High Speed Turning of Gray Cast Iron Containing Aluminium and Magnesium." Key Engineering Materials 407-408 (February 2009): 500–503. http://dx.doi.org/10.4028/www.scientific.net/kem.407-408.500.

Full text

Abstract:

This paper focuses on the influence of difference of tool materials on generation of wear protective layer when turning gray cast iron containing Al and Mg. In this experiment, the gray cast iron to which small quantities of Al and Mg was added were cut with cermet, P grade carbide (P10), silicon nitride ceramics (Si3N4), titanium nitride (TiN) coated carbide and K grade carbide (K10) at high speed. In turning gray cast iron containing Al and Mg with cermet, the tool wear was significantly reduced compared to that resulting from the cutting of conventional gray cast iron. Further, the protective layer consisting of nonmetallic inclusions in the work material was formed on the tool surface. In addition to cermet, this layer was formed on tool surface of Si3N4 and TiN coated carbide. The elements of Al and Mg added to the work materials were detected in the layers formed on these tool surfaces as well as cermet. The inhibiting effect on tool wear was also caused when turning with P10. However, P10 had much greater wear than cermet. On the other hand, in the case of turning with K10, the effect reducing wear with the addition of Al and Mg was not caused. The wear increased as cutting speed increased regardless of work materials.

APA, Harvard, Vancouver, ISO, and other styles

42

Zheng, Guang Ming, Jun Zhao, Yong Hui Zhou, and Zhong Jun Gao. "Preparation and Characterization of Si₃N₄/TiCN Composite Ceramic Tool Material." Advanced Materials Research 152-153 (October 2010): 500–503. http://dx.doi.org/10.4028/www.scientific.net/amr.152-153.500.

Full text

Abstract:

Si3N4-based composite ceramic tool materials reinforced with TiC0.5N0.5 particles were fabricated by using hot-press-sintering technique with Al2O3 and Y2O3 as sintering aids. The effects of the content of TiC0.5N0.5 on the microstructure and properties of composite ceramic were investigated. The experimental results show that optimal mechanical properties were achieved for the composite with the addition of 20 vol.% TiC0.5N0.5 microparticles, with the flexural strength, fracture toughness and Vicker's hardness being 838 MPa, 8.5 MPa•m1/2 and 15.6 GPa. The fracture surface microstructure of the composites is characterized by scanning electron microscopy (SEM). Phase identification was carried out by X-ray diffraction (XRD). It was found that the microstructure of the material was homogenous and the elongated grain of β-Si3N4 was interlaced. And the fracture surfaces were observed to exhibit a mix of intergranular and transgranular fracture.

APA, Harvard, Vancouver, ISO, and other styles

43

Kübler, Jakob, Fernando Eblagon, Thomas Graule, and Bruno Ehrle. "Development of Ceramic Composites for Industrial Wood-Cutting Tools." Key Engineering Materials 368-372 (February 2008): 1062–67. http://dx.doi.org/10.4028/www.scientific.net/kem.368-372.1062.

Full text

Abstract:

Industrial wood cutting is a highly demanding application for cutting tool materials as a wedge angle of ~50°, a tip radius in the 1 m range, and high wear, temperature and corrosion resistance are needed. For this application Si3N4 based ceramic matrix composites (CMC) were developed. Cutting tests showed that reinforcing Si3N4 with 30 wt.% SiC gives a good balance between fracture toughness and wear resistance. The use of an yttria / lanthana sintering aid system resulted in a fine-grained microstructure without degrading the fracture toughness. Post heat treatment was essential for the integrity of the cutting edge. Finally, cutting tests proved that the CMC cutting tips had a 3-fold lifetime compared to tungsten carbide.

APA, Harvard, Vancouver, ISO, and other styles

44

Tshabalala, Lerato Criscelda, and Sisa Pityana. "Surface texturing of Si3N4–SiC ceramic tool components by pulsed laser machining." Surface and Coatings Technology 289 (March 2016): 52–60. http://dx.doi.org/10.1016/j.surfcoat.2016.01.028.

Full text

APA, Harvard, Vancouver, ISO, and other styles

45

Oliveira, F. J., R. F. Silva, and J. M. Vieira. "Improved wear resistance of Si3N4 tool inserts by addition of Al2O3 platelets." Tribology International 36, no. 1 (January 2003): 57–60. http://dx.doi.org/10.1016/s0301-679x(02)00131-7.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

Zheng, G. M., J. Zhao, Y. H. Zhou, Z. J. Gao, X. B. Cui, and A. H. Li. "Fabrication and characterization of Sialon–Si3N4 graded nano-composite ceramic tool materials." Composites Part B: Engineering 42, no. 7 (October 2011): 1813–20. http://dx.doi.org/10.1016/j.compositesb.2011.07.007.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Marrocco, Valeria, Francesco Modica, Vincenzo Bellantone, Valentina Medri, and Irene Fassi. "Pulse-Type Influence on the Micro-EDM Milling Machinability of Si3N4–TiN Workpieces." Micromachines 11, no. 10 (October 13, 2020): 932. http://dx.doi.org/10.3390/mi11100932.

Full text

Abstract:

In this paper, the effect of the micro-electro discharge machining (EDM) milling machinability of Si3N4–TiN workpieces was investigated. The material removal rate (MRR) and tool wear rate (TWR) were analyzed in relation to discharge pulse types in order to evaluate how the different pulse shapes impact on such micro-EDM performance indicators. Voltage and current pulse waveforms were acquired during micro-EDM trials, scheduled according to a Design of Experiment (DOE); then, a pulse discrimination algorithm was used to post-process the data off-line and discriminate the pulse types as short, arc, delayed, or normal. The analysis showed that, for the considered process parameter combinations, MRR was sensitive only to normal pulses, while the other pulse types had no remarkable effect on it. On the contrary, TWR was affected by normal pulses, but the occurrence of arcs and delayed pulses induced unexpected improvements in tool wear. Those results suggest that micro-EDM manufacturing of Si3N4–TiN workpiece is relevantly different from the micro-EDM process performed on metal workpieces such as steel. Additionally, the inspection of the Si3N4–TiN micro-EDM surface, performed by SEM and EDS analyses, showed the presence of re-solidified droplets and micro-cracks, which modified the chemical composition and the consequent surface quality of the machined micro-features.

APA, Harvard, Vancouver, ISO, and other styles

48

Telle, Rainer, Simon Muenstermann, and Christophe Beyer. "Design, Construction and Performance of Silicon Nitride Tool Parts in Steel Thixoforming." Solid State Phenomena 116-117 (October 2006): 690–95. http://dx.doi.org/10.4028/www.scientific.net/ssp.116-117.690.

Full text

Abstract:

The design and performance of silicon nitride (Si3N4) dies for the semi-solid processing of steels is studied by the example of a punch and a lower swage in upset forging. The observed failure mechanisms and degradation effects are related to short-term effects resulting from mechanical and thermal loads and long-term effects owing to chemical and tribological attack. Results show that well-defined process conditions (cycle time, solidification time in the die) and a ceramic-suitable design are a pre-requisite for reliability and sufficient service life of ceramic dies.

APA, Harvard, Vancouver, ISO, and other styles

49

Yordanov, Boyan, and Dimitar Krastev. "Investigations of Plasma-Chemically Produced Nanodispersed Si₃N₄ for Modification of Tool Steels." Solid State Phenomena 159 (January 2010): 167–70. http://dx.doi.org/10.4028/www.scientific.net/ssp.159.167.

Full text

Abstract:

The nanodispersed nitrides are applied in various technological and industrial fields. One of them is the use for modification of special steels and alloys. Results from metallographic investigation on the microstructure and properties of the alloyed in nitrogen tool steel, type X210Cr12 after modification with nanodispersed Si3N4 are presented in this paper.

APA, Harvard, Vancouver, ISO, and other styles

50

Ohtsuka, Shigehiro, Yutaka Sekiguchi, Shigemi Tochino, and Giuseppe Pezzotti. "Estimation of Residual Stress in a Ceramic Coating Layer." Key Engineering Materials 317-318 (August 2006): 289–92. http://dx.doi.org/10.4028/www.scientific.net/kem.317-318.289.

Full text

Abstract:

We attempted to characterize by Raman piezo-spectroscopy residual stresses as they develop in chemical vapor deposition (CVD) Al2O3 coatings on Si3N4 ceramic substrates. According to a piezo-spectroscopic procedure coupled with a confocal configuration of the optical probe used, two-dimensional stress maps could be collected at various depths along the thickness of the coating. By comparing Al2O3 coatings produced on Si3N4 substrates at different CVD temperatures, a tensile residual stress field has been detected in the coating, whose magnitude increased with increasing the CVD temperature. As for the three-dimensional distribution of tensile residual stress within the Al2O3 coating, it was found that the stress value was minimum at the coating external surface, while it gradually increased to reach a maximum near the coating/substrate interface. Similarly, the compressive stress within the Si3N4 substrate was maximized near the coating/substrate interface and decreased with proceeding towards the substrate material bulk. It could be concluded that confocal Raman piezo-spectroscopy is a very suitable tool for three-dimensional stress characterization of ceramic coating materials.

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Si3N4 tool'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles