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Oxidation Behavior of WC-TiC-TaC Binderless Cemented Carbide under Low Partial Pressure of Oxygen
Uchiyama Yasuo,Ueno Shuji,Sano Hideaki,Tanaka Hiroki,Nakahara Kenji,Sakaguchi Shigeya,Nakano Osamu 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
WC-TiC-TaC binderless cemented carbide was oxidized under low partial pressure of oxygen (50ppm) at 873K for 1 to 20 h. Surface roughness was measured using atomic force microscope, and effect of TiC amount on oxidation behavior of the carbide was investigated. WC phase was oxidized more easily than WC-TiC-TaC solid solution phase. With an increase in TiC amount, WC-TiC-TaC phase increased and the oxidation resistance of the carbide increased.
Nagano Mituyoshi,Sano Hideaki,Sakaguchi Shigeya,Zheng Guo Bin,Uchiyama Yasuo 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
In order to clarify the wear resistance as cutting tools, the effect of oxygen addition on oxidation behavior of the β-Si3N4 ceramics with 5 mass% Y2O3 and 2 or 4 mass% Al2O3 was investigated by performing oxidation tests in air at 1300° to 1400°C and cutting performance tests. From test results, we could conclude that the mechanical properties of β-Si3N4 ceramics depending on oxygen introduction are much effective on cutting performance improvements of β-Si3N4 ceramics.
Effect of TiC Content on Oxidation Behavior of Sintered WC-TiC-TaC Alloys
Tanaka Hiroki,Mouri Shigeki,Nakahara Kenji,Sano Hideaki,Zheng Guo Bin,Uchiyama Yasuo 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
The effect of TiC content on oxidation behavior of the sintered WC-TiC-TaC alloys with 2 mass% TaC and different TiC amounts of 3-45 mass% was investigated through oxidation tests in air at 973K. As a result of the tests, it was revealed that with increasing TiC content in the alloys, mass changes caused by oxidation and thickness of the scale decreased. Thus, it is considered that the main component of the scales changed gradually from to with increasing TiC content in the alloys, and oxygen diffusion through the scale to the alloys was inhibited gradually.