Journal of the Ceramic Society of Japan (日本セラミックス協会学術論文誌)
Online ISSN : 1882-1022
Print ISSN : 0914-5400
ISSN-L : 0914-5400
論文
Mo5Si3-Si3N4複合材料の滑り摩耗と固体粒子エロージョン特性
飯塚 建興北 英紀平井 岳根大角 和生
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2003 年 111 巻 1300 号 p. 919-923

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Silicon nitride (Si3N4) matrix composites reinforced with 1.5-8.1mass% Mo5Si3 particles were fabricated by sintering molybdenum solution-infiltrated porous Si3N4 at 1850°C in nitrogen atmosphere, and the sliding wear and solid particle erosion behaviors of the Mo5Si3-Si3N4 composites were evaluated. During sliding wear, the formation of an adherent layer on wear scar of Mo5Si3-Si3N4 composite was inhibited, and the frictional resistance reduced compared with Si3N4 due to the self-lubricant effect of the Mo5Si3 particle. The friction coefficients of Mo5Si3-Si3N4 composites were in the range of 0.52-0.58, -6-16% lower than that of Si3N4. The specific wear rate of the Mo5Si3-Si3N4 composite decreased with decreasing content of Mo5Si3 particle, and was 0.61×0-8mm2/N for the 8.1mass% Mo5Si3-Si3N4 composite, lower than that of Si3N4 by -50%. As for solid particle erosion, when Mo5Si3 particles of 2mass% or less were incorporated into Si3N4, remarkably better wear resistance than Si3N4 was shown. However, when a large fraction of Mo5Si3 particle was incorporated, the erosion rate was higher than that of the Si3N4, and increased with increasing content of Mo5Si3. This was due to the lower values of both fracture toughness and hardness of the composites.

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© 2003 The Ceramic Society of Japan
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