材料科学
陶瓷
氮化硅
热冲击
赛隆
复合材料
烧结
热导率
威布尔模量
断裂韧性
热膨胀
氮化物
热扩散率
韧性
冶金
硅
图层(电子)
物理
量子力学
作者
Mikio Fukuhara,Kenji Fukazawa,Akira Fukawa
出处
期刊:Wear
[Elsevier BV]
日期:1985-04-01
卷期号:102 (3): 195-210
被引量:98
标识
DOI:10.1016/0043-1648(85)90218-2
摘要
Silicon nitride, a nitrogen compound of highly covalent bond character, has low density, high hardness, low thermal expansion and high thermal conductivity and excellent oxidation and corrosion resistance. Therefore it is considered to be a promising material for high temperature engineering components. However, it has very poor sinterability compared with the conventional oxide ceramics owing to its low self-diffusivity. By investigating starting materials, sintering additives and processing, a hot-pressed silicon nitride ceramic having grains enveloped by crystalline boundary phases can be produced. The silicon-nitride-based ceramic has high strength, high Weibull modulus, fracture toughness and thermal conductivity, and low thermal expansion compared with existing cutting tool ceramics such as Al2O3 + TiC, and it is expected to have superior thermal shock resistance. This new ceramic cutting tool shows superior performance in cutting cast irons at high speeds (10–16.75 m s−1 (600–1000 m min−1)) and rates (about 1.0 mm rev−1), where conventional tools cannot be used.
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