Physical properties and cutting performance of silicon nitride ceramic
Physical properties and cutting performance of silicon nitride ceramic
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DOI：
10.1016/0043-1648(85)90218-2
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发表时间：
1985-04
期刊：
影响因子：
5
通讯作者：
M. Fukuhara;Fukazawa Kenji;Akira Fukawa
中科院分区：
文献类型：
--
作者：
M. Fukuhara;Fukazawa Kenji;Akira Fukawa
氮化硅是一种具有高度共价键特征的氮化合物，具有低密度、高硬度、低热膨胀和高导热性以及优异的抗氧化性和抗腐蚀性。然而，由于自扩散系数较低，与传统氧化物陶瓷相比，它的烧结性能较差。通过研究原料、烧结添加剂和工艺，可以制备具有被晶界相包裹的晶粒的热压氮化硅基陶瓷，该氮化硅基陶瓷与现有的切削工具陶瓷如Al 2 O 3 + TiC相比具有高强度、高威布尔模量、高断裂韧性和热导率以及低的热膨胀，这种新型陶瓷刀具在高速切削铸铁时表现出上级的性能（10-16.75 m s−1（600-1000 m min−1））和速率（约1.0 mm rev−1），无法使用传统工具。
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.