氮化硅超细粉原位生长“无缺陷”a—氮化硅晶须
1995
研究了用加压氮化法(increasing pressure nitridation,简称IPN法)制备高活性、高纯度的氮化硅超细粉。用这种超细粉在一定温度范围内原位生长出“无缺陷”的a-Si3N4晶须,其截面直径×长的尺寸分别为(0.1 ̄0.3um)×(10 ̄30um)。在氮化硅基体中加入“无缺陷”a-SiN4晶须后,材料的断裂韧性KIc达10.5±0.9MPa·m^1/2;室温强度afRT达92
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