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OALib Journal期刊
ISSN: 2333-9721
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冲击波合成立方氮化硅粉体的耐腐蚀性及热稳定性
Abstract:
以α-Si3N4为原料,采用冲击波法合成了γ-Si3N4粉体。在1660～1690K温度下对γ-Si3N4粉体进行高温稳定性研究并利用氢氟酸对γ-Si3N4粉体进行耐腐蚀性研究。结果表明真空条件下,在1660K时,γ-Si3N4粉体较为稳定;在1680K时,保温10min和30min后,γ-Si3N4向β-Si3N4的转变率分别为5%和90%。在1690K时,γ-Si3N4在10min内能够完全转变为β-Si3N4。在470K的温度下γ-Si3N4粉体能够与氢氟酸缓慢反应。在490K的温度下,0.2gγ-Si3N4粉体腐蚀5h后,能够与氢氟酸完全反应,生成气体而挥发。
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