冲击波合成立方氮化硅  

SHOCK-WAVE SYNTHESIS OF CUBIC SILICON NITRIDE

作　　者：姚怀[1] 徐巧玉[2] 唐敬友[3] 唐翠霞[3] 

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471003 [2]河南科技大学机电工程学院,河南洛阳471003 [3]西南科技大学材料科学与工程学院,四川绵阳621010

出　　处：《硅酸盐学报》2008年第1期6-10,共5页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(50472102);西南科技大学引进人才基金(ZK043030)资助项目。

摘　　要：以α-Si3N4粉体作原材料,采用平面飞片加载装置和样品回收装置进行了冲击波压缩合成实验,完整地回收到c-Si3N4,其单次合成出的c-Si3N4达到克量级。在40GPa,3600K或在65GPa,6200K的条件下,都有c-Si3N4生成;在45～55GPa,4000～4500K的条件下,c-Si3N4的转化率比较高,最高可达80%。在冲击波合成c-Si3N4的过程中,伴随着生成一定量的β-Si3N4。合成出的c-Si3N4粉体团聚体的颗粒尺寸约为1μm。An apparatus including a planar metal disc flyer and a cylindrical chamber driven by explosives was designed to shock-wave synthesize cubic silicon nitride using α-Si3N4 powders as starting materials. About 1 g c-Si3N4 can be obtained in each test using the apparatus. When the pressure was up to 40 GPa （or 65 GPa） and the temperature was 3 600 K （or 6 200 K）, c-Si3N4 can be synthesized. The ratio of transformation from α-Si3N4 to c-Si3N4 approached 80% at pressures from 45 GPa to 55 GPa and temperatures from 4 000 K to 4 500 K. In the synthesized products, a small amount of β-Si3N4 was observed. The c-Si3N4 powders obtained were conglomerated to particles of about 1 μm in size.

关 键 词：冲击压缩 平面飞片装置 立方氮化硅 合成 

分 类 号：O771[理学—晶体学]