立方氮化硅的冲击波合成实验研究

以α-Si₃N₄粉体作原材料, 采用炸药爆轰平面飞片加载 装置和样品回收技术进行了冲击波合成实验, 完整回收到合成样品, 经过酸处理, 对回收样品进行X射线衍射分析, 结果表明: 当加载压力超过50GPa而且冲击温度约3600～5000K时, α-Si₃N₄可以较完全地转化为γ-Si₃N₄. 本实验的研究结果建立了一种冲击压缩技术可单次合成克量级的立方氮化硅, 为进一步开展立方氮化硅的性能研究奠定了基础.

Experimental Research on Shock Synthesis of Cubic Silicon Nitride

Experiments using a planar metal disc flyer driven by explosives and a cylindrical chamber was designed to synthesize cubic silicon nitride with the mixtures of α-Si₃N₄ and copper powders as starting materials. Shockcompressed samples were successfully recovered. The recovered samples were nitrated to resolve copper, and the separated silicon nitride powders were analyzed by XRD. The results indicate that most of α- Si₃N₄ are transformed into cubic silicon nitride when a shock pressure larger than 50GPa and a matched shock temperature simultaneously load on α-Si₃N₄. The experiments provide a shock compression technique that can synthesize cubic silicon nitride in the order of gram mass in one test run, which lay the foundation for conducting further investigation on the properties and performance of cubic silicon nitride.