正在研制的钨极氩弧焊保护套(安培帽),是用陶瓷材料制成的。定性X射线相分析表明,它是由低温相α-Si_3N_4和高温相β-Si_3N_4组成的。考虑到它们之间存在着同素异构关系,与钢中的马氏体和奥氏体相似,所以采用测定残余奥氏体的传统方法——x射线定量相分析直接对比法进行测定,结果令人满意。文中还给出了上述两个相共36个{hhi}的反射本领,可供测定时参考。 Tungsten arc welding protective case (Ampere cap) under development is made of ceramic material. Qualitative X-ray phase analysis shows that it is composed of low-temperature phase α-Si_3N_4 and high-temperature phase β-Si_3N_4. Taking into account the existence of their allotropic relationship between the martensitic and austenitic steel similar to the determination of retained austenite by conventional methods - X-ray quantitative phase analysis of direct comparison method was measured, the results Satisfactory. The article also gives the above two phase a total of 36 {hhi} reflection skills, for the determination of reference.