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采用等离子旋转电极 (PREP) Ti- 5 Al- 2 .5 Sn粉末 ,经过热等静压 (HIP)工艺研究原始粉末界面在热等静压致密化过程中的变化。研究结果表明 :由于原始粉末颗粒界面存在成分偏析、氧化和杂质元素富集等 ,在致密化过程中粉末颗粒界面经历了变形、破裂、偏聚和均匀化等一系列复杂的变化过程。同时这些界面物质的存在使得材料的粉末颗粒界面结合力变差。为了避免它对材料最终性能的影响 ,合理地提高热等静压温度和延长保温时间是行之有效的方法
The change of the original powder interface during hot isostatic pressing was investigated by hot isostatic pressing (HIP) with plasma rotating electrode (PREP) Ti-5 Al-2 .5 Sn powder. The results show that due to the composition segregation, oxidation and impurity element enrichment in the interface of the original powder particles, the interface of the powder particles undergoes a series of complex changes such as deformation, rupture, segregation and homogenization during densification. At the same time, the existence of these interfacial substances makes the interface between the powder and particle of materials become worse. In order to avoid its influence on the final properties of the material, it is an effective method to increase the hot isostatic pressing temperature and extend the holding time reasonably