Development of an assembly for hot dynamic compaction of powders using a converging underwater shock wave

摘要

A new system for the dynamic compaction of hard powders at an elevated temperature is developed. In the system, a converging underwater shock wave assembly is used to obtain a higher and longer shock pulse, and the use of a high temperature enhances the deformation and bonding of powders. For the compaction of high-speed steel powders, samples were successfully recovered and the high temperature experiments showed an increased melting fraction of powder surfaces and a decreased number of cracks in comparison with the experiments performed at room temperature. C-BN/TiB{sub}2 mixed powders were also compacted at a high temperature for producing ceramic composites, and the samples were successfully recovered with few voids and cracks by the use of heating.