Microstructure evolution in bulk hafnium diboride ceramics prepared by spark plasma sintering in flash regime was compared with conventional spark plasma sintering. The conventional and flash spark plasma sintering resulted in ceramics with a high relative density exceeding 96% of their theoretical density. A remarkably fine grain size distribution was noticed for the specimen prepared in the flash regime. This atypical microstructure evolution provides a possible insight into the mechanism of flash sintering for conductive bulks. The room temperature flexural strength of the hafnium diboride processed by flash SPS was 650 MPa which is 140 MPa higher than the sample produced by conventional SPS.

比较了通过闪光等离子体火花等离子体烧结制得的块状二硼化ha陶瓷的微观结构演变与常规火花等离子体烧结的比较。常规和闪光火花等离子体烧结导致陶瓷的高相对密度超过其理论密度的96％。在闪蒸状态下制备的样品观察到非常细的晶粒尺寸分布。这种非典型的微观结构演变为导电块体的快速烧结机理提供了可能的见识。通过闪速SPS处理的二硼化ha的室温弯曲强度为650 MPa，比常规SPS生产的样品高140 MPa。