The effects of sintering additives (Boron and SiC) and solid solution (TiB₂) on the densification of HfB₂-based ceramics, processed by pressureless sintering, were investigated for potential applications as advanced control rod materials. The addition of B was found to improve the densification properties of HfB₂ through removal of the oxygen contamination yet incurred unfavourable grain growth. SiC was able to further enhance the densification through a grain pinning effort, improving the microstructure. In combination with oxygen impurity removal by the addition of B, the solid solution of Ti into HfB₂ contributed to further improving the densification by reducing the particle size of HfB₂ powder, further promoting diffusion during sintering. The grain size of SiC phase was also reduced through the refinement of HfB₂ powder via solid solution. The deployment of B and SiC sintering additives, alongside TiB₂ solid solution, during pressureless sintering was found to be beneficial in the preparation of high density HfB₂-based ceramics, increasing microstructure density and enhancing mechanical properties.

研究了烧结添加剂（硼和碳化硅）和固溶体（TiB ₂）对无压烧结处理的 HfB ₂基陶瓷致密化的影响，以作为先进控制棒材料的潜在应用。发现添加 B 可通过去除氧污染来改善 HfB ₂的致密化性能，但会导致不利的晶粒生长。碳化硅能够通过晶粒钉扎努力进一步增强致密化，改善微观结构。与通过添加 B 去除氧杂质相结合，Ti 固溶于 HfB _{2 中}，通过减小 HfB ₂的粒径有助于进一步提高致密化粉末，进一步促进烧结过程中的扩散。通过固溶对HfB ₂粉末的细化，也减小了SiC相的晶粒尺寸。在无压烧结过程中，B 和 SiC 烧结添加剂以及 TiB ₂固溶体的部署被发现有利于制备高密度 HfB ₂基陶瓷，增加微观结构密度并增强机械性能。