【作者】 周湘文； 侯明栋； 刘荣正； 刘兵； 唐亚平；

【Author】 ZHOU Xiang-wen;HOU Ming-dong;LIU Rong-zheng;LIU Bing;TANG Ya-ping;Institute of Nuclear and New Energy Technology of Tsinghua University;

【机构】 清华大学核能与新能源技术研究院；

【摘要】 本文采用热压烧结方法在真空环境下制备氧化铍陶瓷。在热压烧结过程中,使用石墨模具制备氧化铍会使模具中的碳元素扩散至氧化铍中,所制备的氧化铍外观呈现黑色并伴有石墨光泽。因此,热压烧结所制备的氧化铍需经进一步的脱碳工艺处理,以实现基本完全脱碳。由此,经过真空热压烧结+脱碳两步工艺制备了达到理论密度约94%以上的氧化铍陶瓷。同时,本文还对碳元素在氧化铍中的扩散路径进行了研究。结果表明,碳元素主要沿着氧化铍晶粒之间的玻璃相扩散,但也存在一部分碳元素扩散至氧化铍晶粒内部,并可能伴随Be-C化学键的形成。更多还原

【Abstract】 In this study, beryllium oxide ceramics were prepared using the hot pressing and sintering method in a vacuum environment.Graphite molds were employed during the process,leading to the diffusion of carbon elements into the beryllium oxide,resulting in a graphite appearance.However,further decarbonization processes were necessary to achieve complete decarbonization of the beryllium oxide.Successfully, beryllium oxide ceramics with a theoretical density exceeding 94% were developed through vacuum hot pressing and sintering,followed by decarbonization.Additionally,the study investigated the carbon diffusion path in beryllium oxide,revealing that carbon primarily migrates along the glass phase between beryllium oxide grains.Some carbon may also enter into the beryllium oxide grains,potentially resulting in the formation of Be-C chemical bonds.更多还原