Al_2O_3-B_4C弥散陶瓷芯块的研制  

Development of Al_2O_3-B_4C Dispersion Ceramics Pellets

作　　者：黄栋生[1] 吴义成[1] 吕海波[1] 侯兴民[2] 

机构地区：[1]中南工业大学粉末冶金研究所,湖南长沙410083 [2]中国核动力研究设计院,成都610005

出　　处：《核动力工程》1993年第5期433-439,共7页Nuclear Power Engineering

摘　　要：本文介绍了用不同Al_2O_3和B_4C粉末制备的Al_2O_3-B_4C弥散体压坯在不同温度下的烧结致密化过程与显微组织的变化,温度高于1600℃时,压坯发生迅速致密化,其行为主要取决于基材Al_2O_3粉末的性能。烧结过程中未发现Al_2O_3和B_4C发生化学反应,但B_4C阻碍Al_2O_3粉末的烧结。烧结过程中B_4C出现严重烧损,这主要与烧结气氛有关。研制成的Al_2O_3-B_4C弥散芯块性能符合设计要求。Sintering behaviours and microstructural transformations of Al_O_3-B_4C dispersion greencompacts have been studied emphatically. It has been found that green-compacts are caused rapidly to densification above 1600℃. These behavious are dependent on Al_2O_3 powder properties mainly. There are no chemical reactions between Al_O_3 and B_4C in Sintering process, but boron carbide suppresses the sinterability of Al_2O_3 powder. The large loss of B_4C is mainly relate to various sintering atmospheres during sintering process, According to the content of boron, Al_2O_3-B_4C dispersion pellets are made out, their properties are up to designing need.

关 键 词：氧化铝 碳化硼 陶瓷 弥散核燃料 

分 类 号：TL345[核科学技术—核技术及应用]