摘要
直接合成了碳化硼粉，测定了其化学成分、点阵常数、平均粒径，确定了合成反应的最佳工艺参数。研究了热压烧结碳化硼体积密度的控制方法，测试了烧结体微观组织和性能。采用炉内限位法控制试样密度精度，最大偏差为理论密度（Ｔ．Ｄ．）的±２％。富碳或富硼相阻碍晶粒长大。碳化硼体积密度为９２％Ｔ．Ｄ．时，其各项性能达到或超过反应堆工作性能要求指标。从室温升到６００°Ｃ，其抗弯强度约下降１０％。
The boron carbide powder is synthesized directly and its composition,lattice constant and mean particle size are measured,the optimum technological parameters of synthetic reaction are determined experimentally. The volume density control method of hot pressing sintering boron carbide are studied ,and its microstructure and properties are tested. The maximal deviation of volume density of sintering boron carbide is ±2% of theory density(T.D.),when position limitation piece in the furnace is used to control the piece density precision.The various property indexes of the sintered boron carbide with 92% T.D.of volume density can reach or exceed the various reference values required by the performance of reactor. The bending strength of the sintered piece gets about 10% lower when temperature increases from normal temperature to 600 °C.
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
1997年第5期400-407,共8页
Atomic Energy Science and Technology
基金
国家"863"计划项目
关键词
碳化硼
直接合成法
热压烧结
反应堆
控制棒
Boron carbide Direct synthesis method Hot pressing sintering Density precision High temperature property
