自蔓延高温合成固定放射性废物  

SELF-PROPAGATING HIGH TEMPERATURE SYNTHESIS OF RADIOACTIVE WASTE IMMOBILIZATION

作　　者：路新[1] 郭志猛[1] 罗上庚[2] 林涛[1] 殷声[1] 杨建文[2] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]中国原子能科学研究院,北京102413

出　　处：《硅酸盐学报》2003年第2期205-208,共4页Journal of The Chinese Ceramic Society

摘　　要：以三氧化铬 (CrO3)为氧化剂 ,采用自蔓延高温合成 (SHS)技术制备了含锶离子 (Sr2 +)的钙钛矿 (CaTiO3)化合物 ,并研究了反应产物的合成机理、微观组织和对Sr2 +的包容量。实验结果表明 :以CrO3为氧化剂 ,在SHS反应过程中 ,可获得更高的反应温度 ,由于大量的液相存在 ,可使反应在瞬间完成 ,而且所获产物密度高、成分均匀的含锶CaTiO3;制备的CaTiO3可将核素固化于其基体结构中 ,对SrO的包容量可达到 35 % (质量分数 ) ,从而达到封闭、隔离核素 。Using chromium oxide (CrO3) as an oxidant, the perovskite (CaTiO3) structure compound with Sr2+ was the prepared by the SHS-densification method. The density, microhardness and synthesis mechanism of the reaction products are investigated by X-ray diffraction, hardometer, densitometer and scanning electron microscopy. The primary results show that the SHS reaction temperature will increase when CrO3 is used as an oxidant, leading to the formation of Sr2+-CaTiO3 compound with higher density and the content of SrO can reach 35% in mass, so that the SHS method can be used to immobilize the radioactive waste (RAW) effectively.

关 键 词：自蔓延高温合成 钙钛矿 放射性废物 固化 

分 类 号：X771[环境科学与工程—环境工程]