Skutterudite类化合物晶粒长大规律和放电等离子体烧结的研究  

STUDY OF GRAIN GROWTH AND SPARK PLASMA SINTERING OF A SKUTTERUDITE COMPOUND

作　　者：杨磊[1] 吴建生[1] 张澜庭[1] 

机构地区：[1]上海交通大学材料科学与工程学院教育部高温材料及测试开放实验室,上海200030

出　　处：《金属学报》2003年第8期785-789,共5页Acta Metallurgica Sinica

基　　金：国家自然科学基金资助项目 59902003

摘　　要：用熔融-退火-放电等离子体烧结法(SPS)制备了晶粒尺寸均匀致密度高的La0.75Fe3CoSb12热电合金.研究了退火时间和温度对skutterudite合金晶粒长大的影响,晶粒生长动力学指数n=2.7,表观生长激活能Q=381±30 kJ/mol.晶粒长大主要受扩散机制控制. SPS的致密度随烧结时间的延长和温度的升高而增加, SPS后微观组织的观察表明,通过控制退火温度可有效地控制合金最终的晶粒尺寸.A dense La0.75Fe3CoSb12 thermoelectric material with uniform grain size was prepared by melt-annealing-SPS processing. The effects of annealing time and temperature on the grain-growth of the alloy were observed and the grain growth exponent n and the apparent activation energy Q were estimated to be 2.7 and 381 +/-30 kJ/mol respectively. It is found that the grain growth is controlled by a diffusion mechanism. Density of the specimen increases with increasing SPS time and temperature. Microstructure of the specimen after SPS shows that the final grain size of sintered ingot can be efficiently controlled by the annealing temperature.

关 键 词：热电材料 填充Skutterudite化合物 晶粒生长 放电等离子体烧结 

分 类 号：TG113[金属学及工艺—物理冶金]