摘要
以ZrB2 作为掺加剂 ,通过热压烧结制备了TiB2 -ZrB2 固溶复合陶瓷。采用X射线衍射分析对材料的相组成、晶格常数和晶体结构进行了分析 ,材料的显微结构分别由EPMA ,SEM和TEM测定。研究结果表明 ,随着ZrB2 掺入量的增大 ,固溶产物的晶格常数会相应增加 ,当ZrB2 的掺加量为 8% (摩尔分数 )时 ,产物的晶格常数出现极大值 ;ZrB2 可以与TiB2 形成部分固溶的固溶体 ,在复合材料中存在富Ti和富Zr的两种硼化物 ;由于固溶反应在界面上进行 ,有效地降低了烧结过程中的晶界移动速度 。
TiB 2-ZrB 2 solid solution composites were prepared by hot pressing. The effects of additive content on phase constituent and crystal structure of the composite were investigated by X_ray diffraction analysis. The microstructure analysis was carried out by EPMA, SEM and TEM. Under the experimental conditions, it is shown that crystal parameters increase with the increase of ZrB 2 content and reach the maximum value when ZrB 2 content is 8%(in mole). Two types of boride, Ti_rich and Zr_rich compounds, are found in the composite due to ZrB 2 partly dissolving in the TiB 2 matrix at the interface. the velocity of the grain boundary immigration decreases effectively by the solid solution reaction during sintering, which redounds to gain uniform grains in composite.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2002年第4期486-490,共5页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金资助项目 (5 980 2 0 0 8)
湖北省自然科学基金资助项目 (2 0 0 0J0 3 1)~~
