摘要
通过测定试样真密度、烧成收缩率、相对密度以及XRD分析 ,系统地研究了原位反应结法制备莫来石一氧化锆复相陶瓷的反应烧结机理 .研究结果表明 ,ZrSiO4 在 135 0℃开始分解 ,生成t -ZrO2 和非晶相SiO2 .随着温度升高 ,非晶相含量增加 ,并在 142 0℃形成莫来石 .ZrO2 的分解和莫来石晶相的生成有一定时间间隔 ,该化学反应在 142 0~ 1480℃之间迅速进行 ,并对致密化产生不利影响 ,可采用分段烧结或阶段性保温技术来提高试样的烧结性能 .
Presents the reacted sintering mechanisms of ZTM composites prepared by insitu reacted sintering through determination of real density, reactive desity and shrinkage of specimens as well as TRD analysis and points out that ZrSiO 4 and non crystalline matter whose content increases with temperature going up, however, mullite is formed at 1 420 ℃. ZrSiO 4 decomposition and mullite formation have certain interval. The chemical reaction proceeds rapidly at 1 420~1 480 ℃ and is unfavorable to densification and the sintering properties of specimens can be improved by staged reaction sintering and staged holding temperature.
出处
《材料科学与工艺》
EI
CAS
CSCD
2000年第3期21-25,共5页
Materials Science and Technology
基金
清华大学新型陶瓷与精细工艺国家重点实验室开放基金!资助项目 (X .GZ970 6 )