蓝晶石基微孔针状莫来石的制备、结构及性能研究  

Preparation, Microstructure and Property of Microporous Needle-like Mullite Ceramics Based on Kyanite

作　　者：郭会师[1] 叶方保[1] 李文凤[2] 张卫华[1] 宋聪聪[1] 

机构地区：[1]郑州大学高温材料研究所河南省高温功能材料重点实验室,郑州450052 [2]河南工业大学材料科学与工程学院,郑州450001

出　　处：《中国陶瓷》2016年第1期59-63,共5页China Ceramics

基　　金：国家自然科学基金重点项目(51032007)

摘　　要：以蓝晶石和γ-Al_2O_3为主要原料,采用注浆成型技术和反应烧结工艺制备出气孔率高、强度高、孔径小、并具有针状网络结构的微孔莫来石陶瓷材料。研究了γ-Al_2O_3加入量对烧后试样物相组成、显微结构及性能的影响。结果表明:针状莫来石可对基体起强韧化作用,并使气孔的有效半径微细化。随着γ-Al_2O_3加入量的增多,试样中原位生成的针状莫来石先增多且后减少,致使试样的显气孔率和常温机械强度先升高后降低、平均孔径先减小后增大。Microporous mullite ceramics with high open porosity, excellent mechanical strength, small pore size and well-developed needle-like network structures were prepared through grouting technology and reaction sintering using kyanite and γ-Al2O3as the main raw materials. The influence of γ-Al2O3content on the phase composition, microstructure and properties of samples was investigated. Results show that the needle-like mullites not only can strengthen and toughen samples, but also make the effective radius of pore smaller. With the increasing of γ-Al2O3content, the amounts of generated needle-like mullites increased firstly then decreased, which leads to the result that the apparent porosity and mechanical strength of room temperature increased firstly and then decreased, while the average pore size showed a reverse tendency.

关 键 词：蓝晶石 多孔莫来石 微气孔 针状莫来石 显微结构 孔径分布 

分 类 号：TQ174.758[化学工程—陶瓷工业]