锂辉石对碳化硅基复相陶瓷热膨胀及显微结构的影响  

Effect of Spodumene on Thermal Expansion and Microstructures of Silicon Carbide-matrix Composite Ceramics

作　　者：鲁媛媛 王丽莎 杨力妮 周恒为 Lu Yuanyuan;Wang Lisha;Yang Lini;Zhou Hengwei(School of Chemical and Textile Engineering,Xinjiang University of Science and Technology,Korla 841000,China;Xinjiang Laboratory of Phase Transitions and Microstructures in Condensed Matters,College of Physical Science and Technology,Yili Normal University,Yining 835000,China)

机构地区：[1]新疆科技学院化工与纺织工程学院,新疆库尔勒841000 [2]伊犁师范大学物理科学与技术学院,新疆凝聚态相变与微结构实验室,新疆伊宁835000

出　　处：《山东化工》2023年第4期1-4,共4页Shandong Chemical Industry

基　　金：新疆科技学院自然科学基金资助项目(2020PT019)。

摘　　要：采用近零膨胀材料β-锂辉石作为高温结合剂,通过常压烧结制备碳化硅基复相陶瓷材料,研究β-锂辉石质量分数为25%~40%、烧结温度为1500~1600℃复相陶瓷的致密性、显微结构和热膨胀系数。结果表明:β-锂辉石高温熔融产生液相能包裹碳化硅颗粒,烧结过程中锂辉石的相变在一定程度提高了材料致密性。复相陶瓷中玻璃相含量是引起热膨胀系数升高的主要原因。当β-锂辉石添加比为35%时,在1600℃烧结下的复相陶瓷的热膨胀系数低于1550℃,且杨氏模量有小幅增加。Usingβ-spodumene as high-temperature binder,silicon carbide-based composite ceramic materials were prepared by pressureless sintering.The densification,microstructure and coefficient of thermal expansion(CET)of composite ceramics withβ-spodumene content of 25%~40%and sintering temperature of 1500~1600℃were studied.Results indicated that SiC particles were wrapped by liquid phase ofβ-spodumene produced in the high temperature.The phase transition of spodumene during the sintering process could promote the densification of composite ceramics to a certain extent,and the content of glass phase in the composite ceramics was the main reason for the increase of thermal expansion coefficient.When the addition ratio ofβ-spodumene was 35%,the thermal expansion coefficient of the composite ceramics sintered at 1600℃was lower than 1550℃,and there was slightly increase in Young’s modulus.

关 键 词：碳化硅 Β-锂辉石 热膨胀 显微结构 

分 类 号：TQ174.75[化学工程—陶瓷工业]