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.
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)
出处
《山东化工》
CAS
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)。
关键词
碳化硅
Β-锂辉石
热膨胀
显微结构
silicon carbide
β-spodumene
thermal expansion
microstructure
