硅酸盐学报

Mo–Si–B对ZrB2超高温陶瓷烧结工艺和性能的影响

作者：赵笑统1 赵新阳1 李智强1 卢绪高1 邵刚1 马世晨1 王海龙1 张锐2

单位：1. 郑州大学材料科学与工程学院郑州 450001 2. 郑州航空工业管理学院郑州 450015

关键词：二硼化锆钼硅硼合金抗氧化热压烧结

分类号：TB3

出版年,卷(期):页码：2018,46(3):382-387

DOI：

摘要：

针对ZrB2陶瓷材料的断裂韧性低及抗氧化性能差等问题，选择Mo粉、Si粉和B粉为第二相添加物，借助Mo–Si–B间的原位反应生成Mo5SiB2等三元或二元化合物与ZrB2复合，提高ZrB2陶瓷的断裂韧性与抗氧化性能。将混合粉体在1 900 ℃、20 MPa的条件下经热压烧结制备出致密的ZrB2陶瓷复合材料，所烧结样品的抗弯强度和断裂韧性随着Mo–Si–B含量的增加呈现先增加再降低再增加的趋势，当Mo–Si–B含量为20%(体积分数)时所得样品的断裂韧性最大，其值为(5.55±0.11) MPa·m1/2，当Mo–Si–B含量为30%时所得样品的抗弯强度最大，其值为(500±40) MPa。所烧结的样品都具有良好的抗氧化性能，其主要机理是在复合材料表面形成一定数量的玻璃相，阻止氧气向材料内部扩散。

Mo, Si and B powders were used as second phase aids to improve the fracture toughness and the oxidation resistance of ZrB2 ceramic. The dense ZrB2–Mo–Si–B ceramic composites were fabricated via hot pressing at 20 MPa and 1 900 ℃ for 1 h due to the in-situ reaction between Mo–Si–B. The flexural strength and fracture toughness of the sintered samples firstly increase, then decrease and further increase with the amount of Mo–Si–B increasing. ZrB2–20% (volume fraction) Mo–Si–B composite has the maximum fracture toughness of (5.55±0.11) MPa·m1/2. ZrB2–30%Mo–Si–B composite has the maximum bending strength of (500±40) MPa. All the sintered samples show a good oxidation resistance due to the glassy phase formed on the surface of composites, preventing the inner-transformation of oxidation.

基金项目：

河南省高校科技创新人才(15HASTIT009);中国博士后科学基金(2016T90677，2014M561997)；国家自然科学基金(51772275)资助。

作者简介：

赵笑统(1989—)，男，博士研究生。

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