Boron carbide-based composite ceramic material and preparation method thereof: Fid-Bau Portal

Boron carbide-based composite ceramic material and preparation method thereof

WANG WEIMIN / CHEN XIZHAO / HE QIANGLONG

The invention relates to a boron carbide-based composite ceramic material and a preparation method thereof. The composite ceramic material is prepared by uniformly mixing boron carbide powder, titanium carbide powder and boron powder and sintering at high temperature and pressure, the main phase composition in the composite ceramic material is boron carbide and titanium boride, and the grain sizeis 0.8-1.5 [mu] m; the molar ratio of the titanium carbide powder to the boron powder in the raw material powder is 1: 6, and the boron carbide powder accounts for 10-80% of the mass of the raw material powder. The boron carbide-titanium boride composite ceramic material of which the boron carbide content is up to 50-90wt% is prepared by combining in-situ reaction synthesis with a hot pressed sintering densification technology,and the problems of low boron carbide content, high material specific gravity, reduced hardness and the like in the existing in-situ composite boron carbide ceramic aresolved. The boron carbide-titanium boride composite material also has the characteristics of fine grains, excellent tissue structure and high density, has excellent comprehensive properties, and hasimportant application value in the fields of wear-resistant ceramic parts, impact-resistant protective materials and the like.

本发明涉及一种碳化硼基复合陶瓷材料及其制备方法，该复合陶瓷材料由碳化硼粉体、碳化钛粉体和硼粉混合均匀后经高温压力烧结制备而成，复合陶瓷材料中主要物相组成为碳化硼和硼化钛，晶粒尺寸为0.8～1.5μm；原料粉体中碳化钛粉体与硼粉摩尔比为1：6，碳化硼粉占原料粉体质量的10～80％。本发明采用原位反应合成结合热压烧结致密化技术制备得到碳化硼含量高达50～90wt％的碳化硼‑硼化钛复合陶瓷材料，解决了现有原位复合碳化硼陶瓷中碳化硼含量低、材料比重大、硬度下降等问题，该碳化硼基复合材料还具有晶粒细小、组织结构优良、致密度高的特点，综合性能优良，在耐磨陶瓷部件、抗冲击防护材料等领域有重要的应用价值。

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