硅酸盐学报

凝胶注模制备碳化硼多孔陶瓷

单位：1. 哈尔滨工业大学复合材料与结构研究所哈尔滨 150080 2. 哈尔滨工业大学材料科学与工程学院特种陶瓷研究所哈尔滨 150080

分类号：

出版年,卷(期):页码：2017,45(9):0-0

DOI：

摘要：

以琼脂糖大分子为凝胶体系、聚丙烯酸为分散剂，采用凝胶注模工艺制备B4C坯体，经过1 800~2 000 ℃烧结，制备得到B4C多孔陶瓷。结果表明：pH值为7.5、分散剂含量为0.15% (体积分数)时，陶瓷浆料的稳定性和流动性最佳，制备得到固相含量为45% (体积分数)的低黏度陶瓷浆料。随着烧结温度升高，多孔陶瓷的通孔率下降，1 800 ℃烧结得到的块体通孔率为100%，气孔呈明显的单峰分布，孔径大小为1 μm。多孔陶瓷的抗弯强度在60 MPa左右。Zr金属浸渗B4C多孔陶瓷后得到ZrC/ZrB2复合材料，其微观组织随渗层深度变化出现分层现象。

基金项目：

国家自然科学基金(51472060，51532006)资助。

作者简介：

董善亮(1986—)，男，博士研究生。

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