SiC基复相陶瓷凝胶注模成型工艺研究进展

Research Progress on Gelcasting of SiC-Based Multiphase Ceramics

国内外学者通过向SiC材料中添加不同种类的氧化物、氮化物或氧氮化物等制备出了强度高、抗热震性好、热导率高、耐化学腐蚀性优良的SiC基复相陶瓷,同时也有效地解决了纯SiC陶瓷难以烧结致密的问题。凝胶注模成型是新型陶瓷制备技术,能近净尺寸制备大尺寸、复杂形状的陶瓷坯体,是近些年来制备SiC基复相陶瓷最常用的成型方法之一。本文从SiC基复相陶瓷的浆料制备、浆料固化及素坯干燥等方面综述了SiC基复相陶瓷凝胶注模成型工艺,分析了其目前存在的一些问题及未来的发展方向。

Domestic and foreign scholars successfully prepared SiC multiphase ceramics, which had high strength, good thermal shock resistance, high thermal conductivity and excellent chemical corrosion, by adding different kinds of oxides, nitrides or oxynitrides to the SiC material. SiC multiphase ceramics effectively solved the hard sintering of pure SiC ceramics. Gelcasting which can near-net-shape produce large-size complex ceramic pieces is a novel technology for the preparation of ceramics. It is one of the most commonly used methods for the preparation of SiC multiphase ceramics in recent years. This paper reviewed the gelcasting process for SiC-based multiphase ceramics from several aspects such as the slurry preparation, the slurry solidification and the biscuit drying, analyzed the existing problems and predicted its future developments.