一次共烧非对称梯度碳化硅陶瓷膜微结构形成机理及调控研究

项目名称： 一次共烧非对称梯度碳化硅陶瓷膜微结构形成机理及调控研究

项目编号： No.51302076

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 一般工业技术

项目作者： 郭文明

作者单位： 湖南大学

项目金额： 25万元

中文摘要： 碳化硅陶瓷膜因具有比其它膜更优异的耐高温、耐腐蚀、机械强度高、处理通量大等优势而快速发展并广泛应用，已成为极端环境高效分离的最理想的膜材料。然而其支撑体、中间层和分离层需分层多次烧结，致使其制备工艺复杂、成本高。本项目以再结晶碳化硅 (RSiC) 材料为基础，开展非对称梯度结构碳化硅陶瓷膜一次共烧技术及微结构形成机理的研究，通过界面调控使烧结机制不同的各层实现协同共烧，揭示其共烧结机理；研究碳化硅陶瓷膜一次共烧的传质机制和微结构形成机制，开发有机/无机协同造孔-原位自纯化技术，结合颗粒级配设计、界面修饰进行微结构调控；构建碳化硅陶瓷膜微结构与其性能之间的变化关系，开展碳化硅陶瓷膜在极端环境下废水废气分离处理的初步应用研究。该研究成果将为碳化硅陶瓷膜的设计、制备提供理论指导和科学依据，并为梯度功能陶瓷的一次共烧提供新的思路。

中文关键词： 碳化硅；陶瓷膜；一次共烧；微结构；界面调控

英文摘要： Compared to other membranes, silicon carbide ceramic membrane has been rapidly developed and widely applied because of its excellent properties such as high-temperature resistance, corrosion resistance, high mechanical strength and high flux, etc. SiC membrane has become the most reliable material for the efficient separation in the extremely severe environment. However, the three layers of SiC membrane, i.e., the support, the intermediate layer and the separation layer, need to be sintered for several times, which result in its complex preparing process and high costs. In this project, the mass transfer mechanism between particles in layers and that between layers during the preparation of asymmetric gradient SiC ceramic membrane by co-sintering based on recrystallizaed SiC (RSiC) would be investigated in detail. The regulation and control of particle interface in layer and interface between layers would be proposed to uniform the sintering temperature, match the sintering shrinkage and inhibit the mass transfer among layers, ulteriorly to achieve the co-sintering of SiC membrane and to reveal its sintering mechanism. The evolution mechanism of SiC membrane during co-sintering woul also be investigated. The technology combined with organic/inorganic coordinating pore-forming and self-purification, together wit

英文关键词： Silicon carbide；Ceramic membrane；Co-sintering；Microstructure；Interface control