SiC复相陶瓷内加热器套管的制备及性能  

Preparation and Property of Immersion Heater with SiC Composite Ceramic Sheath

作　　者：杨万利[1] 史忠旗[1] 金志浩[1] 乔冠军[1] 

机构地区：[1]西安交通大学材料科学与工程学院,金属材料强度国家重点实验室,西安710049

出　　处：《硅酸盐学报》2012年第3期362-365,共4页Journal of The Chinese Ceramic Society

基　　金：国家“863”计划(SQ2011AAJY2755);国家自然科学基金(51002115)资助项目

摘　　要：用SiC粉作内加热器套管基本原料,采用反应烧结及常压烧结工艺制备具有复层结构的SiC复相陶瓷套管。套管内层为高致密SiC/Si复合材料,外层为SiC/C/SiC复相陶瓷。通过实验模拟内加热器服役环境,将套管内置热源在750℃熔融铝液中加热360 h测试其使用性能,研究外部复杂熔液腐蚀环境及内部强氧化气氛对SiC复相陶瓷套管的密度、抗弯强度、物相组成及显微形貌的影响。结果表明:复层结构SiC套管在模拟实验中展现出良好的抗热震及抗熔液浸蚀能力;内层材料由于高致密性具有良好的抗氧化性能;外层材料浸入熔体部分强度损伤小于10%,液面以上部分残余强度达到48MPa。SiC复相陶瓷套管在有色金属熔炼行业展现出良好的应用前景。The SiC composite ceramic sheath with multi-layer structure was fabricated via reaction sintering and pressureless sinter-ing processes using SiC powder as a raw material.The inner sheath was a dense SiC/Si composite material,and the outer sheath was a SiC/C/SiC composite ceramic.The immersed experiment was carried out from SiC composite sheath into molten aluminum at 750 ℃ for 360 h.The density and bending strength of the composites before and after immersed experiment were examined,and the micro-structure and phase composition of the composites were investigated.The results show that the SiC sheath has a good thermal shock resistance and a molten erosion resistance in the immersed experiment.The inner materials had a good oxidation resistance due to its high density.The bending strength of the outer part of the composite immersed in the melt was decreased by 10%,and the residual bending strength of upper melt part reached 48 MPa.Therefore,the SiC composite ceramic sheath exhibited a promising application prospect in the molten non-ferrous metals.

关 键 词：碳化硅 内加热器套管 有色金属熔液 复层结构 

分 类 号：TQ174[化学工程—陶瓷工业]