溶胶-凝胶法陶瓷表面氧化锆薄膜的制备、性能及影响机制  

Preparation,Performance and Influencing Mechanism of Zirconia Coating on Three-Dimensional Silicon Carbide via Sol-Gel Process

作　　者：闫海乐[1] 茹红强[1] 喻亮[1] 武艳君[1] 里景阳[1] 魏文韬[1] 岳新艳[1] 

机构地区：[1]东北大学材料各向异性与织构教育部重点实验室,辽宁沈阳110004

出　　处：《材料保护》2010年第2期9-12,共4页Materials Protection

基　　金：国家自然科学基金资助项目(50872018);全国大学生创新性实验计划

摘　　要：金属陶瓷复合材料性能优异,用途广泛,但两者间的剧烈反应,会影响其最终性能。以化学纯氧氯化锆和尿素为原料,水为溶剂,硝酸钇为氧化锆晶型稳定剂,利用溶胶-凝胶法在三维网络-碳化硅(3D-meshySiC)基体表面涂覆以Zr(OH)4形式存在的溶胶,采用分级干燥工艺,经700℃煅烧,制备了氧化锆薄膜,作为两者界面反应的阻挡层。利用红外吸收光谱法(IR)、热重分析(TG)和差热分析(DSC)法研究了凝胶在加热时的物理-化学变化,采用X射线衍射仪(XRD)和扫描电子显微镜(SEM)分析了薄膜的物相和显微结构。结果表明:在经过自氧化处理的基体表面制备出了致密、平整、均匀,厚为0.5～0.8μm的四方相氧化锆薄膜,此膜与基体结合牢固。ZrO2 coating was preparedon the surface of three-dimensional SiC by using sol-gel methodin association with sintering in vacuum at 700℃,whereZrOCl2.8H2O and CO(NH)2 were used as the raw materials,water as a solvent,and Y(NO3)3 as a crystal stabilizer.Infra-red spectrometry,thermogravimetry and differential scan-ning calorimetry were used to study the physical and chemicalchanges of the gel in heating process.At the same time,the com-position,microstructure and phase constitution of the coating wereanalyzed by means of X-ray diffraction and scanning electron mi-croscopy.Results show that the ZrO2 coating prepared on the sur-face of three-dimensional SiC matrix and treated by oxygenation iscompact,smooth and uniform,and has a thickness of 0.5～0.8mm and good adhesion to the substrate.

关 键 词：溶胶-凝胶法 三维网络-碳化硅 陶瓷 氧化锆 薄膜 真空浸渍法 

分 类 号：TB383.2[一般工业技术—材料科学与工程]