近零膨胀ZrO2-ZrW2O8复合材料的制备和表征  

The preparation and characterization of ZrO2-ZrW2O8 composites with nearly zero thermal expansion

作　　者：张志萍[1] 刘红飞[1] 程晓农[1] 

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013

出　　处：《功能材料》2007年第A08期3194-3197,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项（50372027：50442023）;江苏省研究生创新基金资助项目（BG2004026）

摘　　要：以分析纯ZrO2和WO3为原料，通过原位反应法成功制备了ZrO2-ZrW2O8复合材料，研究了其热膨胀性能，并探讨了烧结助剂AJ203对其致密度的影响。采用X射线衍射仪（XRD）、扫描电镜（SEM）和热膨胀仪对制备的样品进行表征。研究结果表明：制备的复合材料的组元为α-ZrW2O8和m-ZrO2；其中ZrO2-33％（质量分数），ZrW2O8复合材料的热膨胀系数近似为零，但致密度不高；添加0．30％（质量分数）Al2O3有效地提高了ZrO2-33％（质量分数）ZrW2O8复合材料的致密度，与出现的新相Al2（WO4）3有关，而且对其零膨胀特性影响不大。ZrO2-ZrW2O8 composites successfully prepared by in-situ method were started by analytically pure ZrO2 and WO3. This work also studied thermal expansion behavior of the composites and the influence of Al2O3 as a sintering aid on the density of the composites. The synthesized composites were characterized by powder X-ray diffraction （XRD）, scanning electron microscopy （SEM） and dilatometry. The results show that the composites contain only α-ZrW2O8 phase and m-ZrO2 phase without other phases. ZrO2-33wt%ZrW2O8 composites have nearly zero thermal expansion coefficient among all the samples, but the density of that is low. Adding 0.30wt% A1203 is effective to increase the density of ZrO2-33wt%ZrW2O8 composites, which is caused by the new phase Al2（WO4）3. At the same time, it is slight to influence the zero thermal expansion behavior of the composites.

关 键 词：钨酸锆 二氧化锆 近零膨胀 烧结助剂 原位反应法 

分 类 号：TQ174.758.2[化学工程—陶瓷工业]