直接发泡法制备ZrO_2纤维增强的ZrO_2闭孔泡沫陶瓷  

Preparation of Zirconia Fiber Reinforced Closed Porosity Foam Zirconia Ceramic by Direct Foaming Method

作　　者：代德美 刘和义[1,2] 吴哲 刘聪 

机构地区：[1]南京理工大学材料科学与工程学院,江苏南京210094 [2]江苏和腾热工装备科技有限公司,江苏张家港215600

出　　处：《真空电子技术》2017年第5期27-32,76,共7页Vacuum Electronics

摘　　要：以立方相ZrO_2粉末为基体、ZrO_2纤维为增强体、聚乙烯醇为粘结剂,利用氧氯化锆与过氧化氢反应发泡聚凝,高温烧结获得ZrO_2纤维增强的ZrO_2闭孔泡沫陶瓷。采用扫描电镜、X射线衍射、导热系数测试、加热线收缩测试、力学性能测试对样品进行了综合研究,探讨了发泡剂加入量、纤维加入量及粘结剂加入量对发泡效果及陶瓷性能的影响。结果表明:当ZrO_2粉末:ZrO_2纤维:氧氯化锆:过氧化氢:聚乙烯醇质量比为1∶0.31~0.55∶0.04∶0.15~0.20∶0.01~0.02时,所得泡沫陶瓷性能较好,气孔率约80%,密度约1.25g/cm^3,导热系数约0.09 W/(m·K),1700℃/12h加热永久线收缩约1%,抗弯强度达114 MPa。Zirconia fiber reinforced closed porosity foam zirconia ceramic was prepared by using cubic zirconia powder as matrix,cubic zirconia fiber as reinforcement and polyvinyl alcohol solution as viscous agent.The process of foaming and freezing was realized by the reaction of zirconium oxychloride with hydrogen peroxide.The samples were characterized by SEM,XRD,thermal conductivity tester,high-temperature resistance tester and mechanical property tester.The effects of the addition amount of foaming agent,zirconia fiber and viscous agent on the properties of ceramic were discussed.The result shows that when the mass ratio of zirconia powder:zirconia fiber∶zirconium oxychloride∶hydrogen peroxide∶polyvinyl alcohol=1∶0.31~0.55∶0.04~0.06∶0.15~0.20∶0.01~0.02,the properties of ceramic are relatively good.The porosity is about 80%,the density is about 1.25g/cm^3,the thermal conductivity coefficient is about 0.09W/(m·K),the permanent liner shrinkage at 1700℃/12 his about 1%,and the bending strength is about 114 MPa.

关 键 词：ZrO2闭孔泡沫陶瓷 ZrO2纤维增强 直接发泡法 

分 类 号：TQ174.5[化学工程—陶瓷工业]