微量纳米氧化铝掺杂强化氧化锆陶瓷材料研究

Micro-sized Alumina-doped Zirconia Ceramic Material

本文采用纳米氧化铝制备了氧化兌稳定氧化锆(YSZ)陶瓷,并结合扫描电子显微镜SEM,EDS能谱,烧结密度,抗弯强度及断裂韧性等测试技术对试样进行表征及分析。研究结果表明:采用该湿法粉碎工艺成功实现了微量纳米氧化铝对YSZ材料的掺杂改性,掺杂后的样品,氧化锆陶瓷晶粒细小,断裂主要以穿晶断裂为主,这可能是由于纳米氧化铝颗粒对氧化锆材料颗粒晶界产生了钉扎作用,有效抑制了氧化锆基体晶粒的异常长大,同时有利于减小基体中各种缺陷尺寸,使得基体材料具有更加均匀的微观结构。当氧化铝掺杂量为0.25wt.%时,烧结致密度、抗弯强度和断裂韧性分别达到99.6%、1206MPa和9.4MPa·m^1/2,材料的力学性能最佳。

In this paper,yttrium oxide stabilized zirconia (YSZ) ceramics were prepared by nano-alumina.The samples were cha racterized by SEM and EDS,and the sintering density,bending strength and fracture toughness were analyzed.The results show that the doping modification of YSZ material with trace nano-alumina has been successfully realized by this wet grinding process.The grain size of zirconia ceramics is fine and the fracture is mainly transgranular.This may be due to the pinning effect of na no-alumina particles on the grain boundary of zirconia particles,which can effectively inhibit the abnormal grain growth of zir conia matrix and reduce all kinds of defect sizes in the matrix.It makes the matrix material have more uniform microstructure.When the alumina content is 0.25wt.%,the sintering density,bending strength and fracture toughness are 99.6%,1206 MPa and 9.4 MPa·m^1/2,respectively.The mechanical properties of the material are the best.