振荡压力烧结法制备高致密度细晶粒氧化锆陶瓷  

Preparation of Zirconia Ceramics with High Density and Fine Grains by Oscillatory Pressure Sintering

作　　者：李双[1,2] 谢志鹏[1] 

机构地区：[1]清华大学材料学院,新型陶瓷与精细工艺国家重点实验室,北京100084 [2]山东理工大学资源与环境工程学院,淄博255049

出　　处：《无机材料学报》2016年第2期207-212,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金项目(51427802)~~

摘　　要：针对重大工程和关键技术对高强韧性、高可靠性陶瓷部件的迫切需求,本研究提出了适用于高性能陶瓷制备的振荡压力烧结(Oscillatory Pressure Sintering,OPS)新方法,并采用此种方法制备了高致密度、细晶粒、高强度和高可靠性的氧化锆陶瓷。作为对比,在相同的温度条件下分别采用无压烧结(Pressureless Sintering,PS)和热压烧结(Hot Pressing,HP)制备了氧化锆陶瓷。SEM研究表明振荡压力抑制了高温下氧化锆晶粒的快速生长,统计表明OPS氧化锆的平均晶粒尺寸为251 nm,而PS氧化锆、HP氧化锆的平均晶粒尺寸分别为451 nm和298 nm。另外,振荡压力引发的晶粒塑性形变和晶界滑移促进了晶界处闭气孔的排出,使OPS氧化锆的体积密度提高到99.7%。氧化锆致密度的提高及晶粒细化使其断裂强度从1003 MPa提高到1572 MPa,Weibull模数从13提高到32。另外,低温老化实验表明OPS氧化锆的抗老化性能也得到显著提高。To fulfill the demands of ceramic components with high strength, high toughness and high reliability in key projects, a novel oscillatory pressure sintering （OPS） method was proposed in this study. With this new method, zirconia ceramics with high relative density, fine grains, high fracture strength, and excellent reliabil- ity, were prepared. As a comparison, zirconia ceramics were sintered by pressure-less sintering （PS） method and hot pressing （HP） method at same temperature. SEM analysis shows that the oscillatory pressure inhibits the rapid grain growth of zirconia at high temperature. Statistic results indicate that the OPS zirconia presents fine grain size at 251 nm, while the average sizes of PS and HP zirconia are 451 and 298 nm, respectively. In addition, the oscillatory pressure induces plastic deformation of grains and sliding of grain boundaries, facili- tating elimination of closed pores at grain boundaries. As a result, the relative density of OPS zirconia reaches approximately 99.7%. Due to the refinement of grains and the increase in relative density, the OPS zirconia presents an increase from 1003 MPa to 1572 MPa in flexural Weibull modulus. Furthermore, its resistance to low temperature strength, and an increase from 13 to 32 in degradation is also improved because of themicrostructure evolution.

关 键 词：振荡压力 晶粒细化 强度韧性 致密度 

分 类 号：TB332[一般工业技术—材料科学与工程]