两步烧结法制备纳米氧化钇稳定的四方氧化锆陶瓷  

Two-Step Sintering of Nano-Yttria Stabilized Tetragonal Zirconia Ceramics

作　　者：陈静[1] 黄晓巍[1] 覃国恒[1] 

机构地区：[1]福州大学材料科学与工程学院,福州350108

出　　处：《硅酸盐学报》2012年第3期335-339,共5页Journal of The Chinese Ceramic Society

基　　金：福建省自然科学基金(2008J0146)资助項目

摘　　要：采用共沉淀法制备纳米氧化钇稳定的四方氧化锆(yttria stabilized tetragonal zirconia,3Y-TZP)粉体。利用X射线衍射、N2吸附–脱附等温线,透射电子显微镜对3Y-TZP粉体的物理性能和化学性能进行表征。研究了纳米3Y-TZP粉体的烧结曲线,分析了3Y-TZP素坯在烧结过程中的致密化行为和显微结构,探讨了两步烧结工艺对3Y-TZP纳米陶瓷微观结构的影响。结果表明:采用共沉淀法,在600℃煅烧2h后,可获得晶粒尺寸为13nm、晶型发育良好、团聚较少的纳米3Y-TZP粉体;采用两步烧结法,将素坯升温至1200℃保温1min后,再降温到1050℃保温35h,可获得相对密度大于98%,晶粒尺寸约为100 nm的3Y-TZP陶瓷。两步烧结法通过控制煅烧温度和保温时间,利用晶界扩散及其迁移动力学之间的差异,使晶粒生长受到抑制,样品烧结致密化得以维持,实现在晶粒无显著生长前提下完成致密化。A nano-sized powder of 3%（mole fraction） yttria stabilized tetragonal zirconia（3Y-TZP） was prepared by a co-precipitation method.The physical and chemical properties of 3Y-TZP powders were characterized by X-ray diffraction,N2 adsorption–desorption iso-therms and transmission electron microscope,respectively.The sintering curve of the nano-sized powder of 3Y-TZP,the densification behav-ior and microstructure of the sintered bulk were analyzed,and the influence of two-step sintering on the microstructure of the 3Y-TZP ceram-ics was discussed.The results show that the well-developed crystal and agglomeration-free nano-sized powder with the grain size of 13 nm was obtained by co-precipitation method and the subsequent calcination at 600 ℃ for 2 h.The relative density of the 3Y-TZP ceramics was 98% and the grain size was 100 nm when the green body was calcined at 1 200 ℃ for 1 min and then decreased to 1 050 ℃ for 35 h using two-step sintering method.It was found that the grain growth was inhibited and the densification of the samples was achieved through controlling the calcining temperature and holding time in the two-step sintering process utilizing the different migration kinetics between the grain boundary diffusion and the grain boundary migration.Finally,the sintered body had a full density without any grain growth.

关 键 词：氧化钇稳定的四方氧化锆 共沉淀法 两步烧结 晶粒尺寸 

分 类 号：TB383[一般工业技术—材料科学与工程]