工艺参数对热等静压制备的3Y-TZP陶瓷性能的影响  

Effects of process parameters on HIP sintered 3Y-TZP ceramics behavior

作　　者：李树先[1] 朱德贵[1] 

机构地区：[1]西南交通大学教育部材料先进技术重点实验室,成都610031

出　　处：《粉末冶金材料科学与工程》2008年第1期40-44,共5页Materials Science and Engineering of Powder Metallurgy

摘　　要：对常压预烧结(1350℃×4h)后的3Y-TZP陶瓷试样进行热等静压烧结,系统研究烧结温度和压力对陶瓷的烧结性能、力学性能以及相组成的影响。结果表明,在高温、高压下对3Y-TZP陶瓷进行热等静压烧结,温度比压力的影响更显著。从而得到一个最佳的热等静压烧结制度:1300℃×1h,压力150MPa,此时试样达到最佳力学性能,HV和KIC分别为14.2MPa和17.7MPa·m1/2。用XRD和SEM分析3Y-TZP陶瓷的组织结构发现,烧结后3Y-TZP陶瓷中ZrO2几乎全部以四方相形式存在,且ZrO2平均晶粒尺寸在1～3μm之间,主要的断裂模式是沿晶断裂,并伴随有少量的穿晶断裂。An effort has been made to study the different pressure and temperature effect on the densification behavior, mechanical properties and phase compositions of 3Y-TZP ceramics, which is HIP sintered after pressureless pre-sintered at low-temperature （1 350 ℃×4 h）. The results indicated that the effect of temperature is remarkable than that of pressure on the 3Y-TZP ceramics sintered under high temperature and pressure. The final sample has optimum mechanical properties, among others fracture toughness and Vickers hardness are 14.2 MPa.m^1/2 and 17.7 GPa, respectively, which are obtained after sintering at 1 300 ℃ for lh under 150 MPa and be recognized as the optimum HIP sintering procedure. X-Ray Diffraction and Scanning Electronic Microscopy have been employed to study the morphologies and structures of the 3Y-TZP ceramics. The results demonstrated that ZrO2 in sintered 3Y-TZP ceramics is mainly in tetragonal structure with the size in the range of 1-3 μm, and the intergranular fracture is predominant fracture mode plus minor amounts of trasgranular fracture.

关 键 词：氧化锆陶瓷 烧结 热等静压 力学性能 3Y-TZP 

分 类 号：TQ174.758[化学工程—陶瓷工业]