相变和晶粒尺寸对二氧化钛陶瓷无压烧结行为的影响  

Effect of Phase Transformation and Grain Size on Pressureless Sintering Behavior for TiO_2 Ceramics

作　　者：景悦林[1] 陈沙鸥[1] 李达[2] 邵渭泉[1] 张永成[1] 栾伟娜[1] 

机构地区：[1]青岛大学物理科学学院,青岛266071 [2]青岛大学机电工程学院,青岛266071

出　　处：《青岛大学学报（自然科学版）》2006年第4期17-21,共5页Journal of Qingdao University(Natural Science Edition)

基　　金：青岛市自然科学基金项目(05-1-JC-89)

摘　　要：分别采用XRD和光学显微镜对亚微米和纳米TiO2粉体进行表征,通过恒速无压烧结,研究了相变和晶粒尺寸对二氧化钛粉体在不同升温速率下的烧结致密化过程和烧结行为的影响。结果表明,纳米锐钛矿、纳米金红石和亚微米锐钛矿型TiO2致密化开始温度分别是450、750和1 000℃;纳米锐钛矿、纳米金红石和亚微米锐钛矿型TiO2烧结致密化速率最高时所对应的温度分别是880、920和1 025℃。相变的存在可以降低烧结温度,加快烧结速率;粒径小的粉体烧结温度低,且致密度高。The grain size, particle photograph, and phase of sub-micro/nanometer powder of TiO2 were characterized by XRD and optical microscope. The green compacts were prepared using dry pressing and cold isostatic pressing. The samples were sintered pressureslessly at constant heating rate of 5℃/min using automatic high temperature dilatometer. The curves of shrinkage versus temperature were analyzed. The effect of phase transformation and grain size on the densification and sintering behavior were described for sub-micro/nanometer TiO2 ceramic. The results show that the densification onset temperature for anatase, futile nanometer TiO2 and anatase sub-micrometer TiO2 are 450 ℃, 750 ℃ and l 000 ℃, respectively. The temperature for the maximum densification rates are 880 ℃, 920 ℃ and 1 025 ℃, respectively. The phase transformation can accelerate the sintering rate. The fine grain size can reduce the sintering temperature and increase the densification.

关 键 词：相变 晶粒尺寸 二氧化钛 烧结曲线 烧结行为 

分 类 号：TB321[一般工业技术—材料科学与工程]