超高压辅助烧结纳米陶瓷  

Sintering nanocrystalline ceramics using ultra-high pressure assisted approach

作　　者：肖长江[1,2] 靳常青[2] 王晓慧[3] 

机构地区：[1]河南工业大学材料科学与工程学院,河南郑州450007 [2]中国科学院物理研究所,北京100080 [3]清华大学材料科学与工程系新型陶瓷和精细工艺国家重点实验室,北京100084

出　　处：《功能材料》2007年第A06期2127-2129,共3页Journal of Functional Materials

基　　金：基金项目：国家重点基础研究发展计划（973计划）资助项目（2002CB613301）;河南工业大学博士启动基金资助项目（2007BS012）

摘　　要：10nm钛酸钡粉用两种方法烧结得到致密的钛酸钡陶瓷。在6GPa的超高压辅助条件下烧结得到的钛酸钡陶瓷的晶粒大小约为30nm；在常规的无压条件下烧结得到的钛酸钡陶瓷的晶粒大小约为1200nm。研究表明，由于超高压能够压碎纳米粉体中的团聚体、增加烧结的驱动力、降低戍核的势垒而使戍核速率增加和由于扩散能力的降低而使生长速率减小，所以超高压烧结能在较低的温度和较短的时间内得到致密的纳米钛酸钡陶瓷。10nm raw BaTiO3 powder was sintered by two approaches to obtain dense BaTiO3 ceramics. The grain size of BaTiO3 ceramics sintered by ultra-high pressure assisted method at 6GPa is about 30 nm; the second way was that the raw powders were sintered at ambient pressure. The results indicated that during the ultra-high pressure assisted sintering, the agglomerates in nano powders were broken down. the densification was significantly increased, the nucleation rate is increased due to reducing the energy barrier for nucleation and the growth rate is reduced due to the decrease of diffusivity. Thus high pressure enables the specimen to be fabricated under relatively lower temperature and shorter period that assures to obtain dense nanocrystalline ceramics.

关 键 词：钛酸钡 超高压 纳米陶瓷 

分 类 号：TB34[一般工业技术—材料科学与工程]