Sintering and Microstructure of LaPO_4 Ceramic  

作　　者：刘海燕 刘家臣 朱玉峰 

机构地区：[1]Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin 300072, China

出　　处：《Journal of Rare Earths》2005年第S1期142-144,共3页稀土学报（英文版）

基　　金：ProjectsupportedbytheNationalNatureScienceFundofChina(50372044)

摘　　要：To provide preliminary information for design of rare earth phosphate-contained machinable ceramic, sintering and microstructure of LaPO_4 were investigated. The results show that LaPO_4 can be sintered independently without other components from 1580 to 1620 ℃, and its grains are ellipsoidal or orbicular in surface but multilayer in the inside. The fracture of LaPO_4 ceramic presents transgranular along the larger grains and along-granular for the smaller grains. It is supposed that multi-layer structural LaPO_4 may contribute to machinabilities for those LaPO_4-contained ceramic duo to its low cleavage energy, which provides a easy path for cracks propagate of material removing, also leads crack deflections, branching and blunting helping to prevent macroscopic fractures from propagation beyond the local machining area.To provide preliminary information for design of rare earth phosphate-contained machinable ceramic, sintering and microstructure of LaPO_4 were investigated. The results show that LaPO_4 can be sintered independently without other components from 1580 to 1620 ℃, and its grains are ellipsoidal or orbicular in surface but multilayer in the inside. The fracture of LaPO_4 ceramic presents transgranular along the larger grains and along-granular for the smaller grains. It is supposed that multi-layer structural LaPO_4 may contribute to machinabilities for those LaPO_4-contained ceramic duo to its low cleavage energy, which provides a easy path for cracks propagate of material removing, also leads crack deflections, branching and blunting helping to prevent macroscopic fractures from propagation beyond the local machining area.

关 键 词：LaPO_4 SINTER multilayer structure MACHINABILITY 

分 类 号：TQ174[化学工程—陶瓷工业]