Densification and grain growth during solid state sintering of LaPO4

被引：30

作者：

Bregiroux, Damien ^{[1
]}

Audubert, Fabienne ^{[2
]}

Bernache-Assollant, Didier ^{[3
]}

机构：

[1] Univ Paris 06, CNRS, UMR 7574, F-75252 Paris 05, France

[2] SPUA, DEC, DEN, Commissariat Energie Atom, F-13108 St Paul Les Durance, France

[3] Ecole Natl Super Mines, CIS, F-42023 St Etienne, France

来源：

CERAMICS INTERNATIONAL | 2009年 / 35卷 / 03期

关键词：

Sintering; Grain growth; Grain size; Microstructure-final; MONAZITE-TYPE COMPOUNDS; PHOSPHATE CERAMICS; LNPO(4) LN; LA; SOLUBILITY; GD; CE; IMMOBILIZATION; CONDUCTION; ACTINIDES;

D O I：

10.1016/j.ceramint.2008.05.005

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

This work is devoted to the kinetic study of densification and grain growth of LaPO4 ceramics. By sintering at a temperature close to 1500 degrees C, densification rate can reach up to 98% of the theoretical density and grain growth can be controlled in the range 0.6-4 mu m. Isothermal shrinkage measurements carried out by dilatometry revealed that densification occurs by lattice diffusion from the grain boundary to the neck. The activation energy for densification (E-D) is evaluated as 480 +/- 4 kJ mol(-1). Grain growth is governed by lattice diffusion controlled pore drag and the activation energy (E-G) is found to be 603 +/- 2 kJ mol(-1). The pore mobility is so low that grain growth only occurs for almost fully dense materials. (C) 2008 Elsevier Ltd and Techna. Group S.r.l. All rights reserved.

引用

页码：1115 / 1120

页数：6

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