Porous to dense LaPO4 sintered ceramics for advanced refractories

被引：33

作者：

Sujith, S. S. ^{[1
]}

Kumar, S. L. Arun ^{[2
]}

Mangalaraja, R. V. ^{[3
]}

Mohamed, A. Peer ^{[1
]}

Ananthakumar, S. ^{[1
]}

机构：

[1] CSIR Natl Inst Interdisciplinary Sci & Technol, Div Mat Sci & Technol, Trivandrum 695019, Kerala, India

[2] Natl Inst Technol, Dept Mat Sci & Engn, Calicut 673601, Kerala, India

[3] Univ Concepcion, Dept Mat Engn, Adv Ceram & Nanotechnol Lab, Concepcion, Chile

来源：

CERAMICS INTERNATIONAL | 2014年 / 40卷 / 09期

关键词：

Sintering; Lanthanum phosphate; Refractory; Thermal expansion coefficient; HIGH-TEMPERATURE STABILITY; LANTHANUM PHOSPHATE; ALUMINA; BEHAVIOR; MICROSTRUCTURE; REPO4; RE; LA; CE;

D O I：

10.1016/j.ceramint.2014.06.125

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：

Lanthanum phosphate (LaPO4), a low thermal conducting and machinable ceramic, exhibits attractive non-reactivity with molten metals, which makes it a promising functional refractory for metallurgical field. However, the high thermal expansion and abnormal grain growth during sintering limit its potential applications in industrial refractories. In the present work, the effect of calcination temperature on sintering of LaPO4 ceramics was investigated. The LaPO4 powder was synthesized via a precipitation method using lanthanum nitrate and orthophosphoric acid. The LaPO4 precipitate was calcined at different temperatures 400, 600, 800, 1000, 1200 and 1400 degrees C and the effects of calcination temperature on phase stability, particle growth and morphology were studied. The calcined powders were sintered as compacted discs at different temperatures, 1350, 1450 and 1550 degrees C. The micro-structural changes and densification behavior of the sintered samples were systematically investigated. Chemical resistance of sintered LaPO4 ceramics under acidic and basic conditions was also carried out. The thermal shock resistance of the material was evaluated by a water quenching method. Chemically inert, fine-grained and dense LaPO4 refractory ceramic was successfully fabricated with thermal expansion coefficient controlled to a moderate value of 5 x 10(-6) K-1 from the original value of 10 x 10(-6) K-1. (c) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

引用

页码：15121 / 15129

页数：9

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