Ceramic nanocomposites obtained by sol-gel coating of submicron powders

被引：17

作者：

Boulle, A ^{[1
]}

Oudjedi, Z ^{[1
]}

Guinebretière, R ^{[1
]}

Soulestin, B ^{[1
]}

Dauger, A ^{[1
]}

机构：

[1] ENSCI, UMR 6638, CNRS, F-87065 Limoges, France

来源：

ACTA MATERIALIA | 2001年 / 49卷 / 05期

关键词：

sol-gel; coating; nanocomposites; microstructure; grain growth;

D O I：

10.1016/S1359-6454(00)00366-9

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

MgAl2O4-ZrO2 nanocomposites were fabricated by conventional sintering of composite powders obtained by sol-gel coating of a submicron spinel powder. In the composite powder the zirconia grains remain narrow sized and completely tetragonal even after being heat treated at temperatures where a free xerogel is completely monoclinic. The sintered material exhibits a dense, fine and highly homogeneous microstructure. The zirconia nanoparticles are located at both inter- and intragranular positions and exhibit heteroepitaxial relationships with the surrounding crystals. Tetragonal zirconia seems to be stabilised by an interface effect. Both the scale of the microstructure and the fraction of intragranular grains were controlled by adjusting the mean grain size of spinel grains before coating and sintering conditions. (C) 2001 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.

引用

页码：811 / 816

页数：6

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