Synthesis and high-pressure sintering of lanthanum magnesium hexaaluminate

被引：20

作者：

Zhang, Yanfei ^{[1
,2
]}

Li, Qin ^{[1
,2
]}

Ma, Xianfeng ^{[1
]}

Cao, Xueqiang ^{[1
]}

机构：

[1] Chinese Acad Sci, Changchun Inst Appl Chem, Key Lab Rare Earth Adv Mat & Valuable Utilizat Re, Changchun 130022, Peoples R China

[2] Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China

来源：

MATERIALS LETTERS | 2008年 / 62卷 / 6-7期

关键词：

ceramics; crystal structure; hardness; mechanical properties; sintering;

D O I：

10.1016/j.matlet.2007.07.039

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Lanthanum magnesium hexaaluminate is a very important ceramic material for high temperature applications. In this paper lanthanum magnesium hexaaluminate has been synthesized directly by solid-state reaction. The forming mechanism was investigated by XRD. The SEM photographs show that the prepared powders are made of hexagonal plates. These powders can be well sintered at the high temperature (1600 degrees C) under the high pressure (4.5 GPa), and the relative density reaches 94.8%. The hardness of the high-pressure sintered lanthanum magnesium hexaaluminate is tested to be 16.68 GPa, which is much larger than that of pressureless sintering. Toughness of high-pressure sintered lanthanum magnesium hexaalurninate is about 5.25 MPa m(1/2). (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：923 / 925

页数：3

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