Preparation of mullite ceramics with equiaxial grains from powders synthesized by the sol-gel method

被引：14

作者：

Chen, Long ^{[1
,2
,3
]}

Wang, Zhengjuan ^{[1
,3
]}

Xue, Zhenhai ^{[1
,3
]}

Zhou, Guohong ^{[1
,2
,3
]}

Wang, Shiwei ^{[1
,2
,3
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China

[2] Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China

[3] Chinese Acad Sci, Shanghai Inst Ceram, Key Lab Transparent Optofunct Inorgan Mat, Shanghai 200050, Peoples R China

来源：

CERAMICS INTERNATIONAL | 2022年 / 48卷 / 04期

基金：

上海市自然科学基金; 国家重点研发计划;

关键词：

Mullite ceramics; Alumina; Sol-gel; Mechanical and optical properties; TRANSPARENT; ALUMINA; MICROSTRUCTURE; FABRICATION;

D O I：

10.1016/j.ceramint.2021.11.011

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：

Four different alumina content of mullite ceramics were fabricated by powders synthesized using the sol-gel method. The synthesis process of powders, microstructure evolution, mechanical and optical properties of the mullite ceramics were studied. The XRD results showed that the precursors transformed into aluminosilicate spinel phase at 1000 degrees C and mullite phase at 1200 degrees C. Equiaxial grains were easy to form in the alumina-rich mullite ceramics while elongated grains were easy to form in the alumina-poor mullite ceramics. With the increase of alumina content, the grain size of the samples firstly increased and then decreased, the number of elongated grains decreased while equiaxed grains increased. The flexural strength, compression strength, fracture toughness, and Vickers hardness all decreased firstly and then increased. While the infrared transmittance increased firstly and then decreased. The transmittance at 4 mu m (thickness of 0.75 mm) of the ceramics containing 66mol% Al2O3 reached the highest (72%) when sintered at 1780 degrees C because of the equiaxial grains.

引用

页码：4754 / 4762

页数：9

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