Low sintering shrinkage porous mullite ceramics with high strength and low thermal conductivity via foam-gelcasting

被引:16
作者
Lin, Lang [1 ]
Wang, Hengchang [1 ]
Xia, Chenhe [2 ]
Xu, Jie [1 ,5 ,6 ]
Meng, Xuanyu [1 ]
Yang, Runwu [1 ]
Hu, Guoxin [3 ,7 ]
Qu, Yanan [4 ]
Gao, Feng [1 ,5 ]
机构
[1] Northwestern Polytech Univ, Sch Mat Sci & Engn, State Key Lab Solidificat Proc, MIIT Key Lab Radiat Detect Mat & Devices, Xian, Peoples R China
[2] Northwestern Polytech Univ, Queen Mary Univ London Engn Sch, Xian, Peoples R China
[3] Shaanxi Normal Univ, Sch Mat Sci & Engn, Xian, Peoples R China
[4] China Acad Railway Sci Corp Ltd, Railway Engn Res Inst, Beijing, Peoples R China
[5] Northwestern Polytech Univ, NPU QMUL Joint Res Inst Adv Mat & Struct, Xian, Peoples R China
[6] Northwestern Polytech Univ, Sch Mat Sci & Engn, State Key Lab Solidificat Proc, MIIT Key Lab Radiat Detect Mat & Devices, Xian 710072, Peoples R China
[7] Shaanxi Normal Univ, Sch Mat Sci & Engn, Xian 710119, Peoples R China
基金
中国国家自然科学基金;
关键词
foam-gelcasting; mullite; porous ceramics; sintering shrinkage; thermal conductivity; IN-SITU GROWTH; HIGH-POROSITY; WHISKERS; SOL;
D O I
10.1111/jace.19035
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
Excessive sintering shrinkage leads to severe deformation and cracking, affecting the microstructure and properties of porous ceramics. Therefore, reducing sintering shrinkage and achieving near-net-size forming is one of the effective ways to prepare high-performance porous ceramics. Herein, low-shrinkage porous mullite ceramics were prepared by foam-gelcasting using kyanite as raw material and aluminum fluoride (AlF3) as additive, through volume expansion from phase transition and gas generated from the reaction. The effects of AlF3 content on the shrinkage, porosity, compressive strength, and thermal conductivity of mullite-based porous ceramics were investigated. The results showed that with the increase of content, the sintering shrinkage decreased, the porosity increased, and mullite whiskers were produced. Porous mullite ceramics with 30 wt% AlF3 content exhibited a whisker structure with the lowest shrinkage of 3.5%, porosity of 85.2%, compressive strength of 3.06 +/- 0.51 MPa, and thermal conductivity of 0.23 W/(m center dot K) at room temperature. The temperature difference between the front and back sides of the sample reached 710 degrees C under high temperature fire resistance test. The low sintering shrinkage preparation process effectively reduces the subsequent processing cost, which is significant for the preparation of high-performance porous ceramics.
引用
收藏
页码:3800 / 3811
页数:12
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