The preparation and properties of high-strength porous mullite ceramics by a novel non-toxic gelcasting process

被引：33
作者：
Li, Xiang [1 ,2 ]
Tao, Mengya [1 ,2 ]
Pan, Mengbo [1 ,2 ]
Liu, Wei [1 ,2 ]
Gao, Zhengxia [1 ,2 ]
Yuan, Huiyu [1 ,2 ]
Ma, Chengliang [1 ,2 ]
机构：
[1] Zhengzhou Univ, Sch Mat Sci & Engn, 100 Sci Ave, Zhengzhou 450001, Peoples R China
[2] Zhengzhou Univ, Henan Key Lab High Temp Funct Ceram, 75 Daxue Rd, Zhengzhou 450052, Peoples R China
来源：
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2022年 / 42卷 / 13期
基金：
中国国家自然科学基金;
关键词：
-PGA; Foam-gelcasting method; Porous mullite ceramics; Thermal insulation; THERMAL-CONDUCTIVITY; ZIRCONIA CERAMICS; PORE STRUCTURE; ALUMINA; FOAMS; FABRICATION; EFFICIENT; POROSITY; GELATION;
D O I：
10.1016/j.jeurceramsoc.2022.06.050
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：
A novel approach to fabricate porous mullite ceramics with homogeneous pore size and high-strength using green non-toxic and cost-effective poly-gamma-glutamic acid (gamma-PGA) gelling system was reported for the first time. Effect of gamma-PGA addition, additive amount and solid loading on rheological behavior of the slurries, and microstructure and properties of samples were investigated systematically. By optimizing the solid loading of mullite samples, we are able to get the sample with small pores (< 200 mu m) dominating (93.3% of the total pores), and compressive strength of the sample reaches up to 26.62 MPa. In addition, the mullite ceramics exhibited high porosity of 75.7% with low thermal conductivity of 0.279 W/(m.K) at room temperature. This study not only provides a green and non-toxic gelling system but also offers porous mullite ceramics with low thermal conductivity and excellent mechanical strength as an energy-saving thermal insulation material.
引用
收藏
页码：6015 / 6024
页数：10
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