Preparation and characterization of porous anorthite ceramics from red mud and fly ash

被引:13
|
作者
Xiang, Weiheng [1 ]
Ding, Qingjun [1 ]
Zhang, Gaozhan [2 ]
机构
[1] Wuhan Univ Technol, State Key Lab Silicate Mat Architectures, Wuhan, Peoples R China
[2] Anhui Jianzhu Univ, Coll Mat Sci & Chem Engn, Hefei, Anhui, Peoples R China
基金
中国国家自然科学基金;
关键词
compressive strength; densification; fly ash; porous ceramics; red mud; thermal conductivity; THERMAL-SHOCK RESISTANCE; ZINC MINE TAILINGS; MECHANICAL STRENGTH; COMPOSITE CERAMICS; MEMBRANE SUPPORTS; MULLITE; FOAMS; PERFORMANCE; SPODUMENE; MICROSTRUCTURE;
D O I
10.1111/ijac.13148
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
The porous anorthite ceramics with high porosity, good mechanical strength and low heat conductivity were prepared using red mud and fly ash as raw materials via the pore forming method. The effects of sintering temperature and fly ash on phase evolution, densification, compressive strength, thermal conductivity and microstructure of the ceramic materials were investigated. The results showed that the compressive strength of the porous ceramics had an obvious improvement with the increase in fly ash, and the densification and heat conductivity decreased firstly and then increased. In particular, specimen S2 containing 30 wt% red mud and 40 wt% fly ash sintered at 1150 degrees C had the better performances. It had the water absorption of 18.18%, open porosity of 38.52%, bulk density of 1.29 g/cm(3), compressive strength of 42.46 MPa, and heat conductivity of 1.24 W/m.K. X-ray diffraction analysis indicated that mullite, anorthite, a-quartz, and diopside ferrian were the dominant phases in the specimens. Scanning electron microscopy micrographs illustrated that plenty of open pores with strip shape and closed pores with axiolitic shape existed in the specimens. Furthermore, the existence of mullite could prevent crack propagation to enhance the energy of inter-granular fracture. It endowed the porous anorthite ceramics with high porosity, good compressive strength, and low heat conductivity.
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页码:113 / 121
页数:9
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