Synthesis and characterization of reaction-bonded calcium alumino-titanate-bauxite-SiC composite refractories in a reducing atmosphere

被引:14
作者
Chen, Jianwei [1 ]
Zhao, Huizhong [1 ]
Yu, Jun [1 ]
Zhang, Han [1 ]
Li, Zhengkun [2 ]
Zhang, Jiaqin [2 ]
机构
[1] Wuhan Univ Sci & Technol, State Key Lab Refractory & Met, Wuhan 430081, Hubei, Peoples R China
[2] Jiangsu Jingxin New Mat Co Ltd, Yangzhou 225265, Jiangsu, Peoples R China
关键词
CAT-bauxite-SiC; Low melting phase; Buried sintering; High-temperature performance; Alkali resistance; TITANIUM SLAG; MICROSTRUCTURE; ILMENITE; DIOXIDE;
D O I
10.1016/j.ceramint.2018.05.183
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
To take full advantage of the excellent properties of CA(6) present in calcium alumino-titanate (CAT) and reduce the formation of the low melting point phase (anorthite), CAT-bauxite-SiC composite refractories were fabricated under buried sintering in order to achieve low thermal expansion, superior high-temperature performance, and increased alkali resistance. Furthermore, the corrosion mechanism of K vapor was investigated by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM). Results show that CA(6) present in CAT can be partially retained and the hot strength of CAT-bauxite-SiC composites slowly decreases when the amount of CAT added is less than 21.6 wt%. The cold strength and bulk density decrease with the CAT content, and the residual ratio of MOR firstly decreases and subsequently increases with the CAT content. For the specimens with CAT additions, 43.2 wt% CAT results in the highest volume expansion at high temperatures. It is proposed that the corrosion mechanism of CAT aggregates under buried sintering is as follows: 1) K vapors penetrate into the CAT with high CA(6) content through the lamellar CA(6) gap and deposit on the inner regions of CAT; and 2) K vapors react with corundum and anorthite present in CAT and cause the microstructural destruction of CAT due to a decrease in the amount of the Al2O3-CaO-SiO2 liquid phase in the CAT. The alkali resistance of the CAT-bauxiteSiC composites decreases as the CAT content increases, which is attributed to poor sintering densification and high apparent porosity.
引用
收藏
页码:15338 / 15345
页数:8
相关论文
共 25 条
[1]   The decrepitation of solidified high titania slags [J].
Bessinger, D ;
Geldenhuis, JMA ;
Pistorius, PC ;
Mulaba, A ;
Hearne, G .
JOURNAL OF NON-CRYSTALLINE SOLIDS, 2001, 282 (01) :132-142
[2]   Sintering and microstructural characterization of calcium alumino-titanate-bauxite-SiC composite refractories [J].
Chen, Jianwei ;
Zhao, Huizhong ;
Zhang, Han ;
Li, Zhengkun ;
Zhang, Jiaqin .
CERAMICS INTERNATIONAL, 2018, 44 (09) :10934-10939
[3]   Effect of the calcium alumino-titanate particle size on the microstructure and properties of bauxite-SiC composite refractories [J].
Chen, Jianwei ;
Zhao, Huizhong ;
Zhang, Han ;
Li, Zhengkun ;
Zhang, Jiaqin .
CERAMICS INTERNATIONAL, 2018, 44 (06) :6564-6572
[4]   Effect of partial substitution of calcium alumino-titanate for bauxite on the microstructure and properties of bauxite-SiC composite refractories [J].
Chen, Jianwei ;
Zhao, Huizhong ;
Zhang, Han ;
Li, Zhengkun ;
Zhang, Jiaqin .
CERAMICS INTERNATIONAL, 2018, 44 (03) :2934-2940
[5]   Microstructure development in calcium hexaluminate [J].
Domínguez, C ;
Chevalier, J ;
Torrecillas, R ;
Fantozzi, G .
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 2001, 21 (03) :381-387
[6]   A simple solvothermal process to synthesize CaTiO3 microspheres and its photocatalytic properties [J].
Dong, Weixia ;
Song, Bin ;
Meng, Weijie ;
Zhao, Gaoling ;
Han, Gaorong .
APPLIED SURFACE SCIENCE, 2015, 349 :272-278
[7]  
Langmesser P. W., 1973, PROCESS LEADING PROD
[8]   Soda ash roasting of titania slag product from Rosetta ilmenite [J].
Lasheen, T. A. .
HYDROMETALLURGY, 2008, 93 (3-4) :124-128
[9]   Evaluation of aluminum dross as raw material for high-alumina refractory [J].
Li, Apeng ;
Zhang, Haijun ;
Yang, Huaming .
CERAMICS INTERNATIONAL, 2014, 40 (08) :12585-12590
[10]  
Li T. Q., NAIHUOCAILIAO, V38, P318