Effect of Different Sintering Temperature on the Performance of Mullite-Corundum Refractory Materials

Abstract:

Article Preview

Al (OH)3, Suzhou kaolin, AlF3 and V2O5 were premixed and pelleted to form the precursor for fabricating the mullite whisker, and then the precursor was added into the calcined bauxite and Suzhou kaolin mixture according to a certain mass percent. The mullite-corundum refractory materials with well-dispersed needle-like mullite formed in-situ were prepared. Through studying the effect of different sintering temperatures on the performances of the as-fabricated mullite-corundum refractory materials, it was concluded that the appropriate sintering temperature was 1450 °C. X-ray diffraction (XRD), scanning electron microscopy (SEM), water absorption, bending strength, coefficient of thermal expansion and the first thermal stress fracture factor were used to characterize and evaluate the materials. The results show that the sintering character and thermal expansion coefficient of the refractory materials increase with the rising sintering temperature. The bending strength of the refractory materials sintered at 1500 °C presented the maximum value and the first thermal stress fracture factor appeared the highest value at 1450 °C.

Info:

Periodical:

Advanced Materials Research (Volumes 750-752)

Edited by:

Jinglong Bu and Yun-Hae Kim

Pages:

521-524

Citation:

P. Li et al., "Effect of Different Sintering Temperature on the Performance of Mullite-Corundum Refractory Materials", Advanced Materials Research, Vols. 750-752, pp. 521-524, 2013

Online since:

August 2013

Export:

Price:

$38.00

[1] Zhang Li, Effects of additives on the properties of corundum-mullite composites[D]. Tianjin: Tianjin University, (2008).

[2] Zheng Jianping, The research of corundum-mullite multiphase kiln's stability of thermal shock resistance and design optimization[D]. Zhejiang: Zhejiang University, (2004).

[3] Zhao Qiang, Composition, microstructure and properties of high temperature mullite/corundum kiln furniture[D]. Xi'an: Xi'an University of Architecture and Technology, (2004).

[4] Chen C Y, Lan G S, Tuan W H, Preparation of mullite by there action sintering of kaolinite and alumina[J]. J. Eur. Ceram. Soc., 2000. (20): 2519-2525.

DOI: https://doi.org/10.1016/s0955-2219(00)00125-4

[5] Kong L B, Huang H, Zhang T S, et al, Growth of mullite whisker in mechano chemically activated oxides doped with WO3[J]. J. Eur. Ceram. Soc., 2003. 23(2): 2257-2264.

[6] Li Xiaoming, Huang Dexin, Zhou Qing, Study of the reaction temperature between Al2O3 and SiO2 ulfrafines[J]. Ceramics Engineering, 1998, 2(29): 15-19.

[7] Xu Fei, Preparation of silicon carbide ceramic foams combined with in-situ mullite whiskers[D]. Wuhan: Wuhan University of Technology. (2010).

[8] Liu Yanchun, Zeng Lingke, Zhu Jie, ect. Synthesis of mullite refractory using was te slag of aluminum factory[J]. Journal of Ceramics. 2010, (03): 484-489.

[9] Jia Jiangyi, Cao Zhenyuan, Lu Xiangyang. Property and microstructure of mullite-cordierite ceramic kiln furniture[J]. Refractories. 2004, (04).