Application Performance of Microporous Sintered Alumina in Alumina Magnesia Castables for Ladles

doi:10.19691/j.cnki.1004-4493.2020.02.002

China's Refractories ›› 2020, Vol. 29 ›› Issue (2): 6-10.DOI: 10.19691/j.cnki.1004-4493.2020.02.002

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Application Performance of Microporous Sintered Alumina in Alumina Magnesia Castables for Ladles

HE Jian, LYU Xusheng^*(), ZHANG Jialiang, ZHOU Wei, LI Yin

Jiangsu Jingxin New Materials Co., Ltd., Yangzhou 225264, China

Revised:2021-05-13 Online:2020-06-15 Published:2020-06-15
Contact: LYU Xusheng
About author:He Jian, born in 1983, finished his junior college education from Fuzhou Command College of The Chinese People's Armed Police Forces in 2006. He has been the general manager of Jiangsu Jingxin New Materials Co., Ltd. since 2015. He won many prizes such as Jiangdu District Chief Quality Award in 2014, Yangzhou City Mayor Quality Award in 2015, Top Ten Young Entrepreneurship Stars in Jiangdu District in 2016, and Advanced Quality Individuals in Jiangdu District in 2017.

Abstract

Abstract:

In this study, a kind of microporous sintered alumina was analyzed and applied. The microporous sintered alumina has a lot of nano and sub-micron closed pores in the crystals, the average pore size of 140 nm, and the thermal conductivity of 4.864 at 800 ℃, 38% lower than that of common sintered alumina. The microporous sintered alumina was used as the aggregates in alumina magnesia castables for ladles to replace the common sintered alumina. The properties of the microporous alumina castable were measured, and the temperature field of the ladle outer wall was simulated and calculated. The results show that the refractoriness under load (T_0.6) and the hot modulus of rupture (1 400 ℃, 0.5 h) of the microporous castable are the same as the common castable; the thermal conductivity at 800 ℃ decreases by 15%; the retention ratio of modulus of rupture increases by about 5% after five thermal shock cycles (1 100 ℃, water quenching); and the temperature of the ladle outer wall is reduced by 5-41 ℃.

Key words: microporous, sintered alumina, thermal conductivity, thermal shock resistance

HE Jian, LYU Xusheng, ZHANG Jialiang, ZHOU Wei, LI Yin. Application Performance of Microporous Sintered Alumina in Alumina Magnesia Castables for Ladles[J]. China's Refractories, 2020, 29(2): 6-10.

Figures/Tables 14

References 7

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Samples	Al₂O₃ /mass%	Bulk density /(g · cm^-3)	Apparent porosity /%	Closed porosity /%	Water absorption /%
Common sintered alumina	99.3	3.55	3.6	6.5	1.02
Microporous sintered alumina	99.2	3.50	3.8	7.6	1.09

Samples	Al₂O₃ /mass%	Bulk density /(g · cm^-3)	Apparent porosity /%	Closed porosity /%	Water absorption /%
Common sintered alumina	99.3	3.55	3.6	6.5	1.02
Microporous sintered alumina	99.2	3.50	3.8	7.6	1.09

Samples	25 ℃	300 ℃	500 ℃	800 ℃
Common sintered alumina	26.114	12.759	9.202	7.896
Microporous sintered alumina	25.851	9.725	5.604	4.864

Samples	25 ℃	300 ℃	500 ℃	800 ℃
Common sintered alumina	26.114	12.759	9.202	7.896
Microporous sintered alumina	25.851	9.725	5.604	4.864

Castables	Refrac-toriness under load, T_0.6 /℃	Hot modulus of rupture /MPa	Retention ratio of MOR after 5 thermal shock cycles /%	Thermal conductivity at 800 ℃ / (W·m^-1·K^-1)
Common castable	1 520	8.32	18.10	0.93
Microporous castable	1 518	8.24	22.57	0.79

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Application Performance of Microporous Sintered Alumina in Alumina Magnesia Castables for Ladles

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