Effect of Al Powder and Si Powder Additions on Structure and Properties of Unburned Magnesium Aluminate Spinel Refractories

doi:10.19691/j.cnki.1004-4493.2023.03.004

China's Refractories ›› 2023, Vol. 32 ›› Issue (3): 14-19.DOI: 10.19691/j.cnki.1004-4493.2023.03.004

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Effect of Al Powder and Si Powder Additions on Structure and Properties of Unburned Magnesium Aluminate Spinel Refractories

ZHOU Lianzhuo, WANG Zhoufu^*, WANG Xitang, LIU Hao, MA Yan, QUAN Zhenghuang

The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China

Online:2023-09-15 Published:2023-11-07
Contact: *e-mail: whwangzf@126.com
About author:Zhou Lianzhuo was born in 1995. In June 2022, he obtained his master’s degree from Wuhan University of Science and Technology. During his study, he was mainly engaged in the research on the effect of different additives on the properties of magnesium aluminate spinel carbon refractories. At present, he works in Qingdao Yunlu Advanced Technology Co., Ltd., mainly engages in the research on the corrosion of iron-based amorphous alloy slag on refractories.

Abstract

Abstract: Unburned magnesium aluminate spinel refractories were prepared using sintered magnesium aluminate spinel as the main raw material, phenolic resin as the binder, aluminum powder (2%, 4%, and 6% by mass) and silicon powder (when Al powder addition is 4%, Si powder addition varies: 1% and 2%, by mass) as additives. The effects of the Al powder and Si powder additions on the properties and microstructure of the refractories heat treated at different temperatures (1 000, 1 400, and 1 600 ℃ for 3 h) were studied. The results show that the Al powder addition can greatly enhance the cold modulus of rupture of the samples fired at 1 000 or 1 400 ℃, and meanwhile AlN reinforcement phase forms in the matrix, which greatly improves the hot modulus of rupture of the samples at 1 400 ℃; however, the heat treatment at 1 600 ℃ has little influence on the strength; the addition of Al powder and Si powder results in the formation of low melting point phases, greatly reducing the hot modulus of rupture. However, the low melting point phases promote sintering, which enhances the density and the cold modulus of rupture, and decreases the volume change during heating. The samples added with Al and Si all have higher cold modulus of rupture than those added with Al powder only.

Key words: aluminum powder, silicon powder, magnesium aluminate spinel, unburned refractories, strength

ZHOU Lianzhuo, WANG Zhoufu, WANG Xitang, LIU Hao, MA Yan, QUAN Zhenghuang. Effect of Al Powder and Si Powder Additions on Structure and Properties of Unburned Magnesium Aluminate Spinel Refractories[J]. China's Refractories, 2023, 32(3): 14-19.

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Effect of Al Powder and Si Powder Additions on Structure and Properties of Unburned Magnesium Aluminate Spinel Refractories

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