BaO对CaO-Al<sub>2</sub>O<sub>3</sub>基保护渣熔化温度、结晶及微观结构的影响

doi:10.13228/j.boyuan.issn1005-4006.20210011

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Abstract CaO-Al₂O₃-based mold flux has showed great potential in solving reactivity problem for high-aluminum steel casting, but it still has problems such as strong crystallization ability and high melting temperature. Therefore, the influence of BaO on melting temperature, crystallization behavior and structure of CaO-Al₂O₃-CaF₂-B₂O₃-Na₂O-Li₂O-MgO multiple slag systems were investigated. The results showed that the addition of BaO can reduce the softening temperature and melting temperature. As an increased BaO, the trend of this reduction decreases.Ca₁₂Al₁₄O₃₃ and Ca₃B₂O₆ 2 phase precipitate into Ca₁₂Al₁₄O₃₃、Ca₃B₂O₆ and BaAl₂O₄ 3 phase precipitate with the addition of Bao. The crystallization ability has been decreased as an increased BaO. Ba²⁺ has a strong electricity charge compensation effect on [AlO₄]^5-, so that [AlO₄]^5- can exist stably, and the Al-O network is more tightly combined. It is difficult for free O^2- to enter the gap to destroy the bridge oxygen link, which leads to the slight increase of polymerization. This will reduce the atom diffusion ability, resulting in that the increase of crystallization kinetic barrier decreases the crystallization ability.

Key words： BaO CaO-Al₂O₃-based mlod flux melting temperature crystallization behavior structure

Received: 14 January 2021

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	FENG Xin
	YAO Wen
	LI Jiang-ling

Cite this article:

FENG Xin,YAO Wen,LI Jiang-ling. Effect of BaO on melting temperature, crystallization and structure of CaO-Al₂O₃ based mold flux[J]. CONTINUOUS CASTING, 2021, 40(2): 38-42.

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http://www.chinamet.cn/Jweb_lz/EN/10.13228/j.boyuan.issn1005-4006.20210011 OR http://www.chinamet.cn/Jweb_lz/EN/Y2021/V40/I2/38

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