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- Title
富铝尖晶石微粉对刚玉-尖晶石浇注料关键使用性能的影响.
- Authors
肖 雄; 魏耀武; 周 辉; 颜 林; 陈志强; 邵长波
- Abstract
The study aims to research the influence of alumina-rich spinel micropowders with different alumina contents on the key performances of corundum-spinel castables. The corundum-spinel castables were prepared using tabular corundum particles (6-3, 3-1, ≤1 mm) and spinel particles (≤1 mm) as the aggregates, tabular corundum fines (≤0. 074 mm), spinel fines (≤0. 032 mm ), active α-Al2O3 micropowder (d90=10. 0 μm) and magnesium aluminate spinel micropowders with different alumina contents as the fine powder, Secar 71 cement as the binder. The mass ratio of aggregates to fines was 66. 5∶33. 5. Fixing the addition of alumina-rich spinel micropowders at 7 mass%, the effects on the microstructure and the key performances of the corundum-spinel castables were studied. The results show that:(1)the addition of aluminum-rich spinel micropowder is helpful to improve the hot modulus of rupture, the thermal shock resistance, and the slag resistance of the castables; a large amount of calcium hexaluminate forms and uniformly distributes on the slag-castables boundaries, hindering the penetration of ladle refining slag to the castables; (2)when the alumina content in alumina-rich spinel micropowder is 90%, the developed sample has good slag penetration resistance.
- Publication
Refractories / Naihuo Cailiao, 2022, Vol 56, Issue 6, p499
- ISSN
1001-1935
- Publication type
Article
- DOI
10.3969/j.issn.1001-1935.2022.06.009