Microstructure and physical properties of steel-ladle purging plug refractory materials

Bin Long; Gui-ying Xu; Buhr Andreas

doi:10.1007/s12613-017-1394-5

Volume 24 Issue 2

Feb. 2017

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2017 > 24(2): 186-193

Bin Long, Gui-ying Xu, and Buhr Andreas, Microstructure and physical properties of steel-ladle purging plug refractory materials, Int. J. Miner. Metall. Mater., 24(2017), No. 2, pp. 186-193. https://doi.org/10.1007/s12613-017-1394-5

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Bin Long, Gui-ying Xu, and Buhr Andreas, Microstructure and physical properties of steel-ladle purging plug refractory materials, Int. J. Miner. Metall. Mater., 24(2017), No. 2, pp. 186-193. https://doi.org/10.1007/s12613-017-1394-5

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Research Article

Microstructure and physical properties of steel-ladle purging plug refractory materials

+ Author Affiliations

Corresponding author:
Gui-ying Xu E-mail: guiyingxu@126.com
Received: 11 June 2016; Revised: 7 August 2016; Accepted: 22 September 2016

Abstract

Abstract

Three different castables were prepared as steel-ladle purging-plug refractory materials:corundum-based low-cement castable (C-LCC), corundum-spinel-based low-cement castable (C-S-LCC), and no-cement corundum-spinel castable (C-S-NCC) (hydratable alumina ρ-Al₂O₃ bonded). The properties of these castables were characterized with regard to water demand/flow ability, cold crushing strength (CCS), cold modulus of rupture (CMoR), permanent linear change (PLC), apparent porosity, and hot modulus of rupture (HMoR). The results show the CCS/CMoR and HMoR of C-LCC and C-S-LCC are greater than those of the castable C-S-NCC. According to the microstructure analysis, the sintering effect and the bonding type of the matrix material differ among the three castables. The calcium hexaluminate (CA₆) phase in the matrix of C-LCC enhances the cold and hot mechanical strengths. In the case of C-S-LCC, the CA₆ and 2CaO·2MgO·14Al₂O₃ (C₂M₂A₁₄) ternary phases generated from the matrix can greatly increase the cold and hot mechanical strengths. In the case of the no-cement castable, sintering becomes difficult, resulting in a lower mechanical strength.
- refractory materials;
- purging plugs;
- castable;
- physical properties;
- microstructure

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References

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