Corrosion and penetration behaviors of slag/steel on the corroded interfaces of Al2O3-C refractories: Role of Ti3AlC2. (October 2018)

• Record Type: Journal Article
• Authors: Chen, Junfeng; Chen, Liugang; Wei, Yaowu; Li, Nan; Zhang, Shaowei
• Is Part Of: Corrosion science. Volume 143(2018)
• Page Start: 166
• Page End: 176
• Publication Date: 2018-10
• Subjects: Ti3AlC2/MAX phases -- Corrosion resistance -- Molten steel -- Marangoni convection -- Degradation; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2018.08.022
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: The corrosion resistance of sample with 4 wt.% graphite and 6 wt.% Ti3 AlC2 increased 48% under the condition of dynamic corrosion, when compared with regular Al2 O3 -C refractories with 10 wt.% graphite. A complete corrosion process of Ti3 AlC2 along the slag's penetration direction and under a temperature gradient was elaborated. Degradation mechanisms and interactions of Al2 O3 -Ti3 AlC2 -Si-C refractories in contact with CaO-rich slag were studied, and the role of Ti3 AlC2 was elucidated. The penetration of molten steel in the refractories-steel/slag interface was restrained by controlling the infiltration pathways and the viscosity of local infiltrated molten steel. The controllable approaches for molten steel penetration were both originated from the degradation behavior of Ti3 AlC2 in the corroded interface. Abstract: In this study, the degradation behavior of Al2 O3 -Ti3 AlC2 -Si-C refractories and a complete degradation process of Ti3 AlC2 under a temperature gradient along the penetration direction were investigated by a dynamic corrosion at approximately 1630 °C. The degradation process of Ti3 AlC2 affected the local liquid components by assisting to form CaAl12 O19 and restrained CaO penetration via trapping into high-melting phase. On refractories-steel/slag interfaces affected by Marangoni convection, the molten steel penetration was suppressed in the samples with Ti3 AlC2 . A refined texture and increased viscosity, accompanying Ti3 AlC2 oxidation and dissolution in molten steel, blocked the pathways and restrained the penetration of molten steel.