Corrosion mechanism of Al2O3–SiC–C refractory by SiO2–MgO-based slag. Issue 18 (15th December 2020)

• Record Type: Journal Article
• Authors: Wu, Muhan; Huang, Ao; Yang, Shuang; Gu, Huazhi; Fu, Lvping; Li, Guangqiang; Dong, Hongyuan
• Is Part Of: Ceramics international. Volume 46:Issue 18(2020)Part A
• Page Start: 28262
• Page End: 28267
• Publication Date: 2020-12-15
• Subjects: Al2O3–SiC–C refractory -- SiO2–MgO-Based slag -- Corrosion mechanism -- Crack growth; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2020.07.327
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The development of high value-added products prepared by slag has been restricted by the severe damage to refractories occurring during SiO2 –MgO-based slag melting. In the current study, the Al2 O3 –SiC–C refractories were selected to conduct static resistance tests with SiO2 –MgO-based slag in air and reducing atmospheres. The results show favorable corrosion resistance but poor permeability resistance in both atmospheres. The poor permeability can be attributed to the cracking of brown fused alumina aggregates caused by volume expansion during the formation of magnesium aluminate spinel. In addition, a model of crack growth for the aggregate is proposed to illustrate the corrosion mechanism of the Al2 O3 –SiC–C refractories. It is indicated that the crack growth of the aggregate proceeds mainly along the normal direction based on the calculation of the radial and normal lengths of the crack.