Effect of partial substitution of alumina–chromium slag for Al2O3 on microstructures and properties of Al2O3–SiC–C trough castables. Issue 9 (15th June 2019)

• Record Type: Journal Article
• Authors: Fan, Rundong; Zhao, Huizhong; Zhang, Han; Zhao, Pengda; Chen, Jianwei; Wang, Xianghui
• Is Part Of: Ceramics international. Volume 45:Issue 9(2019)
• Page Start: 11204
• Page End: 11215
• Publication Date: 2019-06-15
• Subjects: Alumina-chromium slag -- Substitution -- Abrasion resistance -- Oxidation resistance -- Slag resistance; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2019.01.253
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Alumina–chromium slag (ACS), a cheap and abundant refractory raw material comprising aluminum–chromium oxides and β-Al2 O3, is a byproduct of ferrochrome smelting. For this reason, we investigated the relationships between composition and mechanical properties, abrasion resistance, oxidation resistance, and resistance to iron slag erosion for Al2 O3 –SiC–C trough castables in which ACS was substituted for alumina. Due to the presence of β-Al2 O3 in ACS, the aluminum-chromium slag reacted with SiO2 to form a low-melting phase of albite and promoted the formation of mullite, which filled the pores at high temperatures and reduced the porosity, thereby promoting densification and strengthening of the sample. The cold mechanical properties of the sample and the normal temperature wear resistance were enhanced, but the high-temperature mechanical properties and the resistance to iron slag corrosion of the sample were impaired. According to the results of the anti-oxidation experiment, the presence of β-Al2 O3 in the ACS reduced the porosity and made the sample more dense, which remarkably improved oxidation resistance of the sample. For industrial production requirements, ACS substitution should not exceed 48 wt% due to of thermomechanical properties and anti-slag corrosion performance in Al2 O3 –SiC–C trough castables.