Comparative study of B4C, Mg2B2O5, and ZrB2 powder additions on the mechanical properties, oxidation, and slag corrosion resistance of MgO–C refractories. Issue 10 (15th May 2022)

• Record Type: Journal Article
• Authors: Liu, Zhaoyang; Yu, Jingkun; Wang, Xiangnan; Ma, Pengcheng; Gu, Wenbiao; Wen, Jun; Wei, Shan; Zhang, Xiaofang; Yan, Zhengguo; Wen, Tianpeng; Yuan, Lei; Ma, Beiyue
• Is Part Of: Ceramics international. Volume 48:Issue 10(2022)
• Page Start: 14117
• Page End: 14126
• Publication Date: 2022-05-15
• Subjects: MgO–C refractories -- Boron-containing additives -- Oxidation resistance -- Mechanical properties -- Slag corrosion resistance; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.01.297
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Boron-containing additives are used to improve the oxidation resistance of carbon-containing refractories; however, their effects on the mechanical properties and slag corrosion resistance of the refractories have rarely been studied. In this work, B4 C, Mg2 B2 O5, and ZrB2 powders were incorporated into low-carbon MgO–C refractories to study their effects on the mechanical properties, oxidation resistance, and slag corrosion resistance of the refractories. The relationships between these properties and the microstructure and phase evolution were also studied. The results show that the flexural strengths of the MgO–C refractories at high temperatures are closely related to the apparent porosity and formation of an Mg3 B2 O6 phase. The oxidation resistances are greatly improved after the introduction of boron-containing additives into the MgO–C refractories in terms of both thermodynamical aspects and the filling of voids and pores. The most effective antioxidant is B4 C, followed by the ZrB2 and Mg2 B2 O5 powders. The mechanisms through which the vanadium-containing slag attacks the MgO–C refractories mainly include the dissolution of magnesia to form melting phases, penetration through pores, and redox reaction with carbon.