Influence of Additives on the Mechanical Properties and Corrosion Behavior of ZrO2-BN Composites against Molten Steel
ZrO2-BN composites with different additives have been fabricated by hot-pressing at 1600℃ for 60min in vacuum.The mechanical properties and corrosion resistance of composites have been investigated systematically.The composite with B2O3-Si3N4-CaF2 as additive has excellent mechanical properties.The flexural strength,fractural toughness and Vickers hardness can reach 307MPa,5.82 MPa·m1/2 and 3.09GPa,respectively.However,the corrosion resistance of composite with B2O3-Si3N4-CaF2 as additive has poor corrosion resistance due to the dissolution of Si3N4 and CaF2 in molten steel.When using B2O3-SiC as additive,the corrosion resistance of composite has been improved effectively and the thickness of corrosion layer is 100μm against 45# steel at 1600℃ for 30min.The corroded layer is formed by porosities and remained ZrO2 phase at interface between composite and steel,which as a protective layer to obstruct the infiltration of liquid steel according to the EDS analysis.Meanwhile,a new corrosion patch is produced with the residual porosities when low-molten point phases dissolution in molten steel.The molten steel infiltrates in the corrosion patch and promotes further corrosion of composite by chemical reaction between BN and the dissolved oxygen.
CHEN Lei SHEN Haifeng WANG Yujin ZHOU Yu
Institute for Advanced Ceramics, Harbin Institute of Technology, Harbin, 150001, P.R.China
国际会议
The 6th International Symposium on Refractories (第六届国际耐火材料会议)
郑州
英文
207-210
2012-10-18（万方平台首次上网日期，不代表论文的发表时间）