关键词: 硅烷偶联剂, 钢包, 无碳化, 抗侵蚀性, 涂层

Abstract: In response to the carbon-free requirements of ladle refractories,a coating slurry was prepared using calcined α-Al₂O₃ powder and yttrium-stabilized zirconia as coating fillers and silane coupling agent (KH-560) as a dispersant,with the addition of a magnesia-aluminia binder.The slurry was brushed onto the surface of a corundum-magnesium aluminate spinel substrate with sizes of 40 mm×40 mm×10 mm,and the coated sample was obtained after the heat treatment at 1 600 ℃ for 1 h.The effects of the KH-560 additions (0,0.5%,1%,1.5%,2%,2.5%,and 3% of the coating filler mass) on the slurry properties and the corrosion resistance of the coating were investigated.The results show that:(1)at room temperature,KH-560 dehydrates and condenses with the hydroxylated Al₂O₃ surface to form a uniform adsorption layer,whose steric hindrance effect reduces the surface tension and viscosity of the slurry,significantly improving its stability;(2)after the heat treatment at 1 600 ℃,mullite is generated by the chemical bonding of KH-560 and Al₂O₃,strengthening the bonding strength between the coating and the substrate;(3)the slag corrosion resistance test shows that,compared with the coated sample without KH-560,the aggregate edges at the corrosion interface of the sample with 1% KH-560 remain intact,the matrix shows no liquid-phase infiltration,and the corrosion index is reduced by 69.8%;(4)the optimal KH-560 addition is 1%.

Key words: silane coupling agent, ladles, carbon-free, corrosion resistance, coatings