关键词: 稀土氧化物, 防堵内衬, 浸入式水口, 界面反应

Abstract: The development of refractories with weak reaction to rare earth inclusions is an important direction to solve the problem of the nozzle clogging of rare earth steel.La₂Ce₂O₇,La₂Zr₂O₇,and LaAlO₃ powders were synthesized using the high-temperature solid state method with La₂O₃,CeO₂,ZrO₂,La₂S₃,and Al₂O₃(particle sizes of 5-10 μm) as raw materials,firing at 1 400 ℃ for 2 h.Subsequently,La₂Ce₂O₇,La₂Zr₂O₇,and Y₂O₃ powders were pressed into 30 mm×7 mm substrate samples with PVA as a binder,and equal amounts of La₂O₃,La₂S₃,and LaAlO₃ powders were placed on their surfaces.The samples were then fired at 1 550 ℃ for 3 h with carbon embedded.The interfacial reaction of the three rare earth oxide refractories (La₂Ce₂O₇,La₂Zr₂O₇,and Y₂O₃) with the main rare earth inclusions (La₂O₃,La₂S₃,and LaAlO₃) in molten rare earth steel was studied.The results show that the La₂Ce₂O₇ sample has poor structural stability and readily reacts with La₂S₃,thus leading to cracking.The La₂Zr₂O₇ sample reacts with La₂O₃ and LaAlO₃ weakly,but performs poor La₂S₃ corrosion resistance.The Y₂O₃ sample demonstrates the weakest interaction with the three rare earth inclusions as well as the most stable structure,indicating significant potential as a specialized anti-clogging lining material for rare earth steel.

Key words: rare earth oxides, anti-clogging linings, submerged entry nozzles, interfacial reaction