关键词: 硅溶胶, 硅酸铝陶瓷纤维, 整体式铸嘴, 迁移层厚度, 抗折强度

Abstract:

Nozzle plate samples for aluminum strip continuous casting and rolling were prepared using aluminum silicate ceramic fiber,kaolin and aluminum tripolyphosphate as main raw materials,silica sol or silica sol-epoxy resin as the bonding system,pulping,casting,curing at different temperatures (25,30,35,40,45,50 and 60 ℃) for different durations (40,60,90 and 120 min),drying at 120 ℃ and heat-treating at 800 ℃.The migration thickness of silica sol and the cold modulus of rupture were measured,and the microstructure was analyzed.The results show that:1)with the same curing temperature,the thickness of the silica sol migration layer of the samples with the different combination systems decreases with the increase of the curing time;with the same curing duration,it basically decreases first and then increases with the increase of the curing temperature;the optimal curing condition is at 40 ℃ for 120 min;2)the silica sol-epoxy composited bonded samples have thinner silica sol migration layers and lower cold modulus of rupture than the silica sol self-curing bonded samples;3)the silica sol-epoxy resin complicated bonded system has better machinability but slightly lower mechanical strength than the silica sol self-gel system.

Key words: silica sol, aluminum silicate ceramic fiber, integral casting nozzle, thickness of migration layer, modulus of rupture