Properties of silica sol-phenolic resin co-bonded Al2O3-SiC-C bricks
To mitigate the structural deterioration of Al2O3-SiC-C bricks induced by phenolic resin carboni-zation and enhance their mechanical properties and slag resistance,silica sol-phenolic resin co-bonded Al2O3-SiC-C bricks were prepared using bauxite(5-3,3-1 and ≤1 mm)as aggregates,white fused co-rundum(≤0.045 mm),SiC(≤0.075 mm),α-Al2O3 micropowder and flake graphite(≤0.15 mm)as the matrix,and thermosetting phenolic resin and silica sol as the binders.Based on the extra addition of 4.5 mass％phenolic resin,the effects of the silica sol extra addition(mass fractions of 0,0.45％,0.90％and 1.35％,respectively)on the cold and hot mechanical properties and slag resistance of the bricks were investigated.The results show that an appropriate addition of silica sol can effectively improve the mechani-cal properties and slag resistance of the Al2O3-SiC-C bricks,and the specimen with 0.45％silica sol per-forms excellent cold and hot mechanical properties and slag resistance.
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