硅溶胶-酚醛树脂共结合Al_(2)O_(3)-SiC-C砖性能研究

Properties of silica sol-phenolic resin co-bonded Al_(2)O_(3)-SiC-C bricks

为了缓解酚醛树脂碳化引起的Al_(2)O_(3)-SiC-C砖组织结构劣化,提升Al_(2)O_(3)-SiC-C砖的力学性能和抗渣性能,以粒度分别为5~3、3~1和≤1 mm的高铝矾土为骨料,以电熔白刚玉(≤0.045 mm)、SiC(≤0.075 mm)、α-Al_(2)O_(3)微粉和鳞片石墨(≤0.15 mm)等为基质,以热固性酚醛树脂和硅溶胶为结合剂,制备了硅溶胶-酚醛树脂共结合Al_(2)O_(3)-SiC-C砖。在酚醛树脂外加量为4.5%(w)的基础上,探究了硅溶胶的加入量(外加质量分数分别为0、0.45%、0.90%和1.35%)对Al_(2)O_(3)-SiC-C砖常温力学性能、高温力学性能和抗渣性能的影响。结果表明:引入适量硅溶胶可以有效提升Al_(2)O_(3)-SiC-C砖的力学性能及抗渣性能,当硅溶胶加入量为0.45%(w)时,试样具有优异的常温、高温力学性能及抗渣性能。

To mitigate the structural deterioration of Al_(2)O_(3)-SiC-C bricks induced by phenolic resin carbonization and enhance their mechanical properties and slag resistance,silica sol-phenolic resin co-bonded Al_(2)O_(3)-SiC-C bricks were prepared using bauxite(5-3,3-1 and≤1 mm)as aggregates,white fused corundum(≤0.045 mm),SiC(≤0.075 mm),α-Al_(2)O_(3)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 mechanical properties and slag resistance of the Al_(2)O_(3)-SiC-C bricks,and the specimen with 0.45%silica sol performs excellent cold and hot mechanical properties and slag resistance.