骨料种类对铁水包用Al_(2) O_(3)-SiC-C砖性能的影响

Effect of aggregate types on properties of Al_(2)O_(3)-SiC-C bricks for iron ladles

骨料作为耐火材料的重要组成部分,决定着材料的各项性能。分别以粒度均为5~3、3~1和≤1 mm的高铝矾土、电熔棕刚玉、板状刚玉为骨料,以电熔白刚玉(≤0.045 mm)、SiC(≤0.075 mm)、活性α-Al_(2)O_(3)微粉(≤0.045 mm)和鳞片石墨(≤0.15 mm)等为基质,以热固性酚醛树脂为结合剂制备了Al_(2)O_(3)-SiC-C砖,研究了骨料种类(高铝矾土、电熔棕刚玉、板状刚玉)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:以板状刚玉为骨料时,由于其较高的致密度和较低的杂质含量,使得Al_(2)O_(3)-SiC-C砖具有最优的高温力学性能和抗渣性能;以高铝矾土为骨料时,由于其较高的气孔率和杂质含量,导致试样高温力学性能和抗渣性最差。

As an important part of refractory materials,aggregates determine the properties of materials.Al_(2)O_(3)-SiC-C bricks were prepared using bauxite,brown fused corundum or tabular corundum with particle sizes of 5-3,3-1 and≤1 mm as aggregates,white fused corundum(≤0.045 mm),SiC(≤0.075 mm),activeα-Al_(2)O_(3) powder(≤0.045 mm)and flake graphite(≤0.15 mm)as matrix,and thermosetting phenolic resin as the binder.The effects of the three aggregates on the cold and hot mechanical properties as well as the slag resistance of Al_(2)O_(3)-SiC-C brick were studied.The results show that the Al_(2)O_(3)-SiC-C bricks has the best hot mechanical properties and slag resistance when using tabular corundum as aggregates due to its higher density and lower impurity phase contents;and when bauxite is used as aggregates,the hot mechanical properties and slag resistance of the brick are worst due to the high porosity and impurity contents of bauxite.