造粒石墨加入量对Al_2O_3-SiC-C质浇注料性能的影响

Effect of pelletized graphite addition on properties of Al_2O_3-SiC-C castables

以粒度为8～5、5～3、3～1mm的电熔棕刚玉，粒度为≤1、0．045mm的电熔致密刚玉，以及粒度为≤1、0．064mm的SiC为主要原料，按骨料与基质料的质量比为71：29，复合加入2％（W）的硅粉和0．4％（w）的B4C为抗氧化剂，以w（C）=35％的造粒石墨为碳源，并改变其加入量，制备了w（c）=0、2％、4％和6％的Al2O3-SiC—C质浇注料。研究造粒石墨加入量对浇注料物理性能、抗氧化性、抗渣性和抗热震性的影响。结果表明：随着造粒石墨加入量的增加，浇注料加水量增加，体积密度和强度降低，抗热震性提高；w（C）=4％时浇注料的抗氧化性最好；造粒石墨加入量的增加有助于提高浇注料的抗渣渗透性，抗侵蚀性也有所改善。

AI2Q-SiC-C castables with carbon content of 0,2% ,4% and 6% （in mass,the same hereinafter） were prepared using brown fused corundum （8-5,.5-3 and 3-1 mm）,dense fused corundum （≤1 and 0.045 mm） and SiC （≤1 and ≤0. 064 mm） as main starting materials with mass ratio of aggregate： matrix =71：29,2% silicon powder and 0.4% B4C as antioxidant, and pelletized graphite with 35% carbon as carbon source. Effects of pelletized graphite addition on physical properties, oxidation resistance, slag resistance and thermal shock resistance of Al2O3-SiC-C castables were researched. The results show that,with the increase of pelletized graphite addition,the required water amount of castable increases,the bulk density and strength reduce, the thermal shock resistance increases; with 4% carbon,the castable performs the best oxidation resistance;the increase of pelletized graphite is beneficial to the improvement of slag penetration resistance and corrosion resistance.