粒度组成对Al_2O_3-SiC-C浇注料气孔特性的影响  

Influence of particle size distribution on pore characteristics of Al_2O_3-SiC-C castables

作　　者：尹玉成[1] 梁永和[1] 葛山[1] 曹锟[2] 聂建华[1] 刘志强[1] 

机构地区：[1]武汉科技大学湖北省耐火材料与高温陶瓷重点实验室省部共建国家重点实验室培育基地,湖北武汉430081 [2]武汉钢铁股份有限公司炼钢总厂二分厂,湖北武汉430083

出　　处：《耐火材料》2013年第2期124-127,共4页Refractories

摘　　要：以电熔刚玉(8～5、5～3、3～1、≤1、<0.088 mm)、碳化硅(≤1 mm)、球状沥青(1～0.5 mm)、硅粉(<0.088 mm)、SiO2微粉、Al2O3微粉为原料,铝酸钙水泥为结合剂,通过改变粒度分布系数q(分别为0.21、0.22、0.23、0.24、0.25),制备了不同粒度组成的Al2O3-SiC-C浇注料,并研究了q对110℃24 h烘干和1 450℃3 h埋炭烧后浇注料试样显气孔率、透气度和孔径分布的影响。结果表明:当q由0.21增大到0.25时,烘干和烧后浇注料试样的显气孔率和透气度均先减小后增大,当q=0.23时显气孔率最小,而q=0.22时透气度最小;烘干后试样的平均孔径随q的增大而增大,而烧后试样的平均孔径却没有明显的规律;对于烘干和烧后试样的孔径分布而言,当q为0.21、0.22及0.25时具有明显的离散性,而当q为0.23和0.24特别是q=0.23时,则孔径趋于集中连续分布。Al2O3-SiC-C castables with different particle size distributions were prepared through varying the distribution module q values （0.21,0.22,0.23,0.24, and 0.25） with starting materials of fused corundum （8-5,5-3,3-1,≤1, 〈0.088 mm）,silicon carbide （≤ mm）,spherical pitch （1-0.5 mm）,silicon powder （ 〈0. 088 mm）,silica fume,and alumina micropowder, and binder of calcium aluminate cement. The influ- ences of q values on apparent porosity, permeability, and pore size distribution of castable specimens dried at 110 ℃ for 24 h or carbon embedded fired at 1 450 ℃ for 3 h were researched. The results indicate that for the dried or fired Al2O3-SiC-C castables specimens,as q increases from 0.2：1 to 0.25,the appar- ent porosity and permeability decrease first,and then increase;when q=0.23,the apparent porosity is the minimum,when q=0.22,the permeability is the minimum;the mean pore size of the dried specimens in- creases with q increasing,while for the fired specimens, no obvious regularity is found. Pore size distribu- tion of AI203- SiC-C castable specimens dried or fired is obviously discrete with q =0.21,0.22,and 0.25, while tends to be continuous when q=0.23 and 0.24,especially when q=0.23.

关 键 词：粒度组成 AL2O3-SIC-C浇注料 显气孔率 透气度 孔径分布 

分 类 号：TQ175.71[化学工程—硅酸盐工业]