Al2O3-SiC复相粉对Al2O3-SiC-C材料性能的影响  

Effect of Al_2O_3-SiC composite powder on properties of Al_2O_3-SiC-C bricks

作　　者：王长春[1,2] 叶方保[1] 陈花朵 叶晓舟[3] 

机构地区：[1]郑州大学河南省高温功能材料重点实验室,河南郑州450052 [2]河南省伯马(集团)股份有限公司,河南新乡453000 [3]南京钢铁集团有限公司电炉厂,江苏南京210035

出　　处：《耐火材料》2013年第4期254-258,共5页Refractories

基　　金：国家自然科学基金重点项目(51032007)资助

摘　　要：以电熔白刚玉(3～1、≤1、≤0.044 mm)、Al2O3-SiC复相粉(d50≤5μm)、α-Al2O3微粉(d50=1.2μm)、SiC粉(≤0.044 mm)、鳞片石墨(≤0.088 mm)、Si粉(d50=42.8μm)和B4C(d50≤10μm)为主要原料,热固酚醛树脂为结合剂,研究了分别用4%、8%、12%、16%质量分数的Al2O3-SiC复相粉等比例取代α-Al2O3微粉和SiC细粉对Al2O3-SiC-C试样在180℃固化后和1 000、1 500℃埋焦炭热处理后的显气孔率、体积密度、常温抗折强度、常温耐压强度、高温抗折强度(1 400℃)、抗热震性(1 100℃,水冷)以及抗氧化性(1 000、1 500℃)的影响。结果表明:随Al2O3-SiC复相粉加入量的增加,试样经180℃固化后常温性能下降,1 000℃热处理后常温性能变化不大,1 500℃热处理后除耐压强度显著提高外,其余各项常温性能变化不大;而高温抗折强度下降,抗热震性明显提高,试样经1 500℃氧化后的抗氧化性以加入4%质量分数复相粉的最佳。其原因可能是由于该复相粉的粒度更细,反应活性更高,其氧化层中更易生成莫来石,形成表面致密层从而有效地阻碍氧气向材料内部扩散。Al2O3-SiC-C specimens were prepared using white fused corundum （3-1, ≤1 and ≤0. 044 mm） ,Al2O3 - SiC composite powders （ d50 ≤ 5μm）, α-Al2O3 micropowder （ d50 = 1. 2μm）, SiC powder （ ≤0. 044 mm） ,flake graphite（ ≤0. 088 mm） ,Si powder（ d50 =42.8μm） and B4C powder（ also ≤10μm） as main starting materials, and thermosetting phenolic resin as binder. 4% ,8%, 12% and 16% （in mass,the same hereinafter） Al2O3-SiC composite powder substituted the same quantity of α-Al2O3 micropowder and SiC powder. Effects of composite powder additions on apparent porosity, bulk density, cold modulus of rupture,cold crushing strength,hot modulus of rupture （1 400 ℃）,thermal shock resistance （1100 ℃,water quenching） and oxidation resistance （1 000 and 1500 ℃） of Al2O3-SiC-C specimens after 180 ℃ curing, 1000 ℃ 3 h carbon-embedded firing and 1 500 ℃ 3 h carbon-embedded firing, respectively,were researched. The results indicate that： （1）with the increase of Al2O3-SiC composite powder, cold properties of the cured specimens decline,those of the specimens fired at 1 000 ℃ change a little,and those of the specimens fired at 1500 ℃ change a little except for an obvious improvement of cold crushing strength; （2） with the increase of Al2O3-SiC composite powder, hot modulus of rupture decreases and thermal shock resistance enhances significantly; （3） when Al2O3-SiC composite powder addition is 4%, the oxidation resistance at 1 500 ℃ is the best, and the reason may be the composite powder is finer and more active, which is beneficial to form dense mullite protective layer to retard the O2 diffusion into the specimens.

关 键 词：Al2O3-SiC复相粉 Al2O3-SiC—C砖 抗热震性 抗氧化性 

分 类 号：TQ175[化学工程—硅酸盐工业]