高温氮气气氛对Al–Al_2O_3耐火材料性能的影响  

Effects of High Temperature on Properties of Al–Al_2O_3 Composites in Nitrogen Atmosphere

作　　者：石昊宁 李勇[1] 秦海霞[1] 高梅[1] 孙加林[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《硅酸盐学报》2016年第3期469-473,共5页Journal of The Chinese Ceramic Society

基　　金：国家科技支撑计划(2013BAE03B01-11)资助

摘　　要：以热固型酚醛树脂为结合剂,制备金属铝质量分数为9%的Al–Al_2O_3复合耐火材料。样品在200℃干燥24 h后,在氮气气氛下分别经1 300、1 500、1 600、1 700和1 800℃保温8 h氮化烧成。结果表明:氮化烧成后,样品中来自酚醛树脂的残碳存在于增强相Al4O4C或Al_2OC中,游离碳含量极低。在1 300℃氮化烧成后,样品中物相为刚玉和Al4O4C;在1 500、1 600和1 700℃氮化烧成后,样品中物相为刚玉、Al_4O_4C和Al_2OC;在1 800℃氮化烧成后,样品中物相为刚玉和Al_2OC。所有温度段均未出现Al4C3。经1 300、1 500和1 600℃氮化烧成后,样品显气孔率在6.0%与8.0%之间,1 600℃氮化烧成样品常温耐压强度达535 MPa,Al_4O_4C及Al_2OC有明显增强作用。A high performance AI-A1203 metal and oxide composite with A1 content of 9% （in mass fraction） was prepared with phenolic resin as a binder. The samples dried for 24 h were heated in nitrogen atmosphere at 1300, 1 500, 1600, 1 700, and 1800℃ for 8 h, respectively. The results show that the residual carbon from the phenolic resin exists in A1404C or AI2OC after nitriding sintering, with little free carbon detected. The phase of the samples heated at 1300℃ are corundum and A1404C; corundum, AhO4C and AI2OC at 1 500-I 700 ℃; and corundum and A12OC at 1 800 ℃. No A14C3appears at various temperatures. The apparent porosity of the sample heated at 1 300, 1 500 and 1 600 ℃ is 6.0%-8.0%. The cold-crushing strength of the sample heated at 1 600℃ is 535 MPa due to the presence of AhO4C or AhOC.

关 键 词：树脂 铝 氧化铝 氮化 增强相 塑性相 

分 类 号：TQ175[化学工程—硅酸盐工业]