红柱石基材料中添加SiC颗粒的作用  

Effect of Si C Particle Added on Andalusite Based Refractories

作　　者：李柳生[1] 廖桂华[1] 徐国辉[1] 王青峰[1] 

机构地区：[1]洛阳理工学院材料科学与工程学院,河南洛阳471023

出　　处：《非金属矿》2015年第6期42-44,共3页Non-Metallic Mines

摘　　要：在以高纯红柱石和活性氧化铝细粉为主要原料配制的试样中,分别以0%、3%、6%、9%、12%的碳化硅颗粒（1~0.5 mm）取代红柱石中颗粒,试样经1500℃、3 h烧成后,检测其体积密度、显气孔率、常温耐压强度和蠕变率等。结果表明,碳化硅的加入促进了红柱石的分解转化、原生莫来石化反应和二次莫来石化反应,加入适量有助于改善材料的显微结构,提高材料的强度和抗蠕变性能。添加过量的碳化硅时,其氧化后生成的大量玻璃相使材料显微结构劣化,导致强度和抗蠕变性能下降。添加碳化硅颗粒的试样力学性能优于添加碳化硅细粉的试样。Si C颗粒（1~0.5 mm）在红柱石基耐火材料中的加入量以6%为宜。For the andalusite based refractory specimens composed of high-purity andalusite and active alumina fine powder, 0%~12% of Si C particles（1~0.5 mm） were added in them at intervals of 3% substituting for the high-purity andalusite with middle particle size, respectively. After the specimens were fired at 1500 ℃ for 3 h and cooled to room temperature, their density, apparent porosity, crush strength and creep were determined. It is shown that the addition of Si C promotes decomposition of andalusite, primary and secondary mullitization. Appropriate addition of Si C improves microstructure, strength and creep resistance of the andalusite based refractory specimens. Excess Si C addition will worsen microstructure of the specimens due to large amount of glass phase produced by Si C oxidized, leading to decrease of strength and creep resistance of the specimens. The mechanical properties of andalusite based refractory specimens added with Si C particle（1~0.5 mm） are better than that of one added with Si C powder. The optimum adding amount of Si C particle is 6%.

关 键 词：红柱石 活性氧化铝 莫来石化 碳化硅 耐火材料 物理性质 影响 

分 类 号：TQ175.712.2[化学工程—硅酸盐工业]