硅铝凝胶粉结合SiAlON增强A1_2O_3-SiC-C浇注料  

Effect of silica-alumina colloid powder on properties of SiAlON-reinforced Al_2O_3-SiC-C castables

作　　者：吕春燕[1] 汪厚植[2] 顾华志[2] 夏平[1] 张文杰[2] 

机构地区：[1]湖州师范学院生命科学学院,湖州313000 [2]武汉科技大学高温陶瓷与耐火材料国家重点实验室培育基地

出　　处：《耐火材料》2005年第3期188-191,共4页Refractories

摘　　要：以电熔致密刚玉和碳化硅为骨料,硅铝凝胶粉、氮化硅粉、硅粉为细粉,制成SiAlON增强Al2O3-SiC-C浇注料,研究了硅铝凝胶粉的加入量分别为1%、3%、5%(质量分数,下同)时对此浇注料的烧结性能、力学性能的影响。结果表明:采用硅铝凝胶粉取代纯铝酸钙水泥作结合剂,可使SiAlON增强Al2O3-SiC-C浇注料在经中温、高温热处理后的常温抗折强度及耐压强度较大提高,中温、高温强度提高幅度更大。另外,随着硅铝凝胶粉加入量的增加,浇注料的常温及高温强度呈先增大而后减小的趋势。由X射线衍射和扫描电镜分析结果可知,硅铝凝胶粉的加入既有利于降低βSiAlON的生成温度,又可以减少材料中的低熔物质。分布均匀、发育良好的粒状βSiAlON的形成是SiAlON增强Al2O3-SiC-C浇注料较水泥结合浇注料强度高的根本原因。The SiAlON-reinforced A1_2O_3-SiC-C castables were prepared with fused dense corundum (mass ratio 70%) and SiC (10%) as aggregates,silica-alumina colloid powder(1%~5%),SiC powder(5%~10%) and microsilica (5%~10% )as matrix.The effects of additions of silica-alumina colloid powder (1%,3% and 5% respectively) on sintering and mechanical properties of the Al_2O_3-SiC-C materials were studied.The results show that:(1) Replacing calcium aluminate cement with silica-alumina colloid powder as binder,the cold MOR and crushing strength of the castables after treated at 1000 ℃ for 3 h and 1450 ℃ for 3 h respectively increase apparently,especially the hot MOR(1400 ℃ 0.5 h);(2)The cold and hot strength of the castables initially increase and then begin to decrease with the increase of colloid powder addition;3 Based on the XRD,SEM and TEM analysis,it is concluded that the addition of nano-sized colloid powder as binder is beneficial to decreasing the forming temperature of β-SiAlON and reducing the quantity of low melting-point materials.The pre-formation of β-SiAlON which is evenly distributed and its further growth at higher temperature is proved to be the essential reason that the castables have higher strength than that of cement-bonded ones.

关 键 词：AL2O3-SIC-C SIALON 浇注料 凝胶粉 纯铝酸钙水泥 高温强度 高温热处理 X射线衍射 氮化硅粉 质量分数 烧结性能 力学性能 耐压强度 抗折强度 分析结果 扫描电镜 生成温度 加入量 碳化硅 结合剂 中温 常温 刚玉 致密 电熔 

分 类 号：TQ175.732[化学工程—硅酸盐工业] TQ174.758