Sialon结合刚玉材料凝胶注模成型及其性能  

Properties of Sialon Bonded Corundum Refractories by Gelcasting

作　　者：巩甘雷[1] 唐骥[1] 茹红强[1] 孙旭东[1] 

机构地区：[1]东北大学材料与冶金学院

出　　处：《铸造》2004年第12期992-996,共5页Foundry

基　　金：国家"863"资助项目(2002AA33408);河北省科学研究计划(98212210D)

摘　　要：研究了Sialon结合刚玉耐火材料浓悬浮体的流变性能和稳定性能。固相体积分数79%的悬浮体,在中等剪切速率时表现剪切变稀特征,剪切速率10～100s 1范围表现出突出的"切稀"行为,符合凝胶注模成型的要求。计算了在剪切速率10～20s 1范围内的Bingham值为22960Pa,建立的流变模型为:σ=22960+391γ。凝胶注模成型后的坯体具有3 11g/cm3的体积密度和14MPa的抗折强度。烧结材料的物相组成为刚玉和Sialon,六方柱状Sialon晶体发育完整,具有均匀一致的显微结构,性能达到了使用机械成型产品的性能,高温抗折强度提高3 8倍。Rheological behavior and stability of their suspensions of Sialon bonded corundum refractories were investigated, Suspensions with 79vol% exhibit shear-thinning characteristic, especially in 10～100s^(-1), and satisfy gelcasting. Meanwhile it is calculated that Bingham value is 22960Pa in 10～20s^(-1), rheological model as follows:σ=22960+391γ. By gelcasting, Bulk density of green bodies was 3.11g/cm^3, flexural strength is 14MPa. The phases present in the materials is corundum and Sialon, hexagonal dendritic Sialon phase grow perfectly in uniform microstructure, the physical property is as same as that producted by machine, and flexural strength at high temperture increase 3.8 times as that by machine.

关 键 词：Sialon结合刚玉耐火材料 凝胶注模成型 流变性 抗折强度 显微结构 

分 类 号：TQ174.758[化学工程—陶瓷工业]