预烧温度对二步烧结法制备CA_(6)材料的影响  

Influence of prefiring temperature on preparation of CA_(6) materials by two-step sintering

作　　者：金瑶 温天朋 于景坤 袁磊 Jin Yao;Wen Tianpeng;Yu Jingkun;Yuan Lei(School of Metallurgy,Northeastern University,Shenyang 110819,Liaoning,China;不详)

机构地区：[1]东北大学冶金学院,辽宁沈阳110819 [2]东北大学低碳钢铁前沿技术研究院,辽宁沈阳110819

出　　处：《耐火材料》2023年第1期31-34,共4页Refractories

基　　金：国家自然科学基金重点项目(No.51932008);中国博士后科学基金面上项目(2021M700731);中央高校基本科研业务费(N2225048)。

摘　　要：以氧化铝和碳酸钙为原料,采用预烧—破粉碎—压制成型—高温烧成的二步烧结法制备了六铝酸钙(CA_(6))材料,主要研究了预烧温度(分别为1100、1200、1300、1400℃)对CA_(6)材料性能和显微结构的影响。结果表明:1)由于预烧破坏了预烧料中的一部分气孔,并减少了高温烧成过程中的气孔产生量,因此制备的CA_(6)材料的致密度和常温强度远高于常规烧结工艺制备的CA_(6)材料。2)预烧温度以1200℃为最佳,所制备的CA_(6)材料的显气孔率为28.2%,体积密度为2.52 g·cm^(-3),常温耐压强度为330 MPa。CA_(6)materials were prepared by the two-step sintering method using alumina and calcium carbonate as raw materials,prefiring,crushing,press shaping,and high temperature sintering.Effects of prefiring temperatures(1100,1200,1300,and 1400℃)on the properties and the microstructure of CA_(6)materials were mainly studied.The results show that:(1)preheating and crushing damage partial pores in the materials and reduce the pore formation during high temperature sintering,the prepared CA_(6)material performs higher density and cold compressive strength than the CA_(6)material prepared by the conventional sintering process;(2)the optimum prefiring temperature is 1200℃;the prepared CA_(6)material has the apparent porosity of 28.2%,the bulk density of 2.52 g·cm^(-3),and the cold compressive strength of 330 MPa.

关 键 词：六铝酸钙 预烧温度 二步烧结法 致密度 线收缩率 常温耐压强度 

分 类 号：TQ175[化学工程—硅酸盐工业]