固含量对发泡法-凝胶注模制备六铝酸钙轻质材料性能和显微结构的影响  

Influence of solid loading on properties and microstructure of lightweight calcium hexaluminate materials prepared by foaming-gel casting

作　　者：曹易敏 魏耀武[1] 孙华云[2] 周辉 Cao Yimin;Wei Yaowu;Sun Huayun;Zhou Hui(The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China;不详)

机构地区：[1]武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北武汉430081 [2]山东工业职业学院,山东淄博256414 [3]武汉钢铁集团耐火材料有限责任公司,湖北武汉430082

出　　处：《耐火材料》2022年第4期329-333,共5页Refractories

摘　　要：为研究浆体固含量对六铝酸钙轻质材料性能的影响,以d_(50)=1.9μm的α-Al_(2)O_(3)和d_(50)=4.3μm的Ca(OH)_(2)为原料,通过发泡法-凝胶注模工艺制备六铝酸钙轻质材料,研究了浆体中固含量(φ,分别为50%、52.5%、55%、57.5%、60%)对烧后试样物相组成、显微结构和性能的影响。结果表明:通过发泡法-凝胶注模工艺制备的试样在高温处理后,试样中片状六铝酸钙晶体相互交织形成大量孔径小于5μm的微孔,此类微孔占总气孔数量的50%以上。在本研究中,当浆体中固含量为57.5%(φ)时,六铝酸钙轻质材料性能最佳,其常温耐压强度达9.4 MPa。To study the effect of the slurry solid loading on their properties,lightweight calcium hexaluminate materials were prepared using active alumina(d_(50)=1.9μm)and calcium hydroxide(d_(50)=4.3μm)as starting materials by foaming-gel casting.The effects of the solid loading in the slurry(50%,52.5%,55%,57.5%and 60%,by volume,respectively)on the phase composition,the microstructure and the properties of the fired samples were studied.The results show that after high temperature treatment,flake calcium hexaluminate crystals in the samples prepared by foaming-gel casting are interwoven to form a large number of micropores smaller than 5μm,accounting for more than 50%of total pores.In this study,with the solid loading of 57.5%,the sample has the best properties,performing the cold compressive strength of 9.4 MPa.

关 键 词：六铝酸钙 固含量 显微结构 耐压强度 

分 类 号：TQ175[化学工程—硅酸盐工业]