养护湿度对铝酸钙水泥结合刚玉质浇注料性能的影响  

Effect of curing humidity on properties of calcium aluminate cement bonded corundum castables

作　　者：李烨 陆昕昱 廖桂华[1] 丁达飞 王青峰[1] 张举 叶国田[2] Li Ye;Lu Xinyu;Liao Guihua;Ding Dafei;Wang Qingfeng;Zhang Ju;Ye Guotian(School of Materials Science and Engineering,Luoyang Institute of Science and Technology,Luoyang 471023,Henan,China)

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 [2]郑州大学材料科学与工程学院,河南郑州450001 [3]中国中化集团有限公司创新与战略发展部,北京100031

出　　处：《耐火材料》2021年第6期466-470,共5页Refractories

基　　金：国家自然科学基金资助项目(51672255);武汉科技大学耐火材料与冶金重点实验室开放基金(G201604,G201403)。

摘　　要：以板状刚玉、α-Al_(2)O_(3)微粉和铝酸钙水泥为原料制备刚玉质浇注料试样。将试样于25℃分别在不同的湿度养护3 d,再在110℃烘干24 h后分别于800、1100、1450和1620℃保温3 h进行热处理,研究了养护湿度(40%、70%和100%)对其性能、物相组成、显微结构的影响。结果表明:随着养护湿度的降低,浇注料的脱模强度、烘干强度及中高温热处理后的常温抗折强度增大,而显气孔率及热震后的抗折强度保持率逐渐降低。另外,随着养护湿度降低,铝酸钙水泥的水化程度更高,1620℃热处理后浇注料的骨料与基质结合更加紧密。Corundum based castables were prepared using tabular corundum,α-Al_(2)O_(3) micropowder and calcium aluminate cement as starting materials,curing at 25℃in different humidities for 3 d,drying at 110℃for 24 h,and firing at 800,1100,1450 and 1620℃for 3 h,respectively.The effects of the curing humidity(40%,70%,and 100%)on the properties,the phase composition and the microstructure of the castables were researched.The results show that,as the curing humidity decreases,the demolding strength,the drying strength and the cold modulus of rupture of the samples increase while the apparent porosity and the MOR retention ratio decrease.Moreover,with the reduction of the curing humidity,the hydration degree of the calcium aluminate cement is enhanced,and the aggregates and the matrix are bonded more closely for the castable fired at 1620℃.

关 键 词：养护湿度 铝酸钙水泥 刚玉质浇注料 强度 

分 类 号：TQ175[化学工程—硅酸盐工业]