Cr2O3微粉加入量对Al_(2)O_(3)-Cr2O3质耐火材料性能的影响  

Effect of Addition of CrO Micropowder on Properties of Al_(2)O_(3)-CrO Refractory

作　　者：康鑫 张利新 邓俊杰 刘萍 徐恩霞 李素平 KANG Xin;ZHANG Lixin;DENG Junjie;LIU Ping;XU Enxia;LI Suping(Henan Key Laboratory of High Temperature Functional Ceramics,School of Material Science and Engineering,Zhengzhou University,Zhengzhou 450052,China;Sinosteel Luonai Materials Technology Corporation,Luoyang 471039,China)

机构地区：[1]郑州大学材料科学与工程学院,河南省高温功能材料重点实验室,郑州450052 [2]中钢洛耐科技股份有限公司,洛阳471039

出　　处：《硅酸盐通报》2021年第10期3285-3291,共7页Bulletin of the Chinese Ceramic Society

摘　　要：以电熔铬刚玉和白刚玉为主要原料,用Cr2O3微粉部分替代电熔铬刚玉细粉,研究了Cr2O3微粉加入量对Al_(2)O_(3)-Cr2O3质耐火材料常温和高温性能、物相组成和显微结构的影响。结果表明,随着Cr2O3微粉加入量的增加,原位形成了(Al1-xCrx)2O3固溶体,促进了烧结,材料的显气孔率先降低后升高,且(Al1-xCrx)2O3固溶体的晶格常数呈线性增加,符合Vegard定律。材料的常温抗折强度和常温耐压强度随Cr2O3微粉加入量的增加先升高后降低,在Cr2O3微粉加入量为15%(质量分数)时强度达到最大值。而当Cr2O3微粉加入量为20%(质量分数)时,由于有挥发现象,材料显气孔率上升,强度下降。材料高温抗折强度随Cr2O3微粉加入量的增加而增加,材料的残余强度保持率呈先降低后升高的趋势。The effect of the addition of Cr2O3 micropowder on the normal temperature and high temperature performances, phase composition and microstructure of Al_(2)O_(3)-Cr2O3 refractories was studied by using fused chromium corundum and white corundum as the main raw materials, and using Cr2O3 micropowder to partially replace the fused chromium corundum fine powder. The results show that with the increase of the addition of Cr2O3 micropowder,(Al1-xCrx)2O3 solid solution is in-situ formed, which promotes sintering. And the apparent porosity of the material decreases first and then increases. The lattice constant of(Al1-xCrx)2O3 solid solution increases linearly with the increase of the addition of Cr2O3 micropowder, which conforms to Vegard’s law. The cold modulus of rupture and cold compressive strength increase first and then decrease with the increase of the addition of Cr2O3 micropowder. When the addition of Cr2O3 micropowder is 15%(mass fraction), the strength of the material reaches the maximum value. When the addition of Cr2O3 micropowder is 20%(mass fraction), the apparent porosity of the material increases and the strength decreases due to volatilization. The hot modulus of rupture of the material increases, and the residual strength rate of the material decreases first and then increases with the increase of the addition of Cr2O3 micropowder.

关 键 词：Al_(2)O_(3)-Cr2O3质耐火材料 Cr2O3微粉 (Al1-xCrx)2O3固溶体 晶格常数 Vegard定律 高温性能 

分 类 号：TQ175.71[化学工程—硅酸盐工业]