从热力学计算分析气氛对高铬耐火材料烧结的影响  

EFFECT OF ATMOSPHERE ON SINTERING OF HIGH Cr_2O_3 BEARING REFRACTORIES CONSIDERED FROM THE THERMODYNAMIC CALCULATION

作　　者：钱跃进[1,2] 蒋明学[1] 李柳生[2] 

机构地区：[1]西安建筑科技大学材料科学与工程学院,西安710005 [2]洛阳理工学院材料科学与工程系,河南洛阳471023

出　　处：《硅酸盐学报》2009年第9期1526-1530,共5页Journal of The Chinese Ceramic Society

摘　　要：纯Cr2O3和含Cr2O3高的高铬耐火材料在氧化气氛中是非常难烧结的材料,在埋碳条件下较易烧结致密。关于埋碳条件下该材料易烧结致密的原因,有观点认为是生成液态CrO产生的液相烧结,根据热力学分析,在埋碳维持的还原气氛中,在1550℃,CO还原Cr2O3的生成物是铬的碳化物而不是液态CrO,并在Cr2O3的还原气氛烧结实验中得到证实。在热力学分析和实验的基础上,进一步分析了烧成气氛对高铬耐火材料烧结的影响,提出了促进其烧结的措施。Refractories of pure Cr2O3 or high Cr2O3 bearing refractories are difficult to sinter in oxidizing atmosphere,but they can be sintered easily under carbon-embedded conditions. In the latter case it is believed to be due to the formation of liquid CrO under the reducing atmosphere. The thermodynamic calculation shows that the Cr2O3 is reduced by CO at 1 550 ℃ to chromium carbides,which disproves the existence of liquid CrO. This is confirmed by further sintering experiment of the Cr2O3 refractory. The effect of the atmosphere on the sintering of high Cr2O3 bearing refractories and the measures for enhancing the sintering process are discussed according to the experiment and the thermodynamic calculation.

关 键 词：高铬耐火材料 烧结 热力学计算 还原气氛 

分 类 号：TQ171[化学工程—玻璃工业]