尖晶石组成和含量对RH浸渍管用方镁石-尖晶石质耐火材料性能的影响  

Effect of spinel content and composition on properties of periclase-spinel refractories used in RH snorkels

作　　者：李静捷 赵惠忠[1] 王立锋[1] 崔江涛 慕松林 吕永峰 

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]郑州汇特耐火材料有限公司,河南郑州452370

出　　处：《耐火材料》2016年第3期189-194,共6页Refractories

基　　金：武汉科技大学研究生创新基金重点项目(JCX0001)

摘　　要：为了研究不同尖晶石组成和含量对RH浸渍管用方镁石-尖晶石质耐火材料性能的影响,以高纯烧结镁砂、电熔镁砂、三种预合成烧结镁铝尖晶石(Al2O3的质量分数分别为50%、66%和78%)为原料制备了方镁石-尖晶石耐火材料试样。研究表明:1)加入尖晶石会降低试样的力学性能和热膨胀系数,但可显著提高试样的抗热震性;2)由于原位生成尖晶石的影响,当加入富铝尖晶石时试样的力学性能和热膨胀系数下降,抗热震性提高;3)加入的尖晶石种类和含量不同,试样的断裂机制有所不同,随着尖晶石加入量的增加以及由富镁尖晶石转变为富铝尖晶石,试样由穿晶断裂转变为沿晶断裂。综合考虑,选择富镁尖晶石且尖晶石加入量(w)为16%~18%时,试样的综合性能较优。In order to study the effect of spinel content and composition on properties of periclase-spinel re-fractories used in RH snorkels,high purity sintered magnesia,fused magnesia and three kinds of pre-syn-thesized magnesium aluminate spinel (alumina content of 50%,66%,and 78% by mass,respectively) were used as starting materials to prepare periclase-spinel specimens.Results reveal that:(1)adding spi-nel reduces strengths and CTEs,while increases resistance to thermal shock significantly;(2)due to the formation of in-situ spinel while sintering,adding alumina-rich spinel leads to decreases in strengths and CTEs but improvement in thermal shock resistance;(3)the fracture mechanism differs from transgranular fracture to intergranular fracture as spinel addition rising and the change from magnesia-rich spinel to the alumina-rich spinel.In conclusion,a better comprehensive properties can be reached with 16%-18% ad-dition of magnesia-rich spinel.

关 键 词：RH浸渍管 方镁石-尖晶石 富镁尖晶石 富铝尖晶石 

分 类 号：TQ175.1[化学工程—硅酸盐工业]