摘要
基于珠光砂孔隙多、体积密度低、热导率低的特点,为提高中间包永久性内衬浇注料的保温性能,本文研究了珠光砂添加量对矾土浇注料性能的影响。结果表明,随着珠光砂添加量的增加,烧制浇注料的体积密度减小,显气孔率增加,这与珠光砂本身特性有关,且随着珠光砂添加量的增加,浇注料的加水量增加,烧制时浇注料内部由于水分蒸发形成的原位气孔增加。同时,由于吸水后珠光砂强度降低且珠光砂与浇注料中基质的结合作用较弱,随着珠光砂添加量的增加,浇注料的抗折强度、常温抗压强度降低。综合分析,珠光砂最佳添加量为3%(质量分数)。在400~800℃时,添加3%珠光砂浇注料的导热系数比常规矾土浇注料低30%左右,证明添加珠光砂可显著提高矾土浇注料的保温性能。
Based on the characteristics of pearlescent sand with many pores,low bulk density and low thermal conductivity,the influence of additive amount of pearlescent sand on the performance of bauxite castable was studied to improve the thermal insulation performance of permanent lining castable for tundish.The results show that with the increase of additive amount of pearlescent sand,the bulk density of castable decreases and the apparent porosity increases,which are related to the characteristics of pearlescent sand.Meanwhile,with the increase of the additive amount of pearlescent sand,water added of castable increases,and the in-situ pores formed by water evaporating inside castable increases during firing.Due to the decrease of the strength of pearlescent sand after water absorption and the limited bonding between pearlescent sand and the matrix in the castable,the flexural strength and cold compressive strength of castable decrease with the increase of the additive amount of pearlescent sand.Comprehensive analysis show that the optimum additive amount of pearlescent sand is 3%(mass fraction).The thermal conductivity of 3%pearlescent sand bauxite castable at high temperature of 400~800℃is about 30%,smaller than that of conventional bauxite castable,which proves that the addition of pearlescent sand can significantly improve the thermal insulation performance of bauxite castable.
作者
王宝
谭旭
吕文龙
王怡
周建安
WANG Bao;TAN Xu;LYU Wenlong;WANG Yi;ZHOU Jian’an(School of Materials and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China;The State Key Laboratory Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China)
出处
《硅酸盐通报》
CAS
北大核心
2023年第8期2945-2951,共7页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金区域联合基金(U21A20317)。
关键词
珠光砂
添加量
矾土浇注料
物理性能
力学性能
导热系数
pearlescent sand
additive amount
bauxite castable
physical property
mechanical property
thermal conductivity
