【摘要】 以中档镁砂和电熔镁砂为主要原料,采用偏硅酸盐取代酚醛树脂为结合剂,并引入一定量的中温和低温增强剂,重点研究了结合剂的选择、颗粒级配的优化及外加物的引入等因素对中间包碱性无碳干式振动料性能的影响,并探讨偏硅酸盐结合碱性无碳干式振动料的结合机理。研究结果表明,采用偏硅酸盐作结合剂时,干式振动料可达到较大的强度;颗粒级配以q=0.48,临界粒度为5或3 mm,细粉量为10%～20%(w)为宜;引入一定数量的外加物与偏硅酸盐"熔融"复合,可以明显提高中间包干式振动料的强度,且抗侵蚀性能优良;随着温度升高,偏硅酸盐结合干式振动料的结合方式按粘着结合→化学结合→陶瓷结合转变。更多还原

【Abstract】 The carbon-free basic dry vibration refractories were prepared using middle grade and fused magnesia as main starting materials,metasilicate replacing phenolic resin as binder,adding certain amount of middle and low temperature intensifiers.Effects of binder,grain size composition and additives on basic dry vibration refractories for tundish were studied,and the bonding mechanism was also analyzed.The results showed that when using meta-silicate as binder,the higher strength could be acquired and the suitable grain size composition was q=0.48,the critical granularity was 5 or 3 mm,the amount of fine was 10%-20%(mass percent).The strength and corrosion resistance of the basic dry vibration refractories could be improved by adding some additives.With temperature rising,the bonding type in dry vibration refractories changed from cohere bonding to reaction bonding and ceramic bonding at last.更多还原