【作者】 戚建强；

【导师】 李楠；

【作者基本信息】 武汉科技大学 ， 材料学， 2004， 硕士

【摘要】 本工作用XRD、SEM、EPMA、DSC-TG及热力学计算等方法对铁水脱硫喷枪用莫来石质浇注料进行了如下三部分的研究：第一部分探讨了莫来石质浇注料的性能以及红柱石引入的影响。第二部分探讨了SiC对莫来石质浇注料性能的影响。第三部分探讨了金属Si对莫来石质浇注料性能的影响。得到的结果如下： 1．红柱石骨料引入到莫来石质浇注料后，试样的热膨胀系数和热膨胀率提高；热处理后试样强度下降，但热震稳定性提高。这是由于红柱石骨料比其周围基质的热膨胀系数大，热处理后基质将承受残余应力进而引发开裂，形成的环状裂纹使强度下降，但可以吸收热震过程中产生的裂纹扩展能而使热震裂纹截止，提高试样的热震稳定性。 2．SiC细粉与SiC微粉的引入对浇注料性能影响相似，即烘后以及800℃烧后强度下降，1400℃烧后强度升高。800℃烧后以及1400℃烧后热震稳定性随着SiC粉料引入量的增加先提高，后下降。对于已经添加了红柱石的试样，随着SiC细粉引入量的增加，烘后以及1100℃烧后强度下降，1400℃烧后强度上升，1100℃烧后热震稳定性提高。 3．金属Si的引入对烘后以及800℃烧后试样强度影响不大，随着金属Si引入量的增加，1400℃烧后强度升高，800℃烧后试样热震稳定性下降，引入金属Si的试样1400℃烧后热震稳定性极差。更多还原

【Abstract】 By means of XRD analysis, SEM, EPMA, DSC-TG and thermodynamic calculation, three parts were studied as follows. In the first part the properties of mullite castable and the effects of andalusite aggregate were investigated. The effects of SiC powder on properties of mullite castable were investigated in the second part. In the third part the effects of Si powder on properties of mullite castable were investigated. The results show that:1. After andalusite aggregates were introduced to mullite castable, coefficient of thermal expansion and ratio of thermal expansion of samples were increasing. At the same time, MOR of samples decrease and thermal shock resistance was improved. The reason is that the cracks formed by differences of thermal expansion coefficient between andalusite aggregates and matrix in castable stop the propagating of cracks formed during thermal shock.2. The effects of SiC powder and SiC micro on properties of mullite castable were similar. MOR of samples dried and soaked at 800 C decrease and that of samples sintered at 1400 C were improved with increasing SiC content. Thermal shock resistance of samples sintered at 800 C and 1400 C were improved at first then decrease with increasing SiC content. For the castable with andalusite, MOR of samples dried and soaked at 800 C decreases and that of samples sintered at 1400 C was improved with increasing SiC content, and thermal shock resistance was improved with increasing SiC content.3 MOR of samples dried and soaked at 800 C change little and that of samples sintered at 1400 C was improved with increasing Si content. Thermal shock resistance of samples soaked at 800 C decreases with increasing Si content and that of samples sintered at 1400 C was very bad.更多还原