关键词: 刚玉-CA₆浇注料, 聚丙烯纤维, 抗热震性, 平均线膨胀系数, 弹性模量

Abstract: To enhance the properties of corundum-calcium hexaaluminate (CA₆) castables,hydrous alumina bonded corundum-CA₆ castables were prepared using corundum,CA₆ and activated α-Al₂O₃ micropowder as main raw materials.The effects of different polypropylene fiber extra-additions (mass fractions of 0,0.04%,0.08%,0.12% and 0.16%) on the properties of the castables were studied,especially on the thermal shock resistance.The results show that:(1)the polypropylene fiber addition can reduce the average linear thermal expansion coefficient while decrease the strength and bulk density of the specimens,which leads to a decrease in the elastic modulus;(2)an appropriate addition of polypropylene fibers can improve the thermal shock resistance of the specimens,but excessive polypropylene fibers loosen the internal structure of the material and decrease the density,thereby worsening the thermal shock resistance of the specimens;(3)when the polypropylene fiber addition is 0.08%,the specimen has the highest retention ratio of modulus of rupture of 53.5%,showing the best thermal shock resistance.

Key words: corundum-CA₆ castables, polypropylene fibers, average linear thermal expansion coefficient, thermal expansion coefficient, elastic modulus