锆英石对电熔镁橄榄石制品性能的影响

摘要

The fused forsterite products were prepared by using fused forsterite (5-3,3-1,≤ 1,and ≤0.088 mm),fused magnesia powder(≤0.075 mm) as starting materials,and adding zircon and microsilica.Effects of zircon additions(1％,2％,3％ and 4％ in mass) on cold physical properties,thermal shock resistance and phase composition of fused forsterite products were investigated.The results show that with the increase of zircon addition,(1) cold modulus of rupture,crushing strength,and density increase,apparent porosity and change in dimensions on heating decrease for the specimen fired at 1 550 ℃ for 3 h;(2)the strongest diffraction peak of m-ZrO2 becomes stronger and stronger;and the diffraction peaks of m-ZrO2 are most obvious when zircon addition is 4％ ;(3)thermal shock resistance first enhances and then declines,and the optimum addition is 1％-3％.%以电熔镁橄榄石(5～3、3～1、≤1、≤0.088 mm)和电熔镁砂细粉(≤0.075 mm)为主要原料,添加锆英石和二氧化硅微粉来制备电熔镁橄榄石制品.研究了锆英石加入量(w)分别为1％、2％、3％、4％时对电熔镁橄榄石制品常温物理性能、抗热震性和物相组成的影响.结果表明:1)随着锆英石含量的增加,1 550℃3 h热处理后试样的常温抗折强度和耐压强度呈现增加的趋势,致密度增加,显气孔率降低,试样烧后的线变化率呈现降低的趋势；2)随着锆英石含量的增加,m-ZrO2的最强衍射峰峰值越来越强,锆英石加入量为4％(w)时,m-ZrO2的衍射峰最明显；3)随着锆英石加入量的增加,试样的抗热震性先提高后降低,适宜的加入量(w)为1％～3％.