Effect of Additive on the Phase Composition and Microstructure of Silica Brick Matrix
The silica matrix specimens were prepared by adding microsilica and MoSi2.The powder mixture was pressed into cylinder and then sintered at 1200 ℃,1250℃,1300℃ and 1400℃ for 8h respectively.The phase compositions of specimens were analyzed by X-ray diffusion,and the tridymite crystal morphology and grain sizes were observed by the SEM.The results show that with the increasing addition of MoSi2 powders,the intensity of tridymite diffraction peaks first increase slightly and then decrease with increasing amount of amorphous phase,while the diffraction peaks of residual quartz phase enhance.When adding 2.5% MoSi2,the precipitation of CaMoO4 phase reduces the O/Si ratio in the liquid phase,and promotes the generation of tridymite,so the amount of tridymite increases,but the crystal size decreases.With the sintering temperature increase,the intensity of tridymite diffraction peaks increase,the residual quartzite amount reduces.
silica brick addition tridymite phase composition microstructure
ZHU Jingjing GU Huazhi CHEN Shufeng PENG Tianxing PENG Nai
The Key State Laboratory Breeding Base of Refractory and Ceramics, Wuhan University of Science and T Jiyuan Refractory Furnace Co., Ltd
国际会议
The 6th International Symposium on Refractories (第六届国际耐火材料会议)
郑州
英文
153-156
2012-10-18（万方平台首次上网日期，不代表论文的发表时间）