Phase and Microstructure Evolution of Mullite Synthesized from Coal Gangue and γ-Al2O3
Mullite with puncheon-like grains was synthesized by sintering the mixtures of coal gangue and γ-Al2O3 at 1400 ℃~1550 ℃ for 4h.The phase and microstructure evolution of the mullitization behavior were investigated by XRD,SEM and EDS.Phases of the sintered specimens were mullite,corundum and cristobalite at 1400 ℃ to 1450 ℃.Increase of temperature would enhance mullitization,and total consumption of cristobalite occurred from 1500 ℃ upward.The in-situ produced primary mullite from gangue upon heating can be seeds for the growth of evenly dispersed mullite puncheons.Specimen sintered at 1550 ℃ consists of puncheons with an aspect ratio of 2~4,regionally forming an interlocking structure.
Coal gangue Mullite Puncheon grain
Haipeng Ji Zhaohui Huang Kai Chen Minghao Fang Juntong Huang Yan-gai Liu
School of Materials Science and Technology,China University of Geosciences,Beijing 10083,China
国际会议
桂林
英文
17-21
2012-07-16（万方平台首次上网日期，不代表论文的发表时间）