Phase Formation and Process Analysis of SiC-Al2O3-Al6Si2O13 Composite Powders via Carbothermal Reduction of Fly Ash at 1550℃
Silicon carbide (SiC)-alumina (Al2O3)-mullite (Al6Si2O13) composite powders were successfully synthesized at 1550℃ for 5h via carbothermal reduction reaction, and the effects of various mass ratios of active carbon to fly ash (0.38, 0.44 and 0.58)on the phase compositions and microstructures of products were investigated, and the formation process of the powders was also analyzed in detail.The products mainly consist of β-SiC, a-Al2O3, Al6Si2O13 and FeSi.Increasing carbon content favors the decomposition of Al6Si2O13 and formation of SiC.The average particle sizes of β-SiC and α-Al2O3 as well as Al6Si2O13 are about 1μm and 5-10μm, respectively.The formation process of SiC-Al2O3-Al6Si2O13 powders includes the decomposition of mullite in fly ash and formation of SiC.
fly ash carbothermal reduction silicon carbide composite powders
ZHANG Bowen MA Beiyue YIN Yue LI Shiming ZHANG Zhan LI Guangqiang YU Jingkun
School of Metallurgy,Northeastern University,Shenyang 110819,China The State Key Laboratory of Refractories and Metallurgy,Key Laboratory for Ferrous Metallurgy and Re
国际会议
西安
英文
1-5
2016-09-20（万方平台首次上网日期，不代表论文的发表时间）