Phase Formation and Process Analysis of SiC-Al_2O_3-Al_6Si_2O_(13) Composite Powder via Carbothermal

• 作 者: ZHANG Bowen MA Beiyue YIN Yue LI Shiming ZHANG Zhan LI Guangqiang YU Jingkun
• 机 构: School of Metallurgy,Northeastern University,The State Key Laboratory of Refractories and Metallurgy
• 出 处: China's Refractories
• 发表日期: 2016年04期
• 关键词: mullite carbide alumina ceramics crystalline synthesizing disappear Reduction fa

Silicon carbide(SiC)-alumina(Al_2O_3)-mullite(Al_6Si_2O_(13)) composite powder was successfully synthesized at 1 550 ℃ for 5 h 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 composition and microstructure of products were investigated,and the formation process of the powder was also analyzed in detail.The products mainly consist ofβ-SiC,α-Al_2O_3,Al_6Si_2O_(13) and FeSi.Increasing carbon content favors the decomposition of Al_6Si_2O_(13) and formation of SiC.The average particle size of β-SiC andα-Al_2O_3 is about 1 μm and that of Al_6Si_2O_(13) is 5-10μm.The formation process of SiC-Al_2O_3-Al_6Si_2O_(13)powder includes the decomposition of mullite in fly ash and formation of SiC.

Silicon carbide (SiC) -alumina (Al_2O_3) -mullite (Al_6Si_2O_ (13)) composite powder was successfully synthesized at 1 550 ℃ for 5 h via carbothermal reduction reaction, and the effects of various mass ratios of active carbon to fly ash , 0.44 and 0.58) on the phase composition and microstructure of products were investigated, and the formation process of the powder was also analyzed in detail. These products mainly consist of β-SiC, α-Al_2O_3, Al_6Si_2O_ (13) and FeSi.Increasing carbon content favors the decomposition of Al_6Si_2O_ (13) and formation of SiC. The average particle size of β-SiC and α-Al_2O_3 is about 1 μm and that of Al_6Si_2O_ (13) is 5-10 μm. The formation process of SiC_Al_2O_3-Al_6Si_2O_ (13) powder includes the decomposition of mullite in fly ash and formation of SiC.