添加La2O3对粉煤灰合成Al2O3-SiC复合粉体的影响*

doi:10.11896/j.issn.1005-023X.2017.04.024

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Abstract Al₂O₃-SiC powders were synthesized by carbothermal reduction reaction in an argon atmosphere, with fly ash and activated carbon as raw materials. It provides a feasibility route with low-cost to the synthesis of Al₂O₃-SiC powders. The influence of La₂O₃ addition on the synthesis process was studied. The phase composition and microstructure of the powders were characterized by XRD and SEM. Results showed that the Al₂O₃-SiC powders could be synthesized at 1 550 ℃ for 5 h, when the mass ratio of fly ash to activated carbon was 100∶44 with addition of 6% La₂O₃ (mass fraction). The powders had good performance, uniform particle distribution, and the average particle size was about 0.5-1 μm. The synthesis temperature of composite powder with La₂O₃ was 50 ℃ lower than that of the mixture without La₂O₃.

Key words： fly ash carbothermal reduction reaction Al₂O₃-SiC La₂O₃

Published: 02 May 2018

CLC number:

TB332

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.04.024 OR http://www.mater-rep.com/EN/Y2017/V31/I4/111

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