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Effects of alumina impurity on the synthesis of composite ceramic powders by rich husk ash
- Wen-Jie YUAN,
- Ming-Yu FAN,
- Jun LI,
- Cheng-Ji DENG, and
- Hong-Xi ZHU
Material Science and Environmental Engineering26 Jul 2016
Preview Abstract
The carbothermal reduction and nitridation has been used to synthesize composite ceramic powders from rice husk ash (RHA) with alumina addition of 0.02, 0.1, 0.5 and 1 (Al₂O₃/SiO₂) respectively. The phase composition of products after calcining at high temperatures was almost sensitive to the Al₂O₃ content. The sequence of phase-formation except for SiC and Si₃N₄ with alumina addition was followed by Si₂N₂O→Si_1.62Al_0.38 N_1.62O_1.38→Si₃Al₃O₃N₅ for 1500 °C, and Si₃Al₃O₃N₅→AlN for 1550 °C. The results highlighted that effects of alumina impurity on the synthesis of composite ceramic powders from rich husk ash were significant.

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