Ceramics-Silikáty 64, (3) 271 - 277 (2020) |
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EFFECT OF MgAl₂O₄ ON THE GROWTH OF β -Si₃Al₃O₃N₅ PREPARED BY CARBOTHERMAL REDUCTION BY NITRIDING
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Valdes Alfredo Flores 1, Almanza Robles Jose 1, Torres Torres Jesus 1, Ochoa Palacios Rocio 2, Escobedo Bocardo Jose 1, Cortes Hernandez Dora 1, Hernandez Garcia Hector 3
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1 Centro de Investigación y de Estudios Avanzados del IPN, Unidad Saltillo, Ave. Industria Metalúrgica 1062, Parque Industrial Saltillo-Ramos Arizpe, 25900 Ramos Arizpe, Coahuila México.
2 Tecnológico Nacional de México / I.T. Saltillo, Blvd. Venustiano Carranza, Saltillo, Coahuila, 25000 México.
3 Corporación Mexicana de Investigación en Materiales, Calle Ciencia y Tecnología No. 790, Fracc. Saltillo 400, Saltillo, Coah., 25290 México.
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Keywords: β-Si₃Al₃O₃N₅, Aluminum dross, Ceramic materials, Carbothermic reduction
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The β-Si₃Al₃O₃N₅ compound was experimentally prepared by carbothermal reduction by nitriding using pure SiO₂, Al₂O₃, C, and N₂. The effect of MgAl₂O₄ on the growth of β-Si₃Al₃O₃N₅ was investigated as a function of temperature and molar concentration of MgAl₂O₄. In this way, it was found that the formation of β-Si₃Al₃O₃N₅ when MgAl₂O₄ is present in concentrations lower than 13 wt. % occurs. However, when the MgAl₂O₄ concentration was as high as 25.6 wt. %, the formation of β-Si₃Al₃O₃N₅ compound was not attained and the formation of quaternary magnesium-rich SiAlON phases such as Mg-Si₄Al₂O₆N₄ was found. Moreover, the mechanistic steps during the consolidation of SiAlON type structures are presented and discussed. |
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doi: 10.13168/cs.2020.0016
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