ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 64, (3) 271 - 277 (2020)


EFFECT OF MgAl₂O₄ ON THE GROWTH OF β -Si₃Al₃O₃N₅ PREPARED BY CARBOTHERMAL REDUCTION BY NITRIDING
 
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
 
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.

Keywords: β-Si₃Al₃O₃N₅, Aluminum dross, Ceramic materials, Carbothermic reduction
 

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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