Materiales Compuestos de Boro Producidos por Síntesis Autopropagante a Temperaturas Elevadas
DOI:
https://doi.org/10.54139/revinguc.v28i1.5Palabras clave:
material compuesto, carburo de boro, síntesis autopropagante a temperaturas elevadas, análisis termodinámico.Resumen
Este trabajo es un estudio de las condiciones para la obtención de compuestos de carburo de boro, magnesia y óxido de aluminio por medio de síntesis autopropagante a temperaturas elevadas (SAPTE). Las sustancias utilizadas para sintetizar los compuestos incluyeron óxido de boro, magnesia y óxido de aluminio. Se llevó a cabo la SAPTE con la fase de reducción como la siguiente reacción agregada: 2B2O3+6Mg+xC −−−> ByCx+6MgO, 2B2O3+4Al+xC=2Al2O3+ByCx. La SAPTE térmica metálica que utiliza óxido de boro parece más atractiva que los métodos actuales de producción de carburo que se caracterizan por procesos fisicoquímicos de larga duración y múltiples etapas que requieren mayores costos de materiales, energía y financieros. Los cálculos termodinámicos de la composición de fase de los productos y la temperatura de combustión adiabática para los sistemas B2O3–Mg–C, B2O3–Al–C se realizaron en el programa FastStage. Los cálculos y pruebas permitieron identificar las condiciones óptimas de SAPTE. Los productos de SAPTE se examinaron mediante análisis de fase de rayos X y el método SEM. Las composiciones del sistema B2O3–Mg–C obtenido por SAPTE estuvieron representadas principalmente por carburo de boro, magnesia, borato de magnesio y Mg3B2O6. Los productos del sistema B2O3–Al–C obtenido por SAPTE contenían carburo de boro, alúmina y boruro de aluminio.
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