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Título del libro: Materials Science And Technology Conference And Exhibition 2017, Ms And T 2017
Título del capítulo: Improvement of aluminum alloy-rice husk ash wettability with surface modification of rice-husk ash (RHA) by Si3N4 coating

Autores UNAM:
NILOOFAR SOLTANI; AMIN BAHRAMI;
Autores externos:

Idioma:
Inglés
Año de publicación:
2017
Palabras clave:

Aluminum alloys; Aluminum coatings; Magnesium alloys; Silica; Silicon nitride; Silicon oxides; Substrates; Surface treatment; Wetting; Al matrix composites; Beneficial effects; Liquid state; Nitrogen atmospheres; Reagent grades; Rice husk ash; Sessile drop method; Wetting behavior; Silicon alloys


Resumen:

Success in the manufacture by the liquid-state route of Al-matrix composites reinforced with rice husk-ash (RHA) strongly depends upon its suitable wetting by the aluminum alloys. Since RHA is scarcely wetted by Al alloys, development of appropriate wetting technologies is paramount. Wettability study using the sessile drop method was conducted to elucidate the effect of Si3N4 coating by comparing the wetting behavior by two Al alloys of SiO2 (RHA) substrates, reagent-grade Si3N4 and Si3N4-coated RHA substrates. Results show that at 1200 °C, in nitrogen atmosphere with high Mg content in alloy, the minimal contact angles obtained for Si3N4, (RHA) SiO2 and Si3N4-coated RHA substrates are 30°, 72° and 35°, respectively, revealing the beneficial effect of modifying the surface of RHA with Si3N4 coating. © Copyright 2017 MS&T17®.


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