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2011-Sustainable Industrial Processing Summit
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| Editors: | Florian K |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2012 |
| Pages: | 646 pages |
| ISBN: | 978-0-9879917-6-8 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
Influence Of Aluminum Alloy Composition On The Variability Of The Surface Tension On SiC-SiO2 Substrates
Miguel Montoya-Davila1; MARTIN PECH-CANUL2; Rodrigo Escalera-Lozano3; Maximo Pech-Canul4;14UNIVERSIDAD AUTóNOMA DE ZACATECAS, Zacatecas, Mexico; 2CENTRO DE INVESTIGACION Y DE ESTUDIOS AVANZADOS DE, Saltillo, Mexico; 32UNIVERSIDAD DEL ISTMO, CAMPUS TEHUANTEPEC, Tehuantepec, Oax., , Mexico; 4CINVESTAV, Mérida, Mexico;
Type of Paper: Regular
Id Paper: 271
Topic: 9
Abstract:
Wettability studies of the ceramic by the liquid metal are essential to the design and manufacture of metal matrix composites, MMCs. In this work, the effect of aluminum alloy composition on the variability of the surface tension using SiC-SiO2 substrates was investigated. Circular plates (Φ = 3.2cm and h=1cm) of compacted α-SiC powders coated with SiO2 were used as substrates. Four aluminum alloys – with Si/Mg molar ratios: 0.116, 0.192, 0.895 and 1.049 – were used in sessile drop tests at 1100°C, with change in the atmosphere from Ar → N2 at 1000°C. The surface tension was determined using menisci’s digital photographs, and Dorsey´s equation. The metal/ceramic interface and the drop surface were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Results show that during the heating stage there is a decrease in the surface tension that ranges from 197.2 to 315.98 mN/m, and that during the holding stage a reduction as large as 513.25 mN/m can be attained. This notable outcome is attributed to the drop silicon enrichment by the dissolution of Mg2Si. And despite the low surface tension, non-wetting contact angles – ascribed to the presence of MgAl2O4 and MgO (in addition to AlN and Mg2Si) on the wrinkled drop surface – were observed.