2014-Sustainable Industrial Processing Summit
SIPS 2014 Volume 5: Composite, Ceramic, Quasi-crystals, Nanomaterials & Coatings
| Editors: | Kongoli F |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2014 |
| Pages: | 578 pages |
| ISBN: | 978-1-987820-07-2 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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TAGUCHI EXPERIMENTAL DESIGN FOR FILMS/COATINGS OPTIMIZATION OF (NH4)2SiF6. (NH4)3AlF6, NH4AlF4 PHASES ON ALUMINUM SHEET SUBSTRATES BY HYSY-CVD ROUTE
Saul A. Gallardo-Heredia1; Jose C. Flores-Garcia1; Evangelina Trujillo-Vazquez1; Martin Pech-Canul1; Maximo A. Pech-Canul2;1CINVESTAV-SALTILLO, Ramos Arizpe, Mexico; 2CINVESTAV-MERIDA, Merida, Mexico;
Type of Paper: Regular
Id Paper: 194
Topic: 16
Abstract:
An L8 Taguchi experiment was designed and conducted to determine the quantitative effect of processing parameters (test temperature and time, nitrogen gas flow rate, NH4OH position, Na2SiF6 quantity) on the amount (weight) of films/coatings on aluminum sheet substrates. Films/coatings based on (NH4)2SiF6 (NH4)3AlF6 and NH4AlF4 were deposited on aluminum sheet substrates by the HYSY-CVD route (Hybrid system chemical vapor deposition), using Na2SiF6, NH4OH and N2 as precursors. After deposition treatments, the coated aluminum samples were characterized by SEM (Scanning Electronic Microscopy), EDS (Energy Dispersive Scanning) and XRD (Diffraction X-Rays). The results from the analyses by XRD showed that films/coating are formed by a mix of (NH4)2SiF6, (NH4)3AlF6, and NH4AlF4 phases. The SEM analysis shows that films/coating microstructure has crystals with polyhedral, cuboid and hexagonal geometry and size under 5 μm, and the films/coatings have a thickness of approximately 25 μm. The results from the analysis of variance (ANOVA) indicate that the parameter that most significantly affects the variability in the amount of film/coating on the aluminum sheet is the test temperature (T), with 84.2 % contribution. The optimum conditions to maximize the amount of coatings on aluminum sheet substrates are: 15 g of Na2SiF6, test time of 30 min, processing temperature of 1000°C, a nitrogen flow rate of 15 cm3/min and NH4OH precursor liquid placed in the center of the reactor.