Title: Oxidation prevention of silicon carbide powders

Authors: Yilmaz Firat Birtane; Azade Yelten; Eray Erzi; Mustafa M. Arikan; Suat Yilmaz

Addresses: Department of Metallurgical and Materials Engineering, Istanbul University, 34320 Avcilar, Istanbul, Turkey ' Department of Metallurgical and Materials Engineering, Istanbul University, 34320 Avcilar, Istanbul, Turkey ' Department of Metallurgical and Materials Engineering, Istanbul University, 34320 Avcilar, Istanbul, Turkey ' Department of Materials Science and Engineering, Akdeniz University, 07425 Alanya, Antalya, Turkey ' Department of Metallurgical and Materials Engineering, Istanbul University, 34320 Avcilar, Istanbul, Turkey

Abstract: Oxidation creates an important problem with the increasing temperature and additionally if one of the components contains an amount of carbon, then there will be a CO_x emission risk which has a detrimental effect for the atmosphere. One of the methods to prevent the oxidation of silicon carbide (SiC) is to coat it with Al₂O₃ which has high thermal stability. In this study, the properties of Al₂O₃ coated SiC composite powders were examined to prevent the oxidation of SiC particles by developing a thermal barrier coating and it is aimed to contribute for reducing the gases which make a greenhouse effect and cause global warming. Firstly, boehmite sol was prepared via the sol gel route and then 5 wt% β-SiC (< 100 nm) nanosized particles were added to the boehmite sol and gelation was completed. Alumina coated SiC powders were heat treated at 100, 550, 1,000, 1,300 and 1,600°C under dry air and argon atmospheres. Characterisation analyses showed that alumina coated SiC particles underwent to slightly internal oxidation with the partial oxidation depending on the oxygen ion mobility during the transformation from boehmite to alumina in the interior atmosphere while alumina coated SiC particles gained oxidation resistance against the outer atmosphere.

Keywords: oxidation prevention; boehmitic sol; heat treatment; Al2O3; alumina coating; silicon carbide powders; ceramic matrix composites; CMCs; thermal analysis; phase analysis; microstructure; sol gel; CO2; carbon dioxide; carbon emissions; coated SiC powders; thermal barrier coatings; nanoparticles; nanotechnology.

DOI: 10.1504/IJGW.2017.082773

International Journal of Global Warming, 2017 Vol.11 No.3, pp.273 - 284

Received: 02 Dec 2014
Accepted: 22 Feb 2015
Published online: 12 Mar 2017 *

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