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| Study on oxidation behavior of SiC particles |
| LI Min1，WANG Ai-qin1,2，XIE Jing-pei1，SUN Ya-li1 |
1. College of Material Science and Engineering， He’nan University of Science and Technology， Luoyang 471023， China
2. Collaborative?Innovation?Center?of?Non-Ferrous?Metals，?He’nan Province， Luoyang 471023， China |
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Abstract The changes of microstructure and elements in SiC particles before and after oxidation were studied； the oxidation weight gain trend and influencing factors were also presented. The results show that， oxidation reaction makes the morphology of SiC particles changed greatly， which has passivation effect on the SiC particles， and makes SiC particles lose sharp edges， tending to be smoother. SiO2 forms on SiC particles surface after oxidation. During the early oxidation stage， the weight of SiC increases with the increasing oxidation temperature and oxidation time， the oxidation rate is mainly controlled by the interfacial chemical reaction rate. During later oxidation stage， the weight of the SiC increases slowly， and the oxidation rate is controlled by the diffusion rate of O2 and CO in the surface oxide film. A simple estimation formula for oxide thickness of SiC particles was proposed.
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Received: 24 March 2015
Published: 01 February 2016
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2016, Vol. 26 
