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Synthesis of an oxidation-resistant SiC coating on graphite and modeling analysis with thermodynamics calculations

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Published/Copyright: November 3, 2016
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 107 Issue 11

Abstract

A graded SiC coating was prepared on a graphite substrate by a pack cementation technique at 1 873 K to improve the oxidation resistance. The HSC Chemistry software was used for thermodynamics calculations. The coating was characterized by means of X-ray diffraction and scanning electron microscopy. Isothermal oxidation testing of the samples was performed at 1 773 K in air. The modeling analysis indicated that aluminum oxide can be reduced and an SiC coating can be formed due to the reaction of silicon with CO and carbon with SiO. The growth of the SiC nanofibers was attributed to the gaseous reaction of SiO with CO. A 600 μm thick SiC layer can be observed at the graphite–coating interface. The simulation and experimental results were consistent with each other. The mass loss of the SiC coated sample was 1.1 % after oxidation for 10 h, whereas the graphite was fully oxidized after 1 h.

Keywords: Silicon carbide; Coating; HSC Chemistry; Pack cementation; Graphite
*Correspondence address, Jalil Pourasad, Ph. D. Candidate, Faculty of Materials and Manufacturing Technology, Malek-Ashtar University of Technology, Tehran 84817-75631, Iran, Tel.: +98-912-5870415, Fax: +98-21-22952286, E-mail:

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Received: 2016-06-07
Accepted: 2016-07-25
Published Online: 2016-11-03
Published in Print: 2016-11-10

© 2016, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.111429
Keywords for this article
Silicon carbide; Coating; HSC Chemistry; Pack cementation; Graphite

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. In-situ annealing and computation study of cube texture development in a commercial aluminum alloy
  5. Dislocation dynamics modeling of plastic deformation in single-crystal copper at high strain rates
  6. Investigation of mechanical properties of tubular aluminum foams
  7. Dependence of microstructure, microhardness, tensile strength and electrical resistivity on growth rates for directionally solidified Zn-Al-Sb eutectic alloy
  8. Effects of temperature on fatigue limits and fracture morphologies of 40Cr steels formed by warm extrusion
  9. Synthesis of an oxidation-resistant SiC coating on graphite and modeling analysis with thermodynamics calculations
  10. Improved corrosion inhibition of 3-amino-1,2,4-triazole on mild steel electrode in HCl solution using surface nanocrystallization
  11. Chunky graphite formation in ductile cast irons: effect of silicon, carbon and rare earths
  12. Fabrication of 3D porous MoS2–GO nanocomposite monolith as a promising adsorbent
  13. Short Communications
  14. Two-stage method of synthesis of ultrafine powder of α-phase metallic cobalt
  15. Developing a multifunctional bio-ceramics composite based on β-tricalcium phosphate working as a single carrier for calcium supplement and low-dose drugs
  16. DGM News
  17. DGM News
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