Thermodynamics and Oxidation Behaviour of Crystalline Silicon Carbide (3C) with Atomic Oxygen and Ozone
Joint Authors
Ghosh, Kunal
Varadachari, Chandrika
Bhowmick, Ritabrata
Source
Issue
Vol. 2012, Issue 2012 (31 Dec. 2012), pp.1-8, 8 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2012-12-13
Country of Publication
Egypt
No. of Pages
8
Main Subjects
Abstract EN
Thermodynamics of oxidation of crystalline silicon carbide (cubic form) by atomic oxygen (O) and ozone (O3) was derived to understand the thermodynamic stability of SiC in the upper atmosphere.
Equilibrium constants and equilibrium partial pressures were computed for each of eight possible reactions of SiC with O and O3.
Equilibrium activity diagrams were derived, showing the most stable oxidation products of SiC, represented in temperature-oxygen pressure (T-PO/O3) 2D diagrams.
Programs were developed in Mathematica.
The diagrams provide an understanding of the oxidation routes of SiC under changing levels of O/O3 and temperature, as encountered during reentry of space vehicles.
At high levels of the volatiles, CO2, CO, and SiO and temperatures between 1000 and 1500 K, oxidation by atomic oxygen or ozone first produced SiO2 + C followed by SiO2 + CO and finally SiO2 + CO2.
When volatiles were at very low pressures, the sequence of oxidation was SiO + CO followed by either SiO2 + CO or SiO + CO2 and finally SiO2 + CO2.
Stability of SiC in ozone was much lower than in atomic oxygen.
With both oxidants, the oxidation of the Si in SiC occurred prior to the oxidation of C.
Implications for mechanisms of thermal protection are discussed.
American Psychological Association (APA)
Varadachari, Chandrika& Bhowmick, Ritabrata& Ghosh, Kunal. 2012. Thermodynamics and Oxidation Behaviour of Crystalline Silicon Carbide (3C) with Atomic Oxygen and Ozone. ISRN Thermodynamics،Vol. 2012, no. 2012, pp.1-8.
https://search.emarefa.net/detail/BIM-447101
Modern Language Association (MLA)
Varadachari, Chandrika…[et al.]. Thermodynamics and Oxidation Behaviour of Crystalline Silicon Carbide (3C) with Atomic Oxygen and Ozone. ISRN Thermodynamics No. 2012 (2012), pp.1-8.
https://search.emarefa.net/detail/BIM-447101
American Medical Association (AMA)
Varadachari, Chandrika& Bhowmick, Ritabrata& Ghosh, Kunal. Thermodynamics and Oxidation Behaviour of Crystalline Silicon Carbide (3C) with Atomic Oxygen and Ozone. ISRN Thermodynamics. 2012. Vol. 2012, no. 2012, pp.1-8.
https://search.emarefa.net/detail/BIM-447101
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-447101