caa a22 4500 445844051 CHVBK 20180317145353.0 cr unu---uuuuu 170323e20110201xx s 000 0 eng 10.1007/s11085-010-9216-4 doi (NATIONALLICENCE)springer-10.1007/s11085-010-9216-4 Active Oxidation of SiC [Elektronische Daten] [N. Jacobson, D. Myers] Silicon carbide (SiC) forms a protective condensed-phase oxide (SiO2) in passive oxidation and a volatile sub-oxide (SiO(g)) in active oxidation. The transition between these two modes of oxidation and the rates of active oxidation are critical issues. A literature review indicates that impurity effects, the difference between active-to-passive and passive-to-active transitions, and the effect of total pressure on these transitions remain unexplored for SiC. Measurements were made in a thermogravimetric apparatus (TGA) by changing oxygen potentials either by blending O2/Ar mixtures or changing total pressures in a pure oxygen gas stream to the point where a transition occurs. Specimens were examined with standard optical and electron-optical techniques. Active-to-passive and passive-to-active transitions were measured and found to be similar for SiC, which is in contrast to pure Si. The similarity in SiC is attributed to SiC/SiO2 interfacial reactions producing the necessary conditions for passive scale formation (active-to-passive) or passive scale breakdown (passive-to-active). Comparable results were obtained in both the O2/Ar and reduced total O2 pressure cases for SiC. Springer Science+Business Media, LLC (outside the USA), 2010 Active oxidation nationallicence Silicon carbide nationallicence Ceramics nationallicence Jacobson N. NASA Glenn Research Center, 44135, Cleveland, OH, USA aut Myers D. East Central University, 74820, Ada, OK, USA aut Oxidation of Metals Springer US; http://www.springer-ny.com 75/1-2(2011-02-01), 1-25 0030-770X 75:1-2<1 2011 75 11085 https://doi.org/10.1007/s11085-010-9216-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11085-010-9216-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Jacobson N. NASA Glenn Research Center, 44135, Cleveland, OH, USA aut NATIONALLICENCE 700 1- Myers D. East Central University, 74820, Ada, OK, USA aut NATIONALLICENCE 773 0- Oxidation of Metals Springer US; http://www.springer-ny.com 75/1-2(2011-02-01), 1-25 0030-770X 75:1-2<1 2011 75 11085 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer