The Oxidation of cobalt‐tantalum base alloys containing carbon
Identifieur interne : 001971 ( Main/Exploration ); précédent : 001970; suivant : 001972The Oxidation of cobalt‐tantalum base alloys containing carbon
Auteurs : M. E. El-Dahshan [Arabie saoudite] ; M. I. Hazzaa [Arabie saoudite]Source :
- Materials and Corrosion [ 0947-5117 ] ; 1987-08.
Abstract
The oxidation of cobalt‐tantalum carbon alloys, containing 10 and 15 wt.% Ta and carbon in the range 0–1 wt%, was carried out in oxygen and air at atmospheric pressure at 900, 1000 and 1100°C. The alloys oxidised according to the parabolic rate law with activation energy of about 38 Kcal/mole. In general, the addition of tantalum decreases the oxidation rates, in comparison with cobalt and with the same mass of chromium added to cobalt. Again, the presence of carbon in the Co‐Ta alloys decreases its oxidation rates in comparison with carbon‐free alloys. The scales formed on Co‐Ta and Co‐Ta‐C alloys consist mainly of an outer layer of cobalt oxide, CoO, and an inner porous layer of mixture of oxides: cobalt oxide; CoO, tantalum oxide; Ta2O5, and solid solution of these two oxides; CoTaO4 at all temperatures in the range of 900°‐1100°C. The binary Co −10% Ta and Co −15% Ta show an internal oxidation along the internal phase, increasing of alloy tantalum content increases the density of the internal phase. The presence of carbon in the ternary Co‐Ta‐C alloys has little effect and there is no apparent preferential penetration along the tantalum carbide network. In contrast to carbide present in Co‐Cr‐C alloys, where these carbides were preferentially attacked, the outer scale was disrupted, due to the formation of carbon gaseous oxides.
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DOI: 10.1002/maco.19870380805
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E." last="El-Dahshan">M. E. El-Dahshan</name><affiliation wicri:level="1"><country xml:lang="fr">Arabie saoudite</country><wicri:regionArea>Department of Chemical Engineering, King Saud University, P.O.B. 800, Riyadh</wicri:regionArea><wicri:noRegion>Riyadh</wicri:noRegion></affiliation></author><author><name sortKey="Hazzaa, M I" sort="Hazzaa, M I" uniqKey="Hazzaa M" first="M. I." last="Hazzaa">M. I. Hazzaa</name><affiliation wicri:level="1"><country xml:lang="fr">Arabie saoudite</country><wicri:regionArea>Department of Chemical Engineering, King Saud University, P.O.B. 800, Riyadh</wicri:regionArea><wicri:noRegion>Riyadh</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">Materials and Corrosion</title><title level="j" type="abbrev">Materials and Corrosion</title><idno type="ISSN">0947-5117</idno><idno type="eISSN">1521-4176</idno><imprint><publisher>WILEY‐VCH Verlag GmbH</publisher><pubPlace>Weinheim</pubPlace><date type="published" when="1987-08">1987-08</date><biblScope unit="volume">38</biblScope><biblScope unit="issue">8</biblScope><biblScope unit="page" from="422">422</biblScope><biblScope unit="page" to="431">431</biblScope></imprint><idno type="ISSN">0947-5117</idno></series><idno type="istex">46138385B4239B76F8AD4FF131FD9CC3A1044BCD</idno><idno type="DOI">10.1002/maco.19870380805</idno><idno type="ArticleID">MACO19870380805</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0947-5117</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The oxidation of cobalt‐tantalum carbon alloys, containing 10 and 15 wt.% Ta and carbon in the range 0–1 wt%, was carried out in oxygen and air at atmospheric pressure at 900, 1000 and 1100°C. The alloys oxidised according to the parabolic rate law with activation energy of about 38 Kcal/mole. In general, the addition of tantalum decreases the oxidation rates, in comparison with cobalt and with the same mass of chromium added to cobalt. Again, the presence of carbon in the Co‐Ta alloys decreases its oxidation rates in comparison with carbon‐free alloys. The scales formed on Co‐Ta and Co‐Ta‐C alloys consist mainly of an outer layer of cobalt oxide, CoO, and an inner porous layer of mixture of oxides: cobalt oxide; CoO, tantalum oxide; Ta2O5, and solid solution of these two oxides; CoTaO4 at all temperatures in the range of 900°‐1100°C. The binary Co −10% Ta and Co −15% Ta show an internal oxidation along the internal phase, increasing of alloy tantalum content increases the density of the internal phase. The presence of carbon in the ternary Co‐Ta‐C alloys has little effect and there is no apparent preferential penetration along the tantalum carbide network. In contrast to carbide present in Co‐Cr‐C alloys, where these carbides were preferentially attacked, the outer scale was disrupted, due to the formation of carbon gaseous oxides.</div></front></TEI><affiliations><list><country><li>Arabie saoudite</li></country></list><tree><country name="Arabie saoudite"><noRegion><name sortKey="El Ahshan, M E" sort="El Ahshan, M E" uniqKey="El Ahshan M" first="M. E." last="El-Dahshan">M. E. El-Dahshan</name></noRegion><name sortKey="Hazzaa, M I" sort="Hazzaa, M I" uniqKey="Hazzaa M" first="M. I." last="Hazzaa">M. I. Hazzaa</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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