Effect of Ar or N2 sintering atmosphere on the high-temperature oxidation behaviour of pressureless liquid-phase-sintered α-SiC in air
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| Title: | Effect of Ar or N |
|---|---|
| Authors: | Rodríguez-Rojas, F.1, Ortiz, A.L. alortiz@unex.es, Borrero-López, O.1, Guiberteau, F.1 |
| Source: | Journal of the European Ceramic Society. Jan2010, Vol. 30 Issue 1, p119-128. 10p. |
| Subjects: | Argon, Nitrogen, Sintering, Oxidation, High temperatures, Silicon carbide, Air analysis, Chemical kinetics |
| Abstract: | Abstract: The effect of the Ar or N2 sintering atmosphere on the oxidation behaviour of pressureless liquid-phase-sintered (PLPS) α-SiC was studied. PLPS α-SiC specimens processed under Ar or N2 atmospheres were isothermally oxidized at 1100–1450°C in air for up to 500h, and their oxidation kinetics, activation energy, and rate-controlling mechanisms were compared. It was found that, regardless of the sintering atmosphere, the oxidation is passive due to the formation of oxide scales. In addition, below 1350°C the oxidation is protective, with a kinetics that follows initially the arctan-rate law and then the parabolic-rate law. However, from 1350°C onwards the oxidation becomes only semi-protective, with a kinetics that obeys the arctan-rate law briefly and then the paralinear-rate law. Furthermore, the activation energies and rate-controlling mechanisms are similar for the arctan and paralinear oxidations, but different for the parabolic oxidation. It was also observed that the N2-processed material oxidizes more slowly than the Ar-processed material below 1200°C due to a greater crystallization of its oxide scale, whereas above 1200°C the Ar-processed material is more oxidation-resistant due to greater viscosity of its oxide liquid. Implications concerning the optimization of the processing route of PLPS SiC for high-temperature applications in air are discussed. [Copyright &y& Elsevier] |
| Copyright of Journal of the European Ceramic Society is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 44581952 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Effect of Ar or N<subscript>2</subscript> sintering atmosphere on the high-temperature oxidation behaviour of pressureless liquid-phase-sintered α-SiC in air – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Rodríguez-Rojas%2C+F%2E%22">Rodríguez-Rojas, F.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Ortiz%2C+A%2EL%2E%22">Ortiz, A.L.</searchLink><i> alortiz@unex.es</i><br /><searchLink fieldCode="AR" term="%22Borrero-López%2C+O%2E%22">Borrero-López, O.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Guiberteau%2C+F%2E%22">Guiberteau, F.</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+the+European+Ceramic+Society%22">Journal of the European Ceramic Society</searchLink>. Jan2010, Vol. 30 Issue 1, p119-128. 10p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Argon%22">Argon</searchLink><br /><searchLink fieldCode="DE" term="%22Nitrogen%22">Nitrogen</searchLink><br /><searchLink fieldCode="DE" term="%22Sintering%22">Sintering</searchLink><br /><searchLink fieldCode="DE" term="%22Oxidation%22">Oxidation</searchLink><br /><searchLink fieldCode="DE" term="%22High+temperatures%22">High temperatures</searchLink><br /><searchLink fieldCode="DE" term="%22Silicon+carbide%22">Silicon carbide</searchLink><br /><searchLink fieldCode="DE" term="%22Air+analysis%22">Air analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+kinetics%22">Chemical kinetics</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Abstract: The effect of the Ar or N2 sintering atmosphere on the oxidation behaviour of pressureless liquid-phase-sintered (PLPS) α-SiC was studied. PLPS α-SiC specimens processed under Ar or N2 atmospheres were isothermally oxidized at 1100–1450°C in air for up to 500h, and their oxidation kinetics, activation energy, and rate-controlling mechanisms were compared. It was found that, regardless of the sintering atmosphere, the oxidation is passive due to the formation of oxide scales. In addition, below 1350°C the oxidation is protective, with a kinetics that follows initially the arctan-rate law and then the parabolic-rate law. However, from 1350°C onwards the oxidation becomes only semi-protective, with a kinetics that obeys the arctan-rate law briefly and then the paralinear-rate law. Furthermore, the activation energies and rate-controlling mechanisms are similar for the arctan and paralinear oxidations, but different for the parabolic oxidation. It was also observed that the N2-processed material oxidizes more slowly than the Ar-processed material below 1200°C due to a greater crystallization of its oxide scale, whereas above 1200°C the Ar-processed material is more oxidation-resistant due to greater viscosity of its oxide liquid. Implications concerning the optimization of the processing route of PLPS SiC for high-temperature applications in air are discussed. [Copyright &y& Elsevier] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of the European Ceramic Society is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.jeurceramsoc.2009.08.004 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 10 StartPage: 119 Subjects: – SubjectFull: Argon Type: general – SubjectFull: Nitrogen Type: general – SubjectFull: Sintering Type: general – SubjectFull: Oxidation Type: general – SubjectFull: High temperatures Type: general – SubjectFull: Silicon carbide Type: general – SubjectFull: Air analysis Type: general – SubjectFull: Chemical kinetics Type: general Titles: – TitleFull: Effect of Ar or N2 sintering atmosphere on the high-temperature oxidation behaviour of pressureless liquid-phase-sintered α-SiC in air Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Rodríguez-Rojas, F. – PersonEntity: Name: NameFull: Ortiz, A.L. – PersonEntity: Name: NameFull: Borrero-López, O. – PersonEntity: Name: NameFull: Guiberteau, F. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 01 Text: Jan2010 Type: published Y: 2010 Identifiers: – Type: issn-print Value: 09552219 Numbering: – Type: volume Value: 30 – Type: issue Value: 1 Titles: – TitleFull: Journal of the European Ceramic Society Type: main |
| ResultId | 1 |
