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Effect of the sintering additive content on the protective passive oxidation behaviour of pressureless liquid-phase-sintered SiC

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Title: Effect of the sintering additive content on the protective passive oxidation behaviour of pressureless liquid-phase-sintered SiC
Authors: Rodríguez-Rojas, Fernando1, Ortiz, Angel L. alortiz@materiales.unex.es, Borrero-López, Oscar1, Guiberteau, Fernando1
Source: Journal of the European Ceramic Society. Oct2012, Vol. 32 Issue 13, p3531-3536. 6p.
Subjects: Sintering, Oxidation, Phase transitions, Silicon carbide, Mixtures, Crystallization, Metal ions, Temperature effect
Abstract: Abstract: The long-term oxidation behaviour in air of pressureless liquid-phase-sintered SiC was investigated as a function of the sintering-additive content (a mixture of Y2O3 and Al2O3 in the 3:5 molar ratio) at oxidizing temperatures in the interval 1100–1300°C. It is shown that oxidation under these mild conditions is always passive, and with formation of protective oxide scales. However, the oxidation kinetics cannot be described appropriately by the parabolic-rate law. Instead, due to the gradual crystallization of the oxide scales during oxidation, it is more complex, exhibiting two different stretches given respectively by the arctan- and parabolic-rate laws. Furthermore, it was found that the rate-limiting mechanism of the initial arctan oxidation is the outward diffusion of metal cations from the secondary intergranular phase into the oxide scale, with the activation energy of the oxidation being very high and decreasing from 545 to 432kJ/mol with increasing sintering-additive content from 5 to 20wt%. The rate-limiting mechanism of the subsequent parabolic oxidation is however the inward diffusion of oxygen through the multicomponent oxide scale, with the activation energy being lower than before and also decreasing from 345 to 205kJ/mol as the sintering-additive content increases from 5 to 20wt%. It is also shown that the oxidation resistance decreases with increasing sintering-additive content, but that while the decrease is moderate up to 10wt%, it is very marked for greater contents. [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
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DbLabel: Engineering Source
An: 77288227
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Effect of the sintering additive content on the protective passive oxidation behaviour of pressureless liquid-phase-sintered SiC
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  Data: <searchLink fieldCode="AR" term="%22Rodríguez-Rojas%2C+Fernando%22">Rodríguez-Rojas, Fernando</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Ortiz%2C+Angel+L%2E%22">Ortiz, Angel L.</searchLink><i> alortiz@materiales.unex.es</i><br /><searchLink fieldCode="AR" term="%22Borrero-López%2C+Oscar%22">Borrero-López, Oscar</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Guiberteau%2C+Fernando%22">Guiberteau, Fernando</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+the+European+Ceramic+Society%22">Journal of the European Ceramic Society</searchLink>. Oct2012, Vol. 32 Issue 13, p3531-3536. 6p.
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  Data: <searchLink fieldCode="DE" term="%22Sintering%22">Sintering</searchLink><br /><searchLink fieldCode="DE" term="%22Oxidation%22">Oxidation</searchLink><br /><searchLink fieldCode="DE" term="%22Phase+transitions%22">Phase transitions</searchLink><br /><searchLink fieldCode="DE" term="%22Silicon+carbide%22">Silicon carbide</searchLink><br /><searchLink fieldCode="DE" term="%22Mixtures%22">Mixtures</searchLink><br /><searchLink fieldCode="DE" term="%22Crystallization%22">Crystallization</searchLink><br /><searchLink fieldCode="DE" term="%22Metal+ions%22">Metal ions</searchLink><br /><searchLink fieldCode="DE" term="%22Temperature+effect%22">Temperature effect</searchLink>
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  Data: Abstract: The long-term oxidation behaviour in air of pressureless liquid-phase-sintered SiC was investigated as a function of the sintering-additive content (a mixture of Y2O3 and Al2O3 in the 3:5 molar ratio) at oxidizing temperatures in the interval 1100–1300°C. It is shown that oxidation under these mild conditions is always passive, and with formation of protective oxide scales. However, the oxidation kinetics cannot be described appropriately by the parabolic-rate law. Instead, due to the gradual crystallization of the oxide scales during oxidation, it is more complex, exhibiting two different stretches given respectively by the arctan- and parabolic-rate laws. Furthermore, it was found that the rate-limiting mechanism of the initial arctan oxidation is the outward diffusion of metal cations from the secondary intergranular phase into the oxide scale, with the activation energy of the oxidation being very high and decreasing from 545 to 432kJ/mol with increasing sintering-additive content from 5 to 20wt%. The rate-limiting mechanism of the subsequent parabolic oxidation is however the inward diffusion of oxygen through the multicomponent oxide scale, with the activation energy being lower than before and also decreasing from 345 to 205kJ/mol as the sintering-additive content increases from 5 to 20wt%. It is also shown that the oxidation resistance decreases with increasing sintering-additive content, but that while the decrease is moderate up to 10wt%, it is very marked for greater contents. [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:
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        Value: 10.1016/j.jeurceramsoc.2012.05.004
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 6
        StartPage: 3531
    Subjects:
      – SubjectFull: Sintering
        Type: general
      – SubjectFull: Oxidation
        Type: general
      – SubjectFull: Phase transitions
        Type: general
      – SubjectFull: Silicon carbide
        Type: general
      – SubjectFull: Mixtures
        Type: general
      – SubjectFull: Crystallization
        Type: general
      – SubjectFull: Metal ions
        Type: general
      – SubjectFull: Temperature effect
        Type: general
    Titles:
      – TitleFull: Effect of the sintering additive content on the protective passive oxidation behaviour of pressureless liquid-phase-sintered SiC
        Type: main
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            NameFull: Rodríguez-Rojas, Fernando
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            NameFull: Ortiz, Angel L.
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            NameFull: Borrero-López, Oscar
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            NameFull: Guiberteau, Fernando
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            – D: 01
              M: 10
              Text: Oct2012
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              Y: 2012
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              Value: 32
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            – TitleFull: Journal of the European Ceramic Society
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