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Oxidation behaviour of pressureless liquid-phase-sintered α-SiC with additions of 5Al2O3 +3RE2O3 (RE=La, Nd, Y, Er, Tm, or Yb)

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Title: Oxidation behaviour of pressureless liquid-phase-sintered α-SiC with additions of 5Al2O3 +3RE2O3 (RE=La, Nd, Y, Er, Tm, or Yb)
Authors: Rodríguez-Rojas, F.1, Ortiz, A.L.1 alortiz@unex.es, Guiberteau, F.1, Nygren, M.2
Source: Journal of the European Ceramic Society. Nov2010, Vol. 30 Issue 15, p3209-3217. 9p.
Subjects: Sintering, Silicon carbide, Diffusion, Corrosion & anti-corrosives, Oxidation, Thermogravimetry, Crystal texture
Abstract: Abstract: The oxidation behaviour of pressureless liquid-phase-sintered (PLPS) α-SiC was investigated as a function of the sintering additives of 5Al2O3 +3RE2O3 (RE=La, Nd, Y, Er, Tm, or Yb) by thermogravimetry experiments in oxygen at 1075–1400°C for up to 22h. It was found that the oxidation is in all cases passive and protective, with kinetics governed by the arctan-rate law. This is because the PLPS SiC ceramics develop oxide scales having no cracks or open porosity and accordingly prevent the parent material from direct contact with oxygen. In addition, these oxide scales crystallize gradually during the exposure to the oxidizing atmosphere with the attendant reduction in the amorphous cross-section available for oxygen diffusion. It was also found that the rate-limiting mechanism of the oxidation is outward diffusion of RE3+ cations from the intergranular phase into the oxide scale, and that the activation energy of the oxidation increases with increasing size of the RE3+ cation. It was also observed that the oxidation of PLPS SiC increases with increasing size of the RE3+ cation, an effect that is especially marked for cation sizes above 0.9Å because the oxidation rate becomes several orders of magnitude faster. This trend is attributable to the oxide scales being more crystalline, and containing crystals that are more refractory and amorphous residual phases that are more viscous as the size of the RE3+ cation decreases. Finally, implications for the design of PLPS SiC ceramics with superior oxidation resistance are discussed. [ABSTRACT FROM AUTHOR]
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.)
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+the+European+Ceramic+Society%22">Journal of the European Ceramic Society</searchLink>. Nov2010, Vol. 30 Issue 15, p3209-3217. 9p.
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  Data: <searchLink fieldCode="DE" term="%22Sintering%22">Sintering</searchLink><br /><searchLink fieldCode="DE" term="%22Silicon+carbide%22">Silicon carbide</searchLink><br /><searchLink fieldCode="DE" term="%22Diffusion%22">Diffusion</searchLink><br /><searchLink fieldCode="DE" term="%22Corrosion+%26+anti-corrosives%22">Corrosion & anti-corrosives</searchLink><br /><searchLink fieldCode="DE" term="%22Oxidation%22">Oxidation</searchLink><br /><searchLink fieldCode="DE" term="%22Thermogravimetry%22">Thermogravimetry</searchLink><br /><searchLink fieldCode="DE" term="%22Crystal+texture%22">Crystal texture</searchLink>
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  Data: Abstract: The oxidation behaviour of pressureless liquid-phase-sintered (PLPS) α-SiC was investigated as a function of the sintering additives of 5Al2O3 +3RE2O3 (RE=La, Nd, Y, Er, Tm, or Yb) by thermogravimetry experiments in oxygen at 1075–1400°C for up to 22h. It was found that the oxidation is in all cases passive and protective, with kinetics governed by the arctan-rate law. This is because the PLPS SiC ceramics develop oxide scales having no cracks or open porosity and accordingly prevent the parent material from direct contact with oxygen. In addition, these oxide scales crystallize gradually during the exposure to the oxidizing atmosphere with the attendant reduction in the amorphous cross-section available for oxygen diffusion. It was also found that the rate-limiting mechanism of the oxidation is outward diffusion of RE3+ cations from the intergranular phase into the oxide scale, and that the activation energy of the oxidation increases with increasing size of the RE3+ cation. It was also observed that the oxidation of PLPS SiC increases with increasing size of the RE3+ cation, an effect that is especially marked for cation sizes above 0.9Å because the oxidation rate becomes several orders of magnitude faster. This trend is attributable to the oxide scales being more crystalline, and containing crystals that are more refractory and amorphous residual phases that are more viscous as the size of the RE3+ cation decreases. Finally, implications for the design of PLPS SiC ceramics with superior oxidation resistance are discussed. [ABSTRACT FROM AUTHOR]
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  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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      – Type: doi
        Value: 10.1016/j.jeurceramsoc.2010.07.013
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      – Code: eng
        Text: English
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      – SubjectFull: Sintering
        Type: general
      – SubjectFull: Silicon carbide
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      – SubjectFull: Diffusion
        Type: general
      – SubjectFull: Corrosion & anti-corrosives
        Type: general
      – SubjectFull: Oxidation
        Type: general
      – SubjectFull: Thermogravimetry
        Type: general
      – SubjectFull: Crystal texture
        Type: general
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      – TitleFull: Oxidation behaviour of pressureless liquid-phase-sintered α-SiC with additions of 5Al2O3 +3RE2O3 (RE=La, Nd, Y, Er, Tm, or Yb)
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            NameFull: Rodríguez-Rojas, F.
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            NameFull: Ortiz, A.L.
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            NameFull: Guiberteau, F.
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            NameFull: Nygren, M.
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              Text: Nov2010
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              Y: 2010
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