Protecting the MoSi2 healing particles for thermal barrier coatings using a sol-gel produced Al2O3 coating

A. L. Carabat; M.J. Meijerink; J. C. Brouwer; E. M. Kelder; J. R. van Ommen; S. van der Zwaag; W. G. Sloof

doi:10.1016/j.jeurceramsoc.2018.02.002

Protecting the MoSi₂ healing particles for thermal barrier coatings using a sol-gel produced Al₂O₃ coating

A. L. Carabat^*, M.J. Meijerink, J. C. Brouwer, E. M. Kelder, J. R. van Ommen, S. van der Zwaag, W. G. Sloof

^*Corresponding author for this work

Research output: Contribution to journal › Article › Scientific › peer-review

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Abstract

A successful sol-gel process to encapsulate molybdenum di-silicide MoSi₂ particles with a closed and thermally stable Al₂O₃ layer using aluminium tri-sec-butoxide as a precursor is presented. The processing conditions such as precursor selection and temperature were optimized through analysing the interaction of the MoSi₂ particles with the sol. The application of the sol-gel based coating was followed by calcining the coated particles at temperatures between 900 and 1200 °C in Ar. The shell composition and the mechanical stability of the microcapsule were analysed by means of X-ray diffraction, scanning electron microscopy and thermogravimetric analysis. Upon calcining at 1200 °C in Ar, the MoSi₂ core remains intact as it is, covered by an α - alumina shell with a thickness of about 0.6 μm. The stability tests proved that the encapsulate particles are about five times more oxidation resistant than the uncoated MoSi₂ particles.

Original language	English
Pages (from-to)	2728-2734
Journal	Journal of the European Ceramic Society
Volume	38
Issue number	7
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2018.02.002
Publication status	Published - 2018

Bibliographical note

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Keywords

Alumina shell
MoSi
Self-healing thermal barrier coatings
Sol-gel

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10.1016/j.jeurceramsoc.2018.02.002

1-s2.0-S0955221918300761-main-1Final published version, 2.24 MB

Cite this

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title = "Protecting the MoSi2 healing particles for thermal barrier coatings using a sol-gel produced Al2O3 coating",

abstract = "A successful sol-gel process to encapsulate molybdenum di-silicide MoSi2 particles with a closed and thermally stable Al2O3 layer using aluminium tri-sec-butoxide as a precursor is presented. The processing conditions such as precursor selection and temperature were optimized through analysing the interaction of the MoSi2 particles with the sol. The application of the sol-gel based coating was followed by calcining the coated particles at temperatures between 900 and 1200 °C in Ar. The shell composition and the mechanical stability of the microcapsule were analysed by means of X-ray diffraction, scanning electron microscopy and thermogravimetric analysis. Upon calcining at 1200 °C in Ar, the MoSi2 core remains intact as it is, covered by an α - alumina shell with a thickness of about 0.6 μm. The stability tests proved that the encapsulate particles are about five times more oxidation resistant than the uncoated MoSi2 particles.",

keywords = "Alumina shell, MoSi, Self-healing thermal barrier coatings, Sol-gel",

author = "Carabat, {A. L.} and M.J. Meijerink and Brouwer, {J. C.} and Kelder, {E. M.} and {van Ommen}, {J. R.} and {van der Zwaag}, S. and Sloof, {W. G.}",

note = "Green Open Access added to TU Delft Institutional Repository {\textquoteleft}You share, we take care!{\textquoteright} – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.",

year = "2018",

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AU - Brouwer, J. C.

AU - Kelder, E. M.

AU - van Ommen, J. R.

AU - van der Zwaag, S.

AU - Sloof, W. G.

N1 - Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

PY - 2018

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N2 - A successful sol-gel process to encapsulate molybdenum di-silicide MoSi2 particles with a closed and thermally stable Al2O3 layer using aluminium tri-sec-butoxide as a precursor is presented. The processing conditions such as precursor selection and temperature were optimized through analysing the interaction of the MoSi2 particles with the sol. The application of the sol-gel based coating was followed by calcining the coated particles at temperatures between 900 and 1200 °C in Ar. The shell composition and the mechanical stability of the microcapsule were analysed by means of X-ray diffraction, scanning electron microscopy and thermogravimetric analysis. Upon calcining at 1200 °C in Ar, the MoSi2 core remains intact as it is, covered by an α - alumina shell with a thickness of about 0.6 μm. The stability tests proved that the encapsulate particles are about five times more oxidation resistant than the uncoated MoSi2 particles.

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