Surface oxidation of nanocrystalline CVD TiB2 hard coatings revealed by cross-sectional nano-analytics and in-situ micro-cantilever testing
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F20%3APU140148" target="_blank" >RIV/00216305:26620/20:PU140148 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1016/j.surfcoat.2020.126181" target="_blank" >https://doi.org/10.1016/j.surfcoat.2020.126181</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.surfcoat.2020.126181" target="_blank" >10.1016/j.surfcoat.2020.126181</a>
Alternative languages
Result language
angličtina
Original language name
Surface oxidation of nanocrystalline CVD TiB2 hard coatings revealed by cross-sectional nano-analytics and in-situ micro-cantilever testing
Original language description
Nanocrystalline TiB2 coatings grown by chemical vapour deposition (CVD) are employed e.g. as hard protective coatings on cemented carbide cutting tools, owing to their high wear resistance, hardness and melting point, as well as superior thermal stability. This work applied novel cross-sectional nano-analytical techniques to investigate the effects of prolonged surface oxidation of a CVD bi-layer coating of similar to 3.4 mu m thickness, consisting of a nanocrystalline TiB2 protective top layer and a TiN diffusion-barrier bottom layer. Synchrotron X-ray diffraction with a nano-focussed 70 nm beam revealed cross-sectional phase compositions and residual stress gradients in the coating in as-deposited and oxidised states. Transmission electron microscopy showed a clear oxidation front, the existence of a similar to 400 nm thick zone of coexistence of TiB2 and rutile TiO2, which coincided with a marked decrease in compressive residual stress, as well as an overlying morphologically stratified TiO2 layer. In-situ micro-cantilever experiments confirmed the structural integrity of the TiB2 phase below the coexistence zone, where no significant oxidation-induced change in fracture stress was detected, while Young's modulus decreased by similar to 25%. In conclusion, the pursued nano-analytics approach revealed detailed cross-sectional correlations between oxidation-related coating disintegration, microstructure, residual stresses and mechanical properties.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20506 - Coating and films
Result continuities
Project
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Continuities
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Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Surface and Coatings Technology
ISSN
0257-8972
e-ISSN
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Volume of the periodical
399
Issue of the periodical within the volume
1
Country of publishing house
CH - SWITZERLAND
Number of pages
9
Pages from-to
„126181-1“-„126181-9“
UT code for WoS article
000563807700067
EID of the result in the Scopus database
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