Hard wear-resistant coatings with anisotropic thermal conductivity for high thermal load applications

Bottger, P. H. M. (author): Laboratory of Nanoscale Materials Science, EMPA, Dübendorf, Switzerland

Braginsky, L. (author): Laboratory of Crystallography, ETH Zürich, Zürich, Switzerland

Shklover, V. (author): Laboratory of Crystallography, ETH Zürich, Zürich, Switzerland

Lewin, Erik (author): Laboratory of Nanoscale Materials Science, EMPA, Dübendorf, Switzerland

Patscheider, J. (author): Laboratory of Nanoscale Materials Science, EMPA, Dübendorf, Switzerland

Cahill, D. G. (author): Department of Materials Science and Engineering, University of Illinois, Urbana, Illinois, USA

Sobiech, M. (author): Oerlikon Balzers Coating AG, Balzers, Principality of Liechtenstein

(creator_code:org_t)

AIP Publishing, 2014
2014
English.
In: Journal of Applied Physics. - : AIP Publishing. - 0021-8979 .- 1089-7550. ; 116:1, s. 013507-

Related links:: https://www.dora.lib...; show more...; https://urn.kb.se/re...; https://doi.org/10.1...; show less...

Abstract Subject headings

High thermal load applications such as high speed dry cutting lead to high temperatures in the coated tool substrate that can soften the tool and high temperature gradients that can put stress on the coating/tool interface. In this work, theoretical considerations are presented for multilayer and graded protective coatings that can induce a significant anisotropy in their thermal conductivity. Solution of the heat equation shows that anisotropy of thermal conductivity has the potential to reduce temperatures and temperature gradients arising due to brief, localized heat at the coating surface ("hot-spots"). Experimental realization of high anisotropy is demonstrated in TiN/AlCrN multilayer coatings with variable layer thickness. In the coating with 50 nm bilayer periodicity, the highest anisotropy was obtained with a value of kappa(parallel to)/kappa(perpendicular to) = 3.0 +/- 0.9. Time-domain thermoreflectance is used to measure in-plane and cross-plane thermal conductivity of fabricated coatings. The observed high values of anisotropy of thermal conductivity are compared with theoretical predictions and its realisation is discussed with regard to the coating microstructure.

By the author/editor: Bottger, P. H. M ...; Braginsky, L.; Shklover, V.; Lewin, Erik; Patscheider, J.; Cahill, D. G.; show more...; Sobiech, M.; show less...

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Materials Engine ...; and Other Materials ...

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.