Thermal conductivity of κ-Al2O3 and α-Al2O3 wear-resistant coatings

David G. Cahill, S. M. Lee, Torbjörn I. Selinder

Research output: Contribution to journalArticlepeer-review

Abstract

The thermal conductivities of α-Al2O3 and κ-Al2O3 wear-resistant coatings are measured using the 3ω method in the temperature range 80<T<600 K. The coatings are 13 μm thick and deposited by chemical vapor deposition on substrates of Co-cemented WC. The α-Al2O3 coating has a thermal conductivity comparable to sapphire at T>300 K. The relatively small thermal conductivity of κ-Al2O3, a factor of ∼3 smaller than α-Al2O3, suggests that this metastable phase of alumina can be applied as an effective thermal barrier for cutting tools.

Original languageEnglish (US)
Pages (from-to)5783-5786
Number of pages4
JournalJournal of Applied Physics
Volume83
Issue number11
DOIs
StatePublished - Jun 1 1998

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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