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 language | English (US) |
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Pages (from-to) | 5783-5786 |
Number of pages | 4 |
Journal | Journal of Applied Physics |
Volume | 83 |
Issue number | 11 |
DOIs | |
State | Published - Jun 1 1998 |
ASJC Scopus subject areas
- Physics and Astronomy(all)