Thermal conductivity of κ-Al2O3 and α-Al2O3 wear-resistant coatings
1998; American Institute of Physics; Volume: 83; Issue: 11 Linguagem: Inglês
10.1063/1.367500
ISSN1520-8850
AutoresDavid G. Cahill, Seung Min Lee, T. I. Selinder,
Tópico(s)Advanced materials and composites
ResumoThe 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.
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