Abstract
This work deals with the microstructures and wear properties of chemical vapour deposited γ-Al 2O 3. The γ-Al 2O 3 coatings were deposited at 800 °C on TiN and Ti(C,N) pre-coated cemented carbide substrates. The microstructures developed in the γ-Al 2O 3 coatings and the influence of the nucleation surface on the growth of γ-Al 2O 3 were characterised using transmission electron microscopy, electron energy-loss spectroscopy and X-ray diffraction. The γ-Al 2O 3 coatings were fine-grained with a high density of {1 1 1} growth twins and contained some residual sulphur. γ-Al 2O 3 was found to grow epitaxially on the investigated substrates. The mechanical properties were evaluated in metal cutting and were compared with those of κ-Al 2O 3 coated tools. As compared with the κ-Al 2O 3 coatings, the γ-Al 2O 3 coatings exhibited slightly worse adhesion and tendency for edge chipping. However, the γ-Al 2O 3 coatings showed better crater wear resistance on the rake face than κ-Al 2O 3 coatings.
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