Abstract
AbstractCrystalline PVD γ‐Al2O3‐ coatings offer great potential for their use in high‐speed cutting operations. They promise high hot hardness and high oxidation resistance at elevated temperatures. This is important for coatings that are used for machining of materials with low thermal conductivity such as stainless steel or Inconel 718 because heat generated during cutting can barely be dissipated by the chip. Because of the prevailing bonding forces of alumina, adhesion‐related sticking can be reduced even for dry cutting. Furthermore, the high formation enthalpy of alumina prevents chemical reactions with frictional partners. The present work gives an overview of the deposition of γ‐Al2O3 thin films on WC/Co‐cutting inserts by using pulsed MSIP (magnetron sputter ion plating) PVD technology. To improve adhesion, a (Ti,Al)N bond coat was employed. The samples were analyzed using common thin film test equipment. Cutting tests and pin‐on‐disk examinations were carried out to test the coating's performance. For turning operations, the difficult‐to‐machine austenitic steel 1.4301 (X5CrNi18‐10) was used. In comparison to a state‐of‐the‐art (Ti,Al)N coating, (Ti,Al)N/γ‐Al2O3 showed a longer tool life.
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