Coated cutting tool with substrate, metal nitride underlayer(s), and a single-phase B1 cubic Cr1-xAlN (0.75≤x≤0.85) uppermost layer for enhanced performance.

Patentradars sammanfattning

AB Sandvik Coromant discloses a coated cutting tool comprising a substrate body topped with a multilayer PVD coating. The coating architecture consists of one or more metal nitride (M) layers totaling 0.5–8 µm thickness, followed by an uppermost Cr1-xAlN layer (0.75≤x≤0.85) of 0.1–2 µm that adopts a single-phase B1 cubic crystal structure. The high aluminium content in the uppermost CrAlN layer, stabilised in the metastable cubic phase, is intended to deliver superior hardness, oxidation resistance, and wear performance in cutting applications. A corresponding deposition method, likely cathodic arc or magnetron sputtering PVD, is also claimed.

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