Ngk Spark Plug Company, Limited

Shota Nozaki

Atsushi Komura

Ryoji Toyoda

Fumihiro Kikkawa

A surface-coated cutting tool including a tool substrate containing WC crystal grains and insulating grains, and a coating layer composed of a multiple nitride of Ti, Al, and V and disposed on the surface of the tool substrate. The multiple nitride is represented by a compositional formula: TiAlVN satisfying the following relations:0.25&#x2264;0.35,0.64&#x2264;0.74,0&#x3c;&#x2264;0.06, and1wherein each of a, b, and c represents an atomic proportion. The coating layer is characterized by exhibiting a peak attributed to a hexagonal crystal phase and a peak attributed to a cubic crystal phase as observed through X-ray diffractometry.

Surface-coated cutting tool

To improve the adhesion resistance and wear resistance of a surface-coated cutting tool. The surface-coated cutting tool includes a tool substrate, and a single-component coating layer composed of a composite nitride of Cr (chromium), Al (aluminum), and V (vanadium) and disposed on the surface of the tool substrate. The composite nitride is characterized by being represented by a compositional formula: CrAlVN satisfying the following relations:0.11&#x2264;&#x2264;0.26;0.73&#x2264;&#x2264;0.85;0&#x3c;&#x2264;0.04; and&#x2264;1(wherein a, b, and c each represent an atomic proportion). The single-component coating layer has both a hexagonal phase and a cubic phase.

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Nagoya, Japan

Shota Nozaki