Defect and abrasion resistant surface coating and cutting tool

Abstract

The invention provides a defect and abrasion resistant surface coating and cutting tool. The surface of a body of the tool is coated with a hard coating layer via the physical evaporation. The hard coating layer is composed of a composite arbonitride layer or a nitride layer which is represented by the formula (Al1-x-y CrxSiy)(N1-zCz) and has the average thickness of 0.5 to 8.0[mu]m. The hard coating layer includes metal particles, and above 90 atom % of the elements of the metal particle are metal elements, and the cross section long diameter is from 0.05 to 1.0[mu]m. The metal particles are arranged in the hard coating layer at 3 to 20% of the longitudinal section area rate. In the metal particles, when the elements includes Al of above 50 atom%, and the aspect ratio of the longitudinal section is above 2.0, the cross long diameter form an 45 degree included angle with the surface of the substrate, the longitudinal section ratio is A%, and when the longitudinal section ratio is B%, 0.3<=A / (A+B).

Description

technical field [0001] The present invention relates to a surface coating that exhibits excellent wear resistance during long-term use by improving the chipping resistance of a hard coating layer, for example, in face milling of workpieces such as carbon steel and alloy tool steel. Covered cutting tools (hereinafter referred to as covered tools). Background technique [0002] Conventionally, in a surface-coated cutting tool as disclosed in Patent Document 1, for example, it is known that crystal grains of a compound in which crystals grow from droplets of a hard coating protrude from the surface of the coating. When the length in the longitudinal direction of the crystal grain is h (μm) and the film thickness of the hard film is T (μm), by setting 6≤T≤30 and 0.1≤h / T≤1.2, the droplet Large columnar crystals are grown as the starting point, and compressive stress is reduced to achieve a thicker film without compromising adhesion. [0003] In addition, as disclosed in Patent ...

AI Technical Summary

Problems solved by technology

Spherical particles, or particles that are vertically elongated in the film thickness direction among slender particles, are easy to fall off due to resistance during cutting, and cause greater damage to the film surface when falling off, increasing the surface roughness so that Problems that lead to a decrease in chip resistance

Therefore, when only metal particles are simply dispersed in the hard coating layer, for example, in the case of processing workpieces such as carbon steel and alloy tool steel by processing methods such as face milling that require both wear resistance and chipping resistance, The hard coating is prone to chipping, and as a result, the current situation is that the service life is reached in a relatively short period of time

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