A soft-hard composite nano-multilayer coating tool and its preparation method

Abstract

The invention provides a soft-hard composite nanometer multi-coating cutter and a preparation method thereof. The soft-hard composite nanometer multi-coating cutter is characterized in that a matrix material is hard alloy, and the coatings include a Zr transition layer, a (ZrN-CrCN)x periodic composite multilayer nano hard coating and a WS2 soft coating in sequence from bottom to top. In preparation of the coatings, only N2 is adopted as reaction gas, the other coating elements are solid targets respectively, so that the pollution in deposition of different coatings is effectively prevented. The WS2 soft coating has extremely-low shearing strength and friction coefficient, the (ZrN-CrCN)x periodic composite multilayer nano hard coating has extremely-high wear resistance, and as a transition layer, Zr is used for reducing residual heat stress between the coatings and the matrix, so that the bonding force between the coatings and the matrix is improved; the wear resistance of the cutteris greatly improved, and the cutting force and the cutting temperature of the cutter in cutting are reduced, so that the cutter can better adapt to severe cutting environment in cutting.

Description

Technical field

[0001] The invention belongs to the technical field of mechanical cutting tool manufacturing, and particularly relates to a novel soft and hard composite nano multilayer coating tool and a preparation method thereof. Background technique

[0002] The advantages of tool hard coating are high hardness and good wear resistance. According to the composition of the coating material, the coated tool can be divided into binary coating, ternary coating, and multi-element coating. Later, the structure of the coating has also changed, and gradient coatings, micro-coatings, and nano-coatings have appeared one after another. The coating has also developed from a single layer to later double-layer, multilayer, and nano-level multilayers, and the hardness and wear resistance of the coating have been continuously improved. Soft-coated tools have low shear strength, and the friction coefficient between the tool and the workpiece is low, but the soft-coated tools have poor wear r...

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