Multi-layer coating system deposited on surface of substrate and preparation method of multi-layer coating system

Abstract

The invention provides a multi-layer coating system deposited on the surface of a matrix and a preparation method thereof, the multi-layer coating system comprises a multi-layer coating, and the multi-layer coating is formed by alternately depositing a first coating and a second coating; the first coating is a titanium-aluminum nitride (c-Ti1-xAlxN) with a face-centered cubic structure and with (200) crystal face preferred orientation growth, the second coating is a titanium-niobium nitride (c-Ti1-aNbaN) with a face-centered cubic structure and with (200) crystal face preferred orientation growth, and a coherent growth interface is formed between the first coating and the second coating. The invention aims to provide a multi-layer coating system with c-Ti < 1-a > NNb N/c-Ti < 1-a > NNb N and a preparation method of the multi-layer coating system. The coating system is higher in hardness, wear resistance and adhesion resistance and higher in high-temperature oxidation resistance and bonding strength.

Description

technical field [0001] The invention belongs to the technical field of surface protective coatings, in particular to a multilayer coating system deposited on the surface of a substrate and a preparation method thereof. Background technique [0002] Pure iron has low hardness, high plasticity and toughness, large deformation, difficult chip breaking, easy chip sticking, rough machined surface, and poor processability. Although the strength and hardness of austenitic stainless steel are not high, it has severe work hardening, low thermal conductivity, good plasticity and toughness, is not easy to break chips, and has poor cutting performance. The difficult-to-machine characteristics of nickel-based superalloys are mainly manifested in problems such as large cutting force, high cutting temperature, poor thermal conductivity, high temperature hardness of the material, and many metal compounds and hard spots in the material. Due to the processing of pure iron, austenitic stainle...

AI Technical Summary

Problems solved by technology

The NbN coating prepared by the PVD method has good anti-sticking properties when cutting pure iron, austenitic stainless steel, and nickel-based superalloys, but the NbN coating usually has high hardness and large residual stress, and it is directly deposited on c- Ti 1-x al x The bonding strength of N-coated surface tends to be low, and it is easy to peel off

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