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Method for improving bonding strength of interface between hard coating and substrate

A technology of interfacial bonding strength and hard coating, applied in coating, metal material coating process, ion implantation plating, etc., can solve the problems of coating and substrate performance deterioration, etc.

Inactive Publication Date: 2012-06-27
SOUTHWEST UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the purpose of the present invention is to provide a kind of method that improves hard coating (thin film) and substrate interfacial bonding strength, so that it can solve coating and when eliminating hard coating / substrate interior and interfacial stress by high temperature annealing The problem of performance degradation of the substrate at high temperatures, while improving the bonding strength of the coating / substrate interface at lower temperatures, maintain or improve the comprehensive mechanical properties or mechanical properties of the coating / matrix composite system

Method used

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  • Method for improving bonding strength of interface between hard coating and substrate
  • Method for improving bonding strength of interface between hard coating and substrate

Examples

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Effect test

Embodiment 1

[0023] A 3 μm thick TiN coating was deposited on the YW2 cemented carbide substrate by arc ion coating technology. After 30 hours of ultra-low temperature treatment in liquid nitrogen at -196 ° C, a Rockwell indentation test was carried out on it. The indentation appearance is as follows figure 1 As shown: a) and b) are respectively the microscopic photos of the Rockwell indentation morphology before and after ultra-low temperature treatment. The level of adhesion of the layers is significantly improved. At the same time, the quantitative detection of the scratch test showed that the adhesion before treatment was 55N, and it rose to 83N after treatment, and the adhesion increased by 51%.

[0024] figure 2 It is the Vickers hardness of coated cemented carbide before and after ultra-low temperature treatment under the same conditions. Gray and red represent the hardness values ​​before and after treatment respectively. improve. Since the test results of the microhardness tes...

Embodiment 2

[0026] A 3 μm thick TiN coating was deposited on the polished 304 stainless steel substrate by arc ion plating technology. After 30 hours of ultra-low temperature treatment in liquid nitrogen at -196 ° C, a scratch test was carried out on it. The appearance of the scratch is as follows: image 3 Shown: a) and b) are the microscopic images of the scratch morphology before and after ultra-low temperature treatment, respectively. It can be seen that the TiN peeling off at the edge and central part of the scratch is serious before ultra-low temperature treatment, and the coating is lumpy after ultra-low temperature treatment. The shedding situation was obviously alleviated, and the coating on the edge and middle of the scratch did not completely fall off after the scratch was completed, and the coating that had not been treated basically fell off completely. This indicates that the interfacial bonding strength of TiN coating / stainless steel substrate has been significantly improved...

Embodiment 3

[0029] A 3μm-thick CrN coating was deposited on the YW2 cemented carbide substrate by arc ion coating technology. After 5 hours of ultra-low temperature treatment at -273°C in liquid helium, the scratch quantitative detection test was carried out. The test results show that after ultra-low temperature treatment The adhesion level of the CrN coating after treatment was significantly improved, the adhesion before treatment was 58N, and it rose to 72N after treatment, and the adhesion increased by 24%.

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Abstract

The invention discloses a method for improving the bonding strength of an interface between a hard coating and a substrate. The method is implemented by treating the hard coating / substrate compound system at the low temperature or ultralow temperature of between 50 DEG C and 273 DEG C below zero for 5-48 hours. The hard coating comprises nitride coatings such as TiN, CrN, TiAlN, TiSiN, CrAlTiN, BN and the like, C coatings such as diamond, diamond-like carbon and the like, and carbide coatings such as TiC, WC and the like. Due to the adoption of the method, the bonding strength of the interface between the coating and the substrate can be raised by 10-50 percent, and deterioration of the performance of the substrate or coating can be avoided by adopting of the conventional high-temperature annealing method; and meanwhile, low-temperature or ultralow-temperature treatment cost is low, and the method is suitable for various coatings / substrate compound systems.

Description

technical field [0001] The invention relates to the technical field of chemical engineering, in particular to a method for improving the bonding strength of a hard coating on the surface of friction pair parts such as cutters, molds and mechanical parts, and a substrate interface. Background technique [0002] The bonding strength between the solid coating material and the substrate is the key factor that determines whether the coating can perform its various functions. How to improve the bonding strength of the film substrate has always been a hot research topic in the field of functional coating (thin film) materials. The usual composite system composed of the coating and the substrate is a heterogeneous system. The differences in the composition, structure, physical and chemical properties of the coating and the substrate will inevitably lead to mismatching at the interface and the generation of interfacial stress. There will also be sufficient internal stress remaining i...

Claims

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Application Information

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IPC IPC(8): C23C4/18C23C14/58
Inventor 聂朝胤张碧云谢红梅贾晓芳刘晓魁林华
Owner SOUTHWEST UNIVERSITY
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