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TiN/(TiN+CrN)/CrAlN nano composite coating and preparation method thereof

A nano-composite coating and nano-composite technology, applied in coatings, metal material coating processes, layered products, etc. Abrasion and other issues, to achieve excellent bonding properties, improve impact resistance, and avoid cracking

Inactive Publication Date: 2013-07-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using a single magnetron sputtering technology, due to the low degree of ionization of metal particles, it is difficult to greatly improve the bonding strength between the coating and the substrate.
In addition, the thicker and lower hardness CrN inner layer (about 12GPa) will affect the hardness of the entire coating and damage the wear resistance of the coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The surface treatment of embodiment 1 cemented carbide rail processing blade

[0026] A preparation method of TiN / (TiN+CrN) / CrAlN nanocomposite coating comprises the following steps and process conditions:

[0027] (1) Pretreatment of the surface of the hard alloy steel rail processing knife: put the blade in the "Qiangli" brand alkaline metal cleaning solution and boil for 40 minutes to degrease the surface; at room temperature, place the blade in ultrasonic cleaning filled with alkaline metal cleaning solution Ultrasonic treatment in a machine (frequency 40kHz) for 10 minutes; put the cleaned blade into pure ethanol solution for dehydration, and then place it in an oven at 120°C for 60 minutes.

[0028](2) Preheating of carbide rail processing blades: put the pretreated blades into the BD 802088BE vacuum coating furnace produced by Balzers, and vacuumize to 5x10 -3 After Pa, pass Ar gas to maintain a vacuum of 2.3x10 -1 Pa, start the HCD electron gun and the auxilia...

Embodiment 2

[0034] Example 2 Surface Treatment of Cold Work Die Steel SKD1 Alloy Substrate

[0035] The experimental SKD1 brand alloy (the Rockwell hardness after quenching + tempering treatment is HRC63) was cut into a rectangular sample of 10x10x20 (mm), and one side was ground and polished to coat TiN / (TiN+CrN) / CrAlN nano Test related properties after composite coating.

[0036] (1) Surface pretreatment of SKD1 alloy samples: put the sample in "Qiangli brand" alkaline metal cleaning solution and boil for 10 minutes to degrease the surface; at room temperature, place the sample in an ultrasonic cleaning machine filled with alkaline metal cleaning solution (frequency 40 kHz) for 8 minutes; put the cleaned blade into pure ethanol solution for dehydration, and then place it in an oven at 120° C. for 30 minutes.

[0037] (2) SKD1 alloy sample preheating: put the pretreated sample into the BD 802088BE vacuum coating furnace produced by Balzers, and vacuumize to 5x10 -3 After Pa, pass Ar ga...

Embodiment 3

[0043] Embodiment 3 high-speed steel (SKH51) milling cutter and test piece surface coating treatment

[0044] The material grade of the milling cutter is SKH51. During the surface treatment, a 10x10x20 (mm) rectangular sample with the same heat treatment system (the Rockwell hardness is HRC65 after quenching + tempering treatment) is placed in the furnace, and one side of the sample is ground and polished. , in order to test the relevant properties after coating TiN / (TiN+CrN) / CrAlN nanocomposite coating.

[0045] (1) Surface pretreatment of workpieces and samples: put the workpieces and samples to be treated in "Qiangli brand" alkaline metal cleaning solution and boil for 120 minutes to degrease the surface (the oil stain on the surface of the milling cutter is serious); place the workpieces and samples at room temperature Ultrasonic in an ultrasonic cleaning machine (frequency 40kHz) filled with alkaline metal cleaning solution for 15 minutes; put the cleaned workpieces and s...

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Abstract

The invention discloses a TiN / (TiN+CrN) / CrAlN nano composite coating and a preparation method thereof. The nano composite multilayer coating is a multilayer metal nitride ceramic coating which has a TiN / (TiN+CrN) / CrAlN structure and is formed sequentially by a transitional layer TIN membrane, a (TiN+CrN) nano composite multilayer and a CrAlN nano composite multilayer on a tool or mold matrix madeof hard alloy, high-speed steel and heat-resistance mold steel. The preparation method comprises preheating, surface cleaning and etching, the preparation of the transitional layer, the preparation of the (TiN+CrN) nano composite multilayer, the preparation of the CrAlN nano composite multilayer and other steps. In the invention, with a proper coating structural design, the bonding force of CrAlNcoatings with the matrix is improved and the high hardness and high-temperature performance of the CrAlN coatings are retained.

Description

technical field [0001] The invention relates to a nanocomposite coating for tools and molds, in particular to a TiN / (TiN+CrN) / CrAlN nanocomposite coating and a preparation method thereof. Background technique [0002] In the past 20 years, the application of physical vapor deposition (PVD) to prepare advanced hard coatings on the surface of tools and molds has received widespread attention. Not only TiAlN, AlTiN, AlCrN, TiSiN, Al 2 o 3 and other wear-resistant coatings, as well as MoS 2 , DLC, WC / C and other lubricating coatings, as well as new coating structures such as gradient coatings and nanocomposite coatings, greatly improve the performance of the coating. Composite multi-layer films and nano-composite multi-layer films have become an important direction for the development of superhard coating technology. These coatings are not only used in the field of cutting tools, but also to a certain extent in the mold industry. The hardness of the coating, high temperatur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B9/04C23C14/02C23C14/32C23C14/06
Inventor 彭继华
Owner SOUTH CHINA UNIV OF TECH
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