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CrN-Cr gradient coating on 45 steel surface and preparation method and application of CrN-Cr gradient coating

A gradient coating, crn-cr technology, applied in the coating, metal material coating process, ion implantation plating, etc., can solve the problems of poor bonding force of the film base, insufficient wear resistance, etc., to protect the base material, Combining good effects with performance

Pending Publication Date: 2021-10-19
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problems of insufficient wear resistance of 45 steel substrate and poor binding force of traditional hard coating film base, and provides a CrN-Cr gradient coating on the surface of 45 steel and its preparation method and application; that is, it is prepared on the surface of 45 steel CrN-Cr gradient coating, while improving the wear resistance of the substrate surface, also enables the modified layer to have a good bonding ability with the substrate, avoiding damage and failure caused by the property mutation between the coating and the substrate, thereby protecting the substrate, The effect of prolonging the life of the substrate

Method used

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  • CrN-Cr gradient coating on 45 steel surface and preparation method and application of CrN-Cr gradient coating
  • CrN-Cr gradient coating on 45 steel surface and preparation method and application of CrN-Cr gradient coating
  • CrN-Cr gradient coating on 45 steel surface and preparation method and application of CrN-Cr gradient coating

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Effect test

Embodiment 1

[0033] Such as figure 1 As shown in (a), a CrN-Cr gradient coating on the surface of 45 steel is prepared on the surface of 45 steel substrate by double glow plasma surface technology. The surface of the coating is a CrN layer with a thickness of 7 μm; the inside of the coating is Cr and N diffusion layer with a thickness of 20 μm.

[0034] The preparation method of the above-mentioned 45 steel surface CrN-Cr gradient coating comprises the steps:

[0035] Step 1, substrate material pretreatment

[0036] Prepare 45 steel, use different types of sandpaper to grind the base sample step by step, mechanically polish it into a smooth mirror surface, and finally put it into a beaker containing absolute ethanol for ultrasonic cleaning, and use 180#, 500#, 1500# #, 2000# type sandpaper to grind the matrix sample step by step;

[0037] Step 2, cleaning and placing the workpiece

[0038] Polish the inner wall of the vacuum furnace and the surface of the target to remove the surface o...

Embodiment 2

[0051] Such as figure 1 As shown in (b), a CrN / Cr gradient coating on the surface of 45 steel is prepared on the surface of 45 steel by double glow plasma surface technology. The surface of the coating is a CrN deposition layer with a thickness of 6 μm; the inside of the coating is Cr and N diffusion layer with a thickness of 15 μm.

[0052] The preparation method of the above-mentioned 45 steel surface CrN-Cr gradient coating comprises the steps:

[0053] Step 1, substrate material pretreatment

[0054] Prepare 45 steel, use different types of sandpaper to grind the base sample step by step, mechanically polish it into a smooth mirror surface, and finally put it into a beaker containing absolute ethanol for ultrasonic cleaning, and use 180#, 500#, 1500# #, 2000# type sandpaper to grind the matrix sample step by step;

[0055] Step 2, cleaning and placing the workpiece

[0056] Polish the inner wall of the vacuum furnace and the surface of the target to remove the surface ...

Embodiment 3

[0069] Such as figure 1 As shown in (c), a CrN / Cr gradient coating on the surface of 45 steel is prepared on the surface of 45 steel by double glow plasma surface technology. The surface of the coating is a CrN deposition layer with a thickness of 7 μm; the inside of the coating is Cr and N diffusion layer with a thickness of 14 μm.

[0070] A kind of preparation method of CrN / Cr gradient coating on 45 steel surface, comprises the steps:

[0071] Step 1, substrate material pretreatment

[0072] Prepare 45 steel, use different types of sandpaper to grind the base sample step by step, mechanically polish it into a smooth mirror surface, and finally put it into a beaker containing absolute ethanol for ultrasonic cleaning, and use 180#, 500#, 1500# #, 2000# type sandpaper to grind the matrix sample step by step;

[0073] Step 2, cleaning and placing the workpiece

[0074] Polish the inner wall of the vacuum furnace and the surface of the target to remove the surface oxide film...

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Abstract

The invention discloses a CrN-Cr gradient coating on 45 steel surface and a preparation method and application of the CrN-Cr gradient coating. The gradient coating deposited on the 45 steel surface is obtained through a double glow plasma surface technology, and the CrN / Cr gradient coating comprises a Fe, Cr and N diffusion layer close to the side of a substrate and an outer CrN layer; the thickness of the diffusion layer is 10-20 microns, Fe, Cr and N elements in the diffusion layer are diffused, the Fe element is diffused from the substrate to the coating, and the Cr and N elements are diffused from the coating to the substrate; and the thickness of the CrN layer is 5-20 microns, the N element diffuses from the coating to the substrate, and the content of the N element is gradually reduced. The CrN / Cr gradient coating has good binding force with the 45 steel substrate, and reduces damage and failure caused by property difference between coating substrates, so that the effects of protecting the substrates and prolonging the service life are achieved, and the CrN / Cr gradient coating is suitable for connecting rods, gears, shafts or other steel parts which are likely to generate frictional wear.

Description

technical field [0001] The invention belongs to the field of 45 steel surface treatment, and in particular relates to a CrN-Cr gradient coating on the surface of 45 steel, a preparation method and application thereof. Background technique [0002] 45 steel is a medium-carbon high-quality structural steel widely used in engineering. After quenching and tempering, it is often used to manufacture transmission parts with high strength requirements such as connecting rods, gears, and shafts. However, complex and harsh working conditions will cause severe wear on the surface of 45 steel. With the development of modern industry, the contradiction between the continuous improvement of equipment requirements and the insufficient surface performance of parts has gradually emerged. Under the conditions of high speed, high temperature, high pressure, heavy load, and corrosive media, the damage of parts and materials often starts from the surface, such as wear, corrosion, high temperatu...

Claims

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Application Information

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IPC IPC(8): C23C14/38C23C14/16C23C14/06
CPCC23C14/34C23C14/0036C23C14/16C23C14/0641
Inventor 梁文萍亓艳林浩缪强易锦伟史伟伟马海瑞
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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