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TiAlN ultra-hard composite coating provided with hardness gradient layer for supporting and preparation method of TiAlN ultra-hard composite coating

A technology of hardness gradient and hard coating, applied in coating, superimposed layer plating, metal material coating process, etc., can solve the problems of insufficient bearing capacity, unreliable bonding force of hard film, poor temperature resistance, etc. , to achieve the effect of improving life expectancy

Pending Publication Date: 2018-04-20
NO 43 INST OF CHINA ELECTRONICS TECH GRP CETC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In response to the urgent need to improve the friction and wear resistance of the friction pair parts in the new generation of aero-engines and marine diesel engines under heavy load and high-speed working conditions, the organic combination of electron beam physical vapor deposition technology (EB-PVD) and plasma carbonitriding technology ( PNC), providing a TiAlN composite superhard coating supported by a hardness gradient layer, breaking through the technical bottlenecks of traditional PVD hard films such as unreliable bonding, high friction coefficient, poor temperature resistance and insufficient bearing capacity

Method used

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  • TiAlN ultra-hard composite coating provided with hardness gradient layer for supporting and preparation method of TiAlN ultra-hard composite coating
  • TiAlN ultra-hard composite coating provided with hardness gradient layer for supporting and preparation method of TiAlN ultra-hard composite coating
  • TiAlN ultra-hard composite coating provided with hardness gradient layer for supporting and preparation method of TiAlN ultra-hard composite coating

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Embodiment 1

[0033] like Figure 4As shown, a TiAlN composite superhard coating supported by a hardness gradient layer, the superhard coating is a three-layer structure consisting of a base material, an expansion layer and a deposition layer from bottom to top; the base material is 300M high-strength steel; the expansion layer is a plasma nitrocarburizing layer; the deposition layer is a nitrogen-aluminum-titanium coating 1.

[0034] The hardness of the plasma nitrocarburizing layer gradually increases from bottom to top.

[0035] The thickness of the plasma nitrocarburizing layer is 100 μm; the thickness of the titanium nitride aluminum coating is 3 μm.

[0036] A method for preparing a TiAlN composite superhard coating supported by a hardness gradient layer, the steps are as follows:

[0037] 1) The plasma nitrocarburizing layer was prepared on the upper surface of the 300M high-strength steel through the plasma nitrocarburizing technology enhanced by the hollow cathode effect and fiel...

Embodiment 2

[0045] like Figure 4 As shown, a TiAlN composite superhard coating supported by a hardness gradient layer, the superhard coating is a three-layer structure consisting of a base material, an expansion layer and a deposition layer from bottom to top; the base material is Nickel-based alloy; the expansion layer is a plasma nitrocarburizing layer; the deposition layer is a nitrogen-aluminum-titanium coating.

[0046] The hardness of the plasma nitrocarburizing layer gradually increases from bottom to top.

[0047] The thickness of the plasma nitrocarburizing layer is 200 μm; the thickness of the aluminum nitride titanium coating is 6 μm.

[0048] A method for preparing a TiAlN composite superhard coating supported by a hardness gradient layer, the steps are as follows:

[0049] 1) The plasma nitrocarburizing layer is prepared on the surface of the base material through the plasma nitrocarburizing technology enhanced by the hollow cathode effect and field discharge;

[0050] 2)...

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Abstract

The invention discloses a TiAlN ultra-hard composite coating provided with a hardness gradient layer for supporting and a preparation method of the TiAlN ultra-hard composite coating. The TiAlN ultra-hard composite coating provided with the hardness gradient layer for supporting sequentially comprises a matrix material, an expansion layer and a deposition layer from bottom to top. The matrix material is a conductive material. The expansion layer is a plasma nitrocarburizing layer. The deposition layer is a nitrogen-aluminum-titanium coating. Through a compact TiAlN ultra-hard film, the matrixmaterial has sufficient wear resistance. The plasma nitrocarburizing layer has a hardness gradient and thus can remarkably improve the capacity to support a hard and brittle surface layer, and the bearing capacity of the TiAlN ultra-hard film is effectively improved. In addition, the residual stress value of the surface of a part is increased through nitrogen and carbon, and the fatigue resistanceof the part is made higher. Furthermore, nitride and carbide of the nitrocarburizing layer are better matched with the TiAlN film in thermophysical performance, a film / matrix interface is better fused, and thus the film has higher and more reliable bonding force and also has better thermal fatigue resistance.

Description

technical field [0001] The invention relates to the technical field of composite superhard coatings, in particular to a TiAlN composite superhard coating supported by a hardness gradient layer and a preparation method thereof. Background technique [0002] With the continuous development of modern aviation technology, in order to improve the thrust-to-weight ratio of the engine, its working temperature is gradually increasing. At present, the outlet temperature of the compressor of the advanced military engine has reached 700 ℃, and the working temperature of the combustion chamber and afterburner is close to 2000 ℃. The turbine inlet temperature exceeds 1700°C. figure 1 is a graph of the evolution of the operating temperature of the aeroengine turbine blades. However, the performance and temperature of the base material used in the parts at the hot end of the engine are limited, and it is impossible to fully meet the requirements. In order to improve its life, reliability ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/30C23C14/06C23C14/02C23C8/36C23C8/38C23C8/30C23C8/32C23C28/04
CPCC23C8/36C23C8/38C23C14/024C23C14/0641C23C14/30C23C28/042
Inventor 聂丽丽
Owner NO 43 INST OF CHINA ELECTRONICS TECH GRP CETC
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