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Titanium-aluminum alloy member having composite infiltration layer, and preparation method thereof, and titanium-aluminum alloy member having diamond coating, and preparation method thereof

A technology of diamond coating and titanium-aluminum alloy, which is applied in the direction of metal material coating process, coating, superimposed layer plating, etc., can solve the problem of large difference in thermal expansion coefficient, cracks in titanium-aluminum alloy and diamond film, and diamond film peeling off and other problems, to achieve the effect of improving toughness and hardness, increasing service life, and improving resistance to wear

Pending Publication Date: 2019-02-26
SHENZHEN INST OF ADVANCED TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the thermal expansion coefficients of titanium-aluminum alloy and diamond film are quite different. After the diamond film is deposited on the surface of titanium-aluminum alloy, in the process of cooling, thermal stress will be generated due to the large difference in thermal expansion coefficient, which will lead to the gap between the diamond film and the substrate. Adhesion is poor, cracks are formed between the titanium-aluminum alloy and the diamond film, and the diamond film may even fall off in places where the stress is concentrated
[0004] In the prior art (CN104760349A), there is a method for adopting glow ion infiltration to prepare high-temperature oxidation-resistant and heat-resistant corrosion-resistant Al-Cr coatings on the surface of titanium-aluminum alloys. Firstly, the preparation cost of Al-Cr coatings is relatively large, and secondly However, there is still a large gap between the thermal expansion coefficients of the prepared Al-Cr coating and the diamond film, which is not suitable for the intermediate layer between the diamond film and titanium-aluminum alloy.

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  • Titanium-aluminum alloy member having composite infiltration layer, and preparation method thereof, and titanium-aluminum alloy member having diamond coating, and preparation method thereof
  • Titanium-aluminum alloy member having composite infiltration layer, and preparation method thereof, and titanium-aluminum alloy member having diamond coating, and preparation method thereof
  • Titanium-aluminum alloy member having composite infiltration layer, and preparation method thereof, and titanium-aluminum alloy member having diamond coating, and preparation method thereof

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Embodiment 1

[0075] A method for preparing a titanium-aluminum alloy part with a composite coating, comprising the following steps:

[0076] Step 1: sequentially use 800#-1500# sandpaper (800 mesh, 1000 mesh, 1200 mesh and 1500 mesh) to polish the titanium-aluminum alloy substrate, and use deionized water to ultrasonically clean after polishing. Then use the corrosive solution to corrode the polished titanium-aluminum alloy substrate for 1 minute, wherein the corrosive solution is prepared with concentrated sulfuric acid and hydrogen peroxide in a volume ratio of 1:10, and then use deionized water to ultrasonically clean it for 10 minutes after corrosion. Minutes, the titanium-aluminum alloy sample after surface pretreatment was obtained.

[0077] Step 2: Composition according to weight percentage: 20% Si powder, 0.5% Zr 2 o 3 powder, 8% NaF powder, the rest is Al 2 o 3 Powder ratio to prepare osmosis agent, all reagents are analytically pure, of which Si powder and Zr 2 o 3 The part...

Embodiment 2

[0086] A method for preparing a titanium-aluminum alloy part with a diamond coating, comprising the following steps:

[0087] Step 1: Use 800#-1500# sandpaper to polish the titanium-aluminum alloy substrate in sequence, and use deionized water to clean it ultrasonically after grinding. Then use the corrosive solution to corrode the polished titanium-aluminum alloy substrate for 30 seconds, wherein the corrosive solution is prepared with concentrated sulfuric acid and hydrogen peroxide according to the volume ratio of 1:10, and then use deionized water to ultrasonically clean it for 10 seconds. Minutes, the titanium-aluminum alloy sample after surface pretreatment was obtained.

[0088] Step 2: Composition according to weight percentage: 15% Si powder, 1% Zr 2 o 3 powder, 8% NaF powder, the rest is Al 2 o 3 The ratio of the powder to prepare the penetrating agent, all reagents are analytically pure, wherein the particle size of Si powder and yttrium oxide is less than or eq...

Embodiment 3

[0097] A method for preparing a titanium-aluminum alloy part with a diamond coating, comprising the following steps:

[0098] Step 1: Use 800#-1500# sandpaper to polish the titanium-aluminum alloy substrate in sequence, and use deionized water to clean it ultrasonically after grinding. Then use the corrosion solution to corrode the polished titanium-aluminum alloy substrate for 2 minutes, wherein the corrosion solution is prepared with concentrated sulfuric acid and hydrogen peroxide according to the volume ratio of 1:10, and use deionized water to ultrasonically clean it for 10 minutes after corrosion. Minutes, the titanium-aluminum alloy sample after surface pretreatment was obtained.

[0099] Step 2: Composition according to weight percentage: 10% Si powder, 3% Zr 2 o 3 powder, 5% NaF powder, the rest is Al 2 o 3 Powder ratio to prepare osmosis agent, all reagents are analytically pure, of which Si powder and Zr 2 o 3 The particle size of the powder is less than or eq...

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Abstract

The present invention provides a titanium-aluminum alloy member having a composite infiltration layer, wherein the titanium-aluminum alloy member comprises a titanium-aluminum alloy matrix and a composite infiltration layer arranged on the titanium-aluminum alloy matrix, the composite infiltration layer comprises a TiAl2 layer, a zirconium-doped Ti5Si4 layer and a zirconium-doped TiSi2 layer, theTiAl2 layer, the zirconium-doped Ti5Si4 layer and the zirconium-doped TiSi2 layer are sequentially stacked, and the thermal expansion coefficient of the composite infiltration layer is gradually decreased from the titanium-aluminum alloy matrix to the composite infiltration layer along a thickness direction. According to the present invention, during the subsequent preparation of a diamond coatingbased on the composite infiltration layer, the composite infiltration layer can improve the adhesion between the diamond coating and the titanium-aluminum alloy matrix, such that the wear intoleranceof the titanium-aluminum alloy can be improved, and the service life of the diamond coating on the titanium-aluminum alloy member can be prolonged. The invention further provides a preparation methodand applications of the titanium-aluminum alloy member having the composite infiltration layer.

Description

technical field [0001] The invention relates to the technical field of surface modification of metal materials, in particular to a titanium-aluminum alloy part with a composite coating and a preparation method thereof, a titanium-aluminum alloy part with a diamond coating and a preparation method thereof. Background technique [0002] Titanium-aluminum alloy has the advantages of low density, high specific strength and specific stiffness, and good high-temperature creep performance. It is considered to be one of the new lightweight engineering structural materials with great application prospects. However, it has a high coefficient of friction and poor wear resistance, and it is easy to wear during actual use, thereby reducing its service life. Fretting damage such as friction and wear has become one of the main bottlenecks limiting the wide application of titanium-aluminum alloys. [0003] At present, diamond films are often used to prepare wear-resistant coatings because ...

Claims

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Application Information

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IPC IPC(8): C23C10/52C23C10/02C23C28/00
CPCC23C10/02C23C10/52C23C28/34
Inventor 唐永炳黄磊王陶
Owner SHENZHEN INST OF ADVANCED TECH
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