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Nickel base self-lubricating coating on surface of titanium alloy by laser cladding and preparation method thereof

A technology of self-lubricating coating and lubricating coating, applied in metal material coating process, coating and other directions, can solve the problem that the proportion and distribution of lubricating phase and reinforcing phase are easily affected by external factors, and the self-lubricating and wear-resistant performance of coating cannot be Fully reflect and prepare nickel-based self-lubricating coatings, etc., to achieve the effect of easy automatic control, ideal engineering application value, and precise control of coating thickness

Inactive Publication Date: 2018-08-17
SHANGHAI UNIV OF ENG SCI
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

At present, the following patents have been formed around the preparation of self-lubricating coatings by laser cladding technology: Chinese patent application number 201410363359.5 discloses a self-lubricating and wear-resistant composite coating for titanium alloy surfaces and its preparation method. The friction and wear of the coating itself and its counter parts can significantly improve the high-temperature wear life of titanium alloys, but it cannot guarantee that the coating has a low friction coefficient
The Chinese patent with application number 201410680470.7 discloses a method of in-situ self-generated wear-resistant and self-lubricating composite material coatings on the surface of titanium alloys by laser cladding technology. The titanium carbide and aluminum-titanium carbides in the coating are all in-situ. , to avoid the pollution problem of external reinforcing particles and the interface reaction between reinforcing particles and the matrix, but the reinforcing phase and lubricating phase of the coating are formed in situ, and the ratio and distribution of lubricating phase and reinforcing phase are easily affected by external factors , the self-lubricating and wear-resistant performance of the coating cannot be fully reflected
[0003] In the above prior art, the laser cladding process is used to treat the titanium alloy surface with a self-lubricating wear-resistant coating, and the problems of cracks and pores in the cladding layer are overcome by selecting appropriate cladding materials. Under the condition of lubricating medium, there is no guarantee that the coating has high wear resistance and low friction coefficient
Therefore, looking for a suitable self-lubricating composite material system and the preparation method of self-lubricating coating on titanium alloy surface through laser cladding process still need further research. At present, no laser cladding process has been used to prepare nickel-based self-lubricating coating on titanium alloy surface. related reports

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  • Nickel base self-lubricating coating on surface of titanium alloy by laser cladding and preparation method thereof
  • Nickel base self-lubricating coating on surface of titanium alloy by laser cladding and preparation method thereof
  • Nickel base self-lubricating coating on surface of titanium alloy by laser cladding and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] On the surface of Ti-6Al-4V titanium alloy plate of 50 (length) × 50 (width) × 5 (thickness) mm, Nd:YAG laser is used for laser cladding nickel-based self-lubricating composite coating, and the preparation method is carried out according to the following steps:

[0026] 1. Surface activation treatment of titanium alloy plate

[0027] Use 120# coarse sandpaper to grind and roughen the surface of the titanium alloy plate with a thickness of 5mm to remove the surface oxide layer and stains, strengthen the combination of the titanium alloy surface and the nickel-based self-lubricating composite cladding layer, and then clean it with alcohol or acetone. Let dry naturally.

[0028] 2. Prepare nickel-based composite coating precursor raw materials and prefabricate cladding powder layer

[0029] Prepare the nickel-based composite coating precursor by the following composition (mass percentage): 33.4wt.% nickel-based alloy, 33.3wt.% titanium nitride and 33.3wt.% nickel-coated m...

Embodiment 2

[0033] On the surface of Ti-6Al-4V titanium alloy plate of 50 (length) × 50 (width) × 5 (thickness) mm, Nd:YAG laser is used for laser cladding nickel-based self-lubricating composite coating, and the preparation method is carried out according to the following steps:

[0034] 1. Surface activation treatment of titanium alloy plate

[0035] Use 120# coarse sandpaper to grind and roughen the surface of the titanium alloy plate with a thickness of 5mm to remove the surface oxide layer and stains, strengthen the combination of the titanium alloy surface and the nickel-based self-lubricating composite cladding layer, and then clean it with alcohol or acetone. Let dry naturally.

[0036] 2. Prepare nickel-based composite coating precursor raw materials and prefabricate cladding powder layer

[0037]Prepare nickel-based composite coating precursor by following composition (mass percentage): 50wt.% nickel-based alloy, 25wt.% titanium nitride and 25wt.% nickel-clad molybdenum disulfi...

Embodiment 3

[0041] On the surface of Ti-6Al-4V titanium alloy plate of 50 (length) × 50 (width) × 5 (thickness) mm, Nd:YAG laser is used for laser cladding nickel-based self-lubricating composite coating, and the preparation method is carried out according to the following steps:

[0042] 1. Surface activation treatment of titanium alloy plate

[0043] Use 120# coarse sandpaper to grind and roughen the surface of the titanium alloy plate with a thickness of 5mm to remove the surface oxide layer and stains, strengthen the combination of the titanium alloy surface and the nickel-based self-lubricating composite cladding layer, and then clean it with alcohol or acetone. Let dry naturally.

[0044] 2. Prepare nickel-based composite coating precursor raw materials and prefabricate cladding powder layer

[0045] Prepare nickel-based composite coating precursor by following composition (mass percentage): 50wt.% nickel-based alloy, 20wt.% titanium nitride and 30wt.% nickel-clad molybdenum disulf...

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Abstract

The invention discloses a nickel base self-lubricating coating on the surface of a titanium alloy by laser cladding and a preparation method thereof. The preparation method comprises the steps that the surface of the titanium alloy is pretreated first; a raw material is prepared, wherein the raw material comprises, by weight, 45-55% of nickel base alloys, 20-30% of titanium and 20-30% of nickel-coated molybdenum disulfide, after uniform mixing, the raw material and a binder are mixed uniformly and are preset on the surface of the titanium alloy, and a binder preset powder layer is formed; anda nickel base self-lubricating composite coating is formed after powder is melted and solidified by laser irradiation. The obtained nickel base self-lubricating coating has good anti-friction and anti-friction lubrication action, and the using requirements of titanium alloy parts under harsh working conditions are met.

Description

technical field [0001] The invention belongs to the field of surface engineering, in particular to a nickel-based self-lubricating coating coated with laser cladding on the surface of a titanium alloy and a preparation method thereof. Background technique [0002] Titanium alloys have the advantages of low density, high specific strength, corrosion resistance, and good biocompatibility. They are often used as structural components in aerospace, petrochemical, and biomedical fields. application range. The use of surface modification technology can further enhance its hardness and anti-wear and anti-friction properties while maintaining the original advantages of titanium alloys. Among them, laser cladding is an advanced surface modification technology that uses high-energy laser beams to focus on extremely high-energy The feature is that the powder preset on the surface of the substrate or synchronized with the laser is completely melted instantly, and the substrate is parti...

Claims

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Application Information

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IPC IPC(8): C23C24/10C22C19/05C22C32/00
CPCC22C19/057C22C32/0047C23C24/103
Inventor 高秋实闫华秦阳陈正飞郭加龙
Owner SHANGHAI UNIV OF ENG SCI
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