Ceramic reinforced graphite self-lubricating coating on titanium alloy surface and preparation method thereof

A self-lubricating coating, titanium alloy technology, applied in the direction of metal material coating process, coating, etc., can solve the problems of high friction coefficient, low hardness of titanium alloy, self-lubricating performance of segregation coating, etc.

Active Publication Date: 2022-06-07
CIVIL AVIATION UNIV OF CHINA
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems of low hardness and large friction coefficient of titanium alloy and the defects in the prior art, the invention provides a ceramic-reinforced graphite self-lubricating coating on the surface of titanium alloy and a preparation method thereof
The present invention uses TC4+Ni60+nickel-coated graphite as the cladding material, adopts coaxial powder feeding laser cladding technology to prepare a self-lubricating wear-resistant coating containing "graphite-TiC" composite structural phase on the surface of titanium alloy, and the method solves the problem of The self-lubricating performance of the coating is affected by the serious segregation of the coating structure due to the difference in mass density and unclear interface relationship between the lubricating phase and the reinforcing phase in the coating, and the process is simple, pollution-free and efficient , suitable for industrial production

Method used

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  • Ceramic reinforced graphite self-lubricating coating on titanium alloy surface and preparation method thereof
  • Ceramic reinforced graphite self-lubricating coating on titanium alloy surface and preparation method thereof
  • Ceramic reinforced graphite self-lubricating coating on titanium alloy surface and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0042] In this embodiment, a TruDisk4002 fiber laser is used to prepare a ceramic-enhanced graphite self-lubricating coating on the surface of a Ti-6Al-4V titanium alloy with a size of 60mm×40mm×10mm. The preparation method includes the following steps:

[0043] S1. Pretreatment of the surface of the titanium alloy substrate to be clad: sandblast the surface of the TC4 alloy to be clad to remove the oxide film and oil stains on the surface of the titanium alloy, and place the sandblasted substrate in anhydrous ethanol for ultrasonic cleaning for 15 minutes , after cleaning, put it in a vacuum drying box for use;

[0044] S2. Preparation and pretreatment of cladding materials: The cladding materials are prepared in proportion and placed in a planetary ball mill for ball milling for 12 hours, and the ball-milled cladding powder is placed in a vacuum drying box with a temperature of 80°C for constant temperature drying for 10 hours;

[0045] In this embodiment, the cladding mater...

Embodiment 2

[0050] In this example, a TruDisk4002 fiber laser is used to prepare a ceramic-enhanced graphite self-lubricating coating on the surface of a Ti-6Al-4V titanium alloy with a size of 60mm×40mm×10mm. The differences from Example 1 are:

[0051] The cladding material adopts 30wt% TC4 powder with a particle size of 45-105 μm, 35wt% Ni60 powder with a particle size of 40-100 μm and 35wt% nickel-coated graphite powder with a particle size of 30-100 μm, and the graphite content in the nickel-coated graphite powder is 25wt %.

[0052] figure 2 (b) The macroscopic morphology photo of the coating cross-section of this example, it can be seen that the coating structure is uniform and dense, and the forming quality is good. increased. The average microhardness of the coating is 695HV 0.5 , which is lower than that of Example 1, but its friction coefficient (0.09) is significantly lower than that of Example 1 (0.41) (see Figure 5 ). Graphite is a soft lamellar structure, and it is e...

Embodiment 3

[0054] In this example, a TruDisk4002 fiber laser is used to prepare a ceramic-enhanced graphite self-lubricating coating on the surface of a Ti-6Al-4V titanium alloy with a size of 60mm×40mm×10mm. The differences from Example 1 are:

[0055] The cladding material adopts 30wt% TC4 powder with a particle size of 45-105μm, 25wt% Ni60 powder with a particle size of 40-100μm and 45wt% nickel-coated graphite powder with a particle size of 30-100μm, and the graphite content in the nickel-coated graphite powder is 25wt %.

[0056] figure 2 (c) The photo of the macroscopic morphology of the cross-section of the coating of this example, it can be seen that the coating structure is uniform and dense, and the forming quality is good. 1 increased significantly. The average microhardness of the coating is 681HV 0.5 , the friction coefficient with WC on the grinding ball is 0.1 (see Figure 5 ), the coating has good friction and wear properties.

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Abstract

The invention belongs to the field of titanium alloy surface engineering, in particular to a titanium alloy surface ceramic reinforced graphite self-lubricating coating and a preparation method thereof. The lubricating coating is a cladding material composed of 30wt% TC4 powder, 25-45wt% Ni60 powder and 25-45wt% nickel-coated graphite powder, which is produced by coaxial powder feeding laser cladding technology on the surface of the treated titanium alloy substrate. have to. The invention can prepare a ceramic reinforced graphite self-lubricating coating with good self-lubricating effect on the surface of the titanium alloy, which can improve the friction and wear performance of the titanium alloy surface, increase the service period of the titanium alloy parts, and solve the problem of lubricating phase and reinforcement in the coating. Due to the difference in mass density and unclear interface relationship, the serious segregation of the coating structure will affect the self-lubricating performance of the coating, and the method has a simple process, no pollution and high efficiency, and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of titanium alloy surface engineering, in particular to a ceramic-reinforced graphite self-lubricating coating on the titanium alloy surface and a preparation method thereof. Background technique [0002] Titanium alloys have many excellent properties such as low density, high specific strength, corrosion resistance, fatigue resistance, and good welding and casting properties. , energy power, biomedicine and other national economic fields are widely used. However, titanium alloys have inherent defects such as low hardness, large friction coefficient, poor wear resistance, and easy to produce adhesive wear, which seriously limit the service life and application scope of titanium alloys as moving parts of friction pairs. Since the failure behaviors such as friction and wear and fretting damage of titanium alloy parts originate from the surface of the parts, advanced surface modification technology is used to prepare a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10C22C14/00C22C19/05
CPCC23C24/103C22C14/00C22C19/056
Inventor 张天刚姚波张志强柏明磊肖海强杨凡徐誉桐
Owner CIVIL AVIATION UNIV OF CHINA
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