Self-lubricating wear-resistant composite coating for titanium alloy surface and preparation method of self-lubricating wear-resistant composite coating

A composite coating, self-lubricating technology, applied in the direction of metal material coating process, coating, etc., can solve the problems of surface hardness and wear resistance of single titanium alloy, unfavorable application of titanium alloy, no friction reduction, etc. Excellent anti-wear effect, cost-effective, reducing friction and wear

Active Publication Date: 2014-10-08
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

[0004] However, traditional composite coating materials only improve the hardness and wear resistance of the titanium alloy surface, but do not play a role in reducing friction (or c...

Method used

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  • Self-lubricating wear-resistant composite coating for titanium alloy surface and preparation method of self-lubricating wear-resistant composite coating
  • Self-lubricating wear-resistant composite coating for titanium alloy surface and preparation method of self-lubricating wear-resistant composite coating
  • Self-lubricating wear-resistant composite coating for titanium alloy surface and preparation method of self-lubricating wear-resistant composite coating

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preparation example Construction

[0056] Correspondingly, the application provides a method for preparing a self-lubricating and wear-resistant composite coating on the surface of a titanium alloy, comprising the following steps:

[0057] The mixed alloy powder and binder are mixed and coated on the surface of the titanium alloy to form a pre-paved coating. The mixed alloy powder includes:

[0058] 59wt% ~ 62wt% nickel;

[0059] 18.5wt% to 21wt% chromium;

[0060] 5wt%-8wt% boron;

[0061] 6.5 wt% to 10 wt% silicon; and

[0062] 3wt%~7wt% hexagonal boron nitride;

[0063] A laser beam is used to irradiate the pre-laid coating to obtain a self-lubricating and wear-resistant composite coating for the surface of the titanium alloy.

[0064] This application utilizes laser cladding technology and adds hexagonal boron nitride (h-BN) to prepare a self-lubricating and wear-resistant composite coating material with good self-lubricating properties in a wide temperature range from room temperature to 600°C. Applic...

Embodiment 1

[0083] 60 wt% nickel with a particle size of 15 μm to 45 μm, 20 wt% chromium with a particle size of 15 μm to 45 μm, 6.5 wt% boron with a particle size of 15 μm to 45 μm, 8.5 wt% silicon with a particle size of 15 μm to 45 μm and 5 wt% silicon with a particle size of 0.2 μm ~1.5μm hexagonal boron nitride, mixed and dried by mechanical ball milling method to obtain mixed alloy powder;

[0084] Dissolving methyl cellulose in ether, adding the mixed alloy powder to make a paste, coating the surface of Ti6Al4V titanium alloy, and drying to obtain a pre-coat;

[0085] The laser beam with a power of 1.2kW is used to scan and irradiate the pre-coated coating to obtain a self-lubricating and wear-resistant composite coating for the surface of the titanium alloy; wherein, the size of the laser beam is 4 mm in length and 3 mm in width, and the scanning speed is is 2mm / s.

Embodiment 2

[0087] 60 wt% nickel with a particle size of 15 μm to 45 μm, 20 wt% chromium with a particle size of 15 μm to 45 μm, 6.5 wt% boron with a particle size of 15 μm to 45 μm, 8.5 wt% silicon with a particle size of 15 μm to 45 μm and 5 wt% silicon with a particle size of 0.2 μm ~1.5μm hexagonal boron nitride, mixed and dried by mechanical ball milling method to obtain mixed alloy powder;

[0088] Dissolving methyl cellulose in ether, adding the mixed alloy powder to make a paste, coating the surface of Ti6Al4V titanium alloy, and drying to obtain a pre-coat;

[0089] The laser beam with a power of 1.2kW is used to scan and irradiate the pre-coated coating to obtain a self-lubricating and wear-resistant composite coating for the surface of the titanium alloy; wherein, the size of the laser beam is 4 mm in length and 3 mm in width, and the scanning speed is It is 3mm / s.

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Abstract

The application provides a self-lubricating wear-resistant composite coating for a titanium alloy surface and a preparation method of the self-lubricating wear-resistant composite coating. The method comprises the following steps: mixing mixed alloy powder and a binding agent, and then coating on the titanium alloy surface to form a pre-paving coating, wherein the mixed alloy powder comprises the following components in percentage by weight: 59-62% of nickel, 18.5-21% of chromium, 5-8% of boron, 6.5-10% of silicon and 3-7% of hexagonal boron nitride. The pre-paving coating is irradiated by adopting laser beams so as to obtain the self-lubricating wear-resistant composite coating. The mixed alloy powder comprises nickel, chromium, boron and silicon with the contents and can take an excellent anti-wear effect; and meanwhile, the mixed alloy powder comprises a proper amount of h-BN, thus the frictional wear of the coating and the frictional wear between the coating and a mating plate can be reduced, and the high-temperature wear-resistance service life of a titanium alloy can be significantly prolonged. The self-lubricating wear-resistant composite coating provided by the application adopts a laser cladding technology, ensures that a coating micro-structure is fine and compact and can be firmly combined with a titanium alloy matrix, and can be used for significantly improving the comprehensive mechanical performance of the titanium alloy.

Description

technical field [0001] The present application relates to the technical field of titanium alloys, in particular to a self-lubricating wear-resistant composite coating for the surface of titanium alloys and a preparation method thereof. Background technique [0002] Titanium alloy has outstanding advantages such as low density, high specific strength, high yield ratio, excellent corrosion resistance and good biocompatibility, and compared with aluminum alloy, its high-temperature mechanical properties are excellent. Therefore, it is used in aerospace, ships, It has been widely used in the fields of weapons, marine, petroleum, chemical and biomedical engineering. However, titanium alloys also have disadvantages such as large friction coefficient, easy adhesion, difficult lubrication, poor wear resistance and poor high temperature oxidation resistance, which limit their application range to a certain extent, especially seriously restricting titanium alloys as high temperature ...

Claims

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Application Information

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IPC IPC(8): C22C19/05C23C24/10B22F1/00
Inventor 刘秀波任佳罗健相占凤王明娣陈瑶
Owner SUZHOU UNIV
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