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High temperature resistant self-lubricating coating on titanium alloy surface and preparation method thereof

A technology of self-lubricating coating and high temperature resistance, which is applied in the coating process and coating of metal materials, can solve the difficult problems of boron nitride retention and other problems, achieve good surface quality, improve plasticity and toughness, and improve wear resistance at room temperature Effect

Active Publication Date: 2022-04-05
SHANDONG AGRI & ENG UNIV +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But, inventor finds, Ti has very strong affinity with B, N atom, easily reacts and generates ceramic phases such as TiB, TiN, is difficult to realize the retention of boron nitride in the alloying layer, and this is seldom about now Reasons for the Reported Solid Lubrication Effect of Boron Nitride in Laser Alloyed Layers on Titanium Alloy Surfaces

Method used

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  • High temperature resistant self-lubricating coating on titanium alloy surface and preparation method thereof
  • High temperature resistant self-lubricating coating on titanium alloy surface and preparation method thereof
  • High temperature resistant self-lubricating coating on titanium alloy surface and preparation method thereof

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Embodiment 1

[0045] The present invention adopts the most widely used Ti-6Al-4V titanium alloy in the industry as the base material, and cuts the Ti-6Al-4V plate into 10mm×10mm×20mm and 25mm×25mm×10mm sample blocks with wire cutting, the latter for wear tests. with SiO 2 The surface of the sample was polished with sandpaper to remove the oxide skin on the surface of the sample, and the sample block was cleaned with alcohol and dried for later use.

[0046] h-BN@Ni powder was used as alloying material. The mass fraction of hexagonal boron nitride (h-BN) in the h-BN@Ni is 30wt.%, and the balance is Ni. The alloyed powder is pre-spread on the surface of the sample, and the thickness is controlled to be about 1mm.

[0047] Using TFL-H6000 type cross-flow CO 2 The laser is used for laser alloying, and the molten pool is protected with argon to prevent the molten pool from oxidizing CO 2 The power of the gas laser is 4kW, the scanning speed is 300mm / min, the spot diameter is 4mm; the argon ...

Embodiment 2

[0054] The difference with embodiment 1 is:

[0055] In the h-BN@Ni powder, the mass percentage of h-BN is 40wt.%, and the balance is Ni. The surface quality of the coating is good, more hard phases are formed, the hardness is higher, and the wear resistance is greatly improved.

Embodiment 3

[0057] The difference with embodiment 1 is:

[0058] In the h-BN@Ni powder, the mass percentage of h-BN is 50wt.%, and the balance is Ni. The surface quality of the coating is good, more hard phases are formed, the hardness is the highest, and the wear resistance is the best.

[0059] The morphology of the coating is as image 3 In, g and h are shown. The X-ray diffraction results of h-BN@Ni powder and alloyed layer are as follows Figure 5 , Figure 6 shown. The results show that the alloyed layer is mainly composed of γ-Ni, TiN, NiTi, NiTi 2 , TiB, h-BN and other phase compositions. Compared with the X-ray diffraction results of the h-BN@Ni alloyed material used in the test, TiN, TiB, and Ni-Ti intermetallic compounds were formed in the alloyed layer. The most easily formed TiB is not found in the alloyed layer 2 , which may be because at higher laser energy density, more matrix is ​​melted, and there are excess Ti atoms in the molten pool, which is different from Ti...

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Abstract

The invention discloses a high temperature resistant self-lubricating coating on the surface of a titanium alloy and a preparation method thereof. The nickel-coated hexagonal boron nitride is used as an alloying powder and prepared by laser alloying. The main phase in the coating includes γ‑ Ni, TiN, NiTi, NiTi 2 , TiB and h‑BN, etc. TiN and TiB are ceramic phases with extremely high hardness. These strengthening phases are evenly distributed on the matrix phase of the alloyed layer. These phase interfaces hinder the movement of dislocations and play the role of dispersion strengthening. The hardness of the alloyed layer is improved. The softer matrix phase provides the required plasticity for the alloyed layer, and the discontinuous precipitates and continuous matrix phase make it difficult for cracks to expand, which improves the plasticity and toughness of the alloyed layer, thereby significantly improving the wear resistance of the coating. . The Ni coated on the surface of the powder prevents h-BN from directly contacting with the Ti in the molten pool, so that part of the h-BN in the alloyed layer can be retained, and the retained h-BN acts as a lubricant at high temperature, which significantly reduces the The coefficient of friction on the surface of the alloyed coating plays a role in reducing friction.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy surface modification, and in particular relates to a high-temperature-resistant self-lubricating coating on the surface of titanium alloy and a preparation method thereof. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] As a new type of structural material, titanium alloy has the advantages of low density, high specific strength and good corrosion resistance, so it is widely used in aerospace, biomedicine, automobile industry and other fields. However, titanium alloys have the disadvantages of low hardness and poor wear resistance, which limit their further applications. In recent years...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10C22C19/03C22C29/16
CPCC23C24/103C22C19/03C22C29/16C22C29/005
Inventor 陈传忠路璐于慧君
Owner SHANDONG AGRI & ENG UNIV
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