A wear-resistant and low-friction composite coating on the surface of titanium and its alloys and its preparation method

A composite coating and low-friction technology, which is applied in the direction of surface reaction electrolytic coating, metal material coating process, coating, etc., can solve the problem of aging of the resin-based film layer, accelerate the wear and tear of friction pairs, and reduce the coating Friction coefficient and other issues, to achieve the effect of expanding the use range and space, strong bonding force, and reducing the tendency of peeling

Active Publication Date: 2019-02-01
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the hard ceramic coating prepared by the above method has excellent corrosion resistance, the friction coefficient of the coating is high, and it is easy to accelerate the wear failure of the friction pair.
For this reason, Chinese Patent No. CN201310025662.X discloses a patent titled a titanium alloy self-lubricating composite film and its preparation method, which prepares a composite ceramic oxide film and epoxy resin through micro-arc oxidation and repeated coating. The self-lubricating film layer effectively improves the wear resistance of titanium materials and reduces the friction coefficient of the coating, but the resin-based film layer is prone to aging
E.E.Sukuroglu et al. used magnetron sputtering to deposit a layer of DLC film with low friction coefficient on the surface of micro-arc oxidation film, which effectively improved the coating friction performance (E.E.Sukuroglu, Y.Totik, E.Arslan, I.Efeoglu.Analysis of tribo-corrosion properties of MAO / DLC coatings using aduplex process on Ti6Al4V alloys[J].J.Bio.Tribo.Corros.,2015,1:22), but there is an abrupt interface between the DLC and the oxide ceramic layer, and the severe friction Under environmental conditions, it is easy to cause the top film layer to fall off

Method used

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  • A wear-resistant and low-friction composite coating on the surface of titanium and its alloys and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Using TA1 pure titanium as the substrate, the preparation method of the wear-resistant and low-friction composite coating mainly includes: using the micro-arc oxidation technology to prepare the pre-treated titanium in the graphite mixed electrolyte to prepare the precursor oxidation coating containing graphite, wherein In the micro-arc oxidation process, the voltage is 380V, the processing time is 20min, the frequency is 50Hz, and the duty cycle is 20%; the electrolyte composition is 10g / L Na 2 SiO 4 , 3g / LKOH, 2g / L nano graphite (thickness≤40nm, sheet diameter≤400nm), 40mL / L absolute ethanol and, 1g / L sodium hydroxymethylcellulose. Then plasma nitriding treatment is carried out on the precursor oxide coating, wherein the voltage is 400V, the treatment time is 2h, Ar / N 2 =0.5, vacuum degree 40Pa.

Embodiment 2

[0022] With TA1 pure titanium as the substrate, the preparation process of the composite coating is the same as in Example 1, except that in the micro-arc oxidation process, the voltage is 400V, the treatment time is 25min, the frequency is 100Hz, and the duty ratio is 10%; the electrolyte composition is 13g / L Na 2 SiO 4 , 5g / LKOH, 3g / L nano-graphite (thickness≤40nm, sheet diameter≤400nm), 50mL / L absolute ethanol and, 1.5g / L sodium hydroxymethylcellulose. In the plasma nitriding treatment process, the voltage is 450V, the treatment time is 2.5h, Ar / N 2 =0.1, vacuum degree 50Pa.

Embodiment 3

[0024] With TA1 titanium alloy as the substrate, the preparation process of the composite coating is the same as in Example 1, except that in the micro-arc oxidation process, the voltage is 410V, the treatment time is 25min, the frequency is 100Hz, and the duty ratio is 10; the electrolyte composition is 12g / L Na 2 SiO 4 , 2g / LKOH, 3g / L nano-graphite (thickness≤40nm, sheet diameter≤400nm), 50mL / L absolute ethanol and, 1g / L sodium hydroxymethylcellulose. In the plasma nitriding treatment process, the voltage is 450V, the treatment time is 3h, N 2 Atmosphere, vacuum degree 50Pa.

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Abstract

The invention relates to a surface wear-resistant and low-friction composite coating of titanium and an alloy thereof, and a preparation method thereof. The preparation method comprises the following steps: preparing a graphite-containing precursor oxidation coating on the surface of a test piece of the titanium or the alloy thereof by virtue of a micro-arc oxidation technology; and carrying out plasma nitriding treatment on the precursor oxidation coating. The composite coating provided by the invention is capable of improving the wear resistance of the titanium and the alloy thereof, and has a low friction coefficient, thus effectively slowing down the wear failure of a friction pair, and expanding the application range of the titanium and the alloy thereof.

Description

technical field [0001] The invention relates to the field of surface protection coating materials, in particular to a wear-resistant and low-friction composite coating on the surface of titanium and its alloys and a preparation method thereof. Background technique [0002] Titanium and its alloys are excellent light-weight structural materials. They have the advantages of high specific strength, non-magnetism, and outstanding resistance to seawater and marine atmospheric corrosion. Therefore, they have wide applicability in various marine projects and are known as marine "exotic materials". . Although titanium has many excellent properties as a material for marine engineering, it is not all good. In the application process, there are problems such as insufficient wear resistance, which restricts the application of titanium. At present, methods to improve the wear resistance of titanium and its alloys include micro-arc oxidation and laser cladding. Although the hard ceramic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/26C23C8/36
CPCC23C8/36C25D11/26
Inventor 姚正军陶学伟罗西希杜文博刘莹莹
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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