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Composite wear-resistant antifriction coating on titanium alloy surface and preparation method thereof

A surface composite and anti-friction coating technology, which is applied in the field of wear-resisting and anti-friction of titanium alloys, can solve problems such as no patent reports, improve bonding strength and bearing capacity, enhance storage and replenishment capacity, and improve surface friction performance Effect

Inactive Publication Date: 2015-04-01
NANJING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no relevant patent report on the technical development in this area.

Method used

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  • Composite wear-resistant antifriction coating on titanium alloy surface and preparation method thereof
  • Composite wear-resistant antifriction coating on titanium alloy surface and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Surface Texturing / Ceramicization of a Titanium Alloy-MoS 2 The preparation method of composite coating, concrete preparation steps are as follows:

[0033] (1) Carry out polishing and degreasing pretreatment to titanium alloy substrate;

[0034] (2) Nd:YAG pulsed laser is used to texture the pretreated sample, the number of pulses at the same point is 5 times, the micropore diameter D=300 μm, the spacing L=800 μm, the depth h=55 μm, and the area occupancy rate S= 11%;

[0035] (3) Using HF-HNO 3 The solution activates the textured sample and removes surface oxides;

[0036] (4) Using the activated sample as the anode, perform plasma electrolytic oxidation treatment in the aluminate-phosphate mixed electrolyte, the electrolyte contains 12g / L of sodium aluminate, 1g / L of sodium phosphate, and 0.3g of sodium hydroxide / L, pH=12, where the pulse voltage is 460V, the pulse frequency is 100Hz, the duty cycle is 20%, and the processing time is 60min;

[0037] (5) Deposit ...

Embodiment 2

[0039]A kind of preparation method of titanium alloy surface texturing / ceramization-PTFE composite coating, concrete method is as follows:

[0040] (1) Carry out polishing and degreasing pretreatment to titanium alloy substrate;

[0041] (2) Nd: YAG pulsed laser is used to texture the pretreated sample, the number of pulses at the same point is 1, the micropore diameter D = 50 μm, the spacing L = 300 μm, the depth h = 15 μm, and the area occupancy rate S = 2%;

[0042] (3) Using HF-HNO 3 The solution activates the textured sample and removes surface oxides;

[0043] (4) Using the activated sample as the anode, carry out plasma electrolytic oxidation treatment in the phosphate electrolyte, the electrolyte contains sodium phosphate 15g / L, sodium hydroxide 1g / L, pH=14, wherein the pulse voltage is 400V, pulse Frequency 1kHz, duty cycle 10%, processing time 10min;

[0044] (5) On the textured / ceramic surface, a coating process is used to deposit a lubricating coating of nano-P...

Embodiment 3

[0046] A kind of preparation method of titanium alloy surface texturing / ceramization-graphite composite coating, concrete method is as follows:

[0047] (1) Carry out polishing and degreasing pretreatment to titanium alloy substrate;

[0048] (2) Nd: YAG pulsed laser is used to texture the pretreated sample, the number of pulses at the same point is 3 times, the micropore diameter D = 260 μm, the spacing L = 300 μm × 500 μm, the depth h = 35 μm, and the area occupancy S = 35%;

[0049] (3) Using HF-HNO 3 The solution activates the textured sample and removes surface oxides;

[0050] (4) Using the textured sample as the anode, conduct plasma electrolytic oxidation treatment in the aluminate electrolyte, the electrolyte contains 5g / L sodium aluminate, 0.6g / L sodium hydroxide, pH=13, where the pulse voltage 430V, pulse frequency 500Hz, duty cycle 15%, processing time 30min;

[0051] (5) On the textured / ceramic surface, a nano-graphite lubricating coating was deposited by a sp...

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Abstract

The invention discloses a composite wear-resistant antifriction coating on a titanium alloy surface and a preparation method thereof. The coating comprises a laser texturing surface, an oxide ceramic layer and a self-lubricating coating which are connected in sequence, wherein micropore arrays are uniformly distributed on the laser texturing surface; the oxide ceramic layer is a hard oxide ceramic coating; and the self-lubricating coating is a MoS2 coating, PTFE (polytetrafluoroethylene) coating or graphite coating. In the invention, the laser surface texturing technology is combined with the plasma electrolytic oxidation technology, and a texturing / ceramization composite coating is prepared on the titanium alloy surface which is then coated with a solid lubricant to improve the friction performance of the surface.

Description

technical field [0001] The invention relates to a titanium alloy wear-resistant and friction-reducing technology, in particular to a composite wear-resistant and friction-reducing coating on the surface of a titanium alloy and a preparation method thereof. Background technique [0002] Titanium alloy has the characteristics of good corrosion resistance, high strength, low specific gravity, etc. It is widely used in aviation and aerospace devices (bearing parts, turbine blades, etc.), and is expected to be used in engine connecting rods, intake valves, movable turbines, etc. Substitutes heavier steels for components such as superchargers and pistons. However, due to the low surface hardness and poor sliding friction properties of titanium alloys, abrasion damage often occurs, showing high wear and unstable friction coefficients, which limits the application of titanium alloys in the field of tribology. [0003] In recent years, plasma electrolytic oxidation (Plasma Electroly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/26
CPCC25D11/024C25D11/26
Inventor 熊党生秦永坤李建亮
Owner NANJING UNIV OF SCI & TECH
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