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Titanium and titanium alloy surface antioxidant wear-resistant composite coating and manufacturing method thereof

A technology of composite coating and anti-oxidation layer, which is applied in the direction of metal material coating process, coating, anodic oxidation, etc., to achieve the effect of simple method and meeting the requirements of wear resistance

Active Publication Date: 2015-09-30
SHENYANG LIGONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In short, this composite coating can solve the problem of penetrating cracks on the surface of titanium and titanium alloys after aluminizing; and forms a high-hardness ceramic coating through self-generation, and has high-temperature oxidation resistance and excellent wear resistance.

Method used

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  • Titanium and titanium alloy surface antioxidant wear-resistant composite coating and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Use 50×100×2mm TA2 plates, degrease for 15 minutes in 50g / L sodium hydroxide solution at 85°C, and then rinse with running water;

[0026] (2) At room temperature, put the sample into HNO containing 35% mass concentration 3 Wash with mixed acid containing 4% HF for 50s to remove the scale on the surface of the TA2 sample, take it out and rinse it with running water;

[0027] (3) Dry the sample, immerse it in molten aluminum liquid at 690°C, and dip-coat it for 15 minutes to obtain an aluminum coating;

[0028] (4) The sample is then thermally diffused at 900°C for 480 minutes in a box-type resistivity furnace, and then air-cooled to room temperature to obtain an aluminum-rich aluminized coating;

[0029] (5) In the electrolyte composed of 5g / L sodium silicate and 2g / L sodium hydroxide, set the positive pulse width to 1000μs, the negative pulse width to 1000μs, the interval between pulses to 1000μs, the number of pulses to 1, and the processing time to be 90min , u...

Embodiment 2

[0032] (1) Use a 50×100×2mm TC4 plate, ultrasonically clean it for 30 minutes in acetone solution, and then rinse it with running water;

[0033] (2) At room temperature, put the sample into HNO containing 30% mass concentration 3 Wash with mixed acid containing 5% HF for 30s, remove the scale on the surface of TC4 sample, take it out and rinse it with running water;

[0034] (3) Drying the pretreated titanium alloy, immersing it in molten aluminum liquid at 730°C, and dipping for 2 minutes to obtain an aluminum coating;

[0035] (4) In a box-type resistivity furnace, thermal diffusion treatment was performed at 800°C for 30 minutes, and then air-cooled to room temperature to obtain an aluminum-rich aluminized coating;

[0036] (5) In the electrolyte composed of 5g / L sodium silicate and 2g / L sodium hydroxide, the pulse width is set to 120μs, the pulse interval is 880μs, and the number of pulses is 1. The treated TC4 sample was subjected to micro-arc oxidation treatment for 6...

Embodiment 3

[0039](1) Use a 50×100×2mm TC4 plate, ultrasonically clean it for 30 minutes in acetone solution, and then rinse it with running water;

[0040] (2) At room temperature, put the sample into HNO containing 40% mass concentration 3 Wash with mixed acid composed of HF with a mass concentration of 3% for 30s, remove the scale on the surface of the TC4 sample, and take it out and rinse it with running water;

[0041] (3) Drying the pretreated titanium alloy, immersing it in molten aluminum liquid at 750°C, and dipping for 2 minutes to obtain an aluminum coating;

[0042] (4) In a box-type resistivity furnace, thermal diffusion treatment was performed at 800°C for 30 minutes, and then air-cooled to room temperature to obtain an aluminum-rich aluminized coating;

[0043] (5) In the electrolyte composed of sodium hexametaphosphate 5g / L and disodium hydrogen phosphate 6g / L, set the pulse width to 120μs, the pulse interval to 880μs, the number of pulses to 1, and the current density to...

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Abstract

The invention provides a titanium and titanium alloy surface antioxidant wear-resistant composite coating and a manufacturing method thereof and belongs to the technical field of surface treatment. The titanium and titanium alloy surface antioxidant wear-resistant composite coating and the manufacturing method thereof are used for solving the problems of a protective layer used for achieving high-temperature oxidation resistance of the surface of titanium alloy and improving the abrasion resistance of the surface of the titanium alloy in the prior art. The composite coating is composed of an inner oxygen isolating layer and an outer abrasion-resistant anti-oxidation layer. The oxygen isolating layer is an aluminized coating rich in aluminum, and the main component of the oxygen isolating layer is Til3. The abrasion-resistant anti-oxidation layer is made of high-hardness ceramic containing Al2O3 and TiO2. The manufacturing method comprises the steps that 1, pretreatment of the surface of titanium or titanium alloy; 2, aluminizing treatment of the surface of the titanium or titanium alloy; 3, micro-arc oxidation treatment of the surface of the titanium or titanium alloy. The method is simple and suitable for industrial use. The composite coating is better in high-temperature oxidation resistance compared with an existing protective coating, the problems that through cracks are caused and the bonding force of a painting layer is poor during ordinary aluminizing are solved, the problems that the titanium alloy subjected to ordinary micro-arc oxidation is insufficient in hardness, and nitrided modified coating is thin are also solved, and the requirements of most titanium alloy parts for abrasion resistance are met.

Description

technical field [0001] The invention belongs to the technical field of surface treatment, in particular to an oxidation-resistant and wear-resistant composite coating on the surface of titanium and titanium alloys and a preparation method thereof. Background technique [0002] Titanium and titanium alloys have the advantages of low density, good corrosion resistance, and high specific strength, and are widely used in aerospace, chemical, biomedical and other fields. However, the surface properties of titanium and titanium alloy parts are obviously insufficient during use, mainly in two aspects: (1) titanium and titanium alloys have low surface hardness and poor wear resistance, especially very sensitive to fretting wear; (2) Under high temperature conditions (higher than 600°C), the anti-oxidation performance is insufficient, and severe oxidation occurs, resulting in a decline in the performance of parts and even fractures. Therefore, the range of use of titanium and titani...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/00C23C10/22C25D11/02
Inventor 赵晖王小辉李玉海
Owner SHENYANG LIGONG UNIV
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