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Method for preparing high-temperature-oxidation-preventing titanium alloy coating by compounding laser alloying with micro-arc oxidation

A technology of laser alloying and high temperature oxidation prevention, applied in the direction of metal material coating process, coating, anodization, etc., can solve problems such as inability to meet, and achieve the effect of improving quality, improving high temperature oxidation resistance, and reducing damage

Pending Publication Date: 2021-02-23
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the above two technologies have improved the high-temperature oxidation resistance of titanium alloys to a certain extent, a single treatment obviously cannot meet the higher requirements

Method used

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  • Method for preparing high-temperature-oxidation-preventing titanium alloy coating by compounding laser alloying with micro-arc oxidation
  • Method for preparing high-temperature-oxidation-preventing titanium alloy coating by compounding laser alloying with micro-arc oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) Pre-treatment of titanium alloy, including grinding, cleaning and drying.

[0035] 2) Pre-place the alloy coating on the surface of the material, and control the layer thickness to 0.5mm. The alloy components in the alloy coating are: Al: 80wt.%, Si: 15wt.%, Nb: 5wt.%, and it can be carried out after it is completely air-dried Next step.

[0036] 3) Set the laser alloying process: laser power 1000W, scanning speed 1000mm / s, scanning distance 0.04mm, laser alloying treatment on the sample;

[0037] 4) Grinding the surface of the sample after laser alloying treatment to Ra 0.8 μm;

[0038] 5) Configure electrolyte: NaAlO 2 15g / L, Na 2 SiO 3 4g / L, ZrO 2 2g / L;

[0039] 6) Set the pulse power supply current density of the micro-arc oxidation process to 9A / dm 2 , The pulse frequency is 500Hz, the duty cycle is 30%, the electrode spacing is 10mm, the electrolyte flow rate is 0.5mm / s, the cathode moving speed is 3mm / min, and the film overlap rate is 40%, and the mi...

Embodiment 2

[0043] The alloy composition in the alloy paint is: Al: 50wt.%, Si: 25wt.%, Nb: 25wt.%, and the thickness of the control layer is 0.5mm.

[0044] Set the laser alloying process: laser power 1000W, scanning speed 1000mm / s, scanning distance 0.04mm.

[0045] Grind the surface of the sample after laser alloying treatment to Ra 0.8μm

[0046] Configuration electrolyte: NaAlO 2 4g / L, Na 2 SiO 3 8g / L, ZrO 2 5g / L.

[0047] Set the pulse power supply current density of micro-arc oxidation process to 9A / dm 2, The pulse frequency is 500Hz, the duty ratio is 30%, the electrode spacing is 10mm, the electrolyte flow rate is 0.5mm / s, the cathode moving speed is 3mm / min, and the film overlap rate is 40%.

[0048] Other processing steps are as embodiment 1.

[0049] The surface of the prepared coating was inspected, and the surface quality of the coating was good without defects.

[0050] After high-temperature oxidation at 900°C for 100 hours, the substrate oxidation weight gain i...

Embodiment 3

[0052] The alloy components in the alloy paint are: Al: 80wt.%, Si: 15wt.%, Nb: 5wt.%, and the control layer thickness is 0.2.

[0053] Set the laser alloying process: laser power 500W, scanning speed 200mm / s, scanning distance 0.08mm.

[0054] Grinding the surface of the sample after laser alloying treatment to Ra 1.6μm

[0055] Configuration electrolyte: NaAlO 2 15g / L, Na 2 SiO 3 4g / L, ZrO 2 2g / L.

[0056] Set the pulse power supply current density of micro-arc oxidation process to 3A / dm 2 , The pulse frequency is 1000Hz, the duty cycle is 10%, the electrode spacing is 15mm, the electrolyte flow rate is 1.5mm / s, the cathode moving speed is 5mm / min, and the film overlap rate is 20%.

[0057] Other processing steps are as embodiment 1.

[0058] The surface of the prepared coating was inspected, and the surface quality of the coating was good without defects.

[0059] After high-temperature oxidation at 900°C for 100 hours, the substrate oxidation weight gain is 27.9...

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Abstract

The invention discloses a method for preparing a high-temperature-oxidation-preventing titanium alloy coating by compounding laser alloying with micro-arc oxidation. The laser alloying and the micro-arc oxidation are mainly utilized for treating the surface of titanium alloy so as to solve the problem that the overall performance of a workpiece is reduced due to the fact that the surface of the titanium alloy is easy to oxidize under high-temperature service. The method has the main creativity that the limitation of traditional immersion type micro-arc oxidation on the size of the workpiece isbroken through, and the method can be used for overall / local treatment for the large-size titanium alloy workpiece; the thickness of a coating needing to be prepared by the laser alloying is reducedby introducing a micro-arc oxidation technology, the damage of laser treatment to a matrix is reduced, the use performance of the treated material is improved, and the service life of the treated material is prolonged; and meanwhile, the film forming quality and density of the micro-arc oxidation can be improved by regulating and controlling the components of an alloying layer, and the problem that the performance improvement of the micro-arc oxidation coating is limited due to the porous property is solved.

Description

technical field [0001] The invention discloses a method for preparing a titanium alloy high-temperature oxidation-resistant coating by laser alloying combined micro-arc oxidation, which relates to laser alloying and micro-arc oxidation technology, and is used for improving the high-temperature oxidation resistance of the titanium alloy surface. Background technique [0002] Titanium and titanium alloys are light metal structural materials with low density and high strength, which are widely used in aerospace, chemical industry, shipbuilding and other fields. For example, aircraft engine pressure plates, blades and casings made of titanium alloys can improve the thrust-to-weight ratio of aero-engines and the maneuverability of aircraft. As the proportion of titanium alloys used in high-performance aircraft increases, higher requirements will naturally be placed on its use temperature. However, under high-temperature service, the surface of titanium alloys is prone to oxidati...

Claims

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Application Information

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IPC IPC(8): C23C24/10C22C21/00C22C21/02C25D11/06
CPCC23C24/103C22C21/00C22C21/02C25D11/026C25D11/024C25D11/06
Inventor 姚建华王晔吴国龙张群莉陈智君王梁董刚李波姚喆赫杨高林
Owner ZHEJIANG UNIV OF TECH
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