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Preparation method of titanium alloy high-density micro-arc oxidation film layer

A technology of micro-arc oxidation and titanium alloy, which is applied in the direction of coating, surface reaction electrolytic coating, electrolytic coating, etc., can solve the problems of weakening the mechanical properties of parts, weakening the thickness of the surface layer, and being unfriendly to the environment of chemical corrosive agents.

Pending Publication Date: 2021-10-29
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, conventional surface treatment methods such as turning can be used for plate and block samples with simple and regular shapes; for complex structures with inner and outer surfaces, chemical or electrochemical polishing has many disadvantages: 1 ) weakens the surface thickness (remove 0.5mm), and is not suitable for surface treatment of thin-walled parts (≤5mm); 2) chemicals will remain at the grain boundary of the sample, weakening the grain boundary, and further weakening the mechanical properties of the part; 3) Chemical caustics are not environmentally friendly

Method used

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  • Preparation method of titanium alloy high-density micro-arc oxidation film layer
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  • Preparation method of titanium alloy high-density micro-arc oxidation film layer

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preparation example Construction

[0029] The invention provides a method for preparing a titanium alloy high-density micro-arc oxidation film, which is specifically implemented according to the following steps:

[0030] Step 1, using laser selective melting and electron beam selective melting technology to prepare the deposited Ti64 workpiece. The forming method is: firstly use Solidworks software for 3D solid modeling, import the file into Magics software for layered slicing and adding supports, and then export The STL format file of the workpiece and support; then import it into the computer system of the equipment to set the printing parameters; put the ultra-low clearance spherical Ti64 powder with a particle size distribution of 45-106 μm in the powder supply bin of the 3D printing equipment, when vacuum up to 5×10 -3 Start to print the workpiece at Pa, and prepare a deposited Ti64 workpiece;

[0031] The SLM equipment adopts the Mlabcusing R-type laser metal additive manufacturing equipment of Concept L...

Embodiment 1

[0040] Step 1, using laser selective melting technology to prepare deposited Ti64 bulk workpiece, the size is: 20mm×20mm×5mm (length×width×height), the particle size distribution of the formed powder is 15-53μm; the forming process parameters are laser power 100W , the diameter of the spot is 45 μm, the thickness of the powder layer is 25 μm, the scanning distance is 25 μm, and the scanning speed is 1500 mm / s, and the deposited Ti64 workpiece is obtained;

[0041] In step 2, the deposited Ti64 workpiece obtained in step 1 is subjected to micro-arc oxidation surface treatment in constant current mode, and the electrolyte is Na 2 SiO 3 System solution: 2% Na 2 SiO 3 , 0.4% KOH and 1% (NaPO 3 ) 6 , pulse width 120us, frequency 500Hz, duty cycle 20%, current density J=1.5A / cm 2 , time 5min;

[0042] Step 3, the Ti64 workpiece obtained through the micro-arc oxidation obtained in step 2 is subjected to surface 3D topography observation, and the surface topography is as follows...

Embodiment 2

[0047] Step 1, using electron beam selective melting technology to prepare deposited Ti64 bulk workpiece, the size is: 20mm×20mm×5mm (length×width×height), and the particle size distribution of the formed powder is 45-106 μm. The forming process parameters are continuously adjustable laser power 50-3500W, beam spot diameter 100μm, powder layer thickness 50μm, scanning distance 80μm, scanning speed 500mm / s, vacuum degree 5×10 -3 Pa, to obtain deposited Ti64 workpiece;

[0048] In step 2, the deposited Ti64 workpiece obtained in step 1 is subjected to micro-arc oxidation surface treatment in constant current mode, and the electrolyte is Na 2 SiO 3 System solution: 2% Na 2 SiO 3 , 0.4% KOH and 1% (NaPO 3 ) 6 , pulse width 120us, frequency 500Hz, duty cycle 20%, current density J=1.5A / cm 2 , time 5min;

[0049] Step 3, the Ti64 workpiece obtained through the micro-arc oxidation obtained in step 2 is subjected to surface 3D topography observation, and the surface topography ...

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Abstract

The invention discloses a preparation method of a titanium alloy high-density micro-arc oxidation film layer. The preparation method is specifically implemented according to the following steps that step 1, firstly, a titanium alloy plate-shaped workpiece is prepared by adopting SLM and SEBM equipment; step 2, the titanium alloy plate-shaped workpiece prepared in the step 1 is subjected to micro-arc oxidation surface treatment in a constant-voltage and constant-current mode, and the titanium alloy high-density micro-arc oxidation film layer is obtained; according to the method, the problems that powder adheres to the surfaces of parts, the roughness is large and the corrosion resistance is poor in the 3D printing process in the prior art are solved, the means and methods for eliminating or weakening the adverse influence factors are developed, and the corrosion resistance, hardness and the like of materials after 3D printing preparation are improved.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing surface treatment, and relates to a method for preparing a titanium alloy high-density micro-arc oxidation film layer. Background technique [0002] Additive Manufacturing (AM) technology has unique advantages such as no need for molds, large degrees of freedom in design and manufacturing, reusable raw materials without waste, and rapid prototyping of complex-shaped parts. The innovation of this technology in manufacturing concepts and models has become one of the key technologies leading technological innovation and industrial transformation, and it has developed rapidly in many fields such as aerospace, biomedicine and automobile manufacturing. At present, the main metal AM materials include Ti64, 316L stainless steel, Al10SiMg, and Inconel718, among which Ti64 alloy is the most studied and deepest alloy. Ti64 alloy has low density, high strength, excellent corrosion resistance, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/26
CPCC25D11/26C25D11/026
Inventor 杨鑫赖杨凯孙晨皞王风辉张兆洋王犇王婉琳马文君
Owner XIAN UNIV OF TECH
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