Titanium alloy surface multi-element laser alloyed layer and preparation method thereof

A laser alloying and titanium alloying technology, which is applied in the coating process and coating of metal materials, can solve the problems of uneven distribution of alloying elements, burning of alloying elements, and difficulty in precise control of alloying components, so as to improve process quality, Effect of suppressing cracks or cracks and improving surface hardness

Active Publication Date: 2014-08-06
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The systematic determination of the burning loss coefficient of each element and the precise control of the dissolved element amount in the laser melting process have not yet been resolved.
In addition, the automatic feeding device for laser alloying is not yet perfect, which also b...

Method used

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  • Titanium alloy surface multi-element laser alloyed layer and preparation method thereof
  • Titanium alloy surface multi-element laser alloyed layer and preparation method thereof
  • Titanium alloy surface multi-element laser alloyed layer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Cut the titanium alloy plate into block samples, use sandpaper to clean the oxide skin on the surface to be treated, clean it with anhydrous acetone and anhydrous alcohol, and dry it before use; 4 Add water glass solution to the mixed powder of C powder and graphite powder to make a paste evenly. The volume ratio of water glass to distilled water in the water glass solution is 1:3. On average, 5 to 15 drops of water glass solution per gram of mixed powder are used to make the paste mixed powder Apply evenly on the titanium alloy substrate, keep the thickness uniform, and dry naturally; use a continuous laser to scan the sample, and blow nitrogen gas during the scanning process as an alloyed nitrogen source while protecting the molten pool and the laser lens barrel.

[0064] Choose B 4 The mass ratio of C to graphite powder C is 4:1, 2:1, 1:1, 1:2, 1:4, respectively, and the mixed powders are preset on the Ti-6Al-4V substrate for laser alloying treatment. The power is 1...

Embodiment 2

[0070] Cut the titanium alloy plate into a block sample surface to deoxidize and clean and dry; the B 4 Add water glass solution to the mixed powder of C powder and graphite powder to make a paste evenly. The volume ratio of water glass to distilled water in the water glass solution is 1:3. On average, 5 to 15 drops of water glass solution per gram of mixed powder are used to make the paste mixed powder Apply evenly on the titanium alloy substrate, keep the thickness uniform, and dry naturally; use a continuous laser to scan the sample, and blow nitrogen gas during the scanning process as an alloyed nitrogen source while protecting the molten pool and the laser lens barrel.

[0071] Choose B 4 The mixed powder of C and graphite powder C with a mass ratio of 2:1 was preset on the Ti-6Al-4V substrate for laser alloying treatment, the laser power used was 1.0kW, and the scanning speed was 5mm s -1 , N 2 The pressures are 0.2MPa, 0.4MPa and 0.6MPa respectively.

[0072] Studies...

Embodiment 3

[0074] Cut the titanium alloy plate into a block sample surface to deoxidize and clean and dry; the B 4 Add water glass solution to the mixed powder of C powder and graphite powder to make a paste evenly. The volume ratio of water glass to distilled water in the water glass solution is 1:3. On average, 5 to 15 drops of water glass solution per gram of mixed powder are used to make the paste mixed powder Apply evenly on the titanium alloy substrate, keep the thickness uniform, and dry naturally; use a continuous laser to scan the sample, and blow nitrogen gas during the scanning process as an alloyed nitrogen source while protecting the molten pool and the laser lens barrel.

[0075] Carry out laser alloying treatment on Ti-6Al-4V alloy, nitrogen pressure is 0.4MPa, B in pre-coated powder 4 The mass ratio of C to graphite powder is 2:1 or 1:1, and the alloyed layer is obtained under different laser process parameters.

[0076] Table 1 Laser alloying test process parameters and...

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Abstract

The invention relates to a titanium alloy surface multi-element laser alloyed layer and a preparation method thereof. The preparation method comprises the following steps: by using titanium alloy as a base material, applying mixed powder of B4C, graphite, Ti powder and rare-earth oxides Y2O3 used as a coating material onto the titanium alloy surface, and carrying out laser scanning while blowing nitrogen gas to perform alloying, wherein the coating material comprises the following components in percentage by mass: 10-90% of B4C, 10-90% of graphite powder, 0-50% of Ti powder and 0-4% of Y2O3.In an open N2 environment, the B4C and graphite powder are subjected to boron-carbon-nitrogen multi-element composite laser alloying on the titanium alloy surface to prepare the high-hardness wear-resistant composite ceramic coating. The simultaneous addition of the Ti powder and rare-earth oxides Y2O3 is beneficial to enhancing the microhardness and wear resistance of the alloyed layer; and the proper amount of Ti can promote the in-situ reaction in the alloyed layer, and the Y2O3 can refine the structure, thereby enhancing the comprehensive mechanical properties of the coating.

Description

technical field [0001] The invention relates to a titanium alloy surface coating and its preparation, belonging to the technical field of material surface treatment. Background technique [0002] Due to the advantages of high specific strength, heat resistance, corrosion resistance and good low temperature performance, titanium and titanium alloys are widely used in aerospace, petrochemical, machinery, metallurgy, medical and other fields. However, titanium alloy has low hardness and poor wear resistance, especially the problems of fretting wear and adhesive wear are difficult to solve, so it is not suitable for the manufacture of transmission parts in mechanical products, which limits the wider application of titanium alloy. Therefore, how to improve the surface hardness and wear resistance of titanium alloys and expand its application range has aroused extensive attention of researchers in the field of materials at home and abroad. In addition to improving the alloy compo...

Claims

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Application Information

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IPC IPC(8): C23C24/10
Inventor 于慧君李伟陈传忠
Owner SHANDONG UNIV
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