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Laser alloying layer on titanium alloy surface and preparation process thereof

A technology of laser alloying and preparation process, which is applied in the direction of metal material coating process and coating, which can solve the problem of decreased toughness of the alloyed layer, failure to meet performance requirements, and reduced wear resistance and corrosion resistance of the alloyed layer and other issues to achieve the effect of low cost and high cost performance

Active Publication Date: 2014-03-05
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, if the laser surface alloying of a single material will cause some shortcomings, it will not meet the required performance requirements
For example, TiC is formed by laser titanium alloying, which is easy to form developed dendrites in the alloyed layer, which leads to a decrease in the toughness of the alloyed layer and is prone to cracks
Laser nitriding is also easy to form cracks, thereby reducing the wear resistance and corrosion resistance of the alloyed layer

Method used

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  • Laser alloying layer on titanium alloy surface and preparation process thereof
  • Laser alloying layer on titanium alloy surface and preparation process thereof
  • Laser alloying layer on titanium alloy surface and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] With Ti-6Al-4V as the base material, the mass composition of the coating material used is 67.4% of BN powder and 32.6% of graphite powder.

[0062] (1) Cut the base material into a size of 10×10×12mm with a wire cutting machine 3 For the block sample, a groove of 8mm×10mm and 0.5mm deep is milled along the width direction on the 12mm×10mm surface. The bottom surface of the groove is polished with sandpaper to remove impurities such as scale, cleaned with gasoline and absolute ethanol respectively, dried and set aside.

[0063] (2) mix the BN and the graphite powder of the above-mentioned mass percentage with a ball mill, adjust the mixed powder into a uniform paste with a water glass solution, and evenly apply it to the base metal surface, that is, in the groove described in the above-mentioned step (1), Keep the thickness even and dry before use.

[0064] (3) Use a continuous laser to scan the sample (the instrument HJ-4 cross-flow CO 2 Gas laser, rated power 1500W)...

Embodiment 2

[0072] With Ti-6Al-4V as the base material, the mass composition of the coating material used is 50.8% of BN powder and 49.2% of graphite powder.

[0073] (1) Cut the base material into a size of 10×10×12mm with a wire cutting machine 3 For the block sample, a groove of 8mm×10mm and 0.5mm deep is milled along the width direction on the 12mm×10mm surface. The bottom surface of the groove is polished with sandpaper to remove impurities such as scale, cleaned with gasoline and absolute ethanol respectively, dried and set aside.

[0074] (2) mix the BN and the graphite powder of the above-mentioned mass percentage with a ball mill, adjust the mixed powder into a uniform paste with a water glass solution, and evenly apply it to the base metal surface, that is, in the groove described in the above-mentioned step (1), Keep the thickness even and dry before use.

[0075] (3) Use a continuous laser to scan the sample, use a power of 1000W, keep the spot diameter at 4mm, and scan at a...

Embodiment 3

[0080] With Ti-6Al-4V as the base material, the mass composition of the coating material used is 80.5% of BN powder and 19.5% of graphite powder.

[0081] (1) Cut the base material into a size of 10×10×12mm with a wire cutting machine 3 For the block sample, a groove of 8mm×10mm and 0.5mm deep is milled along the width direction on the 12mm×10mm surface. The bottom surface of the groove is polished with sandpaper to remove impurities such as scale, cleaned with gasoline and absolute ethanol respectively, dried and set aside.

[0082] (2) mix the BN and the graphite powder of the above-mentioned mass percentage with a ball mill, adjust the mixed powder into a uniform paste with a water glass solution, and evenly apply it to the base metal surface, that is, in the groove described in the above-mentioned step (1), Keep the thickness even and dry before use.

[0083] (3) Use a continuous laser to scan the sample, use a power of 1000W, keep the spot diameter at 4mm, and scan at a...

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Abstract

The invention relates to a laser alloying layer on a titanium alloy surface and a preparation process thereof. Titanium or titanium alloy is used as a matrix material, and BN or BN and graphite powder are used as a coating material which is applied to the matrix material; a continuous laser is used for scanning a sample, wherein the service power is 800-1,200W, the diameter of a light spot is kept at 4mm, and the scanning speed is 2-10mm / s; in a scanning process of a laser beam, argon is blown to protect a molten pool and a laser lens barrel, and the argon pressure is kept at 0.2-0.4MPa. In the invention, the BN and graphite powder have similar structure and relatively good compatibility; after laser treatment, possible residual BN and graphite particles on the alloying layer can realize an antifriction effect to a certain degree; the surface of the alloying layer is relatively flat, the microstructure is dense, and the hardness is remarkably improved over the matrix.

Description

technical field [0001] The invention relates to a laser alloying layer on the surface of a titanium alloy and a preparation process thereof, belonging to the technical field of metal material surface strengthening and modification. Background technique [0002] Titanium and its alloys are widely used in various fields of industrial production due to their advantages such as high specific strength, good corrosion resistance and low temperature performance. to full play. [0003] Laser alloying is a new method for local modification of the surface of metal materials. It is one of the most active fields in the research of laser surface modification technology. It uses high-energy-density laser beams to make the added alloy elements and the surface of the base material simultaneously. Melt and mix to form a certain thickness of surface alloy layer in a short time. The non-equilibrium process of rapid melting can make the alloying elements reach a high degree of supersaturation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
Inventor 于慧君陈传忠翁飞
Owner SHANDONG UNIV
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