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Laser cladding coating powder and preparation method thereof

A laser cladding and powder technology, applied in coatings, metal material coating processes, etc., can solve the problems of easy volatilization and splashing, low powder quality, and difficulty in laser cladding of elemental aluminum, so as to reduce volatilization and splashing, The effect of grain refinement and good macroscopic appearance

Active Publication Date: 2019-03-29
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, many coating preparation methods are prepared by simple powder, and in the laser cladding experiment, the experimental temperature is relatively high. For example, Al powder is a typical light metal. Due to its relatively low melting point, boiling point and density, the powder quality Relatively small, very easy to volatilize and spatter in this case, elemental aluminum is difficult to laser cladding

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  • Laser cladding coating powder and preparation method thereof
  • Laser cladding coating powder and preparation method thereof
  • Laser cladding coating powder and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] A laser cladding coating powder whose composition and mole fraction are: TiAl powder: 99%, B powder: 1%, the average particle size of TiAl powder is 100 mesh, the average particle size of B powder is 200 mesh, TiAl powder contains Ti and The atomic ratio of Al is 1:1.

[0032] The preparation method of laser cladding coating includes the following steps:

[0033] (1) Pretreatment of the substrate: polish and clean the metal substrate, and the specific steps of polishing and cleaning: the surface of the metal substrate is polished with 200 grit sandpaper and then polished with 400 grit sandpaper, and polished until the surface has no coarse scratches. Make sure the direction of the wear scar is the same and the surface is bright. Then clean with alcohol and acetone to remove the oxide film and oil stain on the surface of the metal substrate. After drying, the metal substrate is TC4 titanium alloy. The chemical composition is shown in Table 1.

[0034] (2) Weigh the laser cladd...

Embodiment 2

[0041] A laser cladding coating powder whose composition and mole fraction are: TiAl powder: 90%, B powder: 10%, the average particle size of TiAl powder is 120 mesh, the average particle size of B powder is 220 mesh, TiAl powder contains Ti and The atomic ratio of Al is 1:1.

[0042] The preparation method of laser cladding coating includes the following steps:

[0043] (1) Pretreatment of the substrate: polish and clean the metal substrate, and the specific steps of polishing and cleaning: the surface of the metal substrate is polished with 200 grit sandpaper and then polished with 400 grit sandpaper, and polished until the surface has no coarse scratches. Make sure the direction of the wear scar is the same, and the surface is bright, and then clean with alcohol and acetone to remove the oxide film and oil on the surface of the metal substrate. After drying, the metal substrate is TC4 titanium alloy, and its chemical composition is the same as that of Example 1.

[0044] (2) Weig...

Embodiment 3

[0049] A laser cladding coating powder whose composition and mole fraction are: TiAl powder: 96%, B powder: 4%, the average particle size of TiAl powder is 150 mesh, the average particle size of B powder is 250 mesh, TiAl powder contains Ti and The atomic ratio of Al is 1:1.

[0050] The preparation method of laser cladding coating includes the following steps:

[0051] (1) Pretreatment of the substrate: polish and clean the metal substrate, and the specific steps of polishing and cleaning: the surface of the metal substrate is polished with 200 grit sandpaper and then polished with 400 grit sandpaper, and polished until the surface has no coarse scratches. Make sure the direction of the wear scar is the same, and the surface is bright, and then clean with alcohol and acetone to remove the oxide film and oil on the surface of the metal substrate. After drying, the metal substrate is TC4 titanium alloy, and its chemical composition is the same as that of Example 1.

[0052] (2) Weigh...

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Abstract

The invention discloses laser cladding coating powder and a preparation method thereof. The laser cladding coating powder is prepared from the components by mole: 90%-99% of TiAl powder and 1%-10% ofB powder; and the preparation method comprises the steps of metal matrix selection and pretreatment, powder matching and ball milling, powder presetting, and laser cladding. TiAl and B make an in-situreaction through the effect of a CO2 laser beam, and a TiAl based alloy coating with TiB and TiB2 as reinforcing phases is prepared on the surface of a metal matrix. According to the laser cladding coating powder and the preparation method thereof, the hardness of the laser cladding coating is high, good wear resistance and corrosion resistance are achieved, and the laser cladding coating is bonded to the matrix in a metallurgical mode and the bonding condition is good.

Description

Technical field [0001] The invention relates to a laser cladding coating powder and a preparation method thereof, belonging to the technical field of laser cladding metal material surface modification. Background technique [0002] Aluminum alloy has low density, high specific strength, low coefficient of thermal expansion, and is easy to process. It has good electrical conductivity, thermal conductivity, plasticity, weldability and mechanical properties. As a lightweight structural material, aluminum alloy is widely used in aviation, aerospace, automobile, shipbuilding and other industrial fields. However, its inherent characteristics of friction and wear and poor high-temperature oxidation resistance limit its further use in complex environments or harsh working conditions. Similarly, titanium alloys are widely used in various fields such as aerospace, petrochemicals, automobiles, ships, and military chemicals due to their high specific strength, high specific stiffness, excel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
CPCC23C24/103
Inventor 刘洪喜赵艳爽张晓伟张璐璐
Owner KUNMING UNIV OF SCI & TECH
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