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Titanium alloy laser cladding surface reinforcing method

A laser cladding and surface strengthening technology, applied in the coating process and coating of metal materials, etc., can solve the problems of increasing the cracking sensitivity of the laser cladding layer, easy to form inclusions, complicated processes, etc., to increase the cracking sensitivity, The effect of low inclusions and low porosity

Active Publication Date: 2014-03-26
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Patent CN102912189A relates to a preparation method of cobalt-based alloy powder. The powder contains 3.5-5.5% Si and 1.5-3% B (both are mass fractions, the same below), and the Si and B contents are relatively high. During the laser cladding process Borosilicate is formed, a large amount of borosilicate cannot float out of the rapidly solidified molten pool, and it is easy to form inclusions, which increases the cracking sensitivity of the laser cladding layer
Moreover, the process used in this patent to produce cobalt-based alloy powder for laser cladding is complicated. Once the powder is prepared, the composition is determined immediately, and it is difficult to adjust

Method used

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  • Titanium alloy laser cladding surface reinforcing method
  • Titanium alloy laser cladding surface reinforcing method
  • Titanium alloy laser cladding surface reinforcing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Cut the titanium alloy sample into a cuboid with a size of 30mm×10mm×10mm, and use a laser beam to clad Co42 cobalt-based self-fluxing alloy powder on its 30mm×10mm surface.

[0071] The specific process steps are as follows:

[0072] (1) Before laser cladding, clean the surface of the titanium alloy, wipe it clean and dry it.

[0073] (2) Co42 cobalt-based self-fluxing alloy powder is evenly adjusted into a paste;

[0074] (3) Apply the pasty mixture powder in (2) evenly on the titanium alloy surface, control the thickness at 0.8mm, and let it dry naturally;

[0075] (4) Adjust the laser current, adjust the power to 950W, protect the gas at 0.3MPa, and spot diameter 4mm. Keep the scanning speed at 5mm / s for laser cladding.

[0076] Purely using Co42 self-fluxing alloy as the cladding material, in the process of laser cladding, the droplet splashes seriously, which makes the surface of the cladding layer appear wavy after cladding, such as figure 1 shown. Under the...

Embodiment 2

[0080] Cut the titanium alloy sample into a cuboid with a size of 30mm×10mm×10mm, and use a laser to cut the mass percentage into Co42 cobalt-based self-fluxing alloy powder accounting for 80%, B 4 C accounts for 20% mixed powder cladding on its 30mm×10mm surface.

[0081] The specific process steps are as follows:

[0082] (1) Before laser cladding, clean the surface of the titanium alloy, wipe it clean and dry it.

[0083] (2) the above mass ratio of Co42, B 4 C mixture powder is evenly adjusted into a paste;

[0084] (3) Apply the pasty mixture powder in (2) evenly on the surface of the titanium alloy, keep the thickness uniform, and let it dry naturally;

[0085] (4) Adjust the laser current, adjust the power to 950W, protect the gas at 0.5MPa, and spot diameter 4mm. Keep the scanning speed at 5mm / s for laser cladding.

[0086] After laser cladding, the cladding surface is relatively smooth, such as Image 6 shown.

[0087] Figure 7 , Figure 8 is to add B 4 C w...

Embodiment 3

[0093] Cut the titanium alloy sample into a cuboid with a size of 30mm×10mm×10mm, and use a laser to cut the mass percentage into Co42 cobalt-based self-fluxing alloy powder accounting for 90%, B 4 C accounts for 10% mixed powder cladding on its 30mm×10mm surface.

[0094] The specific process steps are as follows

[0095] (1) Before laser cladding, clean the surface of the titanium alloy, wipe it clean and dry it.

[0096] (2) the above mass ratio of Co42, B 4 C mixture powder is evenly adjusted into a paste;

[0097] (3) Apply the pasty mixture powder in (2) evenly on the surface of the titanium alloy, keep the thickness uniform, and let it dry naturally;

[0098] (4) Adjust the laser current, adjust the power to 950W, protect the gas at 0.3MPa, and spot diameter 4mm. Keep the scanning speed at 5mm / s for laser cladding.

[0099] After laser cladding, the surface hardness and wear resistance of the sample are significantly improved, such as Figure 10 , Figure 11 show...

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Abstract

The invention relates to a titanium alloy laser cladding surface reinforcing method which comprises the following steps: mixing the following components by weight: 50-100% of Co42 cobalt-based self-fluxing alloy powder, 0-50% of B4C0, 0-50% of SiC, 0-39% of TiN, 0-1.5% of Y2O and 0-1.5% of CeO2, uniformly blending the mixture powder into paste by using a sodium silicate solution, uniformly coating the paste mixture powder on the surface of a titanium alloy, keeping the coating uniform in thickness, drying in air naturally, and performing laser cladding on the coating on the surface of the titanium alloy. By the adoption of the method provided by the invention, the microstructure of a cladding layer can be improved, and the hardness and the wear-resistance of the cladding layer can be further improved.

Description

technical field [0001] The invention relates to a surface strengthening method of laser cladding on the surface of titanium alloy, in particular to a method of adding Co42 self-fluxing alloy and B to the cladding layer. 4 C, SiC, TiN and other ceramic hard phases, and by adding rare earth oxide Y 2 o 3 , CeO 2 A modified surface strengthening method belongs to the technical field of material surface strengthening. Background technique [0002] Due to the advantages of high specific strength, high specific modulus and excellent corrosion resistance, titanium alloys have been widely used in aerospace and other fields. However, the wear resistance of titanium alloy is poor, which limits its application in the industrial field. As a surface modification technology, laser cladding technology is an effective way to improve the performance of titanium alloy surface such as wear resistance and high temperature oxidation resistance. [0003] Laser cladding technology uses a lase...

Claims

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Application Information

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