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Preparation method of TC4 titanium alloy laser cladding reinforced coating

A laser cladding and titanium alloy technology, applied in the field of laser additive manufacturing, can solve the problems of inability to guarantee the service life of parts, low hardness, environmental pollution, etc., and achieve the effects of easy access, good wettability, and good toughness

Inactive Publication Date: 2018-02-23
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hardness of the existing TC4 titanium alloy laser cladding coating is not very high, and there will be a large number of cracks and pores, so the service life of the parts cannot be guaranteed under extremely severe abrasive wear conditions; in addition, laser cladding is commonly used The powder contains more chromium, so it is very easy to pollute the environment

Method used

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  • Preparation method of TC4 titanium alloy laser cladding reinforced coating
  • Preparation method of TC4 titanium alloy laser cladding reinforced coating
  • Preparation method of TC4 titanium alloy laser cladding reinforced coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The preparation method of the TC4 titanium alloy laser cladding enhanced coating provided in this embodiment includes the following steps in order:

[0025] Step 1: Use TC4 titanium alloy material as the substrate for cladding, polish the surface with 600-grit sandpaper, and then use acetone solution to remove oil and rust on the surface to pretreat the substrate;

[0026] Step 2: mix titanium carbide powder and TC4 titanium alloy powder uniformly with a mass ratio of 20:80 to make a mixed powder, and then spread a layer of mixed alloy powder on the surface of the above-mentioned pretreated substrate; the thickness of the mixed alloy powder layer 3mm;

[0027] Step 3: Using argon as a protective gas, the above-mentioned mixed alloy powder is clad on the surface of the substrate with a high-power semiconductor laser at a spot width of 6mm, a laser power of 1200W, a scanning speed of 3mm / s, and a focal length of 160mm, and then quickly Cool to form a layer of laser cladd...

Embodiment 2

[0030] The preparation method of the TC4 titanium alloy laser cladding enhanced coating provided in this embodiment includes the following steps in order:

[0031] Step 1: Use TC4 titanium alloy material as the substrate for cladding, polish the surface with 600-grit sandpaper, and then use acetone solution to remove oil and rust on the surface to pretreat the substrate;

[0032] Step 2: mix titanium carbide powder and TC4 titanium alloy powder with a mass ratio of 30:70 to make a mixed powder, and then spread a layer of mixed alloy powder on the surface of the above-mentioned pretreated substrate; the thickness of the mixed alloy powder layer 3.5mm;

[0033] Step 3: Using argon as a protective gas, cladding the above-mentioned mixed alloy powder on the surface of the substrate with a high-power semiconductor laser at a spot width of 10mm, laser power of 1200W, scanning speed of 3mm / s, and a focal length of 160mm, and then rapidly Cool to form a layer of laser cladding coatin...

Embodiment 3

[0036] The preparation method of the TC4 titanium alloy laser cladding enhanced coating provided in this embodiment includes the following steps in order:

[0037] Step 1: Use TC4 titanium alloy material as the substrate for cladding, polish the surface with 600-grit sandpaper, and then use acetone solution to remove oil and rust on the surface to pretreat the substrate;

[0038] Step 2: mix titanium carbide powder and TC4 titanium alloy powder uniformly with a mass ratio of 40:60 to make a mixed powder, and then spread a layer of mixed alloy powder on the surface of the above-mentioned pretreated substrate; the thickness of the mixed alloy powder layer 4mm;

[0039] Step 3: Using argon as a protective gas, cladding the above mixed alloy powder on the surface of the substrate with a high-power semiconductor laser at a spot width of 8mm, laser power of 1200W, scanning speed of 3mm / s, and a focal length of 160mm, and then quickly Cool to form a layer of laser cladding coating. ...

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Abstract

The invention provides a preparation method of a TC4 titanium alloy laser cladding reinforced coating. The preparation method comprises the steps that pretreatment is conducted on a base body; titanium carbide powder and TC4 titanium alloy powder are tiled on the surface of the base body; mixed alloy powder is clad on the surface of the base body by utilizing a high-power semiconductor laser, andthe like. The preparation method has the advantages that the alloy powder for laser cladding has both high hardness and the excellent abrasion resistance and the corrosion resistance; compared with other alloy powder, the TC4 titanium alloy powder has the good wettability, the corrosion resistance and the high-temperature self-lubricating effect, ingredients of the TC4 titanium alloy powder do notcontain chromium, and pollution to the environment in an experiment or production does not occur; titanium carbide not only is good in toughness, high in hardness and high in impact load resistance and abrasive particle abrasion ability, but also has good resistance to interfacial corrosion abrasion after being combined with base metal; and no cracks and pores exist in the combined area part of the laser cladding layer and the base body, and through experimental test, the strength of the laser cladding layer is high.

Description

technical field [0001] The invention belongs to the technical field of laser additive manufacturing, and in particular relates to a preparation method of a TC4 titanium alloy laser cladding enhanced coating. Background technique [0002] Wear is one of the three major ways (wear, corrosion, fracture) of metal mechanical parts failure. According to statistics, modern industry urgently needs parts that can work effectively under harsh wear conditions (such as high temperature, high-speed friction and wear, etc.). [0003] Laser cladding technology is an emerging part processing and surface modification technology. It has the advantages of low dilution rate, small heat-affected zone, metallurgical bonding with the base surface, small distortion and deformation of cladding parts, and easy automation of the process. The application of laser cladding technology to surface treatment can greatly improve the mechanical properties such as hardness, wear resistance, corrosion resistan...

Claims

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Application Information

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IPC IPC(8): C23C24/10
CPCC23C24/103
Inventor 张天刚孙荣禄刘亚楠
Owner TIANJIN POLYTECHNIC UNIV
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