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Laser cladding method for preparing cobalt-based alloy coating on surface of vermicular graphite cast iron

A cobalt-based alloy and laser cladding technology, applied in the field of laser cladding, can solve the problems of high processing precision, low bonding degree, easy to generate pores and slag inclusions, etc., and achieve high bonding degree, high red hardness, good durability hot effect

Inactive Publication Date: 2015-05-06
CIVIL AVIATION UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Existing methods for repairing failed iron castings include foundry glue, welding repair, etc., but they all have shortcomings such as low bonding, easy to generate pores and slag inclusions inside, and laser cladding can solve these problems well. At the same time, the process Can realize digital control, high processing precision
But at present, there are relatively few studies on laser cladding on the surface of cast iron, especially on the laser cladding of cobalt-based alloys on vermicular graphite cast iron. The method of cobalt-based alloy powder is more important

Method used

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  • Laser cladding method for preparing cobalt-based alloy coating on surface of vermicular graphite cast iron
  • Laser cladding method for preparing cobalt-based alloy coating on surface of vermicular graphite cast iron
  • Laser cladding method for preparing cobalt-based alloy coating on surface of vermicular graphite cast iron

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Choose vermicular graphite cast iron as the substrate for cladding, polish the surface with 600 mesh sandpaper, and then clean it with absorbent cotton dipped in isopropanone solution;

[0029] (2) Use a dryer to dry the cobalt-based alloy powder, the drying temperature is 120°C, and the drying time is 2 hours;

[0030] (3) Spread the above-mentioned dried cobalt-based alloy powder evenly on the surface of the substrate by means of preset powder, and the thickness of the preset powder is 1.5 mm;

[0031] (4) Use a high-power semiconductor laser to irradiate the above-mentioned preset powder with laser output power of 3000W, the selected spot width is 12mm×2mm, the focal length is 510mm, the scanning speed is 5mm / s, and the protective gas is argon Gas, so that the preset powder and the surface layer of the substrate are melted at the same time, thereby forming a layer on the surface of the substrate such as figure 1 The cobalt-based alloy coating shown.

Embodiment 2

[0033] (1) Choose vermicular graphite cast iron as the substrate for cladding, polish the surface with 600 mesh sandpaper, and then clean it with absorbent cotton dipped in isopropanone solution;

[0034] (2) Use a dryer to dry the cobalt-based alloy powder, the drying temperature is 120°C, and the drying time is 2 hours;

[0035] (3) Spread the above-mentioned dried cobalt-based alloy powder evenly on the surface of the substrate by means of preset powder, and the thickness of the preset powder is 1.5mm;

[0036] (4) Use a high-power semiconductor laser to irradiate the above-mentioned preset powder with laser output power of 3000W, the selected spot width is 12mm×2mm, the focal length is 510mm, the scanning speed is 8mm / s, and the protective gas is argon Gas, so that the preset powder and the surface layer of the substrate are melted at the same time, thereby forming a layer on the surface of the substrate such as figure 2 The cobalt-based alloy coating shown.

Embodiment 3

[0038] (1) Choose vermicular graphite cast iron as the substrate for cladding, polish the surface with 600 mesh sandpaper, and then clean it with absorbent cotton dipped in isopropanone solution;

[0039] (2) Use a dryer to dry the cobalt-based alloy powder, the drying temperature is 120°C, and the drying time is 2 hours;

[0040] (3) Spread the above-mentioned dried cobalt-based alloy powder evenly on the surface of the substrate by means of preset powder, and the thickness of the preset powder is 1.5 mm;

[0041] (4) Use a high-power semiconductor laser to irradiate the above-mentioned preset powder with laser output power of 3000W, the selected spot width is 12mm×2mm, the focal length is 510mm, the scanning speed is 11mm / s, and the protective gas is argon Gas, so that the preset powder and the surface layer of the substrate are melted at the same time, thereby forming a layer on the surface of the substrate such as image 3 The cobalt-based alloy coating shown.

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Abstract

The invention relates to a laser cladding method for preparing a cobalt-based alloy coating on the surface of vermicular graphite cast iron. The laser cladding method comprises the following steps: selecting the vermicular graphite cast iron as a matrix for cladding and polishing the surface of the vermicular graphite cast iron to be bright and clean and cleaning; drying cobalt-based alloy powder by using a drier; uniformly paving the dried cobalt-based alloy powder on the surface of the matrix by adopting the way of presetting powder; performing laser irradiation on the preset powder by using a high-power semiconductor laser to simultaneously fuse the preset powder and the surface of the matrix so as to form the cobalt-based alloy coating on the surface of the matrix. The laser cladding method has the advantages that the coating has higher hardness and has good wear resistance and corrosion resistance under the high-temperature working environment; included residues or air bubbles are not formed inside the coating, and the bonding degree of the cladding layer and the matrix is high; the selected cobalt-based alloy powder has higher contents of carbon, chromium and tungsten and has the advantages of good heat resistance, corrosion resistance, high red hardness and the like.

Description

technical field [0001] The invention belongs to the technical field of laser cladding, in particular to a laser cladding method for preparing a cobalt-based alloy coating on the surface of vermicular graphite cast iron. Background technique [0002] Vermicular graphite cast iron is a new type of cast iron material developed in recent decades. It is a cast iron obtained by modifying molten iron and inoculating it. The microstructure of vermicular graphite iron consists of a metal matrix and vermicular graphite. Because of its good thermal conductivity, castability and machinability, it is mainly used for some iron castings subjected to thermal cycle loads, such as steel ingot molds, glass molds, automobile engines, exhaust pipes, brake parts, etc. [0003] However, in the actual production and use process, the surface of cast iron parts is easy to affect its service life due to wear and corrosion. Adding a layer of alloy coating on the surface of cast iron can enhance the w...

Claims

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Application Information

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IPC IPC(8): C23C24/10
CPCC23C24/106
Inventor 王涛姚有才唐杰王浩
Owner CIVIL AVIATION UNIV OF CHINA
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