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Method for obtaining composite coating by means of laser cladding of extrusion preset powder

A composite coating and pre-powder technology, which is applied in the field of laser cladding to obtain surface composite coating and laser cladding to obtain composite coating, can solve the problems of low coating quality and low powder utilization rate, and achieve simple process , high powder utilization and low cost

Inactive Publication Date: 2015-01-28
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the defects that the existing laser cladding technology is difficult to meet the preparation of composite coatings, low powder utilization rate and low coating quality in the cladding process, the present invention provides a scalable powder coating with high powder utilization rate and applicability to powder types and powder particle sizes. A method for obtaining a composite coating by laser cladding with a strong extrusion pre-powder method

Method used

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  • Method for obtaining composite coating by means of laser cladding of extrusion preset powder
  • Method for obtaining composite coating by means of laser cladding of extrusion preset powder
  • Method for obtaining composite coating by means of laser cladding of extrusion preset powder

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Effect test

Embodiment 1

[0035] A. Treat the surface of the square base material that needs cladding composite coating: depending on the surface roughness of the base material, perform traditional grinding treatment on it and then clean it with acetone and absolute ethanol to achieve the purpose of degreasing and derusting ;

[0036] B. Powder treatment: put the powder to be clad composed of B and Ti in a vacuum drying oven and dry it at 110°C for 24 hours, and then use polyethylene with a mass percentage concentration of 3% which accounts for 5% of the total mass of the preset layer Alcohol aqueous solution is used as a binder to uniformly mix the powder to be clad into a paste, and use figure 1The extrusion device shown puts the powder to be clad into the extrusion cavity, and pushes the extrusion rod 1a to make the extrusion piston 1b extrude it in the form of a strip (the cross-sectional shape is circular) and preset it on the base material. Surface: Preset one strip on the surface of the substra...

Embodiment 2

[0040] A. Treat the surface of the cylindrical substrate that needs to be clad with a composite coating: depending on the surface roughness of the substrate material, perform special processing and then clean it with acetone and absolute ethanol to achieve the purpose of removing oil and rust ;

[0041] B. Powder treatment: will be made of Al 2 o 3 The cladding powder composed of Ti and Ti was placed in a vacuum drying oven and dried at 100°C for 30 hours, and then the polyvinyl alcohol aqueous solution with a mass percentage concentration of 8% was used as a binder, which accounted for 10% of the total mass of the preset layer. The powder to be clad is evenly mixed and blended into a paste, and used figure 1 The extrusion device shown puts the powder to be clad into the extrusion chamber, and pushes the extrusion rod 1a to make the extrusion piston 1b extrude it in strip form (trapezoidal in cross section) and preset it on the surface of the substrate ; Preset one strip on...

Embodiment 3

[0045] A. Treat the surface of the complex curved cylindrical substrate that needs cladding composite coating: depending on the surface roughness of the substrate material, it is cleaned with acetone and absolute ethanol after special processing to achieve degreasing and rust removal the goal of;

[0046] B. Powder treatment: Put the powder to be clad composed of Ni60 and TiC in a vacuum drying oven and dry it at 120°C for 36 hours, and then use titanium dioxide sol accounting for 2% of the total mass of the preset layer as a binder to melt Cover the powder and mix evenly to form a paste, and use figure 1 The extrusion device shown puts the powder to be clad into the extrusion cavity, and pushes the extrusion rod 1a to make the extrusion piston 1b extrude it in strip form (the cross-sectional shape is rectangular) and preset it on the surface of the substrate ; Preset one strip on the surface of the substrate first, then perform the operations of steps C and D, then preset an...

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Abstract

The invention relates to a method for obtaining a composite coating by means of laser cladding of extrusion preset powder. The method includes uniformly mixing cladding powder materials into paste or cream by the aid of prepared adhesive liquor; then presetting the paste or cream on the surface of a substrate material in an extrusion manner; naturally drying the paste or cream on the surface of the substrate material or placing the paste or cream on the surface of the substrate material in a vacuum drying tank for drying, and forming a preset layer; and finally realizing laser cladding so that the preset layer is in metallurgical bonding with the substrate material, and obtaining the required composite coating. The method has the advantages of wide application range, high powder utilization rate, low cost, simple process, simplicity and convenience in control, and the like. In addition, the method not only is applicable to laboratory research of laser cladding composite coatings, but also is applicable to fields of laser cladding composite coatings on surfaces of metal parts with complicated shapes and high technical requirements.

Description

technical field [0001] The invention relates to a method for obtaining a composite coating by laser cladding by presetting powder by an extrusion method, in particular to a method for obtaining a surface composite coating by using mixed powder as a raw material for laser cladding, which belongs to the high-performance laser cladding coating. The field of coating technology. Background technique [0002] After more than 30 years of development, laser cladding technology has become one of the key technologies for preparing composite coatings with the reduction of laser manufacturing costs and the potential application of high-power lasers in material processing. [0003] Laser cladding technology usually introduces the elemental or compound powder prepared in a certain proportion directly into the laser molten pool to obtain a composite coating. According to the introduction method of powder materials, it can be divided into preset method and synchronous powder feeding method...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10
Inventor 张晓伟刘洪喜蒋业华
Owner KUNMING UNIV OF SCI & TECH
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