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Method for preparing composite coating by using preset piece method to conduct laser multi-layer cladding

A multi-layer cladding and composite coating technology, which is applied in the coating, metal material coating process, etc., can solve the problem that the cladding layer cannot be prepared continuously, the cladding defects of the previous layer cannot be solved, and the pre-coating process cannot be controlled. Solve problems such as powder thickness to achieve the effect of low cost, high efficiency and wide application prospects

Active Publication Date: 2017-08-18
EAST CHINA JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the fact that the existing laser cladding method cannot continuously prepare multi-layer cladding layers during the cladding process, the test efficiency is low, the thickness of the preset powder cannot be controlled, and the defects of the previous layer of cladding defects "inherited" to the next layer cannot be solved. , the present invention provides a method for preparing multi-layer cladding layers that can be extended

Method used

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  • Method for preparing composite coating by using preset piece method to conduct laser multi-layer cladding
  • Method for preparing composite coating by using preset piece method to conduct laser multi-layer cladding
  • Method for preparing composite coating by using preset piece method to conduct laser multi-layer cladding

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Embodiment 1

[0038] The schematic diagram of the jig for making the preset sheet in the embodiment is as follows figure 1 shown.

[0039] The schematic diagram of replenishing powder in the embodiment is as figure 2 , image 3 shown.

[0040] A method for preparing a composite coating by laser multi-layer cladding with a preset chip method, comprising the steps of:

[0041] A. Pretreat the surface of the base material 1, clean off the rust, grease and dust on the surface of the workpiece, and dry it; first, use sandpaper to polish the surface of the base material 1 to remove oxidation or rust spots on the surface of the base material 1; then, use alcohol Clean the surface of the substrate 1 to remove surface dust. After the above two pretreatments, a clean and clean surface of the substrate 1 can be obtained.

[0042] B. Powder treatment: put the powder to be made into a pre-set in a vacuum drying oven, dry it at 80°C for 24 hours, spread it flat on the fixture groove plate 3 covered...

Embodiment 2

[0070] A method for preparing a composite coating by laser multi-layer cladding with a preset chip method, comprising the steps of:

[0071] A total of 100g of tin bronze powder with a volume fraction of 85% and 400 meshes and a total of 100g of spherical graphite powder with a volume fraction of 15% and 200 meshes were evenly mixed to prepare a 2mm thick preset sheet; then, the surface of the cladding substrate 1 was pretreated to obtain a clean and a clean surface; finally, place the preset sheet 2 on the substrate 1 for laser cladding, and keep the vertical distance between the cladding layer 7 and the laser head 9 unchanged for each cladding, and if a certain layer of cladding layer is uneven , make powder replenishment to make it flat before proceeding to the next layer of cladding. The laser head is a semiconductor laser head, 8 layers of cladding for each layer, 12 layers of cladding, laser power of 1100W, spot diameter of 2.2mm, overlapping rate of 50%, and scanning sp...

Embodiment 3

[0073] A method for preparing a composite coating by laser multi-layer cladding with a preset chip method, comprising the steps of:

[0074] 5g of carbon fiber, 20g of silicon carbide powder of 200 mesh, and 80g of nickel powder of 200 mesh are used to prepare a 1mm thick preset sheet; then, the surface of the cladding substrate 1 is pretreated to obtain a clean and clean surface; finally, the preset sheet 2. Place it on the base material 1 for laser cladding. Keep the vertical distance between the cladding layer 7 and the laser head 9 unchanged for each cladding. If a certain layer of cladding layer 7 is uneven, add powder to make it smooth Then proceed to the next layer of cladding. The laser head is a semiconductor laser head, 8 layers of cladding for each layer, 10 layers of cladding, laser power of 1000W, spot diameter of 2.2mm, overlapping rate of 50%, and scanning speed of 500mm / min. The surface of the obtained coating is smooth, the thickness of the coating is 8.5 mm,...

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Abstract

The invention belongs to the technical field of laser cladding high performance coatings and particularly relates to a method for preparing a composite coating by using a preset piece method to conduct laser multi-layer cladding. The method for preparing the composite coating by using the preset piece method to conduct laser multi-layer cladding comprises the following steps that A, the surface of a base material is preprocesses, corrosion oil dirt and dust on the surface of a workpiece are cleaned, and drying is conducted; B, powder processing is conducted, specifically, the powder to be prepared to be preset pieces is placed in a vacuum drying box, dried at the temperature of 80 DEG C for 24 h and laid flatly in a fixture groove flat plate provided with a T300 sloping grain carbon fiber cloth in a laid mode, and adhesion agent solutions are sprinkled uniformly to form a uniform water layer; C, the preset pieces preprocessed in the step B is placed in the vacuum drying box together with the groove flat plate, and vacuum heating and hardening is conducted at the temperature of 75-90 DEG C for 4 h; and D, laser cladding is conducted, specifically, the preset pieces prepared in the step C are placed in a base material set position, and multi-layer cladding is conducted under the protective atmosphere to enable the preset pieces to be combined with the base material to form a cladding layer with a certain thickness.

Description

technical field [0001] The invention belongs to the technical field of laser cladding high-performance coatings, and in particular relates to a method for preparing a composite coating by laser multilayer cladding with a preset chip method. Background technique [0002] Laser cladding is a new type of cladding technology, involving multiple disciplines such as optics, mechanics, electricity, materials, detection and control, and is one of the most important core technologies of advanced laser manufacturing technology. Because the cladding layer prepared by this technology can significantly improve the comprehensive properties of the substrate surface such as wear resistance, corrosion resistance, heat resistance, high temperature oxidation resistance and fatigue resistance, so as to achieve the purpose of surface modification or repair, which not only meets the specific needs of the material surface Performance requirements, but also save a lot of precious elements. Compare...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
CPCC23C24/10
Inventor 赵龙志吴浩赵明娟周颖张坚
Owner EAST CHINA JIAOTONG UNIVERSITY
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