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Preparation method of laser fusion covered nickel base nanometer WC/Co precoating layer

A technology of laser cladding and pre-coating, which is applied in the direction of coating, device for coating liquid on the surface, pre-treatment of the surface, etc., which can solve the problems of easy generation of pores in the adhesive, difficult to control the temperature of thermal spraying, and high cost.

Inactive Publication Date: 2006-06-14
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation methods of laser cladding pre-coating include thermal spraying, adhesive and direct powder spraying, etc., but the temperature of thermal spraying is difficult to control, the device of direct powder spraying is more expensive, and the existing binder is easy to produce pores

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The ratio of dehydrated alcohol and shellac is 20:1 by weight and is formulated into binder, adds 0.1 milliliter of described binder and mixes described nickel base by every gram of described nickel base nano WC / Co powder Nano-WC / Co powder and the above-mentioned binder are fully stirred to make a pre-coated glue, and a pre-coated layer is prepared on the surface of No. 45 steel with a layer thickness of about 0.5 mm. Let it dry naturally, and then use CO 2 The laser is used for laser cladding, and the power density of laser cladding is 1.19×10 4 W / cm 2 , The scanning speed is 5mm / s.

Embodiment 2

[0017] The ratio of dehydrated alcohol and shellac is 10:1 by weight and is formulated into binder, adds 0.25 milliliter described binder and mixes described nickel base by every gram of described nickel base nanometer WC / Co powder Nano-WC / Co powder and the above-mentioned binder are fully stirred to make a pre-coated glue, and a pre-coated layer is prepared on the surface of No. 45 steel with a layer thickness of about 0.5 mm. Let it dry naturally, and then use CO 2 The laser is used for laser cladding, and the power density of laser cladding is 1.19×10 4 W / cm 2 , The scanning speed is 5mm / s.

Embodiment 3

[0019] The ratio of dehydrated alcohol and shellac is 15:1 by weight and is formulated into binding agent, adds 0.2 milliliter described binding agent and mixes described nickel-based nanometer WC / Co powder by every gram Nano-WC / Co powder and the above-mentioned binder are fully stirred to make a pre-coated glue, and a pre-coated layer is prepared on the surface of No. 45 steel with a layer thickness of about 0.5 mm. Let it dry naturally, and then use CO 2 The laser is used for laser cladding, and the power density of laser cladding is 1.19×10 4 W / cm 2 , The scanning speed is 5mm / s.

[0020] The composite coatings coated on the surface of No. 45 steel in Examples 1, 2 and 3 were tested, and the results showed that the treated surface was smooth, dense, cracks and pores were basically eliminated, and it was metallurgically bonded with the substrate.

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PUM

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Abstract

The invention relates to laser melting-covering nickel base nanometer WC / Co precoating manufacturing method. It includes the following steps: weighting lac absolute ethyl alcohol in proportion of 1:10-20; adding the lac into the absolute ethyl alcohol; weighting and mixing nickel base nanometer WC / Co powder and bonding agent in proportion of 1g: 0.1mL-0.25mL; fully stirring to form precoat agent; coating the precoat agent at the workpiece surface to form precoating; drying. The prepared nickel base nanometer WC / Co precoating is adopted laser melting-covering technique to form nickel base nanometer WC / Co composite coating.

Description

technical field [0001] The invention relates to the modification treatment of the surface of steel components such as stainless steel, in particular to a preparation method of a laser cladding nickel-based nanometer WC / Co precoat. Background technique [0002] Laser surface modification technology has a history of more than 20 years, and great progress has been made in various aspects, but the current promotion of laser surface strengthening technology has not achieved the desired effect. The main reason is that the quality of laser surface alloying and laser cladding layer is not easy to control, and defects such as cracks and pores often appear in the coating. Nano-ceramic refers to the microstructure in which the grains, grain boundaries and their combination are all at the nanometer level. Due to the refinement of the grains, the number of grain boundaries is greatly increased, which can greatly improve the strength, toughness and plasticity of the material. It has an i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/08B05C1/00B05D3/04
Inventor 王慧萍张光钧戴建强邹昌谷奚文龙
Owner SHANGHAI UNIV OF ENG SCI
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