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Electrical contact strengthening apparatus and method for improving binding force of coating and workpiece

A strengthening device and electrical contact technology, which is applied in the direction of metal material coating process, coating, gaseous chemical plating, etc., can solve the problems of high porosity and poor uniformity of the strengthening layer, and achieve the effect of improving the bonding ability

Active Publication Date: 2009-04-15
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reinforced layer has high porosity and poor uniformity

Method used

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  • Electrical contact strengthening apparatus and method for improving binding force of coating and workpiece
  • Electrical contact strengthening apparatus and method for improving binding force of coating and workpiece
  • Electrical contact strengthening apparatus and method for improving binding force of coating and workpiece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A 316 stainless steel coating with a thickness of 0.2mm is sprayed on a 45 steel bar with a diameter of 35mm. On the self-developed electrical contact strengthening device, the part is first rotated at a speed of 1 revolution / 70 seconds, and the tungsten copper with a diameter of 100mm The electrode is in contact with the part to achieve relative movement, and a pressure of 500N is applied to the part to be strengthened, and then a current of 18KA is passed. Under the action of the electrode pressure, the heat generated when the contact resistance flows through the pulse current is used to melt the coating and the substrate Diffusion, and finally achieved the purpose of metallurgical bonding.

Embodiment 2

[0036] Spray a WC-Co coating with a thickness of 0.2mm on a 45 steel bar with a diameter of 35mm, and first make the part rotate at a speed of 1 revolution / 90 seconds on the self-developed electrical contact strengthening device, and the tungsten with a diameter of 100mm The copper electrode realizes relative motion through contact with the parts, applies a pressure of 600N to the strengthened parts, and then passes a current of 19KA. Under the action of the electrode pressure, the heat generated when the contact resistance flows through the pulse current is used to make the coating and the substrate generate heat. Melting diffusion achieves the purpose of metallurgical bonding.

Embodiment 3

[0038] Spray a 316 stainless steel coating with a thickness of 0.2mm on a white cast iron substrate with a diameter of 35mm. First, the parts are rotated at a speed of 1 revolution / 8 seconds on the self-developed electrical contact strengthening device. The 100mm tungsten copper electrode realizes relative movement by contacting with the parts. Under the action of electrode pressure, the heat generated when the contact resistance flows through the pulse current is used to melt and diffuse the coating and the substrate, achieving the purpose of metallurgical bonding.

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Abstract

The invention relates to a method and a device which strengthen a thermal spraying coating with large pulse current. The method can greatly improve the binding ability of the thermal spraying coating with a matrix and cause the coating to be changed to metallurgical bonding from mechanical jogging. The method is characterized in that large pulse current of 10 to 19KA is mainly supplied by power source; the strengthened coating is in direct contact with electrodes, turns relatively and cools down the cooling liquid of the contact part; under the pressure of the electrodes, the heat which is produced when contact resistance flows through the pulse current is used by the coating of the part surfaces for the melting diffusion of the coating and matrix to achieve the purpose of metallurgical bonding.

Description

technical field [0001] The invention belongs to the technical field of large pulse current strengthening of various conductive coatings, in particular to an electrical contact strengthening device and method for improving the bonding force between coatings and workpieces. Background technique [0002] There are many ways to form a coating on the surface of a workpiece, such as spraying, electroplating, vapor deposition, etc., but in many cases, a mechanical and physical bond is formed between the coating and the workpiece, and the bonding force between the coating and the workpiece is weak. It is easy to peel off and affect the service life. [0003] At present, the related electrical contact strengthening surface research mainly focuses on the following aspects: [0004] One is the transient electric energy surface strengthening method represented by the ultra-high temperature structural composite material laboratory of Northwestern Polytechnical University. It uses the di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/18C23C24/10C25D5/48C23C14/58C23C16/56
Inventor 朱世根王亚林
Owner DONGHUA UNIV