High-speed gas-electric arc composite thermal spraying method and spray gun used in same

A thermal spraying and gas technology, applied in coating, spraying device, melting spraying and other directions, can solve the problem of high operating cost, and achieve the effect of high ignition energy, reliable ignition and efficient cooling

Active Publication Date: 2015-04-08
ACADEMY OF ARMORED FORCES ENG PLA
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AI Technical Summary

Problems solved by technology

These two composite spraying methods of high-speed gas and electric arc spraying both use the high-speed gas produced by the combustion of gas fuel and oxygen or air to accelerate the atomization of metal wires. Therefore, there are also many inconveniences in the transportation, storage and use of gas fuel. Higher operating costs when used as a combustion aid

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  • High-speed gas-electric arc composite thermal spraying method and spray gun used in same
  • High-speed gas-electric arc composite thermal spraying method and spray gun used in same
  • High-speed gas-electric arc composite thermal spraying method and spray gun used in same

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Embodiment Construction

[0022] The present invention proposes a kind of high-speed gas-electric arc composite thermal spraying method, and it comprises the following steps:

[0023]1) By means of air plasma ignition, the mixture of kerosene and compressed air is ignited to form an annular high-speed jet oil-gas mixed flow, and the speed of the jetted oil-gas mixed flow can reach more than 100m / s;

[0024] 2) Make the oil-gas mixed flow continue to fully burn and accelerate, forming a gas whose speed is more than 1 times the speed of sound, and then spray it to the wire;

[0025] 3) The wire is energized and melted by arcing, atomized and accelerated under the action of supersonic gas jet, and deposited on the surface of the part to be sprayed to form a coating to complete the thermal spraying operation.

[0026] In the above-mentioned thermal spraying method of the present invention, the combined cooling of water and compressed air can be used to lower the temperature of the combusted oil-air mixed f...

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Abstract

The invention discloses a high-speed gas-electric arc composite thermal spraying method and a spray gun used in the same. The thermal spraying method comprises the following steps: igniting an annular high-speed jet oil-gas mixed flow obtained by mixing kerosene and compressed air by virtue of an air plasma ignition manner; continuously burning the oil-gas mixed flow fully, accelerating to form a supersonic gas and then spraying to a wire material; and electrifying the wire material for arc starting and melting, atomizing and accelerating the wire material under the action of the supersonic gas jet flow, and depositing on the surface of a to-be-sprayed part to form a coating layer. On the basis of the thermal spraying method disclosed by the invention, the wire material subjected to arc melting can be used for realizing efficient spraying on the surface of the to-be-sprayed part under the action of the low-oxygen-content supersonic gas formed when the compressed air supports the combustion of kerosene, and an obtained spray coating layer is good in quality.

Description

technical field [0001] The invention relates to a high-speed gas-arc composite thermal spraying method and a spray gun used in the thermal spraying method, belonging to the technical field of thermal spraying. Background technique [0002] At present, a wide variety of metal-based and ceramic-based coating materials can be prepared by thermal spraying, so it is widely used to achieve dimensional recovery and surface modification of various substrate parts. Combustion is an important thermal spraying technology that generates high-speed gas acceleration and heats sprayed materials. According to the type of combustion aid, high-velocity gas spraying technology usually includes high-speed oxygen flame (HVOF) spraying with oxygen for combustion and high-velocity air flame (HVAF) spraying with air for combustion. According to the type of fuel, high-velocity gas spraying technology can be divided into Gas fuel, liquid fuel spraying technology. [0003] There are many suitable fu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/12B05B17/04
CPCB05B17/04C23C4/12
Inventor 陈永雄梁秀兵徐滨士
Owner ACADEMY OF ARMORED FORCES ENG PLA
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