Electric-field-assisted arc spraying device and method
An electric arc spraying and electric field assisted technology, which is applied in the direction of coating, molten spraying, metal material coating process, etc., can solve the problems of affecting the service life of parts, inclusion of small pores, and easy cracks, etc., to achieve the reduction of pores, spraying The effect of rule concentration and precision reduction
Active Publication Date: 2021-07-09
NINGBO UNIV
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Problems solved by technology
In addition, since this molding method is to spray molten droplets to the workpiece, the coating formed by the small droplets on the workpiece is not concentrated when it is only driven by the high-speed airflow, and the small droplets will form a stack on the surface of the workpiece. The lamellar structure, which will make the middle part of the coating include small pores, cracks and oxides, etc.
When such parts are in service, they are prone to cracks and peeling under the action of friction, alternating loads and other forces, which seriously affect the service life of the parts
Method used
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Embodiment
[0038] The electric field assisted arc spraying device of the present embodiment is as figure 2 shown, including:
[0039] Two tungsten electrodes 2 respectively connected to the positive and negative poles of the arc power source 1 for generating the arc 8;
[0040] The electric field power supply 4, its positive pole is connected to the conductive tip 11 through the conductive block 10, and the negative pole is connected to the substrate 6, for generating an auxiliary electric field between the conductive tip 11 and the substrate 6;
[0041] The wire feeding roller 9 is used to transport a single metal wire 3 so that it passes through the conductive tip 11 and then melts at the arc 8 to form a charged droplet;
[0042]The air pump 5 can generate a high-speed airflow at the air nozzle 7 connected thereto, and the charged liquid droplets are atomized and accelerated to the substrate 6 under the double action of the auxiliary electric field and the high-speed airflow to form ...
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Abstract
The invention discloses an electric-field-assisted arc spraying device and method. The device comprises two tungsten electrodes, an electric field power supply, wire feeding rollers and an air pump, wherein the tungsten electrodes are connected with the positive and negative electrodes of an arc power supply respectively and used for generating an arc, the electric field power supply of which the positive and negative electrodes are connected with a contact tube and a substrate respectively is used for generating an assistant electric field between the contact tube and the substrate, the wire feeding rollers are used for conveying a single metal wire so that the metal wire can be electrified through the contact tube and then fused at the arc to form electrified droplets, the air pump is used for generating high-speed airflow, and the electrified droplets are atomized and sprayed to the substrate in an accelerated mode to form a coating under the dual action of the assistant electric field and the high-speed airflow. The method which adopts the device comprises the steps that the single metal wire conveyed by the wire feeding rollers is electrified through the contact tube and then fused at the arc generated by the two tungsten electrodes to form the electrified droplets, and the electrified droplets are atomized and sprayed to the substrate in an accelerated mode to form the coating under the dual action of the assistant electric field between the contact tube and the substrate and the high-speed airflow generated by the air pump.
Description
technical field [0001] The invention relates to the technical field of arc spraying, in particular to an electric field assisted arc spraying device and method. Background technique [0002] Arc spraying is a material surface forming technology that uses an electric arc as a heat source to melt a metal wire into a molten state, and then atomizes it into small droplets by a high-speed gas, and sprays it on the workpiece to form a coating. There are many reports at present, such as the patented technology of CN110791724A as the publication number. Arc spraying requires high-speed airflow during the spraying process, and the noise pollution caused by the sound of the air pump cannot be underestimated. In addition, since this molding method is to spray molten droplets to the workpiece, the coating formed by the small droplets on the workpiece is not concentrated when it is only driven by the high-speed airflow, and the small droplets will form a stack on the surface of the work...
Claims
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IPC IPC(8): C23C4/131
CPCC23C4/131
Inventor 方凯连信宇所新坤
Owner NINGBO UNIV