Electrical explosion spraying method for powder

A technology of electric explosion and powder, which is applied in the direction of coating, fusion spraying, metal material coating process, etc., can solve the problems of limited spraying area, high processing cost, low work efficiency, etc., and achieve the expansion of application field and wide spraying area , high work efficiency

Inactive Publication Date: 2013-05-15
NINGBO UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the transient high temperature and high pressure characteristics of the metal electric explosion process and the shock wave effect accompanying the explosion products, compared with the traditional thermal spraying technology, it has the advantages of fast spraying speed, high coating bonding strength, low porosity, and controllable parameters, and can Form micro-crystalline and nano-crystalline structures; however, because this method needs to design the composition of the sprayed material and then cast the ingot, and then process the sprayed material into wire / foil, the processing cost is high, difficult, and the cycle is long, and in principle , the electric explosion technology can only be applied to conductive metal materials, and the electric explosion method cannot be used for spraying non-metallic materials under normal conditions, so the spraying materials are limited, which leads to the limitation of its spraying field
In addition, the spraying material is processed into wire / foil, and the spraying area is very limited every time the electric explosion spraying is performed, and the work efficiency is relatively low

Method used

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  • Electrical explosion spraying method for powder
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  • Electrical explosion spraying method for powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment one: a kind of electric explosion spraying method of powder, comprises the following concrete steps:

[0026] (1) Surface treatment such as pickling, sandblasting or ultrasonic cleaning of the sprayed workpiece;

[0027] (2) At least one priming wire 7 is pre-embedded between the two electrodes 5 of the spraying device, and the gap between the two electrodes 5 is filled with spraying powder 6, and then the priming wire 7 is fixedly connected to the electrode , and connect the electrode 5 with a pulsed large current generating circuit (not shown in the figure);

[0028] (3) Put the cleaned sprayed workpiece into the spraying device, and connect the pulse high current generating circuit to perform electric explosion spraying on the sprayed workpiece.

[0029] The specific structure of the spraying device used in step (1) of the first embodiment above is as follows: as shown in the figure, the spraying device includes a metal support 1 with an open lower end an...

Embodiment 2

[0030] Embodiment 2: Other methods are the same as in Embodiment 1, except that the detonating metal foil 7' is used to replace the detonating wire 7, and the connection structure between the detonating metal foil 7' and the electrode 5 in the spraying device used in step (1) The two ends of the insulating sleeve 4 are respectively provided with metal connecting pipes 42, the electrodes 5 are arranged in the metal connecting pipes 42, the detonating metal foil 7' penetrates into the metal connecting pipes 42 and is located on the bottom surface of the metal connecting pipes 42 and the electrodes. 5, the electrode 5 is provided with a positioning boss 51, the electrode 5 is sleeved with a metal connecting sleeve 53, the metal connecting sleeve 53 is placed on the positioning boss 51, and the metal connecting sleeve 53 is screwed to the metal connecting pipe 42. An insulating connecting sleeve 52 is sheathed on the outer side of the metal connecting sleeve 53 , and the insulating...

Embodiment 3

[0032] Embodiment 3: Other methods are the same as Embodiment 1 or 2, the difference is that in the step (3) of Embodiment 1 or 2, before turning on the pulse large current generating circuit, the spraying device is placed in the sealed cabin, According to the needs of the coating performance, inert gas is filled in the sealed cabin or the sealed cabin is evacuated, and the pressure in the sealed cabin is controlled, and then the pulse high current generating circuit is connected to perform electric explosion spraying on the workpiece.

[0033] The airtight cabin used in above-mentioned embodiment three comprises cabin body 9 and hatch door 91, is provided with sealing strip 92 between cabin body 9 and hatch door 91, is provided with the workbench 93 that is used to install spraying device in the cabin body 9, the cabin body 9 is provided with inflation hole 94 and exhaust hole 95, and the outer surface of cabin body 9 is provided with pressure gauge 96.

[0034]In all above-m...

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Abstract

The invention discloses an electrical explosion spraying method for powder. The method is characterized by comprising the following steps of: carrying out acid pickling, sand blasting or ultrasonic cleaning treatment on the surface of a spraying workpiece; pre-embedding an ignition metal foil or at least one ignition metal wire between two electrodes of a spraying device; fully filling spraying powder between the two electrodes; fixedly connecting the ignition metal foil or the ignition metal wire with an electrode; connecting the electrode with a pulse heavy-current generation circuit; placing the cleaned workpiece into the spraying device; and connecting with the pulse heavy-current generation circuit for electrical explosion spraying. The electrical explosion spraying method has the advantages that the selection range for spraying powder is wider; components of the spraying material can be selected according to performances of a coating; meanwhile, the electrical explosion sprayingmethod can be used for electrical explosion spraying for non-conducting powder (such as non-conducting ceramic powder), thus the application field of electrical explosion spraying is greatly widened.

Description

technical field [0001] The invention relates to a powder spraying method, in particular to a powder electric explosion spraying method. Background technique [0002] The application and development of modern high technology in industrial manufacturing and electronics industry put forward higher performance requirements for coatings, including wear resistance, corrosion resistance, heat resistance, high hardness, coating size control and bonding strength between coating and base material Wait. [0003] At present, electric explosion spraying is to apply DC high voltage (above several thousand volts) instantaneously to both ends of the metal conductor (wire, foil), and conduct ohmic heating on the metal wire (foil) until it explodes, forming instantaneous high-temperature, high-pressure metal vapor at high speed. Spray onto the substrate and form a sprayed coating after rapid solidification. Due to the transient high temperature and high pressure characteristics of the meta...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C23C4/12C23C4/126
Inventor周刚毅董新龙刘军樊康荣
OwnerNINGBO UNIV