Coating preparing method and device by mixing metal and plastic powders

A technology of metal powder and powder, which is applied in the field of preparation of metal composite coatings, and achieves the effect of low cost, high efficiency and simple method

Inactive Publication Date: 2010-07-07
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And the method for preparing metal and plasti

Method used

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  • Coating preparing method and device by mixing metal and plastic powders
  • Coating preparing method and device by mixing metal and plastic powders

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example 1

[0027] The composite coating prepared by the metal and plastic powder prepared in this embodiment is an anti-corrosion coating Al-polytetrafluoroethylene system. The powder used is a mixed powder of Al and PTFE, the weight ratio of Al and PTFE is 3:1, and the substrate It is aluminum alloy. The spraying process parameters are as follows: the spray distance is 40mm; the gas pressure is 1.8MPa; among the two compressed gases, the temperature of the gas entering the powder feeder is room temperature, and the temperature of the gas after entering the heater is 200℃; the air flow of the two compressed gases is 30g / s; the average particle size of metal or plastic powder is 5 microns. As a result, an Al-PTFE coating was obtained. Observed by scanning electron microscopy, the Al-PTFE two-phase distribution was uniform and no segregation occurred. figure 2 .

Example Embodiment

[0028] Example 2

[0029] The difference from Example 1 is:

[0030] The metal and plastic composite coating prepared in this embodiment is a sealed coating Pb-polyphenylene sulfide powder system, 45 steel is used as the substrate, and the coating materials used are Pb and polyphenylene sulfide powder, and Pb and polyphenylene sulfide The weight ratio is 2:1, and the spraying process parameters are as follows: spray distance 20mm; gas pressure 2.0MPa; among the two compressed gases, the temperature of the gas entering the powder feeder is room temperature, and the temperature of the gas after entering the heater is 180℃; The flow rate of the two compressed gases is 30g / s; the average particle size of metal or plastic powder is 50 microns. As a result, Pb and polyphenylene sulfide coatings were obtained. Observed by scanning electron microscope, the two-phase distribution of Pb and polyphenylene sulfide coatings was uniform and the structure was compact.

Example Embodiment

[0031] Example 3

[0032] The difference from Example 1 is:

[0033] The metal and plastic composite coating prepared in this embodiment is a seal coating Sn-polyimide system, the powder used is a mixed powder of pure aluminum and polyimide, and the weight ratio of pure aluminum and polyimide is 10 :1, the base material is copper alloy. The spraying process parameters are as follows: the spraying distance is 10mm; the gas pressure is 1.9MPa; among the two compressed gases, the temperature of the gas entering the powder feeder is room temperature, and the temperature of the gas after entering the heater is 240℃; the gas flow of the two compressed gases is 15g / s; the particle size of metal or plastic powder is 5-50 microns. As a result, a Sn-polyimide coating was obtained. Observed by scanning electron microscopy, the two-phase distribution of Sn-polyimide was uniform, and no polarization phenomenon appeared.

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Abstract

The invention relates to a preparing technology of metal composite coating, in particular to a coating preparing method and device by mixing metal and plastic powders. The aerodynamic spraying technology is adopted in the invention: metal and plastic powders are mixed; part of compressed air which carries powder when passes a powder feeder and gas preheated by a heater is mixed at an air inlet of a supersonic flow nozzle and then the mixed gas passes the nozzle to develop a gas-solid two-phase flow; solid particles in the gas-solid flow are sprayed on the surface of a workpiece and then develop serious plastic deformation and deposit on surface of the workpiece; and subsequent high kinetic energy particles repeat the above process to form alloy or coating. The method has the advantages of simple structure, low cost and high efficiency and can be applied to composite coating preparation. The device is provided with a high-pressure air source, the heater, the powder feeder, and the supersonic flow nozzle, wherein the high-pressure air source is connected with an air inlet pipe; and the air inlet pipe is connected with the supersonic flow nozzle through the powder feeder and the heater respectively. The device has the advantages of simple structure and strong practicability.

Description

technical field [0001] The invention relates to the preparation technology of a metal composite coating, in particular to a method and a device for preparing a coating by mixing metal and plastic powder. Background technique [0002] In the prior art, there are many methods for preparing coatings, and the prepared coatings include: metal coatings, ceramic coatings, metal-ceramic composite coatings, plastic coatings and the like. And the method for preparing metal and plastic composite coating has not been reported yet. Contents of the invention [0003] The purpose of the present invention is to provide a method for preparing composite coatings by mixing metal and plastic powders and its special device. This method can prepare composite coatings with different component ratios, and the metal and plastics in the coating are evenly distributed, and can be used in multiple coatings. The coating can be prepared directly on the base material of various materials, and the thick...

Claims

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Application Information

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IPC IPC(8): B05D1/12B05C19/04B05C19/06
Inventor 陶永山金花子孔令艳吴杰梁慎国崔新宇陶杰李铁藩熊天英
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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