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Metal workpiece double layer coating suitable for high temperature environment and manufacturing method thereof

A metal workpiece, double-layer coating technology, applied in the direction of metal material coating process, coating, fusion spraying, etc., to achieve the effect of changing mechanical properties and reducing high cost

Active Publication Date: 2019-01-25
GUANGDONG POLYTECHNIC NORMAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN102146563A discloses an intelligent temperature-regulating rail production process with a laser cladding layer and a heat-insulating coating. The technical proposal uses a spraying method or a brushing method to coat the first layer of anti-corrosion, sunscreen, and cooling paint coating on the surface of the rail, and then coats The second layer of sun protection and heat insulation coating, this cold coating is not suitable for high temperature environments exceeding 800 °C

Method used

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  • Metal workpiece double layer coating suitable for high temperature environment and manufacturing method thereof
  • Metal workpiece double layer coating suitable for high temperature environment and manufacturing method thereof
  • Metal workpiece double layer coating suitable for high temperature environment and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The sample preparation method of embodiment 1 is as follows:

[0043] (1) Mechanical (or chemical) treatment of the workpiece surface

[0044] Put the steel workpiece in a beaker filled with degreasing liquid, and put it into an ultrasonic field at a frequency of 30kHz to degrease. Then put it into the sandblasting machine for coarsening, adjust the working pressure of the compressed air of the sandblasting machine at 0.7MPa, the spray angle is controlled at 50°, the distance between the nozzle and the working surface is controlled at 150mm, and the surface roughness of the workpiece after sandblasting is 80μm . Then put it into the ultrasonic field at a frequency of 30kHz and clean it again.

[0045] (2) Thermal spraying on the surface of the workpiece

[0046]Preheat the pretreated workpiece to 200°C, and use atmospheric plasma spraying equipment to spray the inner layer of zirconia ceramics on the surface of the workpiece. The parameters for spraying the inner lay...

Embodiment 2

[0052] The sample preparation method of embodiment 2 is as follows:

[0053] (1) Mechanical (or chemical) treatment of the workpiece surface

[0054] Put the steel workpiece in a beaker filled with degreasing liquid, and put it into an ultrasonic field at a frequency of 40kHz to degrease. Then put it into the sandblasting machine for coarsening, adjust the working pressure of the compressed air of the sandblasting machine at 0.4MPa, the spray angle at 30°, the distance between the nozzle and the working surface at 100mm, and the surface roughness of the workpiece after sandblasting at 100μm . Then put it into the ultrasonic field at a frequency of 40kHz and clean it again.

[0055] (2) Thermal spraying on the surface of the workpiece

[0056] Preheat the pretreated workpiece to 200°C, and use atmospheric plasma spraying equipment to spray the inner layer of zirconia ceramics on the surface of the workpiece. The parameters for spraying the inner layer of zirconia ceramics ar...

Embodiment 3

[0062] The sample preparation method of embodiment 3 is as follows:

[0063] (1) Mechanical (or chemical) treatment of the workpiece surface

[0064] Put the nickel alloy workpiece in a beaker filled with degreasing liquid, and put it into an ultrasonic field at a frequency of 35kHz to degrease. Then put it into the sandblasting machine for coarsening, adjust the working pressure of the compressed air of the sandblasting machine at 0.8MPa, the spray angle is controlled at 60°, the distance between the nozzle and the working surface is controlled at 200mm, and the surface roughness of the workpiece after sandblasting is 60μm . Then put it into the ultrasonic field at a frequency of 35kHz and clean it again.

[0065] (2) Thermal spraying on the surface of the workpiece

[0066] Preheat the pretreated workpiece to 200°C, and use atmospheric plasma spraying equipment to spray the inner layer of gadolinium zirconate ceramics on the surface of the workpiece. The parameters for sp...

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Abstract

The invention discloses a metal workpiece double layer coating suitable for high temperature environment and a manufacturing method thereof. The manufacturing method of the metal workpiece double layer coating suitable for the high temperature environment includes the following steps of 1) pretreatment: degreasing the surface of a metal workpiece, sandblasting roughening and cleaning; 2) spraying:preheating the pretreated metal workpiece, adopting an atmospheric plasma spraying device for spraying, first spraying a ceramic inner layer on the surface of the metal workpiece, then heating and spraying a metal outer layer and then spraying a metal layer on the side of an obtained coating; 3) heat treatment: conducting vacuum heat treatment on the sprayed metal workpiece and conducting gas quenching. According to the manufacturing method, the metal layer is sprayed on the ceramic layer. On one hand, the high cost of ceramic precision machining is reduced; on the other hand, various corrosion-resistant or wear-resistant alloy materials can be applied. In addition, the melting point of metal is lower than that of the ceramic, and the mechanical properties of the coating can be changed bythe heat treatment process.

Description

technical field [0001] The invention relates to a double-layer coating for metal workpieces suitable for high-temperature environments and a manufacturing method thereof. Background technique [0002] The thermal efficiency value of a modern heavy-duty diesel engine is about 45%, about 30% of the energy is lost through the exhaust port, and about 20% of the energy is taken away by the cooling water. Coating the thermal barrier coating on the inner wall of the engine cylinder can reduce heat loss and improve thermal efficiency, but the high processing cost of ceramics is not conducive to the fine grinding of the inner wall of the cylinder liner. The high melting point of ceramics also makes the porosity of the coating higher than that of metal coating The porosity of the layer is high, and wear debris and carbon black are easily embedded in the pores of the coating; in addition, the ceramic abrasive grains have high hardness, which is easy to aggravate the wear of the cylinde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/11C23C4/08C23C4/073C23C4/18
CPCC23C4/073C23C4/08C23C4/11C23C4/134C23C4/18
Inventor 叶子波林乐书徐伟
Owner GUANGDONG POLYTECHNIC NORMAL UNIV
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