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A kind of composite thermal spraying method

A technology of thermal spraying and powder spraying, applied in the direction of coating, molten spraying, metal material coating process, etc., can solve the problems of difficult to spray and easily oxidized materials, difficult to spray and easy to oxidize, fiber or whisker addition, etc. Achieve the effects of shortening the time of heating or oxidation, low heating temperature, and preventing melting

Active Publication Date: 2019-12-10
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For powder spraying materials, since thermal spraying technology needs to be heated to a molten or semi-molten state by a heat source, this kind of melting of powder by high temperature brings two defects to this technology: one is difficult to spray easily oxidized materials , such as diamond; the second is that the original powder shape cannot be preserved, for example, it is difficult to add fibers or whiskers to the coating by thermal spraying
This patent application is difficult to spray easily oxidized materials such as diamond
Although by adjusting the spraying temperature, it is possible to melt the metal powder with a low melting point and keep the ceramic powder with a high melting point from melting, thereby retaining the original structure of the ceramic powder in the coating, but this method can only retain the structure of the powder with a high melting point. Does not retain the structure of powders with low melting points

Method used

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  • A kind of composite thermal spraying method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The wear-resistant coating was prepared by spraying diamond powder with composite thermal spraying technology based on atmospheric plasma spraying.

[0028] First, add a powder feeding tube to the spray gun, such as figure 1 As shown, the powder feeding pipe adopts an alumina ceramic tube with an inner diameter of 2.5 mm, and the length is about 15 cm. The powder feeding port is about 2 cm above the flame, and the included angle with the flame is about 70°. The powder feed port is connected to the top of the diamond powder feeder.

[0029] Next, the stainless steel substrate is cleaned and sandblasted. Atmospheric plasma spraying is then performed. The spraying current is 380A, the voltage is 150V, the flow rate of the main gas argon is 90L / min, the flow rate of hydrogen is 15L / min, and the distance between the spray gun and the substrate is 100mm. Metal powder is fed into the original powder feeding port; diamond powder is fed into the newly added powder feeding por...

Embodiment 2

[0031] The composite thermal spraying technology based on atmospheric plasma spraying was used to spray the zirconia whisker toughened thermal barrier coating.

[0032] First, add a powder feeding tube to the spray gun, such as figure 1 As shown, the powder feeding pipe adopts an alumina ceramic tube with an inner diameter of 2.5 mm, and the length is about 15 cm. The powder feeding port is about 2 cm above the flame, and the included angle with the flame is about 70°. The powder feed port is connected to the zirconia whisker powder feeder.

[0033] Secondly, the superalloy substrate is cleaned and sandblasted. The metal bond coat was then prepared using atmospheric plasma spraying. The spraying current is 380A, the voltage is 150V, the flow rate of the main gas argon is 90L / min, the flow rate of hydrogen is 15L / min, and the distance between the spray gun and the substrate is 100mm. The powder feeding amount of the metal powder NiCoCrAlY is 20g / min, and the flow rate of the...

Embodiment 3

[0036] The composite thermal spraying technology based on atmospheric plasma spraying is used to spray graphite powder to adjust the porosity of thermal barrier coating.

[0037] First, add a powder feeding tube to the spray gun, such as figure 1 As shown, the powder feeding pipe adopts an alumina ceramic tube with an inner diameter of 2.5 mm, and the length is about 15 cm. The powder feeding port is about 2 cm above the flame, and the included angle with the flame is about 70°. The powder feeding port is connected to the graphite powder feeder.

[0038] Secondly, the superalloy substrate is cleaned and sandblasted. The metal bond coat was then prepared using atmospheric plasma spraying. The spraying current is 380A, the voltage is 150V, the flow rate of the main gas argon is 90L / min, the flow rate of hydrogen is 15L / min, and the distance between the spray gun and the substrate is 100mm. The powder feeding amount of the metal powder NiCoCrAlY is 20g / min, and the flow rate o...

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Abstract

The invention relates to a composite thermal spraying method. The composite thermal spraying method comprises the following steps of cleaning and sandblasting a substrate to be subjected to the thermal spraying process, and then carrying out thermal spraying treatment on the substrate through a raw powder feeding port of a spraying gun. A powder feeding port is newly added to the spraying gun and used for spraying of the powder from the vicinity of the substrate to the substrate surface. Compared with the prior art, the composite thermal spraying method can be used for spraying oxidizable materials, and also can retain the original powder morphology.

Description

technical field [0001] The invention relates to the field of thermal spraying coatings, in particular to a composite thermal spraying method. Background technique [0002] Thermal spraying technology is a technology that heats a powdery or linear material to a molten state through a heat source such as a flame, electric arc or plasma, and accelerates the formation of high-speed molten droplets, which are sprayed onto the substrate to form a coating. This technology can not only be used to enhance the performance of materials (such as wear resistance, corrosion resistance, heat resistance, etc.), to protect the matrix, but also to reduce the size of parts caused by wear, corrosion or machining errors. repair. At the same time, special properties (such as optical and electrical properties) can also be given to the surface of the material. [0003] Thermal spraying technology has a history of more than eighty years. At present, it is widely used in almost all industries and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/12C23C4/134
CPCC23C4/12C23C4/134
Inventor 单萧赵晓峰郭芳威王欣肖平
Owner SHANGHAI JIAO TONG UNIV
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