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A method for preparing multi-layer coatings by thermal spraying

A multi-layer coating and thermal spraying technology, which is applied in the coating, metal material coating process, fusion spraying, etc., to achieve the effects of fewer multi-layer coating defects, high deposition efficiency, and high coating preparation efficiency

Active Publication Date: 2018-10-02
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved in the present invention is: to overcome the problem that multiple spraying is required when the existing thermal spraying technology prepares multi-layer coatings of different materials and the layers are mechanically combined with obvious interfaces, and improve the spraying efficiency of thermal spraying, Obtain higher bonding strength, and the prepared coating can meet the expected life requirements under various impact load conditions

Method used

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  • A method for preparing multi-layer coatings by thermal spraying
  • A method for preparing multi-layer coatings by thermal spraying

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Al prepared by different path powder feeding spraying 2 o 3 +TiO 2 / High chromium iron multilayer coating, Al 2 o 3 +TiO 2 (melting point is 1894°C) particle size is 300 mesh, high chromium iron powder (melting point is 1857°C) is 300 mesh. Spray distance 200mm; current 410A; voltage 320V; N 2 Flow 230L / min; Ar flow 100L / min; H 2 Flow rate 15L / min; High chromium ferro powder feeding voltage 18V; Al 2 o 3 +TiO 2 The powder feeding voltage is 8V. The moving speed of the spray gun is 6mm / s, and the thickness of the prepared coating is about 500μm; the hardness of the coating is about 950 HV, and the bonding strength reaches 95Mpa.

[0029] The Al prepared in this example 2 o 3 +TiO 2 Multi-layer coatings alternately distributed with high chromium iron, the SEM image is as follows figure 1 As shown, the high chromium iron layer and Al can be seen from the figure 2 o 3 +TiO 2 The layers are distributed alternately, there is no obvious interface between the...

Embodiment 2

[0031] Al prepared by different path powder feeding spraying 2 o 3 +TiO 2 / MgO multilayer coating, Al 2 o 3 +TiO 2 (melting point is 1894°C) particle size is 300 mesh, MgO (melting point is 2800°C) powder is 200 mesh. Spray distance 200mm; current 430A; voltage 320V; N 2Flow 230L / min; Ar flow 100L / min; H 2 Flow rate 15L / min; MgO powder feeding voltage 6V; Al 2 o 3 +TiO 2 Powder feeding voltage 15-20V. The moving speed of the spray gun is 6 mm / s, and the thickness of the prepared coating is about 500 μm. The hardness of the coating is about 950HV, and the bonding strength reaches 95Mpa.

Embodiment 3

[0033] Al prepared by different path powder feeding spraying 2 o 3 +TiO 2 / YSZ multilayer coating, Al 2 o 3 +TiO 2 (melting point is 1894°C) particle size is 300 mesh, YSZ (melting point is 2480°C) powder is 200 mesh. Spray distance 200mm; current 410A; voltage 320V; N 2 Flow 230L / min; Ar flow 100L / min; H 2 Flow rate 15L / min; YSZ powder feeding voltage 8V; Al 2 o 3 +TiO 2 The powder feeding voltage is 18V. The moving speed of the spray gun is 6 mm / s, and the thickness of the prepared coating is about 900 μm. The hardness of the coating is about 950 HV, and the bonding strength reaches 95Mpa.

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Abstract

The invention discloses a method for preparing multiple coating layers by a thermal spraying method, and belongs to the field of preparation of multiple composite coating layers. The method pretreats a basal body, and then performs thermal spraying; single spraying is performed in the thermal spraying process; multiple powder feeding pipelines synchronously feed powder; and one kind of powder is conveyed in one powder feeding pipeline. Different types of thermal spraying powder is fed into thermal spraying flame current through different powder feeding pipelines and are mainly concentrated in different areas of the flame current; and when the thermal spraying flame current carrying with molten drops deposit the coating layers on the basal body with a certain speed and direction, the time of the flame current in different areas passing through the same one part of the basal body is different, so that the different types of coating layers are respectively deposited on the basal body in sequence. The coating layers prepared by the method have no obvious intersection, so that the bonding is better, and the defects among the coating layers are fewer. The resistance for various load impacts of the coating layers is higher, so that the preparation of thicker coating layers is possible.

Description

technical field [0001] The invention relates to a method for preparing a multilayer coating by a thermal spraying method, which belongs to the field of preparation of a multilayer composite coating. Background technique [0002] With the development of surface modification technology, and the application environment of surface sprayed functional coatings such as thermal barrier coatings, wear-resistant coatings, corrosion-resistant coatings, and insulating coatings is becoming more and more harsh. Among them, the impact load, high temperature load, and complex condition load that the coating bears during its service make the structural design and performance of the coating more demanding. Therefore, multilayer coatings have gradually become the research focus of the thermal spraying industry. The performance of traditional single-layer coatings in all aspects cannot meet the requirements of harsh environments. Therefore, spraying multi-layer coatings with different compone...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/131C23C4/11C23C4/06C23C4/10C23C4/02
CPCC23C4/02C23C4/06C23C4/10
Inventor 宋鹏罗恒陆建生刘光亮
Owner KUNMING UNIV OF SCI & TECH
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