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Method for preparing multi-layer coating by adopting thermal spraying method

A multi-layer coating and thermal spraying technology, which is applied in the coating, metal material coating process, fusion spraying, etc., can solve the problems of multiple spraying, achieve good coating performance and improve the production efficiency

Active Publication Date: 2016-10-12
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: to overcome the problem of multiple spraying when preparing multi-layer coatings of different materials by the existing thermal spraying technology, improve the spraying efficiency of thermal spraying, obtain higher bonding strength, and coat under the same thickness. Layers can withstand more shock loads

Method used

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  • Method for preparing multi-layer coating by adopting thermal spraying method
  • Method for preparing multi-layer coating by adopting thermal spraying method
  • Method for preparing multi-layer coating by adopting thermal spraying method

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The spray material used in this embodiment is Al 2 o 3 +40wt%TiO 2 , NiAl mixed powder, wherein, the particle size, fusing point, density of each powder are as shown in table 1:

[0030] Table 1

[0031]

[0032] Preparation of Al by powder feeding in the same way 2 o 3 +40wt%TiO 2 / NiAl multilayer coating, the prepared multilayer coating is as figure 1 As shown, the spraying distance is 110mm; the current is 550A, the voltage is 70V; N 2 Flow rate 2400L / h; Ar flow rate 2000L / h; powder feeding voltage 10V; Al 2 o 3 +40wt%TiO 2 It is mechanically mixed with NiAl at a ratio of 5:1; the moving speed of the spray gun is 6mm / s; the thickness of the prepared coating is about 500μm; the hardness is about 800HV; the bonding strength reaches 90Mpa.

Embodiment 2

[0034] The spray material used in this embodiment is Al 2 o 3 +40wt%TiO 2 , the mixed powder of MgO, wherein, the granularity of each powder, fusing point, density are as shown in table 2:

[0035] Table 2

[0036]

[0037] Preparation of Al by powder feeding in the same way 2 o3 +40wt%TiO 2 / MgO, spray distance 100mm; current 580A, voltage 70V; N 2 Flow rate 2400L / h; Ar flow rate 2000L / h; powder feeding voltage 10V; Al 2 o 3 +40wt%TiO 2 It is mechanically mixed with MgO at a ratio of 4:1; the moving speed of the spray gun is 6mm / s; the thickness of the prepared coating is about 500μm; the hardness is about 900HV; the bonding strength reaches 80Mpa.

Embodiment 3

[0039] The spray material used in this embodiment is Al 2 o 3 +40wt%TiO 2 , YSZ (ZrO 2 +8wt%Y 2 o 3 ) mixed powder, wherein the particle size, melting point, and density of each powder are as shown in Table 3:

[0040] table 3

[0041]

[0042] Preparation of Al by powder feeding in the same way 2 o 3 +40wt%TiO 2 / YSZ multi-layer coating, spraying distance 100mm; current 600A, voltage 70V; N 2 Flow rate 2400L / h; Ar flow rate 2000L / h; powder feeding voltage 10V; Al 2 o 3 +40wt%TiO 2 Mechanically mix with YSZ according to the ratio of 4:1; the moving speed of the spray gun is 6mm / s; the thickness of the prepared coating is about 400μm; the thickness of each layer is controlled by controlling the ratio of the two powders; the hardness is about 900HV; the bonding strength Reach 90Mpa.

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Abstract

The invention discloses a method for preparing a multi-layer coating by adopting a thermal spraying method, and belongs to the technical field of composite coatings. The method comprises the following steps: adopting a single spraying mode in a thermal spraying process, and feeding mixed powder of two or more different spraying materials on the same path; accelerating different powder in plume flow to obtain different speeds; and enabling different powder to have different difference while being sprayed to a basal body, thereby obtaining powder of different densities or grain sizes of the multi-layer coating. Compared with the prior art, the method enables coatings to be combined with each other better, so that the coatings have stronger plasticity; the method has the advantages of making preparation of a thicker coating possible, reducing defects on an interface and the like. The method further has the characteristics of being simple in process and equipment, saving time and energy, being high in efficiency and the like.

Description

technical field [0001] The invention belongs to the field of multilayer composite coating preparation, and relates to the application of thermal spraying to prepare high-performance multilayer coatings with different components and microstructures in each layer. 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. The research on the performance of composite coatings in harsh environments has gradually become the focus of research. The performance of traditional single-layer coatings in all aspects cannot meet the requirements of harsh environments. Therefore, spraying multi-layer coatings with different components on the surface of the substrate can improve the reliability of working under high-speed, high-temperature, high-pr...

Claims

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Application Information

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IPC IPC(8): C23C4/12
CPCC23C4/12
Inventor 宋鹏罗恒陆建生刘光亮
Owner KUNMING UNIV OF SCI & TECH
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