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Method for preparing columnar ceramic coating layer by low-pressure plasma spraying based on liquid phase filtration

A low-pressure plasma and ceramic coating technology, which is applied in coating, metal material coating process, fusion spraying, etc., can solve the problem that it is difficult to realize PS-PVD to prepare columnar structure ceramic coating, and achieve the requirements of materials with less restrictions Effect

Active Publication Date: 2015-03-11
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing columnar ceramic coatings by low-pressure plasma spraying based on liquid phase filtration, so as to solve the problem that conventional plasma spraying systems are difficult to realize PS-PVD preparation of columnar ceramic coatings

Method used

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  • Method for preparing columnar ceramic coating layer by low-pressure plasma spraying based on liquid phase filtration
  • Method for preparing columnar ceramic coating layer by low-pressure plasma spraying based on liquid phase filtration
  • Method for preparing columnar ceramic coating layer by low-pressure plasma spraying based on liquid phase filtration

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Effect test

Embodiment 1

[0034] With zirconia as the matrix, it is processed into a disc sample of Φ18×2mm. Use acetone and alcohol to ultrasonically clean the sample in sequence, use diamond sandpaper to polish the surface of the sample, and finally use alcohol to clean the surface of the sample; use a plasma spray gun with circulating water to cool the buncher cover, and use it under 100Pa ambient pressure , using 7-8wt.% YSZ powder for PS-PVD process to prepare YSZ coating, wherein the spraying parameters are spraying rated power 45kW, Ar 40L / min, H 2 8L / min, spraying distance 260-420mm, powder feeding rate 3g / min, depositing method is to place a columnar blocking device in front of the substrate, and the spray gun does not move during the spraying process. The cross-sectional structure of the coating (such as image 3 (a) to image 3 Shown in (c)) appears as a columnar structure.

Embodiment 2

[0036]With zirconia as the matrix, it is processed into a disc sample of Φ18×2mm. Use acetone and alcohol to ultrasonically clean the sample in sequence, use diamond sandpaper to polish the surface of the sample, and finally use alcohol to clean the surface of the sample; use a plasma spray gun with circulating water to cool the buncher cover, and use it under 100Pa ambient pressure , using 7-8wt.% YSZ powder for PS-PVD process to prepare YSZ coating, wherein the spraying parameters are spraying rated power 60kW, Ar 50L / min, H 2 10L / min, spraying distance 260-420mm, powder feeding rate 3g / min, deposition method is to place a louver-type shielding device in front of the substrate, and the spray gun does not move during the spraying process. The cross-sectional structure of the coating (such as Figure 4 (a) to Figure 4 Shown in (c)) appears as a columnar structure.

Embodiment 3

[0038] With zirconia as the matrix, it is processed into a disc sample of Φ18×2mm. Use acetone and alcohol to ultrasonically clean the sample in sequence, use diamond sandpaper to polish the surface of the sample, and finally use alcohol to clean the surface of the sample; use a plasma spray gun with circulating water to cool the buncher cover, and use it under 100Pa ambient pressure , using 7-8wt.% YSZ powder for PS-PVD process to prepare YSZ coating, wherein the spraying parameters are spraying rated power 78kW, Ar 70L / min, H 2 15L / min, spraying distance 260-420mm, powder feeding volume 3g / min, the deposition method is to place a louver-type shielding device in front of the substrate, and the spray gun does not move during the spraying process. The cross-sectional structure of the coating (such as Figure 5 (a) to Figure 5 Shown in (c)) appears as a columnar structure.

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Abstract

The invention discloses a method for preparing a columnar ceramic coating layer by low-pressure plasma spraying based on liquid phase filtration. During low-pressure plasma spraying, a shading device is arranged between a spraying gun and a base body and is used for preventing liquid phase particles from passing; the shading device allows a vapor phase deposition material or particles with a Brownian movement characteristic to bypass and be deposited on the base body. According to the method disclosed by the invention, under a condition that a low-pressure plasma spraying system condition difficultly obtains all vapor phases, by the adoption of the shading device for the liquid phase particles, the vapor phases or a substance with the Brownian movement characteristic can bypass a shading object and be deposited on the base body, so that the ceramic coating layer with a columnar structure is formed. The feasible and more economic method is provided for application of the plasma spraying system for obtaining all vapor phase deposition coating layers.

Description

【Technical field】 [0001] The invention relates to the technical field of plasma spraying, in particular to a method for preparing a columnar structure ceramic coating by low-pressure plasma spraying. 【Background technique】 [0002] The traditional columnar structure YSZ coating is mainly used on the top layer of thermal barrier coating, which has the advantages of good strain resistance toughness and good heat insulation. In the field of aerospace, the columnar top layer is mainly to prevent the rapid failure of the aeroengine blades under the service conditions of rapid cooling and rapid heating, and to prolong the service life of the engine. In the field of energy, the columnar top layer is mainly used to prevent the failure of land-based gas turbine blades under high temperature service conditions and prolong the service life of the gas turbine. [0003] Due to the high melting point and boiling point of YSZ materials, the traditional method for preparing columnar YSZ la...

Claims

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Application Information

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IPC IPC(8): C23C4/12C23C4/10C23C4/134
CPCC23C4/10
Inventor 李长久李成新杨冠军陈清宇
Owner XI AN JIAOTONG UNIV
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