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Method for improving thermal barrier coating bonding strength

A technology of bonding strength and thermal barrier coating, which is applied in coating, metal material coating process, fusion spraying, etc., can solve the problems of reduced bonding strength of coating and easy oxidation of thermal barrier coating, etc., to achieve bonding strength Improved effect

Active Publication Date: 2018-10-30
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing thermal barrier coating is prone to oxidation when heated in an aerobic environment, which reduces the bonding strength of the coating, and provides a method for improving the bonding strength of the thermal barrier coating

Method used

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  • Method for improving thermal barrier coating bonding strength
  • Method for improving thermal barrier coating bonding strength
  • Method for improving thermal barrier coating bonding strength

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specific Embodiment approach 1

[0017] Specific implementation mode 1: This implementation mode is a method for improving the bonding strength of thermal barrier coatings, which is specifically completed according to the following steps:

[0018] 1. Nano-CeO 2 Modified NiCrAlY: Prepare nano-CeO by vacuum melting first 2 NiCrAlY alloy, the containing nano-CeO 2 The mass fraction of Cr in the NiCrAlY alloy is 25-26%, the mass fraction of Al is 10-11%, the mass fraction of Y is 1-1.5%, and the nano-CeO 2 The mass fraction of CeO is 0.1-1.2%, and the balance is Ni; Ultrasonic gas atomization powder making equipment will contain nano-CeO 2 NiCrAlY alloy made of sprayable feedstock to obtain n-CeO 2 / NiCrAlY can be sprayed and fed;

[0019] 2. Spraying and heat treatment: first spray n-CeO on the surface of the metal substrate by plasma spraying or supersonic flame spraying 2 / NiCrAlY can be sprayed and fed to obtain n-CeO on the surface of the metal substrate 2 / NiCrAlY bonding layer, then plasma sprayed on...

specific Embodiment approach 2

[0024] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the mass fraction of Cr in the NiCrAlY alloy described in step 1 is 25.3%, the mass fraction of Al is 10.3%, and the mass fraction of Y is 1.1%, nano-CeO 2 The mass fraction of Ni is 0.2%, and the balance is Ni. Others are the same as the first embodiment.

specific Embodiment approach 3

[0025] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: n-CeO described in step one 2 / NiCrAlY can be sprayed with a particle size of 10μm to 45μm. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention relates to a method for improving a thermal barrier coating bonding strength. The method aims at solving the problem that an existing thermal barrier coating is likely to be oxidized when heated in the oxygen environment, and the coating bonding strength is reduced. The method comprises the steps that 1, NiCrAlY alloy containing nanoCeO2 is prepared into n-CeO2 / NiCrAlY spraying feedthrough ultrasonic gas atomization powdering equipment; 2, the surface of a metal matrix is sprayed with the n-CeO2 / NiCrAlY spraying feed to form a bonding layer, a ceramic layer is sprayed, finally,heat treatment is carried out, and therefore a thermal barrier coating is obtained on the surface of the metal matrix. The method has the advantages that nanoCeO2 modification and heat treatment act jointly, the thermal barrier coating bonding strength is remarkably improved, and the stretching bonding strength reaches up to 48.9MPa. The method is mainly used for a ground bonding layer between themetal matrix and the ceramic layer.

Description

technical field [0001] The invention relates to a method for improving the bonding strength of a thermal barrier coating. Background technique [0002] MCrAlY (M=Ni / Co / Ni+Co) coating has the advantages of good resistance to high-temperature oxidation and hot corrosion, good plasticity, and adjustable composition. It is widely used for high-temperature protection of hot-end parts such as engines and turbine blades. MCrAlY coating can be used not only as a single protective coating, but also as the primer bonding layer of thermal barrier coatings, which has very important practical application value. Since the failure of the thermal barrier coating is closely related to the bonding strength of the thermal barrier coating, during the service period of the thermal barrier coating, there is a coupling field of temperature and stress in the coating. If the bonding strength of the coating is not enough, the thermal barrier coating The layer is easy to fail, so how to improve the b...

Claims

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Application Information

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IPC IPC(8): C23C4/073C23C4/10C23C4/134C23C4/129C23C4/18
CPCC23C4/073C23C4/10C23C4/129C23C4/134C23C4/18
Inventor 贾近张振国刘赛月王铀张东兴
Owner HARBIN INST OF TECH