Method for measuring interface fracture toughness of APS thermal barrier coating based on double-layer material model

A technology of thermal barrier coating and fracture toughness, which is applied in the field of measurement to achieve the effect of accurate measurement

Active Publication Date: 2021-12-03
CIVIL AVIATION UNIV OF CHINA
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Problems solved by technology

[0007] However, the use of this formula does not consider the influence of porosity. If this formula is used in a double-layer thermal barrier coating system with a metal bonding layer as the bottom layer and a ceramic layer as the surface layer, the hardness and elastic modulus of the ceramic layer need to be Use a correction value that takes into account the effect of porosity

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  • Method for measuring interface fracture toughness of APS thermal barrier coating based on double-layer material model
  • Method for measuring interface fracture toughness of APS thermal barrier coating based on double-layer material model
  • Method for measuring interface fracture toughness of APS thermal barrier coating based on double-layer material model

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[0033] The present invention will be described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific embodiments are only used for further description of the present invention, and cannot be interpreted as limiting the protection scope of the present invention. Those skilled in the art can Further non-essential improvements and adjustments are made according to the above content of the invention.

[0034] The method for measuring the radius of curvature of the APS coating residual stress test piece based on the parabolic model provided by the present embodiment includes the following steps carried out in order:

[0035] 1) Preparation of APS thermal barrier coating samples: Select Hastelloy X with a flat and smooth surface as the substrate, with a size of 25mm×6mm, perform sandblasting and roughening treatment, and then perform atmospheric plasma spraying on the sandblasted side of the substrate in turn ...

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Abstract

The invention discloses a method for measuring interface fracture toughness of an APS thermal barrier coating based on a double-layer material model. The method comprises the following steps: preparing a thermal barrier coating sample by adopting APS, and measuring the hardness and Young modulus values of different layers and different points of the sample; for the ceramic surface layer, considering the influence of porosity, and correcting the hardness and Young modulus of the ceramic surface layer by adopting a correction formula; substituting the obtained data into a double-layer model calculation formula to obtain the ratio of the overall Young modulus to the hardness; performing linear fitting on indentation data at the interface in Origin or Excel to calculate coordinates of an intersection point to obtain a critical load and a critical crack length at the interface; and substituting the data into a classical formula to obtain the interface fracture toughness. According to the method, the characteristic that the thermal barrier coating sprayed by the APS has certain porosity is considered, the hardness and the Young modulus of the ceramic surface layer are corrected, a quite accurate interface fracture toughness value is obtained, errors caused by pores are reduced, and the interface fracture toughness is closer to a true value.

Description

technical field [0001] The invention belongs to the field of measurement technology, in particular to a method for measuring the interface fracture toughness of an APS thermal barrier coating based on a double-layer material model. Background technique [0002] Thermal barrier coating is a high-temperature / ultra-high-temperature protective coating widely used on the surface of hot-end components of gas turbines and aero-turbine engines. Atmospheric plasma spraying (APS) is one of the most commonly used surface processing techniques for thermal barrier coatings on the surface of hot end components. This method has the advantages of simple equipment, easy adjustment of process parameters, and high production efficiency. High density and bonding strength. At present, the thermal barrier coatings used for the hot end parts of aero-engines are mainly double-layer coating structures, that is, the metal bonded bottom layer and the ceramic surface layer. For thermal barrier coatin...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08G01N3/42
CPCG01N15/088G01N3/42G01N2203/0076
Inventor 刘延宽费宇杰王志平战金滢王源生邹慧
Owner CIVIL AVIATION UNIV OF CHINA
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