Method for measuring interface bonding strength of thermal barrier coating layer

A technology of interfacial bonding strength and thermal barrier coating, which is applied in the direction of measuring devices, using stable tension/pressure testing material strength, instruments, etc., to achieve the effect of simple preparation
CN107345898AActive Publication Date: 2017-11-14JIANGSU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
JIANGSU UNIV
Publication Date
2017-11-14

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Abstract

The invention relates to the measurement field of mechanical properties of materials and particularly relates to a method for measuring the interface bonding strength of a thermal barrier coating layer. The method comprises the following steps: (1) acquisition of stress-strain data: firstly preparing a measuring test piece, and acquiring and recording a load-displacement curve by virtue of a three-point bending method so as to acquire the stress-strain data; (2) calculation of crack length: representing the deformation of the measuring test piece by virtue of a digital image relevant method, and combining with the displacement of an open angle to determine a crack tip position, so as to calculate the crack length; and (3) calculation of energy release rate: after the stress-strain data and the crack length are acquired, calculating the energy release rate by virtue of a flexibility method. According to the method provided by the invention, by utilizing the characteristic that the breakable thermal barrier coating layer and a hard alloy matrix are different when being deformed by virtue of an external force, the external force is applied to an alloy basement by virtue of an improved three-point bending method, and the interface bonding strength of the thermal barrier coating layer with a deformed interface is represented by virtue of the digital image relevant method.
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Description

technical field

[0001] The invention relates to the technical field of measuring mechanical properties of materials, in particular to a method for measuring the interface bonding strength of a thermal barrier coating. Background technique

[0002] Thermal barrier coating refers to a "laminated" system in which a metal buffer layer or a metal bonding layer and a ceramic layer with good heat resistance and heat insulation are combined with the metal surface to function as heat insulation protection. That is, metal-ceramic composite coating system. Thermal barrier coatings mainly use the characteristics of low thermal conductivity, high melting point, corrosion resistance and wear resistance of ceramic materials to reduce the surface temperature of blades and protect blades, thereby improving the efficiency of gas turbines. The current study shows that the ceramic layer can produce a temperature drop of up to 300°C. The classic thermal barrier coating structure includes an ul...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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