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Experiment control method for researching flexion damage of thermal curtain coating interface containing inner embedded interface defect under high temperature environment

A technology of interface defects and thermal barrier coatings, applied in the direction of applying stable tension/pressure to test the strength of materials, measuring devices, instruments, etc., can solve the problem of inability to determine the specific location and time of buckling failure, and the inability to accurately record experimental failure conditions , Difficult to observe in real time and other problems, to save manpower, shorten experiment time and improve experiment efficiency

Inactive Publication Date: 2009-05-20
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that it is difficult to observe the buckling failure phenomenon in real time, and the specific location and time of the buckling failure cannot be determined, and the experimental failure conditions cannot be accurately recorded, and only a qualitative analysis of the buckling failure at the thermal barrier coating interface can be done.

Method used

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  • Experiment control method for researching flexion damage of thermal curtain coating interface containing inner embedded interface defect under high temperature environment
  • Experiment control method for researching flexion damage of thermal curtain coating interface containing inner embedded interface defect under high temperature environment
  • Experiment control method for researching flexion damage of thermal curtain coating interface containing inner embedded interface defect under high temperature environment

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Experimental program
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Embodiment 1

[0020] Since the thermal barrier coating system takes a long time to form interface defects and microscopic cracks in the actual application process, and the microscopic cracks continue to expand, and finally connect to macroscopic cracks, it also takes a long time. The ceramic layer The residual compressive stress can accumulate to the critical stress of ceramic layer buckling failure. In order to shorten the experimental time and improve the experimental efficiency, this embodiment adopts the plasma spraying process to artificially and reasonably prepare the experimental sample of the thermal barrier coating containing an interface defect, and adopts the experimental method proposed by the present invention to test the sample containing the interface defect in a high temperature environment. Experimental research was carried out on the thermal barrier coating samples, and the experimental phenomena of interface buckling failure were obtained, and then the experimental contr...

Embodiment 2

[0047] Using the same preparation process to prepare thermal barrier coating samples containing interface defects, only the prefabricated original length of the interface defects is changed, that is, in this specific embodiment, a is set to 4mm, 5mm, 6mm, 8mm and 10mm respectively, The number of samples of each type is 5. Using the same experimental method and experimental procedure, the thermal barrier coating sample containing interface defects was subjected to high-temperature compression experiments to obtain the experimental conditions and control methods for the interface buckling failure of the ceramic layer, and the processing method for the results was the same as in Example 1.

[0048] In the experiment, it was found that the larger the pre-designed original defect length a, the easier the interface buckling failure of the sample at high temperature; and the smaller the pre-designed original defect length a, the harder the sample is to undergo interfacial buckling...

Embodiment 3

[0050] In this embodiment, the normal plasma spraying preparation process and preparation procedures are used to prepare the thermal barrier coating sample. The materials of the thermal barrier coating sample are respectively: the substrate (1) is a nickel-based superalloy material, and the bonding layer (2) It is a NiCrAlY alloy; the material of the ceramic layer (5) contains 6-8wt% Y 2 o 3 ZrO 2 .

[0051] Its concrete preparation steps are as follows:

[0052] The first step substrate (1) pretreatment

[0053] Sand blast the selected substrate (1) to make the surface roughness of the substrate (1) Ra<0.7, and the geometric dimensions of the substrate (1) are 40×5×5mm.

[0054] The second step is to prepare the bonding layer by plasma spraying process (2)

[0055] The substrate (1) treated in the first step is installed on the workbench of the spraying equipment, and the first substrate with an adhesive layer is prepared under the first group of plasma sp...

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Abstract

The invention discloses an experimental control method for experiments studying the interface buckling failure of thermal barrier coatings containing buried interface defects in high-temperature environment. Experimental equipment needed by the experimental method is as follows: a universal testing machine, an oxyacetylene high-temperature heating device, a thermocouple temperature measurement device, a CCD observation device for coating failure process and a computer. The method mainly comprises the following steps: a certain compressive load is applied in advance to a thermal barrier coating specimen containing interface defects; the method has corresponding requirements on the magnitude and application modes of the load; and residual compressive stress in a thermal barrier ceramic coating is approximately replaced with the compressive load. Therefore, the method is simple to operate and capable of shortening experimental time, thereby providing an important experimental method for analyzing the interface bonding performance of a ceramic layer and a bonding layer and providing a good basis and reference experience for studying the interface buckling problems of film / coating systems in future. The interface-crack critical length a[cr] of the thermal barrier ceramic coating with interface buckling failure is experimentally found to be 3 to 4 millimeters in general.

Description

technical field [0001] The invention relates to an experimental control method for buckling failure of a thermal barrier coating experimental sample with embedded interface defects in a high temperature environment. Background technique [0002] In the field of new material technology, coating / film materials have force, heat, light, electricity, magnetism, chemical and transport properties that many matrix materials do not have. It is these unique physical properties that make coating / film materials It has played an extremely important role in the fields of microelectronic devices, magnetic memory, surface coating and composite materials. However, due to the mismatch of material parameters and the influence of interface defects, operating temperature, residual stress and applied load, the coating / film material usually undergoes interface delamination, buckling and peeling failure with the base material in practical applications. Hundreds of different types of coating / film m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01N3/60G01N19/08
Inventor 毛卫国戴翠英周益春
Owner XIANGTAN UNIV
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