Non-destructive testing method for characterizing self-repairing effect in self-repairing thermal barrier coating high-temperature service process
A technology of thermal barrier coating and high temperature service, applied in the direction of material analysis using acoustic wave emission technology
Inactive Publication Date: 2019-05-31
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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The use of in-situ acoustic emission technology is a kind of online real-time dynamic non-destructive testing, and there is no report or technology disclosure in this area.
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[0021] figure 1 A self-healing modal flowchart representing acoustic emission signal processing for a self-healing coating. figure 2 Schematic diagram showing the acoustic emission signal detection of the self-healing coating under high temperature and strong heat flux test (BRT) conditions.
[0022] In one embodiment of the present invention, the non-destructive testing method for characterizing the self-healing effect of the self-healing thermal barrier coating under high-temperature service conditions includes the following steps:
[0023] The assessment conditions of thermal barrier coatings under actual service conditions were simulated, and the dynamic cyclic thermal assessment of self-healing thermal barrier coatings under actual high-temperature service conditions was carried out by using the high heat flux cyclic thermal assessment test (Burner Rig Test, BRT).
[0024] First, the self-healing effect of coating 1 should occur. The self-healing effect of the coating ...
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The present invention provides a non-destructive testing method for characterizing self-repairing effect in a self-repairing thermal barrier coating high-temperature service process. The method comprises the steps of: by means of an in-situ acoustic emission signal test, reflecting a self-repairing effect of a coating according to the change of feature parameters of the in-situ acoustic emission signal; and employing a following real-time dynamic online detection method: in the coating high-temperature service process, generating crack initiation and expansion in the coating to obtain true signals of the crack expansion; when the internal portion of the coating is self-repaired, allowing the feature parameters of the in-situ acoustic emission signal to be obviously changed, dynamically reflecting the self-repairing effect of the coating in real time, and further utilizing a series of mathematical processing methods of the acoustic emission signal to perform shape discrimination and pattern recognition of the self-repairing effect of the coating. The method provided by the invention can qualitatively and truly give self-repairing information of the self-healing thermal barrier coatings under high temperature service conditions.
Description
technical field [0001] The invention relates to a non-destructive characterization method for the fracture mechanical properties of an inorganic coating, an in-situ non-destructive real-time dynamic on-line testing technology, and in particular to a non-destructive test for characterizing the self-repair effect of a self-repair thermal barrier coating during high-temperature service method. Background technique [0002] Thermal barrier coating is an important metal-inorganic composite multilayer structure material, which is widely used in aero-engines, ground heavy-duty gas turbines (referred to as "two machines") high-temperature alloy blades or other high-temperature hot-end components, for blades or other The high-temperature hot-end parts have the functions of high-temperature heat insulation, anti-oxidation, anti-wear or corrosion. As the performance requirements for the "two machines" continue to rise, higher and higher requirements are also put forward for thermal ba...
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IPC IPC(8): G01N29/14
Inventor 王亮明辰王有伟宋二红邱吴劼黄健
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI