Device for detecting creep/thermal deformation and internal crack of high-temperature coating

Abstract

The invention provides a device for detecting creep / thermal deformation and internal crack of a high-temperature coating. The device is characterized by comprising a light source (1), an optical fiber spectroscope (2), lenses (3, 6 and 8), a reference mirror (4), a PZT motor and a control system (5) thereof, a scanning mirror and a control system (7) thereof, a coating structure sample (9), a high-temperature furnace (10), a thermal baffle (11), a spectrograph (12), an optical fiber (13) and a computer (14). The optical fiber spectroscope (2) is divided into four paths which are respectively connected to the light source (1), the spectrograph (12), the PZT motor and the control system (5) thereof through the lens (3) and the reference mirror (4), and the scanning mirror and the control system (7) thereof through the lens (6). Light emitted by the coating structure sample (9) in the high-temperature furnace (10) passes through the small hole of the thermal baffle (11) and is irradiated by the lens (8) to the scanning mirror and the control system (7) thereof. The output of the spectrograph (12) is connected to the computer (14) through the optical fiber (13). A control signal output by the computer (14) is respectively connected to the PZT motor and the control system (5) thereof and the scanning mirror and the control system (7) thereof. The device can be used for detecting both creep / thermal deformation of a high-temperature coating structure, the internal cracks of the coating and the surface cracks of a substrate. With high detection precision, the device can be used for real-time online detection / monitoring.

Description

technical field [0001] The invention belongs to the technical fields of photomechanics, material performance testing and structural damage detection, and particularly relates to a high-temperature coating structure creep / thermal deformation and internal crack detection device. . Background technique [0002] Nuclear power pressure vessels, aero engines and other structures need to withstand high temperature, high pressure, thermal shock and other factors. Usually, it is necessary to coat / plating thermal insulation coating on the surface of these parts to play the role of heat insulation, anti-oxidation and anti-corrosion. Under the action of high temperature, even if the stress on the coating structure is lower than the yield point at this temperature, slow and continuous high-temperature deformation-creep will inevitably occur for a long time. Once the creep deformation increases to a certain extent, it will A malfunction occurs, resulting in an accident. Therefore, it is...

AI Technical Summary

Problems solved by technology

However, the above five commonly used methods can only detect structural crack information, and cannot measure the thermal deformation of the structure.

[0004] In summary, there is still no detection method that can detect the thermal deformation / creep of high-temperature coating structures, and can simultaneously detect the characteristics of internal cracks in the coating and cracks on the surface of the substrate.

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