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Device and method for detecting thickness of thermal barrier coating through employing laser transmission method to excite IR thermal wave

A technology of thermal barrier coating and laser transmission, applied in the direction of measuring devices, optical devices, instruments, etc., can solve the problems of low energy density of flash lamps, unsuitable for non-contact rapid detection, poor thermal conductivity, etc., to improve the quality of laser beams, Effect of reduced thermal lens effect and high conversion efficiency

Active Publication Date: 2017-10-24
HUANENG POWER INTERNATIONAL +1
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  • Abstract
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  • Application Information

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Problems solved by technology

The ultrasonic method is to calculate the coating thickness by analyzing the difference between two adjacent resonant frequencies in the ultrasonic echo frequency domain signal. Due to the many interference factors of the resonant frequency, the detection accuracy is difficult to guarantee, and the steps are complicated. In addition, the above two methods are not Suitable for non-contact rapid detection
[0004] Infrared thermal wave detection of coating thickness generally adopts the thermal excitation of the coating side by the reflection method. However, due to the translucency of the ceramic layer of the thermal barrier coating, the heat absorption effect is poor when excited by visible light or laser, and the coating surface needs to be sprayed with water-soluble black. Paint, the thickness of the paint layer brings detection errors, and there is a risk of paint contamination on the coating of in-service parts
In addition, the excitation of the coating side is difficult to implement due to size limitations for inner cavity coatings such as the transition section of the gas turbine and the flame tube.
The substrate-side flash lamp transmission method can overcome the above shortcomings of the reflection method, but when the coating substrate alloy is a superalloy with poor thermal conductivity and the thickness is large, the energy density of the flash lamp is low and the energy penetration time is long , the flash lamp transmission excitation is difficult to implement

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  • Device and method for detecting thickness of thermal barrier coating through employing laser transmission method to excite IR thermal wave
  • Device and method for detecting thickness of thermal barrier coating through employing laser transmission method to excite IR thermal wave
  • Device and method for detecting thickness of thermal barrier coating through employing laser transmission method to excite IR thermal wave

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Embodiment 1

[0046] Refer to attached figure 1 , the thermal barrier coating thickness laser transmission method excitation infrared thermal wave detection device provided by the present invention includes a signal generator 1, which can output arbitrary waveforms with a frequency of 0.01 μHz to 500 KHz and sine waves with a frequency of 0.01 μHz to 15 MHz, and the number of channels is 2. The waveform vertical resolution is 16 bits; the power amplifier 2, the maximum output voltage is 400Vp-p, the maximum output current is 2Ap-p, the working frequency range is 0-7KHz, and the nonlinear distortion is 2 0 3 Stabilized ZrO 2 , the design thickness is 150μm. The base alloy is K438 nickel-based equiaxed superalloy with a thickness of 15 mm. In the working state, the pulsed laser 3 is placed on the side of the base alloy of the thermal barrier coating component 6 , and the pulsed laser 3 is connected to the output end of the signal generator 1 through the power amplifier 2 . The thermal imag...

Embodiment 2

[0056] Refer to attached figure 1 , the thermal barrier coating thickness laser transmission method excitation infrared thermal wave detection device provided by the present invention includes a signal generator 1, which can output arbitrary waveforms with a frequency of 0.01 μHz to 500 kHz and sine waves with a frequency of 0.01 μHz to 15 MHz, and the number of channels is 2. The vertical resolution of the waveform is 14 bits; power amplifier 2, the maximum output voltage is 400Vp-p, the maximum output current is 2Ap-p, the operating frequency range is 0-7KHz, and the nonlinear distortion is less than 2%; the pulse laser 3 is Semiconductor-pumped solid-state laser, the maximum power is 100W, the spot diameter is 5mm, the pulse width is adjustable from 1ms to 5s, and the wavelength is 1064nm; the infrared thermal imager 4 is an uncooled thermal imager, the image size is 160×120 pixels, and the response The wave band is 8μm-14μm, the acquisition frame frequency is 8.5Hz, and th...

Embodiment 3

[0066] Refer to attached figure 1 , the thermal barrier coating thickness laser transmission method excitation infrared thermal wave detection device provided by the present invention includes a signal generator 1, which can output arbitrary waveforms with a frequency of 0.01 μHz to 500 kHz and sine waves with a frequency of 0.01 μHz to 15 MHz, and the number of channels is 1. The vertical resolution of the waveform is 16 bits; the power amplifier 2, the maximum output voltage is 400Vp-p, the maximum output current is 1.5Ap-p, the working frequency range is 0-7KHz, the nonlinear distortion is less than 2%; the pulse laser 3, It is a semiconductor-pumped solid-state laser with a maximum power of 100W, a spot diameter of 5mm, an adjustable pulse width of 1ms to 5s, and a wavelength of 1064nm; the infrared thermal imager 4 is an uncooled thermal imager, and the image size is 160×120 pixels. The response band is 8 μm to 14 μm, the acquisition frame frequency is 8.5 Hz, and the the...

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Abstract

The invention discloses a device and method for detecting the thickness of a thermal barrier coating through employing a laser transmission method to excite an IR thermal wave, and the device comprises a signal generator, a power amplifier, a pulse laser, an IR thermal imager and an industrial control computer. The method comprises the steps: employing low-power and high-power pulse laser to carry out the thermal excitation of a thermal barrier coating base body side; collecting the temperature information of the coating side through the IR thermal imager; carrying out the linear fitting of the temperature difference-frame number curve data points under the two types of power; solving the slope and intercept of the fitting line; substituting the thermal diffusivity of the thermal barrier coating and the collection frame frequency of the IR thermal wave, and calculating and obtaining the thickness of the thermal barrier coating. The method overcomes the limitation of a conventional method for detecting the thickness of a thermal barrier coating through employing a coating side flash lamp for the thermal excitation of an IR thermal wave, and the surface of the coating does not need to be painted, so there is no paint layer thickness error and paint pollution risks. The method is wide in application range, and can test the thickness of an alloy base body thermal barrier coating with the poor thermal conductivity and big thickness. Meanwhile, the method employs a non-contact mode, is large in observation area, and is high in accuracy.

Description

technical field [0001] The invention belongs to the technical field of infrared thermal wave non-destructive detection, and in particular relates to a thermal barrier coating thickness laser transmission method excitation infrared thermal wave detection device and method. Background technique [0002] Thermal Barrier Coatings (TBCs for short) is one of the most advanced high-temperature protective coatings at present. room, etc.) surface protection. Thermal barrier coatings generally have a double-layer structure, consisting of a surface ceramic layer and an inner metal bonding layer. The thickness is a key technical indicator characterizing the quality of thermal barrier coatings, which is related to the service life, bonding strength, and Evaluation and calculation of uniform internal stress and manufacturing cost, etc. Therefore, thickness detection is a key technical link in the manufacture and use of thermal barrier coatings. At present, the thickness detection of the...

Claims

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Application Information

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IPC IPC(8): G01B11/06
CPCG01B11/0658
Inventor 李永君肖俊峰朱立春张炯高斯峰唐文书南晴
Owner HUANENG POWER INTERNATIONAL
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