Method of measuring thickness of thermal barrier coating by ultrasonic water-immersion focusing technology
A thermal barrier coating, water immersion focusing technology, applied in the direction of using ultrasonic/sonic/infrasonic waves, measuring devices, instruments, etc., can solve the difficult problem of accurate measurement of coatings with thickness less than 100 microns, and high requirements for flaw detectors and probe frequency bands. Achieve the effect of low cost, low frequency requirement and wide application range
Active Publication Date: 2013-09-11
DALIAN UNIV OF TECH
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Problems solved by technology
Compared with the existing coating thickness measurement methods such as ultrasonic microscope and ultrasonic surface wave, it should have the advantages of low cost of measuring equipment and small equipment volume; at the same time, the traditional ultrasonic longitudinal wave method has high requirements on the frequency band of flaw detectors and probes, and it is difficult to Limitations such as accurate measurement of coatings with a thickness of less than 100 microns
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[0027] The ultrasonic testing system of the method for measuring the thickness of thermal barrier coatings by ultrasonic water immersion focusing technology consists of figure 1 The shown water tank, ultrasonic water immersion point focusing probe with a nominal frequency of 20MHz (known focal length F=19.0mm), XYZ three-dimensional stepping device, ultrasonic flaw detector, DPO4032 digital oscilloscope and computer constitute. It uses the following measurement steps:
[0028] (1) Using the calibrated ultrasonic testing system, place the water-immersion point-focused probe on the surface of a stainless steel substrate with a thickness of h=2.3mm and immerse it in a water tank to ensure that the axis of the main sound beam of the water-immersion point-focused probe is perpendicular to the surface of the stainless steel substrate , adjust the distance between the probe and the stainless steel substrate to be about F=19mm, the focus of the sound beam is focused on the surface of ...
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The invention discloses a method of measuring the thickness of a thermal barrier coating by ultrasonic water-immersion focusing technology and belongs to the technical field of ultrasonic nondestructive testing. An ultrasonic test system comprising a water tank, an ultrasonic water-immersion point focusing probe, an X-Y-Z-dimensional stepping device, an ultrasonic flaw detector, a digital oscilloscope and a computer is provided. Ultrasonic generated by the system is allowed to enter a thermal barrier coating / metal matrix structure; refracted transverse wave is generated on a matrix / water interface; the ultrasonic passes through the matrix / coating interface, the coating / water interface and the like; an aliasing signal is received by the probe; power spectrum of sound pressure reflection coefficient in the aliasing signal is calculated; the thickness of the coating is measured by measuring the speed of the transverse wave of the thermal barrier coating and reading an accurate fm. The 50-250 micrometer thickness of the thermal barrier coating can be measured by the conventional water-immersion point focusing probe and the measurement system. Compared with the ultrasonic thickness measurement method, the method has the advantages that the complexity degree of the detection system is greatly reduced, the cost of the system is also greatly reduced, and the economic and social benefits are great.
Description
technical field [0001] The invention relates to a method for measuring the thickness of a thermal barrier coating by using ultrasonic water immersion focusing technology, which belongs to the technical field of ultrasonic nondestructive testing and evaluation of materials. Background technique [0002] Using thermal barrier coatings to increase the operating temperature of engine blades and other hot-end components is a very economical and effective technical approach, and the thickness and uniformity of thermal barrier coatings directly affect the final heat insulation effect. In the process of on-site coating construction and quality inspection, the thickness of the sprayed thermal barrier coating is required to meet the qualified standard. An accurate and reliable non-destructive testing method for the thickness of thermal barrier coatings is an urgent engineering demand in this field. [0003] A variety of non-destructive testing methods can be used to test the thicknes...
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Inventor 林莉马志远罗忠兵李广凯雷明凯
Owner DALIAN UNIV OF TECH