CN104034287B - A kind of elastic anisotropy metallic matrix thermal barrier coating thickness ultrasonic measurement method - Google Patents
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- 239000011159 matrix material Substances 0.000 title claims abstract description 87
- 239000012720 thermal barrier coating Substances 0.000 title claims abstract description 53
- 238000000691 measurement method Methods 0.000 title claims abstract description 7
- 239000000523 sample Substances 0.000 claims abstract description 82
- 238000001228 spectrum Methods 0.000 claims abstract description 42
- 238000000034 method Methods 0.000 claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000002604 ultrasonography Methods 0.000 claims abstract description 11
- 238000012937 correction Methods 0.000 claims abstract description 6
- 239000000284 extract Substances 0.000 claims abstract description 6
- 229920001971 elastomer Polymers 0.000 claims abstract description 3
- 239000000806 elastomer Substances 0.000 claims abstract description 3
- 239000011248 coating agent Substances 0.000 claims description 42
- 238000000576 coating method Methods 0.000 claims description 42
- 238000001514 detection method Methods 0.000 claims description 18
- 239000011247 coating layer Substances 0.000 claims description 15
- 230000009466 transformation Effects 0.000 claims description 15
- 238000005070 sampling Methods 0.000 claims description 7
- 238000007654 immersion Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 8
- 238000009683 ultrasonic thickness measurement Methods 0.000 abstract description 6
- 238000007689 inspection Methods 0.000 abstract description 2
- 230000001066 destructive effect Effects 0.000 abstract 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 22
- 229910052759 nickel Inorganic materials 0.000 description 11
- 229910000601 superalloy Inorganic materials 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 8
- 229910001220 stainless steel Inorganic materials 0.000 description 6
- 239000010935 stainless steel Substances 0.000 description 6
- 239000006185 dispersion Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001000 micrograph Methods 0.000 description 2
- 238000010606 normalization Methods 0.000 description 2
- 229910002077 partially stabilized zirconia Inorganic materials 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000008199 coating composition Substances 0.000 description 1
- 230000006854 communication Effects 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
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Abstract
A kind of elastic anisotropy metallic matrix thermal barrier coating thickness ultrasonic measurement method, belongs to ultrasonic non-destructive inspection techniques field。It adopts and a set of includes the ultrasonic pulse-echo method C-scan thickness measuring system that ultrasonic C-scanning device, water logging point focusing probe, digital oscilloscope and computer collectively form, respectively to detected sample and reference coupon measurement。For elastic anisotropy metallic matrix thermal barrier coating sample ultrasound echo signal, correction factor Δ γ by definition, extract the ultrasound data of all of which Δ γ > 0, and calculate its normalized power spectrum Gm (f), read the resonant frequency fn in Gm (f) effective band, in conjunction with known thermal barrier coating longitudinal wave velocity c, bring sound pressure reflection coefficient power spectrum resonance frequency expression into and can realize elastic anisotropy metallic matrix thermal barrier coating thickness measure。The method effectively overcomes the phenomenons such as the ultrasonic waveform distortion owing to base elastomer anisotropy causes and frequency shift and causes the problem that thermal barrier coating ultrasonic thickness measurement result error is bigger。
Description
Technical field
The present invention relates to a kind of elastic anisotropy metallic matrix thermal barrier coating thickness ultrasonic measurement method, it belongs to the technical field of Ultrasonic NDT。
Background technology
Adopting the operating temperature that thermal barrier coating improves the hot-end components such as engine blade is the very cost-effective technological approaches of one, and thermal barrier coating thickness and uniformity thereof directly influence final effect of heat insulation。At the scene in coating decoration and quality inspection process, it is desirable to the thermal barrier coating thickness of spraying reaches criterion of acceptability。Thermal barrier coating thickness non-destructive testing method is the urgent engineering demand in this field accurately and reliably。
Existing multiple lossless detection method can be used for the measurement of thermal barrier coating thickness, mainly has the methods such as eddy-current method, infrared method, microwave method and supercritical ultrasonics technology。Wherein eddy-current method is based between probe and matrix and is changed, by coating layer thickness, the Lift-off effect caused carries out thickness measuring, and thickness measuring result is bigger by the impact of tack coat。Infrared method is the infrared ray absorbing corresponding wavelength according to detected coating under ultrared irradiation, analyzes and processes absorbed intensity and coating just can carry out thickness measurement, and the factor such as thickness measuring precision exposure time, coating composition uniformity affects bigger。Microwave method is to be preferably suitable to the sensitiveest wave band of coating detection before detection, and by measuring the information of echo reflection coefficient phase and then calculating thick coating angle value, the method is still in the laboratory research stage。Ultrasonic method is measured thermal barrier coating thickness and is mainly included ultrasonic microscope, ultrasonic surface wave, three kinds of technology of ultrasonic pulse-echo。Ultrasonic microscope technology is to utilize high-frequency ultrasonic that specimen material top layer and internal structure are carried out the technology of lossless micro-imaging, and its testing cost is high, detect system complex, the method is higher to the requirement of coating surface flatness simultaneously。Ultrasonic surface wave technical basis sound wave dispersion equation in the coating, by measuring coating phase velocities dispersion curve, coating layer thickness is calculated then in conjunction with inversion technique, owing to thermal barrier coating thickness is many at some tens of pm to hundred micron dimensions, therefore the surface wave frequency excited needed for is many in 40MHz-200MHz scope, at present many exciting by laser, the factor such as low yet with optoacoustic conversion efficiency, echo-signal is weak and detection sensitivity is low limits its application。Traditional ultrasonic pulse-echo technology utilizes the path difference of interface reflected P-wave before and after coating or two adjacent resonant frequencies of corresponding frequency spectrum, realizes the measurement of coating layer thickness in conjunction with the longitudinal wave velocity of coating。Owing to longitudinal wave velocity is big, extremely short during propagation sound in coating, the method is measured thickness thermal barrier coating less than hundred microns and is typically required more than 40MHz bandwidth, thus causes ultrasonic radio-frequency component to be decayed by force, wave distortion etc., it is difficult to implement measurement。Lin Li etc. propose the technology of a kind of ultrasonic longitudinal wave low-angle incidence wave mode converted measurement thermal barrier coating thickness, experiment adopts the water logging point focusing probe of conventional dominant frequency 20MHz, to the yittrium oxide PSZ (Y of the thickness range 66～100 μm of preparation on stainless steel base2O3Partiallystabilizedzirconia, YSZ) coating carried out ultrasonic thickness measurement, and result is accurately and reliably。But, for the metallic matrix thermal barrier coating sample being representative with nickel base superalloy, owing to dendritic segregation and recrystallization can occur matrix in preparation process, cause that it exists elastic anisotropy, ultrasound wave communication process wherein can cause the phenomenon such as wave distortion and frequency shift, and then cause thermal barrier coating thickness measure to be forbidden。The problem that above method all can not effectively solve this type of elastic anisotropy metallic matrix thermal barrier coating thickness nondestructive measurement。
Summary of the invention
By ultrasonic pulse-echo method C-scan thickness measuring system, the anisotropy of elastic anisotropy metallic matrix is characterized, and define the correction factor Δ γ of an elastic anisotropy metallic matrix thermal barrier coating thickness measuring, Δ γ=γani-c-γiso-c。When Δ γ≤0, the elastic anisotropy of metallic matrix is bigger on the impact of coating thickness measuring, it is difficult to accurately measure coating layer thickness；As Δ γ > 0, metallic matrix elastic anisotropy is little on the impact of coating thickness measuring, extracts the Ultrasonic data of all Δ γ > 0, and calculates its normalized power spectrum Gm (f)；Read the resonant frequency f in Gm (f) effective bandn, in conjunction with known thermal barrier coating longitudinal wave velocity c, bring sound pressure reflection coefficient power spectrum resonance frequency expression into and can realize thermal barrier coating thickness measure；The method overcome the problem that thermal barrier coating ultrasonic thickness measurement result error that metallic matrix elastic anisotropy causes is bigger。
The technical solution adopted for the present invention to solve the technical problems is: a kind of elastic anisotropy metallic matrix thermal barrier coating thickness ultrasonic measurement method, it is characterized in that: it adopts the ultrasonic pulse-echo method C-scan thickness measuring system that a ultrasonic C-scanning device, water logging point focusing probe, digital oscilloscope and computer collectively form, respectively elastic anisotropy metallic matrix thermal barrier coating sample, elastic isotropy metallic matrix thermal barrier coating sample, elastic anisotropy metallic matrix sample being carried out ultrasound detection, concrete detecting step is as follows:
(1) first defining the correction factor Δ γ of an elastic anisotropy metallic matrix thermal barrier coating thickness measuring, expression formula is:
Δ γ=γani-c-γiso-c(1)
Wherein γani-cRepresent ultrasound echo signal power spectrum (hereinafter referred to as " power spectrum ") the frequency shift coefficient of elastic anisotropy metallic matrix thermal barrier coating sample, γiso-cRepresent that before and after coating, interface echo interferes the power spectrum frequency shift coefficient caused；Use γaniRepresenting the power spectrum frequency shift coefficient that elastic anisotropy metallic matrix causes, the expression formula of γ is:
Wherein fiFor tested sample power spectrum dominant frequency, f0Initial spike power spectrum dominant frequency for water logging point focusing probe；
(2) ultrasonic pulse-echo method C-scan thickness measuring system has been calibrated, water logging point focusing probe is placed in above elastic anisotropy metallic matrix sample, adjusting water immersion focusing probe makes Main beam axis vertical with specimen surface, by acoustic beam focal point in matrix surface, gather an initial spike as reference signal J, signal J is carried out Fourier transformation and obtains its power spectrum and read the dominant frequency f of correspondence0And the effective band that-6dB is corresponding；Then by acoustic beam focal point in matrix bottom surface, by the output gate locating of C-scan in matrix Bottom echo position, whole matrix sample is carried out C-scan detection；Gather the echo-signal that C-scan result difference grayscale position is corresponding, and the matrix Bottom echo in intercept signal carries out Fourier transformation, obtain the power spectrum M of its correspondence, add up dominant frequency fani, calculate, according to formula (2), the frequency shift coefficient gamma that each sampling point position is correspondingani；
(3) water logging point focusing probe is placed in above elastic isotropy metallic matrix thermal barrier coating reference coupon, adjusts water logging point focusing probe and make Main beam axis vertical with specimen surface, by acoustic beam focal point in matrix bottom surface；By the output gate locating of C-scan in matrix Bottom echo position, whole sample is carried out C-scan detection；Then gathering corresponding echo-signal in C-scan result difference grayscale position, the matrix Bottom echo intercepted in all signals carries out Fourier transformation, obtains the power spectrum M of its correspondence and adds up the dominant frequency f of its correspondenceiso-c, calculate, according to formula (2), the frequency shift coefficient gamma that each sampling point position is correspondingiso-c；
(4) water logging point focusing probe is placed in above elastic anisotropy metallic matrix thermal barrier coating sample, equally by the output gate locating of C-scan in matrix Bottom echo position, whole sample is carried out C-scan detection；Gather echo-signal corresponding to C-scan result difference grayscale position, and intercept matrix Bottom echo and carry out Fourier transformation, obtain the power spectrum M of its correspondence and add up the dominant frequency f of its correspondenceani-c, calculate, according to formula (2), the frequency shift coefficient gamma that each sampling point position is correspondingani-c；More resilient anisotropy metallic matrix thermal barrier coating sample diverse location γani-cγ with corresponding thickness elastomeric isotropism metallic matrix thermal barrier coating sampleiso-cValue；When Δ γ≤0, γani-cNot only include interface echo before and after coating and interfere the frequency shift caused, also include the frequency shift γ that base elastomer anisotropy causesani, now utilize normalization amplitude spectrum resonant frequency to carry out coating thickness measuring, resultant error is relatively big, and thickness measuring result is unreliable；As Δ γ > 0, γani-cMainly include interface echo before and after coating and interfere the frequency shift caused, extract the data of all Δ γ > 0 and carry out coating thickness measuring；
(5) data that step (4) is extracted carried out Fourier transformation and is normalized for benchmark with signal J, obtaining its normalized power spectrum Gm (f), reading the resonant frequency value f in Gm (f) effective bandn, it is known that the longitudinal wave velocity c of this thermal barrier coating, brings sound pressure reflection coefficient power spectrum resonance frequency expression (3) into:
Wherein n is resonant frequency exponent number, takes positive integer value, and d is thermal barrier coating thickness, can be calculated the coating layer thickness of correspondence by expression formula (3)。
The invention have the advantages that: elastic anisotropy metallic matrix thermal barrier coating sample, elastic isotropy metallic matrix thermal barrier coating sample, elastic anisotropy metallic matrix sample are carried out ultrasound detection by ultrasonic pulse-echo method C-scan thickness measuring system by this invention respectively。By the correction factor Δ γ of definition, extract the ultrasonic echo data of all Δ γ > 0 of elastic anisotropy metallic matrix thermal barrier coating, and calculate its normalized power spectrum Gm (f), read the resonant frequency f in Gm (f) effective bandn, in conjunction with known thermal barrier coating longitudinal wave velocity c, bring sound pressure reflection coefficient power spectrum resonance frequency expression into and can realize thermal barrier coating thickness measure。The method not only overcomes and is currently used for the ultrasonic microscope of thermal barrier coating thickness measuring, ultrasonic surface wave, the deficiencies such as detection frequency that requirement that three kinds of technology of ultrasonic pulse-echo exist is high and hardware configuration, testing cost height, system complex, and efficiently solve the problem that coating ultrasonic thickness measurement resultant error that metallic matrix elastic anisotropy causes is bigger。The method is low to detection System Hardware Requirement, and easy to operate, cost is low。
Accompanying drawing explanation
Below in conjunction with drawings and Examples, patent of the present invention is described further。
Fig. 1 is ultrasonic pulse-echo method C-scan thickness measuring system。
Fig. 2 is reference signal J time domain waveform and corresponding power spectrum。
Fig. 3 is the C-scan result of nickel base superalloy matrix sample。
Fig. 4 is the power spectrum M and dominant frequency coefficient of deviation γ of nickel base superalloy matrix sampleani。
Fig. 5 is the C-scan result of the uniform stainless steel base YSZ coating sample of coating layer thickness 40～120 μm。
Fig. 6 is the frequency shift coefficient gamma of the uniform stainless steel base YSZ coating sample of coating layer thickness 40～120 μmiso-c。
Fig. 7 is the C-scan result of nickel base superalloy matrix YSZ coating sample。
Fig. 8 is the dominant frequency coefficient of deviation γ of nickel base superalloy matrix YSZ coating sampleani-c。
Fig. 9 is YSZ coating ultrasonic thickness measurement result and metallographic thickness measuring result。
Figure 10 is the electron scanning micrograph of YSZ coating sample cross section
Figure 11 is YSZ coating ultrasonic thickness measurement error analysis。
In Fig. 1: 1, computer, 2, DPO4O32 digital oscilloscope sample, 3, ultrasonic C-scanning device, 4, water logging point focusing probe, 5, sample, 6, sample bench。
Detailed description of the invention
This elastic anisotropy metallic matrix thermal barrier coating thickness ultrasonic measurement method adopts the ultrasonic pulse-echo method C-scan thickness measuring system shown in Fig. 1, and it is collectively formed by a SM-J38-300 ultrasonic C-scanning device, the water logging point focusing probe of nominal 25MHz, DPO4O32 digital oscilloscope and computer。Respectively to the nickel base superalloy matrix YSZ coating sample of nominal 60 μ m-thick, the uniform stainless steel base YSZ coating sample of coating layer thickness 40～120 μm, the measurement of nickel base superalloy matrix sample, the measuring process that it adopts is as follows:
(1) ultrasonic pulse-echo method C-scan thickness measuring system has been calibrated, nominal 25MHz water logging point focusing probe is placed in above nickel base superalloy matrix sample, adjusting water immersion focusing probe makes Main beam axis vertical with specimen surface, by acoustic beam focal point in matrix surface, gather an initial spike as reference signal J, see Fig. 2 (a)。It is carried out Fourier transformation obtain its power spectrum and see Fig. 2 (b), dominant frequency f0=23.25MHz, effective band corresponding for power spectrum-6dB is 13.75MHz～33.0MHz。Then by acoustic beam focal point in matrix bottom surface, by the output gate locating of C-scan in matrix Bottom echo position, whole elastic anisotropy metallic matrix sample being carried out C-scan detection, result is shown in Fig. 3；Gather echo-signal corresponding to C-scan result difference grayscale position, and intercept matrix Bottom echo and carry out Fourier transformation, obtain the power spectrum M of its correspondence, see Fig. 4 (a)。The dominant frequency f of statistics power spectrumani, calculate, according to formula (2), the frequency shift coefficient gamma that each sampling point position is correspondingani, such as Fig. 4 (b)。Figure can be seen that the frequency shift coefficient gamma of nickel base superalloy matrixaniBeing mainly distributed on-0.5～0 scope, matrix anisotropy causes ultrasound wave dominant frequency to low frequency offset。
(2) nominal 25MHz water logging point focusing probe is placed in above the uniform stainless steel base YSZ coating sample of coating layer thickness 40～120 μm, adjusting water logging point focusing probe makes Main beam axis vertical with specimen surface, by acoustic beam focal point in uniform stainless steel base bottom surface；By the output gate locating of C-scan in matrix Bottom echo position, whole sample being carried out C-scan detection, result is Fig. 5 such as。Then the echo-signal that C-scan result difference grayscale position is corresponding is gathered。Intercept matrix Bottom echo and carry out Fourier transformation, obtain the power spectrum M of its correspondence and add up the dominant frequency f of its correspondenceiso-c；The frequency shift coefficient gamma that coating layer thickness fluctuation 10% causes is calculated according to formula (2)iso-cScope, is shown in Fig. 6。The thickness measuring giving 23.25MHz probe in figure ranges for 40～90 μm。The thickness measuring that same method measures 15MHz probe is adopted to range for 60～120 μm。It is found that the method adopts low-frequency probe can measure bigger coating layer thickness, adopting high frequency probe can measure relatively thin coating layer thickness, the thickness measuring scope of other frequency probe needs to demarcate according to practical situation。
(3) nominal 25MHz water logging point focusing probe is placed in above the nickel base superalloy matrix YSZ coating sample of nominal 60 μ m-thick, equally by the output gate locating of C-scan in matrix Bottom echo position, whole sample is carried out C-scan detection, and result is Fig. 7 such as。Gather the echo-signal that arrow locations is corresponding in Fig. 7, and intercept matrix Bottom echo and carry out Fourier transformation, obtain the power spectrum M of its correspondence and add up the dominant frequency f of its correspondenceani-c；The frequency shift coefficient gamma of its correspondence is calculated according to formula (2)ani-cScope, is shown in Fig. 8；Relatively diverse location γani-cThe γ corresponding with 60 μ m thick in Fig. 6iso-c(γiso-c=0) value。If Δ γ≤0, γ is describedani-cNot only include interface echo before and after YSZ coating and interfere the frequency shift γ causediso-c, γ that matrix anisotropy causesaniAlso can not ignore, now utilize normalization amplitude spectrum resonant frequency to carry out coating thickness measuring, resultant error is bigger；If Δ γ > 0, it was shown that γani-cThe frequency shift γ caused is interfered essentially from interface echo before and after YSZ coatingiso-c, γ that matrix anisotropy causesaniCan ignore, extract the data of all Δ γ > 0 and carry out coating thickness measuring。
(4) data that step (3) is extracted carried out Fourier transformation and is normalized for benchmark with signal J, obtaining its normalized power spectrum Gm (f), reading Gm (f) resonant frequency value fn, it is known that this YSZ coating longitudinal wave velocity 4320m/s, brings sound pressure reflection coefficient power spectrum resonance frequency expression (3) into, can calculate the YSZ coating layer thickness of correspondence, see Fig. 9。Then dissecting sample, utilize metallographic method to determine YSZ coating layer thickness, the electron scanning micrograph of coating sample cross section is as shown in Figure 10。Figure 11 give the raw ultrasound method thickness measuring result of the nickel base superalloy matrix YSZ coating sample of nominal thickness 60 μm and revise after the ultrasonic method thickness measuring result absolute error corresponding with metallographic thickness measuring result, the bounded absolute error of raw ultrasound method thickness measuring result is-10.89～98.5 μm, statistical standard difference is 29.3 μm, and statistics relative error is 49.8%。After correction, the bounded absolute error of ultrasonic method thickness measuring result is-10.89～11.9 μm, and statistical standard difference is 5.07 μm, and statistics relative error is 9.9%。
Claims (1)
1. an elastic anisotropy metallic matrix thermal barrier coating thickness ultrasonic measurement method, it is characterized in that: it adopts the ultrasonic pulse-echo method C-scan thickness measuring system that a ultrasonic C-scanning device, water logging point focusing probe, digital oscilloscope and computer collectively form, respectively elastic anisotropy metallic matrix thermal barrier coating sample, elastic isotropy metallic matrix thermal barrier coating sample, elastic anisotropy metallic matrix sample being carried out ultrasound detection, concrete detecting step is as follows:
(1) first defining the correction factor Δ γ of an elastic anisotropy metallic matrix thermal barrier coating thickness measuring, expression formula is:
Δ γ=γani-c-γiso-c(1)
Wherein γani-cRepresent the ultrasound echo signal power spectrum frequency shift coefficient of elastic anisotropy metallic matrix thermal barrier coating sample, hereinafter referred to as " power spectrum frequency shift coefficient ", γiso-cRepresent that before and after coating, interface echo interferes the power spectrum frequency shift coefficient caused；Use γaniRepresenting the power spectrum frequency shift coefficient that elastic anisotropy metallic matrix causes, the expression formula of γ is:
Wherein fiFor tested sample power spectrum dominant frequency, f0Initial spike power spectrum dominant frequency for water logging point focusing probe；
(2) ultrasonic pulse-echo method C-scan thickness measuring system has been calibrated, water logging point focusing probe is placed in above elastic anisotropy metallic matrix sample, adjusting water immersion focusing probe makes Main beam axis vertical with specimen surface, by acoustic beam focal point in matrix surface, gather an initial spike as reference signal J, signal J is carried out Fourier transformation and obtains its power spectrum and read the dominant frequency f of correspondence0And the effective band that-6dB is corresponding；Then by acoustic beam focal point in matrix bottom surface, by the output gate locating of C-scan in matrix Bottom echo position, whole matrix sample is carried out C-scan detection；Gather the echo-signal that C-scan result difference grayscale position is corresponding, and the matrix Bottom echo in intercept signal carries out Fourier transformation, obtain the power spectrum M of its correspondence, add up dominant frequency fani, calculate, according to formula (2), the frequency shift coefficient gamma that each sampling point position is correspondingani；
(3) water logging point focusing probe is placed in above elastic isotropy metallic matrix thermal barrier coating sample, adjusts water logging point focusing probe and make Main beam axis vertical with specimen surface, by acoustic beam focal point in matrix bottom surface；By the output gate locating of C-scan in matrix Bottom echo position, whole sample is carried out C-scan detection；Then gathering corresponding echo-signal in C-scan result difference grayscale position, the matrix Bottom echo intercepted in all signals carries out Fourier transformation, obtains its power spectrum M and adds up the dominant frequency f of its correspondenceiso-c, calculate, according to formula (2), the frequency shift coefficient gamma that each sampling point position is correspondingiso-c；
(4) water logging point focusing probe is placed in above elastic anisotropy metallic matrix thermal barrier coating sample, equally by the output gate locating of C-scan in matrix Bottom echo position, whole sample is carried out C-scan detection；Gather echo-signal corresponding to C-scan result difference grayscale position, and intercept matrix Bottom echo and carry out Fourier transformation, obtain the power spectrum M of its correspondence and add up the dominant frequency f of its correspondenceani-c, calculate, according to formula (2), the frequency shift coefficient gamma that each sampling point position is correspondingani-c；More resilient anisotropy metallic matrix thermal barrier coating sample diverse location γani-cγ with corresponding thickness elastomeric isotropism metallic matrix thermal barrier coating sampleiso-cValue；When Δ γ≤0, γani-cNot only include interface echo before and after coating and interfere the frequency shift caused, also include the frequency shift γ that base elastomer anisotropy causesani；As Δ γ > 0, γani-cMainly include interface echo before and after coating and interfere the frequency shift caused, extract the data of all Δ γ > 0 and carry out coating thickness measuring；
(5) data that step (4) is extracted carried out Fourier transformation and is normalized for benchmark with signal J, obtaining its normalized power spectrum Gm (f), reading the resonant frequency value f in Gm (f) effective bandn, it is known that the longitudinal wave velocity c of this thermal barrier coating, brings sound pressure reflection coefficient power spectrum resonance frequency expression (3) into:
Wherein n is resonant frequency exponent number, takes positive integer value, and d is thermal barrier coating thickness, is calculated the coating layer thickness of correspondence by expression formula (3)。
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