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The application of ultrasonic phase spectrum of the reflection coefficient on nondestructive characterizing the plasma sprayed coatings irradiated by HIPIB

The application of ultrasonic phase spectrum of the reflecti...

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Fifth International Conference on Surface Engineering

作者： Y.ZHAo1,L.LIN1,X.M.LI1,M.K.LEI1 1 NDT & E Laboratory,School of Materials Science & Engineering,Dalian University of Technology,Dalian 116024,P.R.China 2 Surface Engineering Laboratory,School of Materials Science & Engineering,Dalian University of Technology,Dalian 116024,P.R.China

Ultrasonic phase spectrum of reflection coefficient has been used to nondestructively characterize the density,porosity,and microcracks of plasma sprayed cr2o3 coatings irradiated by high-intensity pulsed ion beam(HIPIB).The ultrasonic measurement was investigated using immersion focusing pulse echo method with a 25 MHz transducer and the phase spectrum of reflection coefficient has been experimentally *** relationship among velocity,density,attenuation coefficient and the phase spectrum was analyzed based on an acoustic transmission model in a multi-layered *** velocity relates to the harmonic frequency of the phase spectrum,and the density and attenuation coefficient play roles on the amplitude of the maximum and the shape of the *** effects of the three parameters(velocity,density and attenuation coefficient) on the amplitude of the maximum of the phase are *** critical value exists which change the relationship between the individual parameter and the *** one of the three parameters exceeds the corresponded critical value,the amplitude of the maximum decreases in the same form of y=Aexp(Bxn).For the as-sprayed and irradiated coatings with the thickness of 50 μm,the velocity calculated from the phase spectrum is 2522 m/s and 2772 m/s,harmonic frequency corresponding to 12.61 MHz and 13.86 MHz,*** ultrasonic determinations demonstrated that the coating became more densified after irradiation by HIPIB,which are in agreement with SEM *** phase spectrum itself is a good indicator to reveal differences between density and microstructures of coating prepared with various conditions as well as to follow their evolution after HIPIB *** method developed has found application in the problem of characterizing the coatings.

关键词： Ultrasonic Characterization Reflection Coefficient Phase Spectrum cr2o3 coatings Density

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