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首页> 外文期刊>Electronic Journal Technical Acoustics >Laser optoacoustic method of porosity measurement of gas-thermal coatings on a metal substrate
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Laser optoacoustic method of porosity measurement of gas-thermal coatings on a metal substrate

机译：激光光声法测量金属基材上气热涂层的孔隙率

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Laser optoacoustic method is suggested for determination of porosity (volume fraction of pores) of Al_(2)O_(3) coatings manufactured by plasma gas-thermal spraying on a steel substrate. The technique is based on laser thermooptical excitation of probe ultrasonic pulses, the measurement of the phase velocity of longitudinal acoustic waves in a coating sample impregnated with an immersed liquid (distilled water, ethanol or kerosene), and calculation of porosity using the theoretical model of ultrasound propagation in a two-phase medium. The thickness of coatings is 160...540 mm, the measured porosity values are in the range 7...23 %, the best relative accuracy of measurements is 12...13%. The experimental results coincide within inaccuracy limits with the hydrostatic weighing data.
机译：建议用激光光声法测定通过等离子气体热喷涂在钢基材上制备的Al_（2）O_（3）涂层的孔隙率（孔的体积分数）。该技术基于对探头超声脉冲的激光热光激发，浸渍液（蒸馏水，乙醇或煤油）浸渍涂层样品中纵向声波的相速度的测量，以及使用超声在两相介质中的传播。涂层的厚度为160 ... 540 mm，测得的孔隙率值在7 ... 23％的范围内，最佳的相对测量精度为12 ... 13％。实验结果与静水称重数据的误差范围一致。

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