Discussion on ultrasonic nondestructive evaluation method of coating performance

The article is mainly based on the method of ultrasonic non-destructive evaluation of sprayed coatings, according to the propagation time of ultrasonic pulses in the measured medium to calculate the ultrasonic sound velocity in thermal sprayed coatings, and the relationship between ultrasonic sound velocity and thermal sprayed coating properties for analysis. From the results of research and use, it is known that the relationship between the ultrasonic sound velocity in the coating and the porosity is that as the porosity increases, the ultrasonic sound velocity decreases. The relationship between the ultrasonic sound velocity in the coating and the microhardness is, as the microhardness As the hardness increases, the ultrasonic sound velocity also increases. The porosity and microhardness of the thermal sprayed coating are important indicators for evaluating the performance of the coating. Whether the coating performance is properly controlled will directly affect the service life of the coating, the Material consumption and cost, coating stress and coating bonding strength, etc. Conventional testing methods for coating properties such as coating thickness, porosity, microhardness, etc. Destruction can only be determined, and non-destructive testing methods are used to test certain performances without damaging the performance of the tested object.