ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract A thermal wave technique for the non-destructive examination of plasma-sprayed coatings is described. Measurements of molybdenum NiAl and aluminium coatings are presented to demonstrate that the technique can be used for defect detection, coating thickness determination and thermal property evaluation. The effects observed are shown to be attributable to thermal wave interference in the coating material. A semiquantitative model of the coating microstructure is presented to compare its effects on the propagation of ultrasonic and thermal waves. The model predicts the coating material's very high attenuation of ultrasonic waves and a very low attenuation for thermal waves. This is taken to explain the success of thermal waves, and the failure of ultrasonic waves, in producing measurable interference effects in plasma-sprayed coatings.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00585740
