| 摘要 |
PROBLEM TO BE SOLVED: To measure the thickness of an iron-based metal deposit thermally sprayed on an iron-based base nondestructively without being affected by the spray deposit and the quality of a base material. SOLUTION: An ultrasonic wave 4 is made incident from the top surface of the spray deposit 2 to the thermal spray base material 1 and the reflection time (t1) up to the return of the incident wave 4a to the top surface after reflection by the border surface 7 between the spray deposit 2 and base material 1 is measured. Then the thickness T1 of the spray deposit is calculated from a found sound velocity (v1) in the thermal spray film and the reflection time (t1). Further, a test piece having the same deposit is produced when the spray deposit is formed, the film thickness (T0) of the test piece is previously measured, and this and test piece are used for measurement to calculate the sound velocity (v1) in the spray deposit from the reflection time (t0).
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