Abstract
In this study, methods for the evaluation of integrity
and elasticity of thermally sprayed ceramic coatings have
been developed. The main difficulty faced in the
evaluation of the elasticity of ceramic coatings is the
influence of the metallic substrate material on the
values measured. Therefore the results may not be purely
representing the properties of the coating. There is,
however, a need to characterize the coatings used in
industrial applications also during service.
In this work, a new type of ultrasonic transducer for the
measurement of propagation velocities of ultrasonic waves
in coatings was developed. The novel structure of the
transducer is based on the use of a piezoelectric plastic
foil as the active ultrasonic element. The applicability
of the transducer was tested with numerous coated
specimens.
| Original language | English |
|---|---|
| Qualification | Doctor Degree |
| Awarding Institution |
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| Supervisors/Advisors |
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| Award date | 14 Nov 1997 |
| Place of Publication | Espoo |
| Publisher | |
| Print ISBNs | 951-38-5078-1 |
| Publication status | Published - 1997 |
| MoE publication type | G4 Doctoral dissertation (monograph) |
Keywords
- ceramic coatings
- sprayed coatings
- ultrasonic tests
- elastic properties
- piezoelectric transducers
- acoustic velocity