The evaluation of integrity and elasticity of thermally sprayed ceramic coatings by ultrasonics: Dissertation

Pentti Kauppinen

Research output: ThesisDissertationMonograph

3 Citations (Scopus)

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 languageEnglish
QualificationDoctor Degree
Awarding Institution
  • Aalto University
Supervisors/Advisors
  • Korhonen, Antti, Supervisor, External person
Award date14 Nov 1997
Place of PublicationEspoo
Publisher
Print ISBNs951-38-5078-1
Publication statusPublished - 1997
MoE publication typeG4 Doctoral dissertation (monograph)

Keywords

  • ceramic coatings
  • sprayed coatings
  • ultrasonic tests
  • elastic properties
  • piezoelectric transducers
  • acoustic velocity

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