Sliding wear characterization of microwave-glazed plasma-sprayed ceramic composites

Abstract The main objective of the present study is to present the wear characteristics of post-processed plasma deposits of alumina-titania (AT-13) ceramic composites under high-speed sliding. Spray deposits were post-processed (microwave glazed) by way of exposing them to microwave radiation at a...

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Bibliographic Details
Published in:Proceedings of the Institution of Mechanical Engineers. Part J, Journal of engineering tribology Journal of engineering tribology, 2010-05, Vol.224 (5), p.497-511
Main Authors: Sharma, A K, Krishnamurthy, R
Format: Article
Language:English
Subjects:
Acoustic emission
Aluminum oxide
Brittle fracture
Ceramics
Ceramics industry
Coating
Composite materials
Deformation mechanisms
Deformation wear
Densification
Deposition
Deposits
Emission
Engineers
Exposure
Factor analysis
Fractography
Frictional wear
Hardness
Heating
High speed
Holes
Mechanical engineering
Microwaves
Phase transitions
Plasma spraying
Porosity
Sliding
Sliding friction
Surface stability
Tribology
Wear
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Summary:Abstract The main objective of the present study is to present the wear characteristics of post-processed plasma deposits of alumina-titania (AT-13) ceramic composites under high-speed sliding. Spray deposits were post-processed (microwave glazed) by way of exposing them to microwave radiation at a frequency of 2.45 GHz in a multi-mode cavity by using the microwave hybrid heating principle. During ‘microwave glazing’, densification of the coating's structure takes place as a consequence of microwave-heating-induced phase transformation, leading to significant enhancement in hardness and reduction in porosity. Responses of the as-sprayed and microwave-glazed composites were monitored while they were subjected to sliding type of tribocontact at a speed of 5 m/s. Subsequent analyses are presented in terms of wear rate, pressure-velocity-time (p-v-t) characteristics, fractography, elemental count, and acoustic emission (AE) emanated during the trials. The results show a steady sliding wear response after an initial higher rate. The p-v-t factor analysis confirms a better operating condition with glazed composites. Glazed composites exhibit higher stability towards elemental transfer between the wear surface and the counter surface. AEs emanating during trials indicate deformation and brittle fracture as the dominating wear mechanisms of the as-sprayed and microwave-glazed ceramic composites.
ISSN:1350-6501
2041-305X
DOI:10.1243/13506501JET692