Microstructural characterization of small-particle plasma spray coatings
Abstract
The microstructure of a small-particle plasma spray (SPPS) aluminum oxide coating sprayed onto a prepared mild steel substrate has been characterized using a variety of microscopic techniques as part of a process optimization study. The coating was highly conforming to the substrate as evidenced in high-resolution transmission electron microscopy, although some voids were present at the interface. The layered splat microstructure, characteristic of conventional plasma-sprayed coatings but smaller in size, was discerned in partially thinned samples in a focused-ion- beam scanning electron microscope (FIB-SEM). Microcracks and microporosity, generally less than 0.5 μm in size, was also seen between splats using transmission electron microscopy. Cubic alumina of the crystallographic form γ-Al_2O_3 was identified by electron diffraction.
Additional Information
© 1999 The American Ceramic Society. Manuscript No. 190198. Received May 11, 1998; approved January 29, 1999. Supported by the U.S. Department of Energy, Federal Energy Technology Center, Cooperative Agreement No. DE-FC21-92MC29061. Additional support for A. R. de Arellano-López was provided by the Northwestern University–Universidad de Sevilla Cooperative Exchange Program and by the Spanish CICYT, Project MAT97-0562-C02-01. We thank Steve Wilhelm for preparing the coatings and T. Bernecki, J. Mawdsley, Y. J. Su, and R. Trice for reading and assistance with the manuscript.Additional details
- Eprint ID
- 49404
- DOI
- 10.1111/j.1151-2916.1999.tb02063.x
- Resolver ID
- CaltechAUTHORS:20140908-181324717
- DE-FC21-92MC29061
- Department of Energy (DOE)
- Northwestern University–Universidad de Sevilla Cooperative Exchange Program
- MAT97-0562-C02-01
- Comisión Interministerial de Ciencia y Tecnología (CICYT)
- Created
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2014-09-09Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field