Microstructural characterization of small-particle plasma spray coatings
- Univ. de Sevilla (Spain). Dept. de Fisica de la Materia Condensada
- Northwestern Univ., Evanston, IL (United States)
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 {micro}m in size, was also seen between splats using transmission electron microscopy. Cubic alumina of the crystallographic form {gamma}-Al{sub 2}O{sub 3} was identified by electron diffraction.
- Sponsoring Organization:
- USDOE, Washington, DC (United States); Comision Interministerial de Ciencia y Tecnologia (Spain)
- DOE Contract Number:
- FC21-92MC29061
- OSTI ID:
- 684419
- Journal Information:
- Journal of the American Ceramic Society, Vol. 82, Issue 8; Other Information: PBD: Aug 1999
- Country of Publication:
- United States
- Language:
- English
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