Characterization of boride-based powders and detonation gun sprayed cermet coatings
- Tampere Univ. of Technology (Finland)
Detonation gun sprayed (DGS) cermet coatings containing complex ternary transition metal boride as hard particles dispersed in a stainless steel or nickel based superalloy matrix have been characterized. Microstructure of the coatings, as well as powders, were studied with optical microscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD) and analytical transmission electron microscopy (AEM). X-ray microanalysis of the coatings were carried out using energy dispersive X-ray spectrometer (EDS) attached to the SEM and AEM. Moreover, abrasion wear resistance of the coatings was evaluated with a rubber wheel abrasion test equipment. The general microstructure of studied coatings appeared to be heterogeneous in the terms of the distribution, size and crystallographic nature of the phases. Nonetheless, very low porosities were obtained and in the coatings the oxide phase as well as the unmelted particles and the formation of oxide phase were avoided by optimization of DGS parameters. So far the abrasive wear resistance of boride-based cermet coatings is not so good as that of the WC-12Co coatings.
- OSTI ID:
- 379566
- Report Number(s):
- CONF-9509182--; ISBN 0-87170-541-9
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BORIDES
CERMETS
CHEMICAL COMPOSITION
CHROMIUM ALLOYS
ELECTRON DIFFRACTION
EXPERIMENTAL DATA
FLAME SPRAYING
IRON ALLOYS
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NICKEL ALLOYS
OPTICAL MICROSCOPY
PHASE STUDIES
POWDERS
SCANNING ELECTRON MICROSCOPY
TRANSMISSION ELECTRON MICROSCOPY
WEAR RESISTANCE
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY