Cermet composite thermal spray coatings for erosion and corrosion protection in combustion environment. Semi-annual report, August 14, 1996--January 14, 1997
Research is being conducted to determine the optimum ceramic/metal combination in thermally sprayed metal matrix composite coatings for erosion and corrosion resistance in new coal-fired boilers. The cermet composites will be produced using powder metallurgy and electrodeposition. Model Ni-Al{sub 2}O{sub 3} cermet coatings with varying alumina fractions were produced. During this period, powder processed and electrodeposited composites were tested in the erosion simulator (Al{sub 2}O{sub 3} erodent, 40 m/s velocity, 90{degree} impact angle) and their relative erosion resistances were determined. It was found that electrodeposited Ni-Al{sub 2}O{sub 3} composites containing small Al{sub 2}O{sub 3} particles (1{mu}m)s showed better erosion resistance than powder processed composites with large Al{sub 2}O{sub 3} particles (12{mu}m). Also, an increase in volume fraction of Al{sub 2}O{sub 3} particles in powder processed alloys led to decreased erosion resistance. For both powder processed and electrodeposited Ni-Al{sub 2}O{sub 3} composites, addition of hard Al{sub 2}O{sub 3} particles did not improve erosion resistance compared with pure Ni.
- Research Organization:
- Lehigh Univ., Bethlehem, PA (United States). Energy Research Center
- Sponsoring Organization:
- USDOE Assistant Secretary for Fossil Energy, Washington, DC (United States)
- DOE Contract Number:
- FG22-95PC95211
- OSTI ID:
- 492379
- Report Number(s):
- DOE/PC/95211--T3; ON: DE97052534
- Country of Publication:
- United States
- Language:
- English
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Cermet composite thermal spray coatings for erosion and corrosion protection in combustion environments of advanced coal-fired boilers. Semiannual technical progress report, August 14, 1996--January 14, 1997
Cermet composite thermal spray coatings for erosion and corrosion protection in combustion environments of advanced coal-fired boilers