Evaluation of advanced materials. Final report
Cemented tungsten carbides with a binder level in the range of 5 to 6 percent exhibited the best resistance to erosion for this class of materials. Other practical cermet meterials were diamond - Si/SiC, Al/sub 2/O/sub 3/-B/sub 4/C-Cr, and B/sub 4/C-Co. SiAlON exhibited erosion resistance equivalent to the best WC-cermet. The only coating system to show promise of improved erosion resistance was CVD TiB/sub 2/ on cemented TiB/sub 2/-Ni. Cracking and/or spalling of a TiC coating and a proprietary TMT coating occurred in the standard slurry erosion test. Ranking of cemented tungsten carbide materials in the laboratory erosion test was the same as that found in service in the Wilsonville pilot plant. Specimens from the Fort Lewis pilot plant which performed well in service exhibited low erosion in the laboratory test. A substitute slurry, was found to be 2 to 4 times more erosive than the coal-derived slurry 8 wt% solids. Ranking of materials in the substitute slurry was nearly identical to that in the coal-derived slurry. Three modes of erosion were: ductile cutting; elastic-plastic indentation and fracture; and intergranular fracture. Erosion of a given material was closely related to its microstructure. In the substitute slurry, the angle-dependence of erosion of two forms of SiC, hot-pressed and sintered, were similar, but the sintered material eroded slower. Laser fusing of preplaced powder mixtures can produce cermet-like structures with potential for erosive and sliding wear resistance. TiC particles in Stellite 6 matrix proved less prone to cracking than WC particles in the same matrix. 74 figures, 14 tables.
- Research Organization:
- Battelle Columbus Labs., OH (USA)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 6433409
- Report Number(s):
- DOE/NBM-3007365; ON: DE83007365
- Country of Publication:
- United States
- Language:
- English
Similar Records
Erosive wear of selected materials for fossil energy applications
Erosion resistance of FeAl-TiB{sub 2} and FeAl-WC at room and elevated temperatures
Related Subjects
010405 -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
36 MATERIALS SCIENCE
360205* -- Ceramics
Cermets
& Refractories-- Corrosion & Erosion
ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BORIDES
BORON CARBIDES
BORON COMPOUNDS
CARBIDES
CARBON COMPOUNDS
CERMETS
CHALCOGENIDES
CHROMIUM ALLOYS
COAL LIQUEFACTION PLANTS
COAL LIQUIDS
COATINGS
COBALT ALLOYS
COMPOSITE MATERIALS
CONTROL EQUIPMENT
CORROSIVE EFFECTS
DISPERSIONS
EQUIPMENT
EROSION
FLOW REGULATORS
FLUIDS
FUEL SLURRIES
FUELS
FUNCTIONAL MODELS
HEATING
INDUSTRIAL PLANTS
LASER-RADIATION HEATING
LIQUIDS
MATERIALS
MATERIALS TESTING
MIXTURES
NITRIDES
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PILOT PLANTS
PLASMA HEATING
PNICTIDES
PROTECTIVE COATINGS
SILICON CARBIDES
SILICON COMPOUNDS
SILICON NITRIDES
SLURRIES
SRC PROCESS
SUSPENSIONS
TESTING
TITANIUM BORIDES
TITANIUM CARBIDES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TUNGSTEN CARBIDES
TUNGSTEN COMPOUNDS
VALVES
VELOCITY