The erosion-oxidation behavior of HVOF Cr{sub 3}C{sub 2}-NiCr cermet coating

Book · Fri Dec 30 23:00:00 EST 1994

OSTI ID:83065

Wang, B Q; Luer, K ^[1]

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1. Metalspray USA, Inc., Richmond, VA (United States)

DenSys DS-200 coating is a proprietary HVOF Cr{sub 3}C{sub 2}-NiCr cermet coating used in elevated temperature service environments including fluidized bed boilers, coal-fired boilers and municipal waste incinerators. The elevated temperature erosion-corrosion (oxidation) behavior of this HVOF Cr{sub 3}C{sub 2}-NiCr coating was investigated using a range of test temperatures, impact angles, erodents, and particle velocities. The erosion-corrosion behavior of HVOF Cr{sub 3}C{sub 2}-NiCr coatings was compared with 1018 steel and other thermal-spray coatings including FeCrSiB (Armacor M), Ni-base, Cr{sub 2}O{sub 3}-6SiO{sub 2}-4Al{sub 2}O{sub 3} (Rokide C), Cr{sub 2}O{sub 3}-12SiO{sub 2}-2Al{sub 2}O{sub 3}-4MgO (Rokide MBC), and WC-NiCrCo (SMI 712). It was found that the erosion-oxidation resistance of HVOF Cr{sub 3}C{sub 2}-NiCr coating was higher than 1018 steel and other coatings at both impact angles 30{degree} and 90{degree}. The erosion-oxidation behavior of coatings was well related to their morphology. The high erosion-oxidation resistance of the HVOF Cr{sub 3}C{sub 2}-NiCr coating was attributed to its low porosity, fine grain structure and homogeneous distribution of hard carbides/oxides which form a skeletal network within a ductile and corrosion-resistant metal binder.

• OSTI ID: 83065
• Report Number(s): CONF-940222--
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
09 BIOMASS FUELS
36 MATERIALS SCIENCE
ANTHRACITE
ASHES
BIOMASS
CERMETS
CHROMIUM ALLOYS
CHROMIUM CARBIDES
COMBUSTION
COMPARATIVE EVALUATIONS
CORROSION RESISTANCE
CORROSIVE EFFECTS
EROSION
EXPERIMENTAL DATA
FLUIDIZED-BED COMBUSTORS
HEAT EXCHANGERS
MICROSTRUCTURE
NICKEL ALLOYS
PROTECTIVE COATINGS