The relative erosion-corrosion resistance of commercial thermal sprayed coatings in a simulated circulating fluidized bed combustor environment

Conference · Sat Dec 31 00:00:00 EST 1994

OSTI ID:160438

Wang, B Q; Luer, K ^[1]

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

Bed ash and fly ash samples were retrieved from operating circulating fluidized bed combustor (CFBC) boilers firing three different fuels: anthracite culm, bituminous coal, and biomass. Using these materials, the relative erosion-corrosion resistance of three commercially available thermal sprayed coatings and one weld overlay specimen was determined in an elevated temperature erosion tester. Erosion test conditions attempted to simulate the erosive conditions found at the refractory/bare-tube interface on the combustor waterwall and in the convection pass of the superheater tube banks of a CFBC. The coatings included DenSys DS-200 (a proprietary HVOF Cr{sub 3}C{sub 2}-NiCr cermet coating), Rokide C (a flame-sprayed Cr{sub 2}O{sub 3}-6SiO{sub 2}-4Al{sub 2}O{sub 3} ceramic coating) and Armacor M (an arc-sprayed FeCrSiB metallic coating). The weld overlay was Smooth arc 250 onto low carbon steel. Erosion test results were compared to erosion test results for AISI 1018 and ASTM SA213-T22 steel specimens. The results indicated that the DS-200 coating had the highest erosion-corrosion resistance among the target materials due to its compactness, high density, fine grain structure and a homogeneous distribution of the skeletal network of hard carbides/oxides within a ductile and corrosion-resistant metallic binder.

• OSTI ID: 160438
• Report Number(s): CONF-940684-; ISBN 0-87170-509-5; TRN: IM9603%%20
• Resource Relation: Conference: 1994 national thermal spray conference, Boston, MA (United States), 20-24 Jun 1994; Other Information: PBD: 1994; Related Information: Is Part Of 1994 Thermal spray industrial applications: Proceedings; Berndt, C.C.; Sampath, S. [eds.] [State Univ. of New York, Stony Brook, NY (United States). Dept. of Materials Science and Engineering]; PB: 816 p.
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
20 FOSSIL-FUELED POWER PLANTS
01 COAL, LIGNITE, AND PEAT
09 BIOMASS FUELS
CERMETS
CORROSION RESISTANCE
EROSION
CHROMIUM CARBIDES
NICKEL ALLOYS
CHROMIUM ALLOYS
OXIDES
FOSSIL-FUEL POWER PLANTS
BOILERS
COAL
COMBUSTION
BIOMASS
INTERMETALLIC COMPOUNDS
CHROMIUM OXIDES
SILICON OXIDES
ALUMINIUM OXIDES
IRON ALLOYS
SILICON ALLOYS
BORON ALLOYS
SPRAYED COATINGS
FLY ASH
PARTICLE SIZE
WEIGHT MEASUREMENT
X-RAY DIFFRACTION
CHEMICAL COMPOSITION
HARDNESS
POROSITY
MORPHOLOGY
CRACKS