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99049 Intermetallic-Ceramic Coatings for Metals Protection Against Erosion-Corrosion at High Temperatures

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Product Number: 51300-99049-SG
ISBN: 99049 1999 CP
Author: A. Beliaev, B. Q. Wang and A. Verstak
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A series of erosion-corrosion (E-C) tests was carried out on the NiAl-Al2O3 interrnetallic-ceramic coatings deposited with high-velocity oxygen-fiel method (HVOF). The tests attempted to simulate the erosion conditions at the heat exchanger tubes in coal-fired boilers. The E-C behavior of these coatings was investigated and compared with other thermal sprayed coatings. It was found that comparing to other coatings, eroded by the bed ash at 300°C, the HVOF NiAl-40Al2O3 coating exhibited the lowest thickness loss at a 90° impact angle, and was the second best at a 30° impact angle. Eroded by the fly ash under test temperatures 450-600°C, the HVOF NiAl-40Al2O3 coating demonstrated the highest erosion-corrosion resistance at all impact angles of testing. At temperatures below 200°C, the E-C wastage of the HVOF NiAl-40Al2O3 coating had essentially no dependence on temperature. From 200°C to 600°C the coating thickness loss increased and from 600 to 800°C the thickness loss decreased with temperature. The HVOF NiAl-40Al2O3 coating eroded by cracking and chipping brittle mechanism. Keywords: interrnetallic-ceramic temperature coatings, erosion, corrosion, erodent particle, impact angle
A series of erosion-corrosion (E-C) tests was carried out on the NiAl-Al2O3 interrnetallic-ceramic coatings deposited with high-velocity oxygen-fiel method (HVOF). The tests attempted to simulate the erosion conditions at the heat exchanger tubes in coal-fired boilers. The E-C behavior of these coatings was investigated and compared with other thermal sprayed coatings. It was found that comparing to other coatings, eroded by the bed ash at 300°C, the HVOF NiAl-40Al2O3 coating exhibited the lowest thickness loss at a 90° impact angle, and was the second best at a 30° impact angle. Eroded by the fly ash under test temperatures 450-600°C, the HVOF NiAl-40Al2O3 coating demonstrated the highest erosion-corrosion resistance at all impact angles of testing. At temperatures below 200°C, the E-C wastage of the HVOF NiAl-40Al2O3 coating had essentially no dependence on temperature. From 200°C to 600°C the coating thickness loss increased and from 600 to 800°C the thickness loss decreased with temperature. The HVOF NiAl-40Al2O3 coating eroded by cracking and chipping brittle mechanism. Keywords: interrnetallic-ceramic temperature coatings, erosion, corrosion, erodent particle, impact angle
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