High temperature erosion-oxidation behavior of thermal sprayed nickel-chromium and chromium carbide coatings
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2008
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INTERNATIONAL CONFERENCE ON AEROSPACE SCIENCE AND TECHNOLOGY
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This paper presents the high temperature erosion-oxidation (E-O) behavior of HVOF
coatings of Ni20Cr alloy and Cr3C2-25(Ni20Cr). The E-O measurements were made in a test rig in
the temperature range 500-850° C, using alumina particles as the erodent at impact velocities in the
range 2.5–19.5 ms-1. At low impact velocities the coatings did not exhibit any change in E-O
behavior up to 500-600° C, compared to that at 100° C. However at higher temperatures, wastage
increased with temperature, reaching a maximum at 700º C and then decreased with further
increase in temperature up to 800° C. At temperatures above 800° C, wastage increased again. The
E-O mechanism of these two coatings was quite similar. Changes in E-O wastage are attributed to
regime change from ‘substrate dominated’ to ‘oxide modified’. At higher erodent impact velocities a
significant increase in E-O wastage of the coatings was observed. Using surface roughness as the
criterion to compare E-O behavior of the coatings, E-O maps were constructed for the two coatings.
Regions corresponding to low, moderate and severe wastage were defined and shown in the maps to
aid in qualitative selection of conditions for safe use of the coatings.
Como referenciar
KUNIOSHI, C.T.; CORREA, O.V.; RAMANATHAN, L.V. High temperature erosion-oxidation behavior of thermal sprayed nickel-chromium and chromium carbide coatings. In: INTERNATIONAL CONFERENCE ON AEROSPACE SCIENCE AND TECHNOLOGY, June 26-28, 2008, Bangalore, India. Proceedings... Disponível em: http://repositorio.ipen.br/handle/123456789/15969. Acesso em: 30 Dec 2025.
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