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Untersuchung einer thermisch gespritzten Co-Basis-Legierung

: Grützner, H.; Krüger, B.; Rickel, J.

Metallographie-Tagung 1993
Metallographie-Tagung <1993, Aachen>
Conference Paper
Fraunhofer IFAM ()
Co-Legierung; Einschmelzprozeß; Flammspritzen; Hochgeschwindigkeitsflammspritzen; Selbstfließende Legierung; thermisches Spritzen

Great quantities of self fusing Ni or Co based alloys are processed every year by thermal spraying of wear and corrosion resistant coatings. Besides conventional flame spraying high velocity flame spraying (HVOF) is used increasingly, although the coatings are remelted and thus differences in quality should be equalised. Coatings of a cobalt alloy, trade name SF20, are difficult to process and exhibit distinct differences in hardness and porosity depending upon spraying and remelting process. HVOF-coatings are harder and porosity as well as oxide inclusions are smaller and distributed more evenly. Reasons for the differences in hardness and porosity are investigated for both types of coatings by metallographic investigations. Porosity after spraying, and heat input during remelting turned out to be the decisive influences on structure formation, hardness and porosity