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Effect of Different Atomization Gases on the Properties of Cylinder Bore Coatings
Author(s) -
Bobzin Kirsten,
Öte Mehmet,
Königstein Tim
Publication year - 2019
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201800853
Subject(s) - materials science , coating , tribology , corrosion , deposition (geology) , combustion , thermal spraying , metallurgy , cylinder , nitrogen , thermal barrier coating , composite material , chemical engineering , mechanical engineering , chemistry , paleontology , organic chemistry , sediment , engineering , biology
Oxidation during coating deposition by means of thermal spraying is a widely investigated and discussed topic. Most of the studies dealing with this subject report negative influences of oxidation on the coating properties, especially with respect to corrosion behavior. On the other hand, positive effects are reported as well, especially with regard to tribological behavior. Within this study, the oxidation phenomena in Plasma Transferred Wire Arc (PTWA) spraying process is investigated in detail. This technology is primarily used to apply coatings on the inner surface of cylinder bores in combustion engines. It is shown that the oxidation can be suppressed effectively by utilizing an alternative atomization gas like nitrogen instead of compressed air without the need of any additional torch modification. Besides the oxidation behavior, further effects depending on the used atomization gas are observed, which influence the properties of the coatings. Significantly higher hardness values are measured for the coatings deposited with nitrogen. This is traced back to different impact and cooling conditions as well as chemical interactions of the in‐flight particles with the ambient atmosphere.