Use of Different Process Gases for Manufacturing Isolating Alumina Coatings by Flame Spraying with Cords

Abstract Besides conventional industrial demands, thermally sprayed coatings are increasingly used for innovative products. Such an application is the additive manufacturing of electrical components in automotive engineering. In particular, heating units currently manufactured by a combination various spray technologies. At present, simpler spraying processes like flame investigated with regard to their suitability as future cost-effective alternative fabricating isolating alumina coatings. present study, cords were flame-sprayed using compressed air and argon atomizing gases. The results demonstrate finely dispersed microstructures more regular partially even higher surface volume resistivity compared past investigations literature well conventionally plasma-sprayed despite significantly reduced coating thickness. content alpha phase clearly than coatings, regardless gas used. Moreover, reveal comparison air. While found mainly influence ideal stand-off distance, composition not changed severely. addition kinematics, it can finally be concluded that humidity plays major role properties.