U ovom radu prikazani su rezultati razvoja ispitivanja i primene plazma i plamene prevlake Ni4.5Al. Plazma prevlaka se dobija raspršivanjem kompozitnog plazma praha u plazmi argona i vodonika i stopljene čestice praha se zakale iz tečne faze, te je stoga tvrdoća plazma prevlake visoka. Prikazani su rezultati mikrostrukturnih i strukturnih ispitivanja kao i mehaničkih. Prazma prevlake Ni4.5Al čvrsto se vezuju za osnovni materijal, dok je plazmena prevlaka, dobijena u kiseonično acetilenskom plamenu, kontrolisane poroznosti podložna abraziji, te obezbeđuje kontrolisane zazore među spregnutim delovima motora. Stoga se ove prevlake primenjuju za nanošenje na gasne zaptivke kompresora turbinskih motora mlaznih aviona.%Results of development, investigation and application of composite plasma and flame sprayed coatings of Ni4.5Al are presented. The plasma sprayed coatings are obtained from composite plasma powder Ni4.5Al and sprayed in plasma of mixed gases argon and hydrogen. The particles of plasma powder are melted in plasma and ultrarapidly quenched from liquid to solid state. Therefore the plasma coatings of special properties for extence a high hardnes are obtained. The microstructure and the structure and the mechanical properties are presented. The bonding coating of plasma sprayed Ni4.5Al has a high bonding strength with the basic material. This coating has a low porosity about 2% and therefore has a good anticorosity resistance. The flame sprayed coating of Ni4.5Al is the working coating and has a controled high porosity about 40%. This coating is abrodable and provides controled clearence between mating parts of engine. Therefore they are applied on the gas seal of compresors of jet engine.
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