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Vojnotehnički glasnik
2014, vol. 62, br. 2, str. 7-26
jezik rada: engleski
vrsta rada: izvorni naučni članak
doi:10.5937/vojtehg62-3793


Uticaj brzine dovoda praha na svojstva plazma naprskane hromkarbid 25% nikal hrom prevlake
Institut za mikrotalasnu tehniku i elektroniku / IMTEL, Beograd

e-adresa: drmrdakmihailo@gmail.com

Projekat

Mikromehanički kriterijumi oštećenja i loma (MPNTR - 174004)
Razvoj tehnologije izrade obloge i jezgra na bazi domaćih sirovina za proizvodnju specijalnih obloženih elektroda namenjenih za elektrolučno zavarivanje čelika (MPNTR - 34016)

Sažetak

Plazma-sprej postupak je vodeća tehnologija deponovanja praha u cilju izrade prevlaka koje imaju široku primenu u avio-industriji za zaštitu novih i opravku pohabanih delova. Kermet prevlake 75Cr3C2 - 25Ni(Cr) na bazi Cr3C2 karbida imaju veliku primenu za zaštitu delova, jer zadržavaju visoke vrednosti tvrdoće, čvrstoće i otpornosti na habanje do temperature od 850°C. Ovaj rad razmatra uticaj parametara plazma-sprej depozicije praha 75Cr3C2 - 25Ni(Cr) na strukturu i mehaničke karakteristike prevlake. Prah je deponovan plazma-sprej postupkom na atmosferskom pritisku (APS). Pri izboru parametara kao plazma gas koristio se helijum, koji je inertan i ne reaguje sa prahom, proizvodi gušću plazmu sa manjim toplotnim sadržajem i manje inkorporira okolni vazduh u mlaz plazme, što smanjuje temperarturno razlaganje i dekarburizaciju karbida Cr3C2. U istraživanju su deponovane tri grupe prevlaka sa tri različite brzine dovoda praha od 30, 45 i 60 g/min. Prevlaka sa najboljim karakteristikama deponovana je na ulaznoj prirubnici dela turbo-mlaznog motora TV2-117A da bi se smanjio uticaj vibracija i habanja. Analizirane su strukture i mehaničke karakteristike 75Cr3C2 - 25Ni(Cr) prevlaka u skladu sa standardom Pratt & Whitney. Istraživanja su pokazala da brzine dovoda praha bitno utiču na mehaničke osobine i strukture75Cr3C2 - 25Ni(Cr) prevlaka.

Ključne reči

osobine; prah; plazma; brzina dovoda; prevlaka; hrom

Reference

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