Mikrostruktura powłokowych barier cieplnych natryskiwanych metodą APS z zastosowaniem nowych proszków ceramicznych
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Abstract
W artykule przedstawiono wyniki badań mikrostruktury oraz odporności na utlenianie powłokowych barier cieplnych wytworzonych metodą APS. Jako podłoże zastosowano stop Rene 80. międzywarstwę stanowił wieloskładnikowy stop meCrAlY. Zewnętrzną warstwę ceramiczną stanowiły proszki tlenku cyrkonu stabilizowane tlenkami itru, magnezu i wapnia. Proszki te mogą być stosowane zarówno w procesie natryskiwania metodą APS, jak i w warunkach obniżonego ciśnienia LPPS. Badania przeprowadzono z zastosowaniem mikroskopii świetlnej i elektronowej mikroskopii skaningowej. Wykonane zostały także pomiary porowatości wytworzonej warstwy. Wykazano, że zastosowanie nowych proszków ceramicznych zapewnia możliwość wytworzenia powło- kowych barier cieplnych, jednak ich maksymalna temperatura pracy, poza konwencjonalnym tlenkiem cyrkonu stabilizowanym tlenkiem itru, jest niższa i nie zapewnia ochrony przed utlenianiem powierzchni elementów silnika lotniczego.
The microstructure of thermal barrier coatings sprayed by APS with new ceramic powders
Abstract
The article presents the results of microstructure and oxidation resistance of thermal barrier coatings produced by APS. Rene 80 alloy is used as substrate and meCrAlY alloy as an interlayer. For outer ceramic layer are used zirconium oxide powders stabilized with yttrium, magnesium and calcium oxides. These powders may be used in both the APS spraying method as in conditions of low pressure LPPS. The study was carried out with the use of light microscopy and scanning electron microscopy. The effective porosity of layer were also measured. It shows that the use of new ceramic powders provides the ability to produce thermal barrier coatings, but their maximum operating temperature, except the conventional zirconium oxide stabilized with yttrium oxide, is lower and does not provide protection against oxidation of the surface of air- craft engine components.
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