Investigation of the Oxidation and Hot Corrosion Behavior of a MCrAlY and ZrO2+Y2O3 containing Thermal Barrier Coating (TBC) System Produced by the Atmospheric Plasma Spray (APS) Method at 750°C

Year 2023, Volume: 15 Issue: 2, 404 - 415, 14.07.2023

Derviş Özkan , Garip Erdogan , Gülfem Binal , Yasin Ozgurluk , Abdullah Cahit Karaoglanlı

https://doi.org/10.29137/umagd.1232816

Abstract

In this study, a metallic bond coat with MCrAlY content and a yttria-stabilized zirconia (YSZ) ceramic topcoat were deposited on the Inconel 718 Ni-based superalloy substrate using the atmospheric plasma spray (APS) coating method. The produced TBC system was tested under oxidation and hot corrosion conditions, and its microstructural properties and changes were investigated. At 750 °C, isothermal oxidation tests were performed for 5, 25, 50 and 75 hours. Hot corrosion tests were carried out at 750°C for time periods of 1, 3 and 5 hours using mixtures of 45% Na2SO4 and 55% V2O5. The high-temperature behavior of the TBC system against the main damage mechanisms such as isothermal oxidation and hot corrosion was determined, and its microstructural changes were investigated in detail. It has been observed that factors affecting the TBC system's strength and microstructural changes under high temperature conditions include the composition of the components that comprise the TBC system, the temperature and time processes in which the tests are conducted, the components that constitute the hot corrosion environment, and their ratios.

Keywords

Thermal barrier coating (TBC), MCrAlY, ZrO2+Y2O3 (YSZ), Atmospheric plasma spray (APS), Isothermal oxidation, Hot corrosion, Termal bariyer kaplama (TBC), Atmosferik plazma sprey (APS), İzotermal oksidasyon, Sıcak korozyon

Atmosferik Plazma Sprey (APS) Yöntemi ile Üretilmiş MCrAlY ve ZrO2+Y2O3 içerikli Termal Bariyer Kaplama (TBC) Sisteminin 750°C Sıcaklıktaki Oksidasyon ve Sıcak Korozyon Davranışlarının İncelenmesi

Abstract

Bu çalışmada, Inconel 718 Ni-esaslı süper alaşım altlık malzeme üzerine MCrAlY içeriğine sahip metalik bağ ve itriya ile stabilize edilmiş zirkonya (YSZ) seramik üst kaplamalar atmosferik plazma sprey (APS) kaplama yöntemi kullanılarak üretilmiştir. Üretilen TBC sistemi oksidasyon ve sıcak korozyon koşulları altında test edilerek, mikroyapısal özellikleri ve oluşan değişimleri
incelenmiştir. İzotermal oksidasyon testleri 750°C’de 5, 25, 50 ve 75 saatlik zaman süreçlerinde gerçekleştirilmiştir. Sıcak korozyon testleri 750°C’de 1, 3 ve 5 saatlik zaman süreçlerinde %45 Na2SO4 ve %55 V2O5 oranlarındaki karışımlar kullanılarak gerçekleştirilmiştir. TBC sisteminin izotermal oksidasyon ve sıcak korozyon gibi ana hasar mekanizmalarına karşı yüksek sıcaklık davranışları belirlenerek, mikroyapısal değişimleri ayrıntılı olarak incelenmiştir. TBC sistemini oluşturan bileşenlerin içerikleri, testlerin gerçekleştirildiği sıcaklık ve zaman süreçleri ile sıcak korozyon ortamını oluşturan bileşenler ve oranlarının TBC sisteminin yüksek sıcaklık koşullarında dayanımını ve mikroyapısal değişimlerini belirleyen faktörler olduğu görülmüştür.

Keywords

ZrO2+Y2O3 (YSZ), Termal bariyer kaplama (TBC), MCrAlY, Atmosferik plazma sprey (APS), İzotermal oksidasyon, Sıcak korozyon

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