2015

NiCr Bağ Kaplamaya Sahip Termal Bariyer Kaplama (TBC) Sisteminin Mekanik Alaşımlama Yöntemi Kullanılarak Üretilen CaO-MgO-Al2O3-SiO2 (CMAS) Tozları ile Korozyon Davranışlarının İncelenmesi

Malzemelerin yüzey özelliklerinin geliştirilmesi ve çevresel şartlara daha iyi uyum sağlayabilmesi amacıyla geçmişten günümüze birçok alanda tercih edilen Termal bariyer kaplamalar (TBCs) uzay ve havacılık sanayisinde yaygın olarak kullanılmaktadır. TBC’ler çalışma koşulları esnasında erozyon, sıcak korozyon, oksidasyon ve CaO-MgO-Al2O3-SiO2 (CMAS) gibi hasar mekanizmalarına maruz kalmaktadır. Tüm bu hasar mekanizmalarından dolayı TBC sistemlerinde dökülmeler ve bozulmalar meydana gelmektedir. Bu çalışmada, Inconel 718 süper alaşım altlık malzeme üzerine NiCr içeriğine sahip metal tozları bağ kaplama olarak, YSZ (ZrO2–8wt.%Y2O3) içeriğine sahip seramik tozlar ise, üst kaplama olarak altlık üzerine kaplanmıştır. Atmosferik Plazma Sprey (APS) yöntemi kullanılarak üretilen TBC sistemleri üretimlerinin ardından, mekanik alaşımla yöntemiyle üretilen CMAS camsı yapısı eşliğinde korozyon testlerine tabi tutulmuşlardır. Gerçekleştirilen CMAS testleri öncesi ve sonrasında TBC sistemlerinin mikroyapısal ve mekaniksel özellikleri ileri karakterizasyon teknikleri kullanılarak incelenmiştir.

Anahtar Kelimeler:

Mekanik Alaşımlama, CaO-MgO-Al2O3-SiO2 (CMAS), Termal Bariyer Kaplamalar (TBCs), Atmosferik Plazma Sprey (APS) Kaplama, NiCr

Investigation of Corrosion Behavior of Thermal Barrier Coating (TBC) System with NiCr Bond Coating with CaO-MgO-Al2O3-SiO2 (CMAS) Powders Produced Using the Mechanical Alloying Method

Thermal barrier coatings (TBCs), which are preferred in many areas from past to present, are widely used in the space and aviation industry in order to improve the surface properties of materials and to better adapt to environmental conditions. TBCs are exposed to erosion, hot corrosion, oxidation and damage mechanisms such as CaO-MgO-Al2O3-SiO2 (CMAS) during working conditions. Due to all these damage mechanisms, spills and deteriorations occur in TBC systems. In this study, metal powders with NiCr content were coated on the Inconel 718 superalloy substrate as a bond coating, and ceramic powders with YSZ (ZrO2–8wt.% Y2O3) were coated on the substrate as a top coating. TBC systems produced using the Atmospheric Plasma Spray (APS) method were subjected to corrosion tests after their production, accompanied by the glassy structure of CMAS produced by the mechanical alloy method. Before and after the CMAS tests, the microstructural and mechanical properties of TBC systems were examined using advanced characterization techniques.

Keywords:

Mechanical Alloying, CaO-MgO-Al2O3-SiO2 (CMAS), Thermal Barrier Coatings (TBCs), Atmospheric Plasma Spray (APS) Coating, NiCr,

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