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2621 |
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Microstructural characterization of YSZ and YSZ/Al2O3 TBCs with HVOF CoNiCrAlY bond coatings |
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Abdullah Cahit Karaoglanli / Bartin University, Engineering Faculty, Metallurgical and Materials Engineering Department, Turkey Ekrem Altuncu/ Kocaeli University, Vocational School of Asim Kocabiyik, Turkey Ahmet Turk/ Sakarya University, Department of Metallurgical and Materials Engineering , Turkey Fatih Üstel/ Sakarya University, Department of Metallurgical and Materials Engineering , Turkey Ismail Ozdemir/ Bartin University, Department of Metallurgical and Materials Engineering, Turkey Ibrahim El-Araby/ Faculty of Engineering and Material Science, Engineering Design and Production Department, German University, Egypt |
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Thermal barrier coatings (TBC) are protective and developed material systems. TBCs include of metalic substrate, a top coating made of ceramic, a bond coating made of metallic and also thermally gradient oxide (TGO) coat which occurs during the coating process and advances on the service by means of bond coating getting oxide. In this study, microstructure of the produced layers and mechanical properties in TBCs were investigated. Inconel 600 substrates with TBCs composed of YSZ top (ZrO2 + 8 wt.% Y2O3) and YSZ/Al2O3 with CoNiCrAlY bond coats are investigated. For the deposition of CoNiCrAlY bond coats HVOF technique was used. The ceramic top layer was produced by APS. The microstructure and mechanical properties of the coatings discussed and compared. The microstructure investigations include optical and scanning electron microscopy, EDXS and XRD and microhardnes tests. The microstructure and mechanical properties of the coatings discussed and compared. |