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| Abstract No.: |
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| Title: |
Optimization of plasma spray processing parameters for deposition of YSZ+Al2O3 coating
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| Authors: |
Ekrem Altuncu / Kocaeli University Hereke Borusan Campus
Vocational School of Asim Kocabiyik, Technical Programs
Sakarya University, Thermal Spray Research and Application Laboratory(Collab), Turkey
Demet Kütükçü / Sakarya University, Turkey
Sefer Cem Okumus/ Sakarya University/ Dept. of Metal. Mats. Sci., Turkey
Fatih Üstel/ Sakarya University / Thermal Spray Tech. R&D Center, Turkey
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| Abstract: |
The plasma spray process is widely used as a coating technique for thermal barrier coating application in gas turbines. In this study Y2O3 stabilized ZrO2 (YSZ)+Al2O3 mixture was deposited on IN718 superalloys. A Taguchi style, orthogonal array L9 design of experiment was employed to evaluate the effect of three plasma processing variables on coating attributes. The plasma gun (F4MB) parameters varied were current (575-625A), argon primary gas flow (40 nlpm), and hydrogen secondary gas flow (8-12 nlpm). The resulting as-sprayed coating attributes evaluated were thickness, microhardness, surface roughness, and porosity. The results of the study indicate that higher plasma current lead to better powder deposition, and lower porosity for this particular air plasma spray (APS) application.
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