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عنوان URL للمقالة


رقم المقالة : 1118-JMATPRO (R1) زيارة : 145 الصفحة: 51 - 58

نوع المخطوط: ابحاث

Investigation of oxidation behavior and Thermal spray of mechanically milled CoNiCrAlY–YSZ powders

الموضوعات :

Mostafa Tahari 1 , Morteza Shamanian Esfahani 2 , Mehdi Salehi 3

1 - Department of Materials Engineering, Isfahan University of Technology, Isfahan, Iran.
2 - Department of Materials Engineering, Isfahan University of Technology, Isfahan, Iran.
3 - Department of Materials Engineering, Isfahan University of Technology, Isfahan, Iran.

تاريخ الإرسال : 09 الأحد , محرم, 1436 تاريخ التأكيد : 27 الجمعة , صفر, 1436 تاريخ الإصدار : 10 الأحد , جمادى الأولى, 1436

الکلمات المفتاحية: CoNiCrAlY, Oxidation behavior, YSZ, High velocity oxy-fuel,

ملخص المقالة :

In this study, the effects of mechanical milling and YSZ reinforcing on oxidation behavior of CoNiCrAlY coatings were investigated. Various amounts of YSZ particles (0%, 5%, 10% and 15 wt.%) were mixed with commercial CoNiCrAlY powder and milled for 24 hrs. Then, the mechanically milled and commercial powders were deposited on Inconel 617 substrate using High Velocity Oxygen-Fuel (HVOF) process. Freestanding bodies of nanostructured and conventional HVOF CoNiCrAlY coatings were oxidized at 1000 °C for different times to form the thermally grown oxide layer. X-ray diffraction analysis, scanning electron microscopy and X-ray mapping were used to analyze the scales formed on the surface of the oxidized samples. The results showed that nanostructured coatings exhibited higher porosity due to undesirable morphology of feedstock powders. This factor accelerated diffusion rate of oxygen into coating body. On the other hand, undesireable oxidation of nanostructured particles during spraying leads to increase in the oxidation rate of coatings.

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