Investigation of adding Cr2O3 on mechanical properties and high temperature oxidation behavior of Stellit6 coating prepared by plasma spraying on IN-738

Subject Areas :

mostafa  tahari ¹ (Instructor, Engineering Department, Esfarayen University of Technology, Iran)
Mohammad  Gavahian ² (Engineering Department, Esfarayen University of Technology, Iran)
Mohammad  Jahanbaze ³ (Engineering Department, Esfarayen University of Technology, Iran)
Mohammad  Najafi ⁴ (Engineering Department, Esfarayen University of Technology,)

Received: 2017-01-15 Accepted : 2017-03-10 Published : 2017-05-22

Keywords: stellite6, high temperature oxidation, plasma spray, Composite coating,

Abstract :

In this study, the effect of adding chromium oxide on mechanical properties and high temperature oxidation behavior of thermal sprayed stellite 6 coating on IN-738 has been investigated. For this purpose, first the 0, 10, 20 and 30 %wt. Cr2O3 powder added to satellite6 and plasma sprayed on the IN_738 substrate after mixing by mechanical milling. The optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffractometer (XRD) and micro-hardness used for micro-structure, porosity and phase analysis investigation. The isothermal oxidation behavior of composite coatings at 650, 750 and 850 ° C for 50 hours were evaluated. Results shows, the stellit6 / %10wt. Cr2O3 coating has the lowest oxidation rate. On the other hand, this coating shows the higher hardness other than non-reinforcement coating. The phase analysis investigation shows that the Cr2O3 oxide layer is forms during oxidation process on the surface of coatings. Its shows the Cr2O3 reinforcement is preferred areas for chromium oxides in thermal grown oxide (TGO) during oxidation

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