High Temperature Cyclic Oxidation Behavior of Ni and Co Based Superalloys

Deepa Mudgal, Surendra Singh, Satya Prakash

Department of Metallurgical & Materials Engineering, Indian Institute of Technology,Roorkee 247667, India.

DOI: 10.4236/jmmce.2012.113017                

Abstract

High temperature oxidation causes degradation of materials in aircraft, marine, industrial and land base gas turbines. To obviate this problem, oxidation behavior of Ni and Co based superalloys viz superni 600 and superco 605 (Midhani grade) has been studied in air at 900oC. Both superalloys go through cyclic oxidation which consists of 1 hr heating in silicon carbide tube furnace followed by 20 min cooling in ambient air. Weight change was taken by a digital electronic weighing balance having accuracy of 1 mg after each cycle. Exposed alloys were characterized by XRD, FESEM and EDS. Result shows that the Co base superalloy superco 605 shows less weight gain as compare to superni 600. The oxide layer mainly contains oxides of Cr₂O₃, NiO and spinel NiCr₂O₄.

Keywords

Cyclic oxidation, SEM, EDAX

Conflicts of Interest

The authors declare no conflicts of interest.

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