Development and High Temperature Property Evaluation of Ni-Co-Cr-Al Composite Electroforms

Srivastava, Meenu and Siju, - and Balaraju, JN and Ravisankar, B (2015) Development and High Temperature Property Evaluation of Ni-Co-Cr-Al Composite Electroforms. Journal of Materials Engineering and Performance, 24 (5). pp. 1937-1944. ISSN 1059-9495

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Ni-Co-Cr-Al composite electroforms were developed with cobalt content of 10 and 40 wt.%. Cr and Al nano-particles were suspended in sulphamate electrolyte and co-deposited in the Ni-Co matrices. The surface morphology was investigated using field emission scanning electron microscope and the composition analyzed by energy-dispersive x-ray analysis. The oxidation resistance of the electroforms was studied from 600 to 1000 �C. The weight gain of Ni-10 wt.%Co-Cr-Al was less (better oxidation resistance) compared to Ni-Cr-Al and Ni-40 wt.%Co-Cr-Al. The x-ray diffraction studies revealed that the oxidation product formed on the surface of Ni-Cr-Al and Ni-10 wt.%Co-Cr-Al consisted of NiO and Al2O3, while Ni-40 wt.%Co-Cr-Al comprised oxides such as NiCo2O4, CrO3, CoO, NiO, and Al2O3. The hot corrosion behavior was investigated in 75%Na2SO4 + 25%NaCl environment at 800 �C. It was found that the hot corrosion resistance of the composite coating improved with increase in cobalt content. The probable composition suitable for high-temperature applications was found to be Ni-10 wt.%Co-Cr-Al.

Item Type: Article
Additional Information: Copyright to this article belongs to M/s. ASM International
Uncontrolled Keywords: Electroform;High temperature coatings;Hot corrosion;Metal matrix composites;Ni-Co-Cr-Al;Oxidation
Subjects: AERONAUTICS > Aeronautics (General)
Depositing User: Ms. Alphones Mary
Date Deposited: 17 Aug 2015 05:02
Last Modified: 17 Aug 2015 05:02

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