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

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Abstract

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.

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Acknowledgments

The authors would like to thank the Director, NAL for permission to carry out this work as a Network Project NWP-00-51-01 in the Surface Engineering Division. A word of thanks to Mr. Karthick Raj and Mr. Shivarame Gowda for their assistance in carrying out the work.

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Authors and Affiliations

  1. Surface Engineering Division, Council of Scientific and Industrial Research – National Aerospace Laboratories, HAL Airport Road, Bangalore, 560017, India

    Meenu Srivastava,  Siju & J. N. Balaraju

  2. Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirappalli, 620015, India

    B. Ravisankar

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  1. Meenu Srivastava
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  2. Siju
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  3. J. N. Balaraju
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  4. B. Ravisankar
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Correspondence to Meenu Srivastava.

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Srivastava, M., Siju, Balaraju, J.N. et al. Development and High Temperature Property Evaluation of Ni-Co-Cr-Al Composite Electroforms. J. of Materi Eng and Perform 24, 1937–1944 (2015). https://doi.org/10.1007/s11665-015-1477-2

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  • DOI: https://doi.org/10.1007/s11665-015-1477-2

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