Influence of nanocrystalline nickel powder on oxidation resistance of spark plasma sintered Ni-17Cr6.5Co1.2Mo6Al4W7.6Ta alloy.
Babalola, Bukola Joseph Maledi, Nthabiseng Shongwe, Mxolisi Brendon Bodunrin, Michael Oluwatosin Obadele, Babatunde Abiodun Olubambi, Peter Apata
Babalola, Bukola Joseph
Maledi, Nthabiseng
Shongwe, Mxolisi Brendon
Bodunrin, Michael Oluwatosin
Obadele, Babatunde Abiodun
Olubambi, Peter Apata
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Abstract
An investigation was carried out to evaluate the isothermal oxidation behavior of nickel based superalloys at 1100 degree Celsius for 120 h. The alloys which were microstructure and nanostructured were developed by spark plasma sintering system. The oxidation test was carried out at a temperature of 1100 degree Celsius in air at different exposure time up to 120 h. The nanostructured nickel based alloy possessed better oxidation resistance with the formation of continuous adherent alumina, chromia scales, and spinel on the alloy surface and with no significant internal oxides. The oxidation rate of NiO was observed to be lower in the nanostructured nickel superalloy due to low diffusion rate of Nickel. The oxidation kinetics followed a parabolic oxidation law.
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Date
2019-01-17
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Springer
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Keywords
Nickel based superalloy, Nanostructured, Spark plasma sintering, Isothermal oxidation, Mechanical milling