Development of nano-crystalline cold sprayed Ni-20Cr coatings for high temperature oxidation resistance

Title
Development of nano-crystalline cold sprayed Ni-20Cr coatings for high temperature oxidation resistance
Authors
M. KumarH. SinghH. Singh홍성민최인석서진유N.M. ChavanS. KumarS.V. Joshi
Keywords
High-temperature oxidation; Oxide scale; Cold-spray; Boiler steel; Thermal spraying
Issue Date
2015-03
Publisher
Surface & coatings technology
Citation
VOL 266, NO 25, 122-133
Abstract
In the current investigation a pre-synthesized nano-crystalline Ni–20Cr powder was deposited by cold-spray technique on SA 516 steel. The powder was synthesized by ball milling approach. The nano-crystallinity of the developed coating was established by crystallite size measurements from XRD profile, which was further endorsed by TEM analysis. High-temperature oxidation behavior of uncoated and coated samples was studied under cyclic isothermal conditions at 900 °C for 50 cycles in a laboratory tube furnace. The oxidation rates for the bare and coated steel were evaluated in terms of weight gain data. Different characterization techniques, such as X-ray diffraction (XRD), scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS), and transmission electron microscopy (TEM) analyses were utilized to characterize the oxide scale. The hardness and oxidation resistance of the steel increased after the application of coating. The reduction in oxidation rate of the base steel was 94%. Moreover, the developed nanostructured coating was observed to reduce weight gain by 64% in comparison with micron-sized Ni–20Cr cold spray coating thus offers a higher oxidation resistance. This may be attributed to relatively denser structure, lower porosity and lower oxide content of the nanostructured coating.
URI
http://pubs.kist.re.kr/handle/201004/49714
ISSN
02578972
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KIST Publication > Article
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