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| Abstract No.: |
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Scheduled at:
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Friday, June 09, 2017, Hall 27 2:40 PM
Plasma Spraying II
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| Title: |
Alloying and deposition of nickel and aluminum by LPPS and VLPPS to be applied as electrodes for electrolysis
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| Authors: |
Diana Marcano* / Forschungszentrum Jülich GmbH, Germany
Georg Mauer/ Forschungszentrum Juelich GmbH, Germany
Robert Vaßen/ Forschungszentrum Juelich GmbH, Germany
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| Abstract: |
Low Pressure Plasma Spraying (LPPS) is a processing method which is used for the manufacture of bond coats using Ni-Co based alloys. In the present work, the F4 torch with two feeding tubes is applied to alloy Nickel and Aluminum during spraying. Coatings were performed using an Ni-Al alloy with 69:31 at% Ni:Al, Inconel 738, and an Al powder as initial feedstocks. The Ni-Al alloys and the Al powder were fed simultaneously and independently through the two feeding tubes. They were sprayed using the lower input power limit of the LPPS process, at typical rather hot bond coat parameters, and also very low pressure plasma spraying (VLPPS) conditions. As supports, stainless steel and a very thin Ni mesh were used.
The aim of this work was the development of structures with increased porosity, high specific surface area values and Ni:Al compositions in the range of the Raney Ni composition in order to be applied as electrodes for electrolysis. Process parameters, such as spraying distance, powder feed rate and carrier gas flux were varied in order to obtain increased Al contents in the coatings. The results show that alloying occurs due to melting of the Ni-Al alloy and in addition due to evaporation and condensation of the independently fed Al powder. It was possible to obtain alloys with different phases and microstructures ranging from dense to porous.
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