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Microstructure and Properties of Plasma Spray Coatings Prepared from Ti-Zr-Ni Quasicrystalline Powders

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Abstract:

This works deals with the deposition of Ti-Zr-Ni icosahedral quasicrystalline powders by low vacuum plasma spray technique and the performances of the resulting coating layers. The microstructure of the coatings, as analyzed by X-ray diffraction and TEM techniques, consisted of nanometer-sized W-Ti50Zr35Ni15 1/1 cubic approximant and TiZrNi Laves phases as well as a low volume fraction of submicrometer-sized ZrO2 phase. The absence of the icosahedral phase in the coating layers was explained by the loss of Ti during plasma spraying. The shift in the composition and the presence of the ZrO2 phase within the coating layers are believed to be responsible for the reduced microhardness and corrosion performances evaluated by electrochemical tests in a Hanks’ Balance Salt Solution at 37oC.

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Periodical:

Materials Science Forum (Volumes 534-536)

Pages:

89-92

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.534-536.89

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Online since:

January 2007

Authors:

Hyun Kwang Seok, Yu Chan Kim, Frédéric Prima, Eric Fleury

Keywords:

Corrosion, Microhardness, Plasma Spray Coating, Quasicrystal, Titanium (Ti)

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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DOI: 10.1114/1.1397790

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