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An investigation of the effect of processing conditions on the microstructure of vacuum plasma-sprayed Ti–Zr–Ni quasicrystal coatings

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Abstract

Ti41.5Zr41.5Ni17 (at.%) powders from two batches having different size fractions have been vacuum plasma sprayed to form coatings using different sets of spray parameters. The powders are composed mainly of the HCP alpha and Laves phases which transform to i-phase owing to rapid quenching during plasma spraying. The coatings are examined using image analysis, hardness tester, XRD, SEM, and TEM. TEM studies revealed that the coating has a microstructure constituted by extremely fine grains. It has been observed that the polycrystalline to i-phase transformation occurs in both coatings irrespective of the differences in starting powder size and other spray parameters.

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Acknowledgments

The authors would like to thank Mr C Schwendimann for his support in the preparation of metallographic samples and Mr M Aeberhard for the X-ray diffractometry work. The metallography team of EMPA Thun is acknowledged for the stimulating discussions and support for SEM work.

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Authors and Affiliations

  1. Department of Mechanical Engineering, IIT Kharagpur, Kharagpur, 721302, India

    P. P. Bandyopadhyay

  2. EMPA, Feuerwekerstrasse 39, 3602, Thun, Switzerland

    Siegmann

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  1. P. P. Bandyopadhyay
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  2. Siegmann
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Correspondence to P. P. Bandyopadhyay.

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Bandyopadhyay, P.P., Siegmann An investigation of the effect of processing conditions on the microstructure of vacuum plasma-sprayed Ti–Zr–Ni quasicrystal coatings. J Coat Technol Res 5, 379–383 (2008). https://doi.org/10.1007/s11998-008-9100-1

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