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Spark Plasma Sintering of Yttria-Stabilized Zirconia/Titanium Nitride Composites

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Abstract

Composites of 8 mol% yttria-stabilized zirconia (YSZ) and titanium nitride (TiN) were obtained by mechanical mixing of commercial powders. High-density samples of (1-x) YSZ / x TiN, with x = 0, 25, 50, and 75 wt.%, were obtained by spark plasma sintering (SPS) at 1450 °C for 5 min. Surface contamination with carbon from the SPS was eliminated by diamond sawing of parallel surfaces. X-rays diffraction analyses showed that samples are composed by a mixture of the initial phases, without appreciable reaction as inferred from calculated lattice parameters. dc 4-probe electrical measurements in the 100-850°C under showed that samples have a metallic behavior, indicating that the percolation threshold was attained for the sample with the lowest content of the TiN (x=25 wt.%), which corresponds to ∼27 vol.%.

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Acknowledgments

Thanks are due to Dr. I. F. Machado (POLI-USP) for SPS. Dr. R. Muccillo (IPEN) for SEM analyses and to the partial financial support of IPEN-CNEN/SP and CN’Pq.

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Authors and Affiliations

  1. Nuclear and Energy Research Institute–IPEN, São Paulo, SP, 05508-000, Brazil

    Paulo S. M. Silva & Fabio C. Fonseca

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  1. Paulo S. M. Silva
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  2. Fabio C. Fonseca
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Silva, P.S.M., Fonseca, F.C. Spark Plasma Sintering of Yttria-Stabilized Zirconia/Titanium Nitride Composites. MRS Online Proceedings Library 1735, 45–49 (2014). https://doi.org/10.1557/opl.2015.155

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  • DOI: https://doi.org/10.1557/opl.2015.155

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