Abstract
The oxidation resistance of β-Sialon processed with Y2O3 sintering additive and β-Sialon/TiN composites containing 1–10 wt% TiN was studied using ion beam analysis (IBA) techniques, augmented by XRD and SEM measurements. Rutherford backscattering spectrometry was used to monitor the diffusion of Y and Ti in the oxidised samples, and the diffusion of oxygen and nitrogen was observed by particle-induced gamma emission and nuclear reaction analysis. These techniques showed that in the Sialon control sample without TiN, oxygen was the first element to migrate at 1000 °C, followed by Y and N at 1100 °C. At 1200 °C, a N-poor, Y- and O-rich oxidised layer was formed, containing crystalline Y2Si2O7. In the TiN-containing samples, Si, Al, Y and Ti were very mobile even at 1000 °C and the surface nitrogen was depleted by 1250 °C. The combined presence of yttrium aluminium garnet (YAG) and TiN protects the β-Sialon phase by forming an oxygen-rich crystalline barrier layer. The oxidation products of TiN in these composites are TiO2 and Y2Ti2O7. The details of the oxidation mechanism of the β-Sialon/TiN composites provided by these IBA studies (movement of yttrium and titanium, replacement of nitrogen by oxygen in the glassy yttrium phase and major crystalline and chemical changes in an outer oxidised layer) could not readily have been obtained by any other techniques, and illustrate the value of IBA for oxidation studies of non-oxide ceramics.
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Pauline Calloch acknowledges the financial support of a PhD Fellowship from the MacDiarmid Institute for Advanced Materials and Nanotechnology.
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Calloch, P., Trompetter, W.J., Brown, I.W.M. et al. Oxidation resistance of β-Sialon/TiN composites: an ion beam analysis (IBA) study. J Mater Sci 53, 15348–15361 (2018). https://doi.org/10.1007/s10853-018-2711-8
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DOI: https://doi.org/10.1007/s10853-018-2711-8