The formation of disordered intermetallic phase during the solid-state interaction of WC with Ir
A relatively simple approach based on mixing WC and iridium powders, followed by heating to 1300–1600 °C in inert atmosphere, was proposed to synthesize refractory intermetallics in the tungsten – iridium system. The peculiarities of the solid-state interaction in the WC-Ir system were studied withi...
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Veröffentlicht in: | Journal of alloys and compounds 2019-02, Vol.775, p.503-510 |
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Hauptverfasser: | , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | A relatively simple approach based on mixing WC and iridium powders, followed by heating to 1300–1600 °C in inert atmosphere, was proposed to synthesize refractory intermetallics in the tungsten – iridium system. The peculiarities of the solid-state interaction in the WC-Ir system were studied within the 1000–1600 °C temperature range using a set of modern analytical techniques. Intensive solid-state interaction in the WC – Ir system starts at 1300 °C. It was stated that this interaction can be described by two stages in the 1300–1600 °C temperature range. The first stage is the formation of Ir-rich disordered WxIr1-x solid solution with constant average composition W0.265Ir0.735. The second stage is the interaction of the obtained WxIr1-x solid solution with residual component (Ir or WC) that leads to the shift of the WxIr1-x phase composition on one side or the other in dependence on type of residual component. No ordered intermetallic phases are formed in the 1300–1600 °C temperature range. In the course of the solid-state reaction, free carbon is released as graphite-like phase on the surface of the intermetallic product.
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•Intensive interaction of Ir with WC starts at relatively low temperature (1300 °C).•Products of interaction are WxIr1-x solid solution and free carbon.•The steady-state W0.265Ir0.735 phase is formed at the first stage of interaction.•At the second stage, the WxIr1-x composition shifts to homogeneity boundaries. |
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ISSN: | 0925-8388 1873-4669 |
DOI: | 10.1016/j.jallcom.2018.10.118 |