Abstract
The objectives of this work were to assess the effects of incorporating Mo2C additions into TiN-Ni3Al cermets, in terms of their densification response and microstructural development. The individual powder components, together with the milled/compacted powder blends were characterised using differential scanning calorimetry and thermogravimetric analysis. Dilatometry was used to determine the densification and sintering response. It is demonstrated that an increase in the Mo2C content reduces both the melting and solidification temperature of the Ni3Al-based component of the system, which is initially formed via reaction sintering. Crystalline phases were identified using X-ray diffraction, which demonstrated that TiN and Mo2C are retained following sintering, and confirmed the formation of Ni3Al. The wettability of the Ni3Al binder was improved through additions of Mo2C, enhancing the densification process. A simple microstructural development model has been outlined, proposing that the Mo2C dissolves during liquid phase sintering, and re-precipitates as a shell on TiN grains either during sintering or solidification, which improves the wetting response between the nitride phase and intermetallic binder.
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