Abstract
High-temperature interactions of liquid Ti and Ti74.3Al25.7, Ti49.3Al50.7, Ti26.5Al73.5 and Ti3.5Al96.5 (at.%) alloys with TiB2 ceramic are studied using the sessile drop technique. Molten Ti and Ti–Al alloys show a very good wetting of TiB2. A homogeneous TiB layer with a thickness of about 20 μm forms at the Ti/TiB2 interface. An approximately 200-μm-thick layer of densely packed TiB whiskers is observed at the interface of a Ti74.3Al25.7/TiB2 couple. The Ti49.3Al50.7 liquid penetrates the grain boundaries in the TiB2 ceramic and disconnects the grains in the near-interface region. The Ti26.5Al73.5 melt does not disconnect the TiB2 grains, but penetrates the grain boundaries over a distance of about 300 μm from the interface. Ti3.5Al96.5 just fills the pores in the ceramic up to a distance of about 120 μm from the interface.
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