Abstract
The wettability and reactivity between polycrystalline hot-pressed HfB 2 and liquid Ni, Ni–Ti and Ni–B alloys have been investigated by the sessile drop method up to 1520 °C. Independently of the sintering aids (B 4C, HfSi 2), high-temperature interactions led to the formation of a bimodal interface profile, due to the competition between the strong dissolution of HfB 2 in the liquid phase and drop spreading along the substrate surface. Ni demonstrates good wetting with the HfB 2 substrates ( θ = 20°). Compared to Ni, high Ti-containing alloys reveal much faster wettability kinetics with a final contact angle below 10°, accompanied by the formation of an interfacial Ti-rich reaction product. The eutectic NiB alloy shows complete wetting and fast spreading on HfB 2 and minor dissolution of the ceramic into the liquid, a clear indication that higher B contents could optimize the interfacial structure. These results are of practical interest for liquid-assisted composite synthesis and joining of HfB 2-based ceramics.
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