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Abstract
Since the hot pressing of ZrB2 compacts has a number of limitations, the possibility of pressureless sintering by the addition of small amounts of various metals to provide a liquid phase has been investigated. Changes in microstructure and porosity of the compacts have been studied. Additions of up t0 3% of iron, nickel, cobalt, or high-melting-point metals enable satisfactory sintering at 2000°C in argon or in vacuum to be achieved in < 60 min. The effect is associated with an appreciable contraction of the ZrB2 lattice.
Notes
* Manuscript received 30 July 1964. Contribution to a Symposium on “Recent Advances in Powder Metallurgy”, held in London on 22 and 23 October 1964.