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Title: The hot pressing of beryllium oxide with additives.
Authors: Bardsley, J
Wulf, G
Keywords: Carbon
Hot pressing
Beryllium oxides
Grain size
Issue Date: Feb-1968
Publisher: Australian Atomic Energy Commission
Citation: Wulf, G., Bardsley, J. (1968). The hot pressing of beo with additives (AAEC/TM440). Lucas Heights, N.S.W.: Research Establishment, Australian Atomic Energy Commission.
Abstract: The effect of variations in temperature, pressure and pressure cycle on the density vs grain size relationship was determined for hot pressed, sulphate-derived UOX beryllium oxide; the effects of selected additives on the final grain size using constant hot pressing conditions were also determined. A single-ended pressing technique, incorporating an incremental build-up in the pressing pressure, was developed to produce hot pressed specimens of near theoretical density with a uniform grain size of 25u. Smaller grain sizes were not obtained by this technique owing to the onset of discontinuous grain growth at a bulk density of 97 per cent theoretical. However, by introducing a 'dwell' or 'equilibration' time at temperature before the application of the load, a theoretically dense specimen (3.010 g/cm3) was produced with a uniform 8u grain size. Carbon was the only additive which consistently refined the grain size at all levels of addition. A hot pressed specimen of 99 per cent theoretical density and 2u grain size was obtained using a standard condition of 1500°C, 250 kg/cm2 for 25 minutes, 5 volume per cent of colloidal graphite additive.
Gov't Doc #: 355
Appears in Collections:Scientific and Technical Reports

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