ANSTO Publications Online: Hot pressing of beryllium oxide with additives.

Please use this identifier to cite or link to this item: http://apo.ansto.gov.au/dspace/handle/10238/235

Title:	Hot pressing of beryllium oxide with additives.
Authors:	Bardsley, J Wulf, G
Issue Date:	Feb-1968
Publisher:	Australian Nuclear Science and Technology Organisation
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.
URI:	http://apo.ansto.gov.au/dspace/handle/10238/235
Appears in Collections:	Scientific and Technical Reports

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