The hot pressing of beryllium oxide with additives.

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dc.contributor.authorBardsley, Jen_AU
dc.contributor.authorWulf, Gen_AU
dc.date.accessioned2007-11-22T04:15:21Zen_AU
dc.date.accessioned2010-04-30T04:32:45Zen_AU
dc.date.available2007-11-22T04:15:21Zen_AU
dc.date.available2010-04-30T04:32:45Zen_AU
dc.date.issued1968-02en_AU
dc.description.abstractThe 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.en_AU
dc.identifier.citationWulf, G., Bardsley, J. (1968). The hot pressing of beo with additives (AAEC/TM440). Lucas Heights, N.S.W.: Research Establishment, Australian Atomic Energy Commission.en_AU
dc.identifier.govdoc355en_AU
dc.identifier.otherAAEC-TM-440en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/235en_AU
dc.language.isoen_auen_AU
dc.publisherAustralian Atomic Energy Commissionen_AU
dc.subjectCarbonen_AU
dc.subjectHot pressingen_AU
dc.subjectBeryllium oxidesen_AU
dc.subjectAdditivesen_AU
dc.subjectGrain sizeen_AU
dc.titleThe hot pressing of beryllium oxide with additives.en_AU
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