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Journal of Materials Science

, Volume 43, Issue 12, pp 4152–4156 | Cite as

Hot-pressed phosphate glass–ceramic matrix composites containing calcium phosphate particles for nuclear waste encapsulation

  • E. M. Michie
  • R. W. Grimes
  • A. R. BoccacciniEmail author
Rees Rawlings Festschrift

Abstract

Sodium aluminium phosphate (NaAlP) glass–ceramic composites were produced as potential wasteforms for the immobilization of special categories of halide-containing radioactive waste. Sintering conditions for encapsulating a simulated waste (a calcinated mixture of calcium phosphate host and various oxides) in the cold-pressed NaAlP glass–ceramic were first determined and the results were compared with similar samples prepared by hot pressing. In both cases, the conditions aimed to provide a very high-density material, via as low production temperatures as possible, in conjunction with a high waste loading (75 wt.% simulated waste to 25 wt.% glass). It was found that by hot pressing and using a NaAlP glass–ceramic containing 2 mol% B2O3, significantly lower temperatures could be employed compared to the cold pressing and sintering route. The lowest temperature at which a sufficiently dense hot-pressed product was achieved (86% theoretical density), that exhibited mechanical properties similar to those of borosilicate glass (e.g. Young’s modulus 67 ± 2 GPa), was 550 °C. This processing temperature is considerably lower than values reported in the literature for similar systems. As such, hot pressing can be considered as a convenient technique for the fabrication of this type of composite for waste encapsulation.

Keywords

B2O3 Phosphate Glass Glass Powder Waste Form Chemical Durability 

Notes

Acknowledgements

This work was carried out as part of the TSEC programme KNOO and as such we are grateful to the EPSRC for funding under grant EP/C549465/1. We are particularly grateful to Brian Metcalf, Ian Donald and Shirley Fong of AWE Aldermaston (UK) for invaluable discussions and who suggested this study.

References

  1. 1.
    Ojovan MI, Lee WE (2005) An introduction to nuclear waste immobilisation. Elsevier Ltd., Oxford, UKGoogle Scholar
  2. 2.
    Donald IW, Metcalfe BL, Taylor RNJ (1997) J Mater Sci 32(22):5851CrossRefGoogle Scholar
  3. 3.
    Metcalfe BL, Fong SK, Donald IW (2004) In: Oversby VM, Werme LO (eds) Materials research society symposium proceedings, vol 807. Warrendale, PA, pp 255–260Google Scholar
  4. 4.
    Ewing RC (1999) Proc Natl Acad Sci 96(7):3432CrossRefGoogle Scholar
  5. 5.
    Donald IW, Metcalfe BL, Fong SK, Gerrard LA, Strachan DM, Scheele RD (2007) J Nucl Mater 361(1):78CrossRefGoogle Scholar
  6. 6.
    Donald IW (2004) Discovery: Sci Technol J AWE 9:2Google Scholar
  7. 7.
    Metcalfe BL, Donald IW (2004) J Non-Cryst Solids 348:225CrossRefGoogle Scholar
  8. 8.
    Donald IW, Metcalfe BL, Fong SK (2006) J Non-Cryst Solids 352:2993CrossRefGoogle Scholar
  9. 9.
    Raman SV (1998) J Mater Sci 33(7):1887CrossRefGoogle Scholar
  10. 10.
    Pace S et al (2005) J Nucl Mater 341(1):12CrossRefGoogle Scholar
  11. 11.
    Boccaccini AR, Berthier T, Seglem S (2007) Ceram Int 33:1231Google Scholar
  12. 12.
    Saewong P (1998) PhD Thesis, Department of Materials, Imperial College, London, pp 45–47Google Scholar
  13. 13.
    Morton RD (1961) Norsk geologisk tidsskrift 41:223Google Scholar
  14. 14.
    Boccaccini AR, Riaz S, Moisescu C (2001) J Mater Sci Lett 20(19):1803CrossRefGoogle Scholar
  15. 15.
    Lawn BR, Marshall DB (1979) J Am Ceram Soc 62:347CrossRefGoogle Scholar
  16. 16.
    Boccaccini AR (1997) J Mater Process Technol 65:302CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • E. M. Michie
    • 1
  • R. W. Grimes
    • 1
  • A. R. Boccaccini
    • 1
    Email author
  1. 1.Department of MaterialsImperial College LondonLondonUK

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