Skip to main content
×
Home
    • Aa
    • Aa

Preparation, characterization, and sinterability of well-defined silica/yttria powders

  • Herbert Giesche (a1) and Egon Matijević (a1)
Abstract

Dispersions of uniform submicron spherical particles consisting of silica cores and yttria coatings, or vice versa, were prepared by a precipitation technique. The overall size of the particles and the thickness of the shells could be varied over a wide range. Such powders were used to form green bodies by sedimentation, centrifugation, or pressure filtration, and the density and the pore size distribution of the resulting solids were evaluated. The green bodies were sintered and the changes in density, phases, and microstructure were followed with temperature. In general, the coated powders exhibited enhanced densification. On processing composite solids at temperatures <1000 °C, the formation of Y2Si2O7 took place, which caused a pronounced shrinkage of the samples. Powders of coated particles having the same silica/yttria ratios sintered at lower temperatures when the shell was composed of silica rather than of yttria. When either silica or yttria were in molar excess in the coated particles, the sintered products had a mixed composition of Y2Si2O7 and the component in excess. By terminating the sintering process before the grain growth started, the solids displayed a well-defined microstructure with a uniform distribution of areas of one phase in the matrix of the matter in excess. This property was mainly due to the uniformity of initial powders in terms of the particle size and the coating.

Copyright
Linked references
Hide All

This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

1 B. Aiken , W. P. Hsu , and E. Matijević , J. Mater. Sci. 25, 1886 (1990).

2 M. Ishitsuka , T. Sato , T. Endo , and M. Shimada , J. Am. Ceram. Soc. 70, C342 (1987).

3 J-G. Duh , H-T. Dai , and B-S. Chiou , J. Am. Ceram. Soc. 71, 813 (1988).

9 N. Hirosaki , A. Okada , and K. Matoba , J. Am. Ceram. Soc. 71, C144 (1988).

10 F. F. Lange , S. C. Singhal , and R. C. Kuznicki , J. Am. Ceram. Soc. 60, 249 (1977).

12 T. R. Dinger , R. S. Rai , and G. Thomas , J. Am. Ceram. Soc. 71, 236 (1988).

15 M. Leskelä and K. Jyrkäs , J. Am. Ceram. Soc. 70, C160 (1987).

16 M. J. Hyatt and D. E. Day , J. Am. Ceram. Soc. 70, C283 (1987).

17 D. R. Ulrich , Chem. Eng. News 68, 28 (1990).

22 E. Matijević , Ann. Rev. Mater. Sci. 15, 483 (1985); Chem. Mater. 5, 412 (1993).

24 R. E. Partch , K. Nakamura , K. J. Wolfe , and E. Matijević , J. Colloid Interf. Sci. 105, 560 (1985).

25 T. Garino , J. Am. Ceram. Soc. 75, 514 (1992).

26 S. Kratohvil and E. Matijević , Adv. Ceram. Mater. 2, 798 (1987).

27 B. Aiken and E. Matijević , J. Colloid Interf. Sci. 126, 645 (1988).

28 A. Garg and E. Matijević , Langmuir 4, 38 (1988).

29 A. Garg and E. Matijević , J. Colloid Interf. Sci. 126, 243 (1988).

30 N. Kawahashi and E. Matijević , J. Colloid Interf. Sci. 138, 534 (1990).

31 D. Kapolnek and L. C. De Jonghe , J. Eur. Ceram. Soc. 7, 345 (1991).

33 G. Passing , R. Riedel , and G. Petzow , J. Am. Ceram. Soc. 74, 642 (1991).

35 M. D. Sacks , N. Bozkurt , and G. W. Scheiffele , J. Am. Ceram. Soc. 74, 2428 (1991).

36 H. Okamura , E. A. Barringer , and H. K. Brown , J. Am. Ceram. Soc. 69, C22 (1986).

37 M. D. Sacks and T-Y. Tseng , J. Am. Ceram. Soc. 67, 526 (1984).

39 M. D. Sacks and S. D. Vora , J. Am. Ceram. Soc. 71, 245 (1988).

41 D. W. Johnson Jr., E. M. Rabinovich , J. B. MacChesney , and E. M. Vogel , J. Am. Ceram. Soc. 66, 688 (1983).

43 B. Aiken , W. P. Hsu , and E. Matijević , J. Am. Ceram. Soc. 71, 845 (1988).

44 Y-S. Her , E. Matijević , and W. R. Wilcox , Powder Technol. 61, 173 (1990).

45 Y-S. Her , E. Matijević , and W. R. Wilcox , J. Mater. Res. 7, 2269 (1992).

46 Y-S. Her , E. Matijević , W. R. Wilcox , O. G. Bailey , and G. Fischman , J. Mater. Sci. Lett. 11, 1629 (1992).

47 D. Sordelet and M. Akinc , J. Colloid Interf. Sci. 122, 47 (1988).

48 D. J. Sordelet and M. Akinc , J. Am. Ceram. Soc. 71, 1148 (1988).

50 M. D. Rasmussen , M. Akinc , and O. Hunter , Jr., Ceram. Int. 11, 51 (1985).

52 M. Ciftcioglu , M. Akinc , and L. Burkhart , J. Am. Ceram. Soc. 70, C329 (1987).

53 M. Ciftcioglu , D. M. Smith , and S. B. Ross , Powder Technol. 55, 193 (1988).

54 W. Stöber , A. Fink , and E. Bohn , J. Colloid Interf. Sci. 26, 62 (1968).

57 A. R. Spurr , J. Ultrastructure Res. 26, 31 (1969).

58 E. W. Washburn , in Proc. Natl. Acad. Sci., USA 7, 115 (1921).

59 A. K. van Helden and A. Vrij , J. Colloid Interf. Sci. 76, 418 (1980).

60 A. K. van Helden , J. W. Jansen , and A. Vrij , J. Colloid Interf. Sci. 81, 354 (1981).

Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Journal of Materials Research
  • ISSN: 0884-2914
  • EISSN: 2044-5326
  • URL: /core/journals/journal-of-materials-research
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 13 *
Loading metrics...

Abstract views

Total abstract views: 48 *
Loading metrics...

* Views captured on Cambridge Core between September 2016 - 25th May 2017. This data will be updated every 24 hours.