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Sintering of the ultrahigh pressure densified hydroxyapatite monolithic xerogels

  • Ján Majling (a1), Peter Znáik (a1), Angela Palová (a1), Stefan Svetík (a1), Stefan Kovalík (a2), Dinesh K. Agrawal (a3) and Rustum Roy (a3)...

Abstract

Dense and translucent ceramics were prepared by sintering of cylindrical preforms of hydroxyapatite extruded from xerogels. Extruded specimens were dried as monoliths and then consolidated by applying cold isostatic pressure, ranging from 500 to 1500 MPa. Upon heating the samples began to densify at 610 °C, and the densification/sintering was completed at 870 °C as was evidenced by the dilatometry plot indicating no further shrinkage. The sintered specimens thus formed were translucent in appearance. Further heating of the samples up to 1200 °C resulted in their “bloating” or creation of pores in the originally dense matrix. Pore creation within the structure is reproducible, it proceeds from the surface to the interior of the sample, and its spreading can be thermally controlled. Pore evolution within the single phase dense polycrystalline material is not related to the frequently occurring phenomenon of microcracking in ceramics during cooling.

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1.Jarcho, M., Bolen, C., Thomas, M., Bobick, J., Kay, J., and Doremus, R., J. Mater. Sci. 11, 2027 (1976).
2.Osaka, A., Miura, Y., Takeuchi, K., and Takahashi, K., J. Mater. Sci.: Materials in Medicine 2, 51 (1991).
3.Ababou, A., Bernache-Assollant, D., and Heughebaert, M., Ceram. Processing Sci. Technol., p. 111.
4. Kazuo Kondo, Masahiko Okuyama, Hidetoshi Ogawa, and Yoshimasa Shibata, J. Am. Ceram. Soc., C-222 (1984).
5. Huaxia Ji and Marquis, P., J. Mater. Sci. Lett. 10, 132 (1991).
6.Akimov, G. J., Timtschenko, V. M., and Arseneev, P. A., Ogneupory. Nos. 1–5, 19 (1994).
7.Nordstrom, E. G. and Karlsson, K. H., J. Mater. Sci.: Materials in Medicine 1, 182 (1990).
8.Wang, P. E. and Chaki, T. K., J. Mater. Sci.: Materials in Medicine 4, 150 (1993).
9.Ioku, K., Soymia, S., and Yoshimura, M., J. Mater. Sci. Lett. 8, 1203 (1989).
10.Takagi, M., Mochida, M., Uchida, N., Saito, K., and Uematsu, K., J. Mater. Sci.: Materials in Medicine 3, 199 (1992).
11.Agrawal, D. K., Fang, Y., Roy, D. M., and Roy, R., in Microwave Processing of Materials III, edited by Beatty, R. L., Sutton, W. H., and Oskander, M. F. (Mater. Res. Soc. Symp. Proc. 269, Pittsburgh, PA, 1992).
12.Bakó, Z. and Kotsis, I., Ceramics Int. 18, 373 (1992).
13.De With, G., Van Dijk, H. J. A., Hattu, N., and Prijs, K., J. Mater. Sci. 16, 1592 (1981).
14.Yamashita, K., Owada, H., Nakagawa, H., Umegaki, T., and Kanazawa, T., J. Am. Ceram. Soc. 69, 690 (1986).
15.Nakamura, Satoshi, Otsuka, Ryohei, Aoki, Hideki, Akao, Masaru, Miura, Naoki, and Yamamoto, Takeyuki, Thermochim. Acta 165, 57 (1990).
16.Itatani, Kiyoshi, Nishioka, Toshio, Seike, Satoru, Howell, F. S., Kishioka, Akira, and Kinoshita, Makio, J. Am. Ceram. Soc. 77, 801 (1994).
17.Fujiu, T. and Messing, G. L., J. Mater. Synth. Process. 1, 33 (1993).
18.Bridgwater, J., Mater. Design 14, 1518 (1993).
19.Kim, D-J. and Hrma, P., J. Am. Ceram. Soc. 75, 2959 (1992).
20.Zhong, J. P., Fathi, Z., Latorre, G. P., Folz, D. C., and Clark, D. E., Ceram. Eng. Sci. Proc. 15, 1003 (1994).
21.Woignier, T., Phalippou, J., and Prassas, M., J. Mater. Sci. 25, 3118 (1990).
22.Wakai, F., Kodama, Y., and Sakaguchi, S., J. Am. Ceram. Soc. 73, 457 (1990).
23.Yamashita, K., Kitagaki, K., and Umegaki, T., J. Am. Ceram. Soc. 78, 1191 (1995).

Sintering of the ultrahigh pressure densified hydroxyapatite monolithic xerogels

  • Ján Majling (a1), Peter Znáik (a1), Angela Palová (a1), Stefan Svetík (a1), Stefan Kovalík (a2), Dinesh K. Agrawal (a3) and Rustum Roy (a3)...

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