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Sintering of the ultrahigh pressure densified hydroxyapatite monolithic xerogels

Published online by Cambridge University Press:  31 January 2011

Ján Majling ,
Peter Znáik ,
Angela Palová ,
Stefan Svetík ,
Stefan Kovalík ,
Dinesh K. Agrawal  and
Rustum Roy
Ján Majling
Affiliation:
Department of Ceramics, Slovak Technical University, 812 37 Bratislava, Slovak Republic
Peter Znáik
Affiliation:
Department of Ceramics, Slovak Technical University, 812 37 Bratislava, Slovak Republic
Angela Palová
Affiliation:
Department of Ceramics, Slovak Technical University, 812 37 Bratislava, Slovak Republic
Stefan Svetík
Affiliation:
Department of Ceramics, Slovak Technical University, 812 37 Bratislava, Slovak Republic
Stefan Kovalík
Affiliation:
Department of Materials Science and Technologies, Slovak Technical University, 812 37 Bratislava, Slovak Republic
Dinesh K. Agrawal
Affiliation:
Intercollege Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802
Rustum Roy
Affiliation:
Intercollege Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802
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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.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 1 , January 1997 , pp. 198 - 202
Copyright
Copyright © Materials Research Society 1997

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