Synthesis of Hydroxyapatite Based Bioceramic Composite by Hot Isostatic Pressing of Filter Cake

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Three approaches of processing were combined to obtain bioceramic composite with excellent properties. These approaches include ; 1. Synthesis of powder with excellent characteristics by wet chemical process, 2. Filter-cake processing for the preparation of green body with high densification activity, and 3. Application of hot isostatic pressing to achieved high density at low densification temperatures.In the first approach, the processing of powder synthesis was examined. A novel method was proposed to individually control the powder characteristics and chemistry of the powder. In the second approach, the filter cake of the synthesized powder was hot isostatically pressed to examine the densification activity. Highly transparent ceramic was obtained, showing the high densification activity of the filter cake. In the third approach, hot isostatic pressing was successfully applied for the densification of zirconia dispersed hydroxyapatite composite. The composite with high toughness and strength was obtained at 1100^ﾟC, 100MPa, for 2h. The strength and toughness achieved were 190MPa and 2.3MPam^<1/2>, respectively. These values meet the requirement for biomedical application. Other results obtained in this study include ; Controlling of microstructure through the fundamental principle of hot isostatic pressing, and development of neW novel method for detailed characterization of ceramic green body.