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

将三种制备方法相结合，获得了性能优良的生物陶瓷复合材料。这些方法包括：1。湿化学法合成性能优异的粉体; 2.滤饼处理用于制备具有高致密化活性的绿色坯体，以及3。应用热等静压在低致密化温度下获得高密度。在第一种方法中，研究了粉末合成工艺。提出了一种新的方法来单独控制粉末的粉末特性和化学性质。在第二种方法中，将合成粉末的滤饼热等静压以检查致密化活性。得到了高透明的陶瓷，显示了滤饼的高致密化活性。在第三种方法中，热等静压成功地应用于氧化锆分散羟基磷灰石复合材料的致密化。在1100 ℃、100 MPa、保温2 h的条件下，获得了高韧性、高强度的复合材料。所获得的强度和韧性分别为190 MPa和2.3MPam^<1/2>。这些值满足生物医学应用的要求。在这项研究中获得的其他结果包括：通过热等静压的基本原理控制的微观结构，和新的新方法的详细表征陶瓷绿色体的发展。

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.