Microstructure and mechanical properties of hydroxyapatite obtained by gel-casting process

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• 作者：Biqin Chen ; Tao Zhang ; Jingxian Zhang ; Qingling Lin ; Dongliang Jiang
• 关键词：A. Suspensions ; C. Mechanical properties ; Microstructure
• 刊名：Ceramics International
• 出版年：2008
• 期刊代码：13_02728842
• 类别：ms
• 出版时间：March 2008
• 卷：34
• 期：2
• 页码：359-364
• 文件大小：1109 K

摘要

In the present work, well-shaped HAp green bodies were obtained by the gel-casting process with 50 vol.%slurry. After drying, the microstructure and pore distribution of the green body were investigated. The density, compressive strength and flexural strength of the green body were 1.621 g/cm³, 32.6 ± 3.2 MPa and 13.8 ± 1.0 MPa, respectively. After pressureless sintering at the range of 1100–1300 °C for 2 h, the relative density of the final product ranges from 71.8 to 97.1%th. The maximum value of flexural strength, elastic modulus, hardness and fracture toughness were 84.6 ± 12.6 MPa, 138 ± 7 GPa, 4.45 ± 0.18 GPa and 0.95 ± 0.13 MPa m^1/2, respectively. SEM images show a compact and uniform microstructure; the average grain size was found by using the linear intercept method. XRD and FTIR determined the phase and the radical preserved after sintering.