放電プラズマ焼結法によるHAp/β-TCP系傾斜機能材料の力学的特性および生体適合性

概要

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Recently, spark plasma sintering (SPS) known as a novel sintering technology has been used for fabricating ceramics, functionally graded materials (FGM) and composites. SPS can consolidate powders at lower sintering temperature and for shorter sintering duration compared to conventional sintering methods, such as hot-pressing or HIP (Hot Isostatic Pressing). Mechanical properties (three-point bending strength, Young's modulus and compressive strength) and biocompatibility of HAp/β-TCP FGM sintered by SPS were investigated. The FGMs were sintered at a temperature of 1073K and at a pressure of 44.6 or 66.9MPa. The FGMs compacts had higher three-point bending strength, Young's modulus and compressive strength than β-TCP. Natural bone formed on the surface of the FGM in the HAp-rich area and replacement for bone in the β-TCP-rich area. These results show that the HAp/β-TCP FGM sintered by SPS had high strength, excellent biocompatibility and controllability for graded bio-reaction.
2009-05-25