Fabrication of Ti-based Biodegradable Material Composites Prepared bySpark Plasma Sintering Method

摘要

This study aims at producing porous Ti filled with biodegradable materials forbiomedical implants by means of spark plasma sintering method (SPS). To improve bone fixationand to obtain appropriate Young's modulus as a medical implant material, we applied β-tri calciumphosphate (β-TCP) to the Ti-based composite. Ti/β-TCP powder mixtures were sintered by SPSunder applied stress of 45MPa with various temperatures and holding time. Vickers hardness (Hv)of obtained composite increased with increasing the holding time up to 10 min, and saturatedhardness was approximately 750 Hv, which is extremely higher than that of bulk Ti. Hardness alsoincreased as sintering temperature increased up to 1473 K. From the results of microstructureobservations by scanning electron microscopy with energy dispersive X-ray spectroscopy(SEM-EDXS), 0- and P- containing Ti surrounded around Ti particle, and O diffused into Tiparticle to a certain extent. X-ray diffraction results indicated several kinds of Ti-O and/or Ti-Pformed in the specimen. Results indicated that it is the brittle phases formed during sintering thatincreased the hardness.