Titanium-Hydroxyapatite Sintered Composites Processing and Characterization

摘要

In this work, we have studied the effect of sintering parameters of a 80/20% titanium/hydroxyapatite composite processed by a powder metallurgy route (P/M) for surgical implant purposes. This knowledge is important for biomaterials systems developments because it's necessary to create an interaction between titanium and hydroxyapatite (HAP) particles with desirable phase formations at the Ti/HAP interface. Quantitative EDS and XRD, using Rietveld Method, were performed where the presence of several phases were determined. EDS images revealed the P diffusion to Ti particles with the possible formation of Ti_3P phase at the Ti/HAP interface. Rietveld semi-quantitative calculations revealed the possible presence of 9 different phases in the sintered sample: pure Ti, Ti_2O, HAP, TTCP, brushite, perovskite and a sequence of phosphides (Ti_3P, Ti_5P_3 and Ti_2P). The results have shown that the P/M route used must be optimized to eliminate the presence of phosphides phases inside Ti particles.