Effect of Milling Time on the Microstructure of Ti35Nb2. 5Sn5HA Biocomposite Fabricated by Powder Metallurgy

摘要

A novel Ti-35Nb-2. 5Sn/5Hydroxyapitite(HA) biocompatible composite was fabricated by pulsed current activated sintering (PCAS) at 1100 °C under 60 MPa. The raw powders were high energy mechanical milled (HEMM) for 0 h,4 h,8 h and 12 h. The effect of milling time on the mor-phologies of Ti35Nb2. 5Sn/5HA powders and microstructures of composite were studied. Results indicated that ball milling for 8 h led to a phase starting to transform into β phase and after milled for 12 h the powders contained only β phase. After milled for 12 h, the particle size of the powders was about 200 nm and the grain size of sintered composite was about 50nm. As the increase of ball milling time both hardnesses and relative densities of the sintered composites were increased.