Preparation and Characterization of Fe Doped Ti-Si Porous Membrane Materials

A composite porous material with porous titanium as the matrix and Fe doped Ti-Si intermetallic compound as the porous membrane layer was prepared using Fe powder,Ti powder and Si powder as raw materials,combined with molding and vacuum sintering processes.The effects of Fe doping on the microstructure,phase composition and pore properties of the porous membranes were systematically investigated by SEM,XRD,XPS and pore size analyzer.The results show that,in addition to the main phase Ti₅Si₃,a small amounts of new phases TiFeSi and TiFeSi₂ are also generated in the prepared Fe-doped Ti-Si porous membrane;meanwhile,the content of Ti₅Si₃ on the surface of the porous membrane gradually decreases with the increase of Fe doping amount,while the content of new phases TiFeSi and TiFeSi₂ gradually increases.Finally,with the increase of Fe doping,the size of Ti₅Si₃ particles generated in the porous membrane becomes larger and the denseness of the membrane increases gradually,leading to the decrease of the relative air permeability coefficient and the maximum bubbling pore size of the prepared material.