Preparation, microstructure and mechanical properties of porous titanium sintered by Ti fibres

Abstract

Open-cell porous Ti with a porosity ranging from 35 to 84% was successfully manufactured by sintering titanium fibres. The microstructure of the porous titanium was observed by SEM and the compressive mechanical properties were tested. By adjusting the spiral structure of the porous titanium, the pore size can be controlled in a range of 150-600 microm. With the increasing of the porosity, compressive yield strength and modulus decrease as predicated. However, high mechanical properties were still obtained at a medium porosity, e.g. the compressive yield strength and the modulus are as high as 100-200 MPa and 3.5-4.2 GPa, respectively, when the porosity is in the range of 50-70%. It was suggested that the porous titanium be strong enough to resist handing during implantation and in vivo loading. It is expected to be used as biocompatible implant, because their interconnected porous structures permit bone tissues ingrowth and the body fluids transportation.

Bulk and porous metastable beta Ti–Nb–Zr(Ta) alloys for biomedical applications

“…The plastic and elastic collapse models for compressive stresses of foams can be combined using the rule of mixture to calculate the plateau stress of the foam [40]:…”

“…It also depends on the pores' size, shape and distribution, including detailed pore morphology, such as micro-pores forming at the edges [42].A s underlined in Ref. [40], pore shapes and sizes play a critical role in determining the compression behaviors of foams. In Ref.…”

Guided Bone Regeneration using Hydroxyapatite-Coated Titanium Fiber Web in Rabbit Mandible: Use of Molecular Precursor Method

“…Zou et al reported that the compressive yield strengths of sheaved titanium fiber sheets with a porosity of 53, 67, and 72% were approximately 200, 100, and 60 MPa, respectively 26) . Conversely, the compressive strengths of commercially available bone ceramics with a porosity of 0.93 and 53% were 33.9 and 0.24 MPa, respectively 27) .…”

Physical and Biological Characterization of Ferromagnetic Fiber Networks: Effect of Fibrin Deposition on Short-Term In Vitro Responses of Human Osteoblasts

“…Depending on the fiber volume fraction, the network architecture (isotropic or highly oriented), and the fiber segment aspect ratio, experimentally measured Young's moduli values are no higher than a few GPa. [15][16][17][18][19] The elastic properties of highly porous materials are most commonly measured using conventional mechanical (static) testing with the majority of studies focusing on compressive testing as it is easier to carry out compared with tensile testing or even bending. However, it is well known that in highly porous materials inelastic straining commonly occurs at low applied loads.…”