TY - JOUR

T1 - Porous titanium manufactured by a novel powder tapping method using spherical salt bead space holders: characterisation and mechanical properties

AU - Jia, Jiangang

AU - Siddiq, Abdur R.

AU - Kennedy, Andrew R.

N1 - This is the author’s version of a work that was accepted for publication in Journal of Mechanical Behavior of Biomedical Materials. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Mechanical Behavior of Biomedical Materials, 48, 2015 Doi: 10.1016/j.jmbbm.2015.04.018

PY - 2015/8

Y1 - 2015/8

N2 - Porous Ti with open porosity in the range of 70textendash80% has been made using Ti powder and a particulate leaching technique using porous, spherical, NaCl beads. By incorporating the Ti powder into a pre-existing network of salt beads, by tapping followed by compaction, salt dissolution and textquotedblleftsinteringtextquotedblright, porous structures with uniform density, pore and strut sizes and a predictable level of connectivity have been produced, showing a significant improvement on the structures made by conventional powder mixing processes. Parts made using beads with sizes in the range of 0.5-1.0 mm show excellent promise as porous metals for medical devices, showing structures and porosities similar to those of commercial porous metals used in this sector, with inter-pore connections that are similar to trabecular bone. The elastic modulus (0.86GPa) is lower than those for commercial porous metals and more closely matches that of trabecular bone and good compressive yield strength is retained (21MPa). The ability to further tailor the structure, in terms of the density and the size of the pores and interconnections has also been demonstrated by immersion of the porous components in acid.

AB - Porous Ti with open porosity in the range of 70textendash80% has been made using Ti powder and a particulate leaching technique using porous, spherical, NaCl beads. By incorporating the Ti powder into a pre-existing network of salt beads, by tapping followed by compaction, salt dissolution and textquotedblleftsinteringtextquotedblright, porous structures with uniform density, pore and strut sizes and a predictable level of connectivity have been produced, showing a significant improvement on the structures made by conventional powder mixing processes. Parts made using beads with sizes in the range of 0.5-1.0 mm show excellent promise as porous metals for medical devices, showing structures and porosities similar to those of commercial porous metals used in this sector, with inter-pore connections that are similar to trabecular bone. The elastic modulus (0.86GPa) is lower than those for commercial porous metals and more closely matches that of trabecular bone and good compressive yield strength is retained (21MPa). The ability to further tailor the structure, in terms of the density and the size of the pores and interconnections has also been demonstrated by immersion of the porous components in acid.

KW - Porous metal

KW - Titanium

KW - Powder metallurgy

U2 - 10.1016/j.jmbbm.2015.04.018

DO - 10.1016/j.jmbbm.2015.04.018

M3 - Journal article

VL - 48

SP - 229

EP - 240

JO - Journal of the Mechanical Behavior of Biomedical Materials

JF - Journal of the Mechanical Behavior of Biomedical Materials

SN - 1751-6161

ER -