Mechanical Properties of Porous Materials Made from Helically Wrapped Titanium Fibers Fabricated by Compression Rotation Shearing Method at Room Temperature

The purpose of this study was to form a porous material made of titanium fibers that has an elastic modulus similar to that of biological bone and a uniform internal structure. Titanium fibers were wound in a spiral shape at regular intervals, placed in a cylindrical container, and then compressed at various compression stresses while applying shear stress due to rotation to create a compact material. Furthermore, compression tests, porosity measurements, pore size measurements, and bonding rate measurements were performed on the samples produced to clarify the effect of molding stress on the mechanical properties of the porous material made of titanium fibers. The internal structure was also compared with that of a molded body produced by randomly filling it with fibers, and the uniformity of porosity was evaluated. As a result, the compressive modulus of the compacts produced by spiral winding was higher than that of the compacts produced by random filling. The compressive modulus increased with forming stress and was equal to that of living bone at all forming stresses. The porosity was found to be uniform, with pore sizes distributed in the range of 10-20%. Furthermore, the pore size distribution showed two peaks at 12-16 μm and 24-28 μm.