Cell Structure Control of Porous Titanium Composite Synthesized by Combustion Reaction

Abstract

Porous titanium matrix composites were fabricated by a reaction between titanium powder and boron carbide (B4C) powder. Precursors were made by compacting the elemental powder blend, and heated in an induction furnace to induce the reaction. The reaction was strongly exothermic and, therefore, it was a combustion mode when Ti/B4C blending ratio of the precursor was appropriate. The reaction products were titanium boride (TiB or TiB2) and titanium carbide (TiC). By controlling the Ti/B4C blending ratio, it was possible to control the volume fraction of reaction products in the titanium matrix. The combustion synthesized material was porous and its cell structure was strongly affected by the processing condition of the precursor (porosity of the precursor and Ti/B4C blending ratio). The open cell structure was made from precursors with low Ti/B4C and high porosity. The cell size was varied from several tens of microns to about 500 microns by changing the combustion temperature.

Effect of heat absorbing powder addition on cell morphology of porous titanium composite manufactured by reactive precursor method

“…6 shows XRD data of the specimens with 20.0 vol% TiB 2 addition. The XRD data without TiB 2 addition was reported in the previous paper [16]. The constituent phases of both TiB 2 added and non-added specimens are summarized in Table 1.…”

Self-propagating high-temperature synthesis of advanced materials and coatings

“…TiB 2 -TiC composites have received the most attention due to a good combination of properties such as high hardness, low density, high corrosion resistance, good thermal shock resistance and high-temperature stability. Porous TiB 2 -TiC composites with a broad range of TiB 2 content (20 to 80 mol-%) and pore size ranging from several tens of microns to about 500 μm were fabricated via SHS [285,286]. The effects of SHS parameters on the mechanism of pore formation, microstructure, and final porosity of TiB 2 -TiC composites were widely studied [287,288].…”

Mechanical behavior of porous commercially pure Ti and Ti–TiB composite materials manufactured by selective laser melting

“…As evident, all samples exhibit an interconnected porosity, which is one of the most essential requirements for tissue ingrowth. It is well-known that connective network pattern of pores may help osteogenesis and provide a stable bonding between the human bone and the surgical implant, leading to improve long-term reliability of implant in human body [9,38].…”