Cell Structure Control of Porous Titanium Composite Synthesized by Combustion Reaction

摘要

Porous titanium matrix composites were fabricated by a reaction between titanium powder and boron carbide powder (B4C). Precursors were made by compacting the starting 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/B_4C blending ratio of the starting powder was appropriate. The reaction product was both titanium boride (TiB or TiB_2) and titanium carbide (TiC). By controlling the Ti/B_4C blending ratio, it was possible to control the volume fraction of reaction products in titanium matrix. The combustion synthesized material was porous and its porous structure was strongly affected by the processing condition of the precursor (porosity of the precursor and 'Ti/B_4C blending ratio). The cell-edge size was varied from several tens of microns to about 500 microns by changing the combustion temperature.