Abstract
Polybenzimidazole (PBI) was synthesized and characterized by means of Fourier transformation infrared (FUR) spectrometer, nuclear magnetic resonance (1H-NMR) spectroscopy, elemental analysis, and gel permeation chromatography (GPC). The resulting PBI product was used as the polymer matrix to prepare composites reinforced with titanium (abridged as PBI/Ti) using hot-press sintering in vacuum. A scanning electron microscope (SEM) was used to observe the morphology of the composite samples, while a Rockwell hardness tester and a pin-on-disk friction and wear tester were performed to evaluate the mechanical and tribological properties of the bulk PBI composites. It was found that the PBI composites had a relatively low density of 1.3–1.7 g/cm3 and high Rockwell hardness of 60 I IRA. The introduction of Ti as the reinforcing agent contributed to improving the mechanical properties of the PBI composites, with the maximum compressive strength to be as high as 2980.58 MPa. Moreover, the PBI/Ti composites had small friction coefficients as slid against AISI-1045 steel in a ball-on-disk configuration, and the friction coefficients decreased with increasing temperature. The wear resistance of PBI. however, was reduced slightly by the incorporation of the Ti powders, and increased wear rates were recorded for the PBI/Ti composites at elevated temperatures.
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