A novel low-temperature chemical vapor-plating process has been investigated for obtaining pyrolytic titanium diboride reinforcing agents. Both fibers and ribbons were prepared by the thermal decomposition of titanium borohydride vapors upon various substrates, such as fine tungsten wires and graphite yarns. On a theoretical basis, the resulting titanium diboride structures are prime candidate reinforcing agents for ablative composites because of their high-temperature mechanical properties, extreme resistance to oxidation, flexibility, and thermal stability. These newly developed reinforcing agents are intended for use in ablative and high-temperature plastic composites. 107