Fabrication of Yttria Stabilized Tetragonal Zirconia Polycrystals Containing TiNi Intermetallic Compounds
3Y-TZP/TiNiCo composites have been successfully fabricated by three step heating (dehydrogenation, hydrogen reduction, hot-pressing) of 3Y-TZP /NiO/TiH2/CoO powder mixtures. XRD analysis revealed that TiNi-base intermetallic compounds such as Ni4Ti3, NiTi, Ni3Ti had formed. The bending strength of 3Y-TZP/TiNiCo composites (~650 MPa) were much higher than those of 3Y-TZP monolith (350 MPa) sintered at the same condition. The electrical resistivity characteristics indicated that 3Y-TZP/30 vol%TiNiCo composites were good electrical conductors. Cobalt addition to TiNi phase influenced on electrical properties of final composites, while their fracture strength was unchanged by the Co addition.
T. Ohji, T. Sekino and K. Niihara
N. Tanaka et al., "Fabrication of Yttria Stabilized Tetragonal Zirconia Polycrystals Containing TiNi Intermetallic Compounds", Key Engineering Materials, Vols. 317-318, pp. 673-676, 2006