a1 Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Cientificas (CSIC), Cantoblanco, 28049 Madrid, Spain
a2 Shonan Institute of Technology, Tsujido-Nishikaigan, Fujisawa, Kanagawa 251, Japan
Dense 3-mol%-yttria-stabilized tetragonal zirconia polycrystals (3Y-TZP/Ni) homogeneous composites were prepared by a wet-processing route with metal concentration ranging from 0 to 40 vol%. Cyclic fatigue stress/life, tensile and bending strength, and fracture toughness were investigated in 3Y-TZP monolithic samples and 3Y-TZP/Ni composites. It was found that the addition of Ni particles to the 3Y-TZP matrix produced an embrittlement effect in the composites, decreasing the mechanical properties. This fact was attributed to the weak bonding between the Ni and 3Y-TZP particles in samples sintered in a reductive atmosphere. Additionally, the presence of Ni particles decreases the cyclic tensile fatigue of the composites probably by an environmentally assisted slow crack growth.
(Received April 26 2001)
(Accepted March 22 2002)
c1 Address all correspondence to this author.