The role of metal–ceramic interfaces on the high temperature mechanical response of nanostructured nickel–yttria tetragonal zirconia polycrystals (Ni–YTZP)

Anomalous high activation energy for creep in nanostructured 3YTZP/Ni cermets

“…The zirconium diffusion along those Ni-O boundaries could be responsible of the accommodation mechanism for creep in these nano-Ni composites resulting in higher values of Q as reported. 14 In the light of this model, the Q-tendency observed in this study could be related to the proportion of well-matched metalceramic interfaces in the different nanocomposites better than to the nickel content itself. This proportion depends on the volume content and size of both 3YTZP and Ni phases.…”

“…14 The presence of these rich Ni-O bonding interfaces is likely to affect the activation energies for creep because of the influence on the path of the Zr diffusion that controls the accommodation mechanism in 3YTZP GBS. The model presented in Ref.…”

A general law for liquid metal-onto-ceramic wetting: An electrostatic approach

“…13 However, wetting takes place if an ionised form of nickel is deposited onto the same surface. 13 Such phenomenon can be explained quite easily: it is a reported fact that yttrium segregation takes place in many YTZP ceramic systems, producing an yttrium concentration in excess of the nominal one. 14 In consequence, a net surface charge exists on YTZP, leading an electric field emerging from the surface.…”