Abstract
Nanostructured nickel matrix composites reinforced with nanosized, undoped, tetragonalzirconia has been synthesized by cathodic pulsed electrodeposition. The reinforcement issynthesized by the aqueous combustion synthesis route with glycine as the fuel and zirconylnitrate as the oxidizer. The reinforcement and composite have been characterized by XRD,TEM and SEM coupled with EDS. The microhardness and thermal stability(Kissinger method) of the composite are evaluated. These values are comparedwith those of pure nickel deposited under the same conditions. The results showthat the microhardness of the nickel matrix is enhanced by the presence of thereinforcement from 450 to 575 VHN. Also the strengthening due to grain sizeeffects and dispersion strengthening effect are evaluated individually and theinterparticle separation is estimated to be around 85 nm. The volume fraction of thereinforcement is estimated to be 12–15% and the particles are uniformly distributed andmonodispersed in the nickel matrix. The thermal stability of the composite isbetter than that of pure nickel in contrast to some of the reported literature.
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