Fracture Behaviour of Pressureless Sintered Nickel-Reinforced Alumina Composites
Nickel-reinforced alumina composites have been manufactured by aqueous slip casting and pressureless sintered under flowing atmosphere of argon with 0,36 and 1% of oxygen in order to force interfacial reactions leading to the formation of a nickel-aluminum spinel. Colloidal stability of concentrated suspensions of alumina with 5, 10 and 15 vol% of nickel has been studied in terms of zeta potential, rheometry and packing density. The processed composites show a high dispersion of the nickel into the alumina matrix and green densities of 60-70 %th. The effect of sintering temperature and atmosphere on the mechanical behaviour of the composites has been investigated through Vickers indentation and fractographic SEM observations.
J. Dusza, R. Danzer and R. Morrell
A. Beverina et al., "Fracture Behaviour of Pressureless Sintered Nickel-Reinforced Alumina Composites", Key Engineering Materials, Vol. 290, pp. 324-327, 2005