The Interface Characterization of Laminar Nickel-Alumina Composites
The objective of the present work is to examine the different aspects of the interfaces existing in three and five layers laminar composites. A12O3, Ni and Ni + A12O3 (microinfiltrated bonding layer; Ni:Al2O3-25:75 wt% mixture) layers were obtained by tape casting. The characterization of laminated A12O3 / Ni+ A12O3 / and A12O3/ Ni+ A12O3 / Ni / Ni+ A12O3 / A12O3 composites produced by pressureless sintering, included SEM, ED AX, Rö and bending tests examinations. The nature of interface between the individual layers of the composites, as well as nickel particles in alumina matrix (microinfiltrated laminae), has been discussed. Bonding quality, interaction between cracks and nickel particles, laminar composite architecture and thermal residual stresses as well influence the strength of the composites.
KeywordsSpinel Phase Nickel Particle Bonding Layer Pressureless Sinter Spinel Formation
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