Abstract
Ni–NiO composites have been obtained by the thermally induced oxidation of metallic green compacts at temperatures between 300 and 450°C and further sintering. Thermogravimetric studies showed that oxidation process in air follows a quadratic dependence with time for temperatures between 300 and 400°C allowing the control in the metal to oxide ratio. Microstructural analyses of compacts sintered in inert atmosphere reveal a homogeneous distribution of phases. In the mechanical tests the metal to ceramic ratio variation is evident in the ductile to brittle transition of the fracture, making this method suitable to fabricate compacts with tailored mechanical properties.
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