Near-Net-Shape Thermoplastic Forming of Alumina-Silicon Carbide Nanocomposites
Alumina-SiC nanocomposites have attracted the interest of material scientists due to their excellent mechanical and thermomechanical properties. Compared to alumina they offer higher strength, toughness and reliability. The high creep resistence of alumina-SiC makes it attractive for high temperature structural applications. Commercial applications however require performing and reliable manufacturing technologies. Ceramic injection molding (CIM) was chosen for the production of small and complex shaped components with narrow dimensional tolerances used in engineering applications. For axially symmetric, elongated component geometries such as tubes or rods, thermoplastic extrusion is a more appropriate forming technology. In this study the complete process cycle of thermoplastic extrusion and injection molding was evaluated with the aim to evaluate their suitability for industrial production of alumina-SiC nanocomposites. Compounding of the feedstocks, forming by CIM and extrusion and the subsequent thermal treatment – debinding and pressureless sintering were investigated. Intermediate and final products were characterized with respect microstructure and mechanical.
Pietro VINCENZINI, Sheldon WIEDERHORN and Paolo COLOMBO
F. Kern and R. Gadow, "Near-Net-Shape Thermoplastic Forming of Alumina-Silicon Carbide Nanocomposites", Advances in Science and Technology, Vol. 65, pp. 1-10, 2010