Advanced Powdermetallurgical Technologies to Manufacture Metal Matrix Composites

摘要

Powder Metallurgy offers the possibility to combine a large variety of materials. That’srnwhy new properties and combination of properties can be achieved and materials which cannotrnbe prepared my melting technology can be obtained. In addition to conventional pressure lessrnsintering several pressure-assisted techniques were developed in the past to manufacturerncomposites having new compositions or improved properties due to unique microstructures.rnThe paper will f℃us on metal-carbon composites with interesting thermo-physical andrnmechanical properties. The carbon source can be graphite, diamond or carbon nanofibers. Fastrnsintering technologies like spark plasma sintering can be used to avoid undesired reactionsrnbetween the constituents or to tailor the reaction between the constituents to obtain newrnmicrostructures and properties. In case of carbon nanofibers subsequent forming operation (hotrnextrusion) can lead to 1D orientation of fibres and consequently to anisotropic properties. Forrngraphite a 2 D orientation and for diamond particles a 3d orientation can be expected,rnconsequently properties will depend from the orientation.