Processing of ceramic-metal composites (CERMETS) Al{sub 2}O{sub 3}-TiC{sub x}N{sub 1-x}-Mo{sub 2}C-Ni
- Swiss Federal Institute of Technology, Lausanne (Switzerland)
The development of cermets (ceramic-metal composites) where the metal acts as a binder, has been aimed mainly at the improvement of properties at high temperatures. These materials find applications as cutting tools, wear parts and in energy transformation where high wear resistance, toughness and good heat and oxidation resistance are needed. The incorporation of other ceramic particles in the form of fibres, platelets, or powders, into these cermets is one way to improve their properties and extend their area of application. The incorporation of oxides into cermets, such as Al{sub 2}O{sub 3} should improve the cermet properties at high temperatures. One of the main difficulties encountered in incorporating for example short fibers into ceramic matrix composites has been the adequate dispersion of the reinforcing particle within the composite when using traditional mixing/milling and dry pressing routes. The poor dispersion of the fibres leads to difficulties in the densification of the composites. Wet processing techniques such as slip casting and filter pressing have been more successful. Slip casting experiments carried out using TiC{sub x}N{sub 1-x}-MO{sub 2}C-Ni cermets showed promise but when alumina was added to the already complex mixture the control and handling of the slurries proved too difficult to make the approach practicable. In the present study work has been carried out using pressure filtration for alumina containing cermets of composition - Al{sub 2}O{sub 3}-TiC{sub x}N{sub 1-x}-Mo{sub 2}C-Ni, with the alumina particles in either powder or platelet form. Prohibitively long filtration times were encountered for the cermets when the alumina was used in the powder form; the use of a flocculation step before drying mixtures for consequent dry pressing has been investigated.
- OSTI ID:
- 99182
- Report Number(s):
- CONF-940911-; TRN: 95:005310-0072
- Resource Relation:
- Conference: 5. international conference on ceramic processing science and technology, Friedrichshafen (Germany), 11-14 Sep 1994; Other Information: PBD: 1995; Related Information: Is Part Of Ceramic transactions: Ceramic processing science and technology. Volume 51; Hausner, H.; Messing, G.L.; Hirano, Shin-ichi [eds.]; PB: 835 p.
- Country of Publication:
- United States
- Language:
- English
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