Microstructural development and mechanical properties of pressureless sintered Al{sub 2}O{sub 3}/SiC composites
- Institut fuer Neue Materialien gem. GmbH, Saarbruecken (Germany)
Al{sub 2}O{sub 3} green bodies containing 5 vol.% SiC were prepared by slip casting. In order to obtain stable slips, the zeta potential of the SiC was adapted by chemical modification of the surface using functional silanes (e.g. amino ethyl amino propyl trimethoxy silane). Another route for the preparation of homogeneous slips was developed by heterocoagulation of Al{sub 2}O{sub 3} and SiC under well controlled pH conditions and by stabilizing of the heterocoagulated system with a non-ionic Surfactant. Both routes led to homogeneous aqueous slips which could be slip-casted to green compacts with densities around 60 % of theory showing an excellent distribution of the SiC within the Al{sub 2}O{sub 3} matrix. Green compacts were pressureless sintered at 1800{degrees}C to densities above 98.5 % showing a homogeneous microstructure with average grain sizes between 2 and 2.5 {mu}m, a fracture strength of about 650 MPa and fracture toughness around 3.0 MPa{sup {sm_bullet}} m{sup 0.5}.
- OSTI ID:
- 99189
- Report Number(s):
- CONF-940911-; TRN: 95:005310-0079
- 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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