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Mechanical behaviour of pressureless sinterd SiC at high temperatures.

Mechanisches Hochtemperaturverhalten von drucklos gesintertem SiC
: Wolf, C.; Huebner, H.; Adler, J.

Duran, P.; Fernandez, J.F. ; European Ceramic Society:
Third Euro-Ceramics 1993. Proceedings of the Third European Ceramic Society Conference. Vol.3: Engineering ceramics
Castellon de la Plana: Faenza Editrice Iberica, 1993
ISBN: 84-87683-07-X
Euro-Ceramics (ECerS) <3, 1993, Madrid>
Fraunhofer IKTS ()
Bruchzähigkeit; creep; Flüssigphasensintern; fracture toughness; high temperature property; Hochtemperatureigenschaft; Kriechen; liquid phase sintering; LPS-SiC; Siliciumkarbid; silicon carbide

Pressureless sintering is a useful fabrication method for ceramic bodies since it provides a variety of shapes at relatively low costs. Silicon carbide was shown to be sintered at already 1900 deg. cent. to more than 98 percent of the theoretical density by using various amounts of Al2O3/Y2O3 as sintering additive. On cooling the additive formed an intercrystalline grain-boundary phase. Fracture toughness was found to be about 6 MPa sqrt m, which is about twice that of SSiC with B/C additive. Room- temperature strength of about 520 MPa was retained nearly 85 percent at 1400 deg. cent. As could be expected by the presence of the grain-boundary phase, the creep rates in bending were about two orders of magnitude higher than those published for SSiC with B/C additive, but are still compareable to those of HPSiC at the same testing conditions.