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Colour of gas-pressure-sintered silicon nitride ceramics. Part 1 : Experimental data

: Herrmann, M.; Goeb, O.


Journal of the European Ceramic Society 21 (2001), No.3, pp.303-314
ISSN: 0955-2219
Journal Article
Fraunhofer IKTS ()
silicon nitride ceramic; gas pressure; sintering

Gas-pressure sintering is the most widely used process for manufg. high-performance silicon nitride ceramics. The interaction between the sintering atm. and the silicon nitride ceramics is often featured by an inhomogeneous gray coloration of the near surface area and a gray coloration of the bulk material. In Part I of this work the dependence of the color of the material on the sintering parameters was investigated exptl. It was shown that silicon inclusions having sizes ranging from a few nm up to several .mu.m cause the coloration of the material. Gas pressure, temp. and sintering time influence the formation of the inhomogeneous gray coloration.