Entwicklung eines wirtschaftlichen Herstellungsverfahrens fuer kompliziert geformte, spritzgegossene Si_3N_4-Bauteile. Teilprojekt: Werkstoff- und Verfahrensentwicklung fuer kostenguenstige Siliciumnitrid-Bauteile auf Basis von Silicium-Siliciumnitrid-Pulvermischungen Abschlussbericht

The objectives of the project are the development of a cost-effective silicon nitride material and an economic production process for complexly shaped parts by the application of the injection-moulding process of ceramic powders. A material sinterable under normal-pressure on the basis of reaction-bonded silicon nitride (SRBSN) has been developed, using silicon - silicon nitride mixtures. For these mixtures a cost-effective and rapid nitridation process could be realized, leading to a combination in a one-step process. By application of the injection-moulding shaping process, this material could be processed to bucket tappet and crankshaft components. Already during the running time of the project, the developed material has become established as a production material. Moreover, the injection-moulding shaping rocess has been applied for the production of further technically applied silicon nitride components, requiring high precision and complex geometries. By application of injection-moulding as a 'near-netshape' process, ceramic components could be produced which meet the requirements concerning dimensional tolerances and final contour accuracy. An expensive finishing step is no longer required. (orig.)SIGLEAvailable from TIB Hannover: F98B327+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman