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Flüssigphasengesintertes Siliziumkarbid mit Plateletverstärkung für erhöhte Bruchzähigkeiten.

Abschlußbericht BMFT 03M 2091 B.
Toughening of liquid phase sintered silicon carbide reinforced with platelets
: Adler, J.; Stockmann, J.
: Bundesministerium für Forschung und Technologie -BMFT-, Bonn

Bonn, 1992, 37 S. : Abb.,Tab.,Lit.
Fraunhofer IKTS ()
Drucklossintern; Flüssigphasensintern; Gefügeverstärkung; liquid phase sintering; Platelet; pressureless sintering; reinforcement; silicon carbide; Siliziumkarbid

The main purpose of the project was to develop a pressureless sintered Silicon Carbide ceramic reinforced with platelets to reach both higher toughness and strength at elevated temperatures. In detail fundamental works in selection of the ceramic matrix were performed, but also forming and pressureless sintering of the platelet composite was carried out. The matrix phase was built up of a Silicon Carbide ceramic using Alumina-Yttria additives. In addition to varying sintering parameterrs the amount and ratio of the additives was changed. It has been shown that alumina content is the main factor that affects sintering activity. By using conventional PM processing a homogeneous and isotropic arrangement of the platelets has been obtained. A 10 to 15 % platelet composite was densified to bigger than 95 %th.D. using the pressureless sintering technique. This result essentially demonstrates the possibility of making dense platelet reinforced composites by pressureless sintering.