Paper number 603

ELABORATION AND CHARACTERIZATION OF SIC/TIAL COMPOSITES

Sarala Djanarthany¹, Jean-Claude Viala² , Jean Bouix²

1Université de Marne-la-Vallée,IFI
2rue de la Butte Verte, 93166 Noisy-le-Grand, France
2Laboratoire des Multimatériaux et Interfaces, UMR CNRS 5615,
Université Claude Bernard Lyon I, 43 Boulevard du 11 Novembre 1918,
69622 Villeurbanne, France

Summary

Titanium aluminide matrix composites based on TiAl reinforced with long silicon carbide fibers are developed for a variety of future engine and airframe applications in the aerospace industry. These composites are attractive for their low density and high mechanical properties at elevated temperatures. However the use of these composites requires to overcome their brittleness at room temperature and to develop a specific fabrication method. The aim of the present work concerns the second point. Two types of long fibers were used : the BP SM 1240 and SCS-6 silicon carbide monofilaments. SM 1240/Ti-48Al-2V and SCS-6/Ti-48Al-2V monotapes were firstly prepared by arc plasma spraying. We have then investigated the conditions under which a Ti-48Al-2V alloy powder could be consolidated and the kinetics of fiber damage by chemical reaction with the TiAl base matrix during consolidation. Composite samples were finally fabricated by uniaxial hot-pressing of monotapes and the fiber/matrix interface was characterized.

Keywords

titanium aluminide, silicon carbide fiber, plasma spraying, reaction growth kinetics, uniaxial hot-pressing.