Cutting of SiC Fibers for Ti‐MMC Applications

Abstract

Modern materials research in the field of aeronautics seeks new methods to improve the performance of combustion engines and turbines by reducing weight using materials with high specific strength and stiffness. [1] Since the growth of international air traffic is about 5 % per year and the market demands economical turbines the need of lightweight materials becomes clear. [2] One way to achieve this objective is to use metal matrix composites (MMC). Most promising is the combination of SiC fibers together with TiAl6V4 (Ti-MMC). As Titanium 6±4 can be easily diffusion bonded, one fabrication route is the hot isostatic pressing (HIP) of Ti-coated SiC fibers.A feasibility study has been carried out by MTU Aero Engines, which proofed a possible weight reduction by 25 % using Ti-MMC.Most recently the successful application of this composite material as a landing gear component has been reported in literature. [3] The aim of this combination is to take advantage of the high Young's modulus of the SiC fibers and the low weight of Titanium (high specific stiffness). The SiC fibers, which are

Processing and characterization of large diameter ceramic SiCN monofilaments from commercial oligosilazanes

“…For MMCs applications, such as combustion engines and high efficiency turbines, titanium matrix composites (TMCs) reinforced with CVD SiC monolaments are promising candidates, as they combine the high strength, stiffness and creep resistance of SiC monolaments with the high ductility, toughness and corrosion resistance of titanium alloys. 7,8 Because SiC bers are generally reactive with titanium alloys at high temperatures, fabrication processes that allow a controlled chemical reaction with the metal matrix, mainly dominated by diffusion, enables the formation of a strong ber-matrix interface and good adhesion. This good adhesion is needed for the efficient load transfer from the metal matrix to the SiC bers.…”