The overview describes the current status of the materials investigations for Reusable Launch Vehicles (RLV) which are carried out in context of FESTIP (Future European Space Transportation Investigations Programme). The goal is to improve selected advanced materials and coating, and to test the mechanical properties of these materials. The following classes of materials have been chosed for the test. The gamma-TiAl based alloy(Ti47Al2Cr0.2Si) and (Ti48Al2Cr2Nb) are of special interest as structural materials for hot skins and thermal protection systems and as matrix materials for intermetallic matrix composites(IMC). The materials will be inspected by means scanning electron spectroscopy(SEM), x-ray diffraction(XRD) and energy dispersive analyse(EDX) as well as Rockwell indentation method(HRC). Additionally cycling tests at constant temperature will be performed. The best candidates for thin-wall structural elements are C/SiC materials, but the main problem by their application is the oxidation at high temperatures. For the oxidation protection two ways are investigated: vacuum infiltration by slurry-technique and application of sol-gel technique. The Dispersion Strengthened Aluminium DS-Al produced by cryogenic milling consist of small nanoscale AlN particles and small grain size. This makes DS-AL temperature stable with tensile strength of 100-120 MPa at 450 deg C. The material chosen as candidate for cryogenic tanks is the carbon fiber IM7 which the cyanate thermoset matrix 954-2A delivered as a prepreg. The another material for this application is Al-Li alloy. The class of fiber reinforced ceramic C/Sic is suitable for the propulsion systems too. To simulate enviromental conditions for the propulsion the following test facilities were selected: fast flow reactor, micro combuster test bench, plasma wind tunnel. The another goal of the project is to provide technical solutions for the oxidation protection of selected refractory metals(Cb 275, Ta10W, TZM) as candidates for many high temperature aerospace components.
FESTIP: Technology development in materials
Technologische Entwicklung in Werkstoffen
Spacecraft Structures, Materials & Mechanical Testing, International Conference, European Space Agency, 1996 ; 1085-1096
1996
12 Seiten, 9 Bilder, 5 Tabellen
Conference paper
English
Raumfahrtindustrie , Hochtemperaturschutzschicht , Hochtemperaturwerkstoff , hochschmelzendes Metall , faserverstärkter Werkstoff , dispersionsgehärtetes Metall , intermetallische Verbindung , Oxidationsschutz , Aluminiumlegierung , Titanlegierung , Rasterelektronenmikroskopie , Röntgenanalyse , energiedispersive Röntgenspektrometrie , Rockwell-Versuch , Biegeprüfung , Aluminiumlithiumlegierung
FESTIP: technology development in materials
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