Carbon fibre reinforced aluminium composites can be fabricated successfully by gas pressure infiltration, leading to material with remarkable good bending strength (1400 MPa) ang hogh Youngs modulus (higher than 240 MPa). The influence of pressure preform temperature during infiltration was investigated and a direct relationship was found between the mechanical properties, the applied pressure and the preform temperature. It can be concluded that a pressure of approximately 60 bar is sufficient to fill the preforms completely and to obtain specimens with high strength and stiffness. However, in the case of gas pressure infiltration it seems more advantageous to use higher pressures to increase the cooling of the composite and thus to minimise the amount of aluminium carbide. High modulus carbon fibres are chosen without any expensive and time consuming fibre surface pretreatment. The M40 fibres were found to be less reactive than HR40 and, therefore, better suitable for aluminium MMC (metal matrix composite). Since 2 D or 3 D woven or braided fabrics can be manufactured from Hm fibres like the M40 fibres it is possible to produce high quality Al-MMc inserts. By using appropriate insert geometry and insert surface design together with optimised casting technology, Al-fibre MMcs can be used as selective reinforcements for Mg castings.
Fabrication of carbon fibre reinforced Al-inserts for local reinforcement of automotive components
Advances in Automotive and Transportation Technology and Practice for the 21st Century, ISATA, ISATA, 32 ; Materials for energy-efficient vehicles ; 185-192
1999
8 Seiten, 5 Bilder, 2 Tabellen, 7 Quellen
Aufsatz (Konferenz)
Englisch
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