Metal matrix composites (MMCs) are considered as a possible material to replace the materials actually used in some automotive and railway industrial components. Two different ways of taking advantage of the properties of MMCs at low cost are presented: locally reinforced aluminium components and new castable aluminium MMCs developed by the London & Scandinavian Metallurgy Co. (LSM). The materials chosen were AS12UNG aluminium alloy (Al-(11-13)Si-(0.8-1.3Cu)-(0.7-1.3)Mg, wt%) reinforced with 7 volume% TiB2 (for car and motorcycle pistons) and both, AS12UNG with 7% TiB2 and AS9U3G (Al-(7.5-9.5)Si-(3.0-4.0)Cu-1.0Mg, wt%) aluminum alloy (for train brake disc). The AS9U3 Al-alloy (Al-(7.5-9.5)Si-(3.0-4.0)Cu, wt%) reinforced with 7 volume% TiB2 is used for clutch disc. The process of reinforcement of Al alloy with TiB2 particles developed by LSM is called the self-propagating high temperature synthesis process and consists of introducing K2TiF6 and KBF4 molten salts into the aluminium melt. The homogeneously distributed TiB2-particles obtained are normally very small and this is advantageous in lowering maching costs. The synthesis is less costly than other synthesis processes because the reaction between the salts and the Al is an exothermic reaction.
Development of low cost metal matrix composites for commercial applications
Entwicklung von kostengünstigen Metallmatrix-Verbundwerkstoffen für kommerzielle Anwendungen
Materials Science and Technology ; 16 , 7/8 ; 743-746
2000
4 Seiten, 6 Bilder, 13 Quellen
Aufsatz (Zeitschrift)
Englisch
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