Manufacturing of Composites by Pressure Infiltration, Structure and Mechanical Properties

Orbulov, Imre Norbert and Németh, Árpád and Dobránszky, János (2008) Manufacturing of Composites by Pressure Infiltration, Structure and Mechanical Properties. In: Gépészet 2008: Proceedings of Sixth Conference on Mechanical Engineering. Budapesti Műszaki és Gazdaságtudományi Egyetem, Budapest. ISBN 978-963-420-947-8

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Abstract

This paper presents the possibility of composite block production by using pressure infiltration technology. This method uses the pressure of an inert gas (usually argon or nitrogen) to force the melted matrix material to infiltrate the reinforcing elements. Two types of materials were considered: metal matrix syntactic foam and carbon fibre reinforced metal matrix composite. Physical and mechanical investigations – such as optical microscopy, scanning electron microscopy (SEM), X-ray diffractography (XRD), tensile and upsetting tests (considering aspect ratio) – were performed. The results of measurements are summarized briefly here. Microscopic investigations showed almost perfect infiltration. XRD measurements and tensile tests revealed negative effect of an intermetallic phase (Al(4)C(3)) on ultimate tensile strength (UTS). Syntactic foams showed plateau region in their upsetting diagrams. The effect of aspect ratio was also investigated. Specimens with higher aspect ratios showed higher peak stress and higher modulus of elasticity. In the case of carbon fibre reinforced metal matrix composites Al(4)C(3) ensured high compressive fracture strength.

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