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Casting particulate and fibrous metal-matrix composites by vacuum infiltration of a liquid metal under an inert gas pressure

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Abstract

A new method of making metal-matrix composites is reported. This method combines the essentials of three liquid-phase fabrication methods: (i) vacuum infiltration, (ii) infiltration under an inert gas pressure, and (iii) squeeze casting. In this method, the particulate or fibrous preform is placed in a mould and the matrix alloy is placed above the preform. The matrix alloy is heated to the liquidus temperature together with the mould and the preform under vacuum. Then an inert gas like argon is compressed on to the top surface of the matrix-alloy melt, forcing the melt to infiltrate the preform. The pressure is 1000 to 2500 psi. As the melt is just at liquidus temperature, it is much lower than that used in squeeze casting. Moreover, the pressure is an order of magnitude lower than that used in squeeze casting. The low temperature lessens the interfacial reaction between the matrix and the filler, while the low pressure essentially eliminates preform compression. This method has been successfully used to fabricate aluminium-matrix composites reinforced by short ceramic fibres, continuous ceramic fibres, SiC particles, Al2O3 particles, graphite flakes and SiC whiskers.

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Author notes

  1. Jingyu Yang

    Present address: Department of Materials Science and Engineering, Nanjing Institute of Technology, Nanjing, People's Republic of China

Authors and Affiliations

  1. Composite Materials Research Laboratory, Fumas Hall, State University of New York, 14260, Buffalo, NY, USA

    Jingyu Yang & D. D. L. Chung

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  1. Jingyu Yang
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  2. D. D. L. Chung
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Yang, J., Chung, D.D.L. Casting particulate and fibrous metal-matrix composites by vacuum infiltration of a liquid metal under an inert gas pressure. J Mater Sci 24, 3605–3612 (1989). https://doi.org/10.1007/BF02385746

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  • DOI: https://doi.org/10.1007/BF02385746

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