Abstract
Metal matrix syntactic foams (MMSF) are foam composites obtained by filling hollow and/or porous particles into a metal matrix. MMSF are promising materials in defense, aerospace, automotive, marine and engineering applications. Mechanical and physical properties of MMSF can be tailored to reach better structural and/or functional behaviors by fitting processing and tailoring parameters. Some of these parameters are: reinforcement size, volume fraction, distribution of reinforcements and chemical composition. Three techniques are available to manufacture MMSF: Stir casting/vortex method (SC), powder metallurgy (P/M) and infiltration routes. Infiltration process is by far the main employed for making MMSF, it allows a large range of reinforcement (30 vol % to 78 vol %) and offers great advantages compared to other techniques. This paper reviews infiltration routes used to date, their advantages and drawbacks, the main processing parameters of each route, and a relation of representative studies developed to date on the synthesizing of MMSF by molten infiltration processes.
Highlights
Cellular metallic materials have great combinations of mechanical and physical properties [1]
This paper reviews infiltration routes used to date, their advantages and drawbacks, the main processing parameters of each route, and a relation of representative studies developed to date on the synthesizing of Metal matrix syntactic foams (MMSF) by molten infiltration processes
Studies available to date about MMSF manufacturing routes refer to molten infiltration techniques (MIT) as quite limited routes
Summary
Cellular metallic materials (foams, honeycombs and lattices) have great combinations of mechanical and physical properties [1]. The conversion of bulk metals into a cellular shape, i.e., the invention of foams, has been driven by the need to achieve lightweight engineering materials with increased specific strength, high damping, exceptional energy absorbing capabilities [2] and high thermal isolation [3]. Mechanical behavior can be characterized by means of international standards, e.g., the ISO-13314 (English) [14] and DIN-50134 (German) [15] are suitable for compressive testing while DIN-50099 (German) [16] is adequate for tensile testing These guidelines establish a common framework for studying MMSF properties and comparing them with samples developed in other studies. It includes a comparison of representative studies developed to date on the synthesizing of MMSF by molten infiltration process
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