- Syntactic foam
Syntactic foams are
composite material s synthesized by filling ametal ,polymer orceramic matrix with hollow particles calledmicroballoons . The presence of hollow particles results in lower density, higher strength, a lowerthermal expansion coefficient, and, in some cases, radar or sonar transparency.Tailorability is one of the biggest advantages of these materials. The matrix material can be selected from almost any metal, polymer or ceramic. A wide variety of microballoons are available, including
cenosphere s,glass microsphere s, carbon and polymer microballoons. The most widely used and studied foams are glass microballoon-epoxy , glass microballoon—aluminum andcenosphere -aluminum.The
compressive properties of syntactic foams primarily depend on the properties of microballoons, whereas the tensile properties depend on the matrix material that holds the microballoons togethter. There are two main ways of adjusting the properties of these materials. The first method is to change the volume fraction ofmicroballoon in the syntactic foam structure. The second method is to use microballoons of different wall thickness. In general, the compressive strength of the material is proportional to its density.These materials were developed in early 1960s as
buoyancy aid materials for marine applications; the other characteristics led these materials toaerospace and ground transportation vehicle applications. Among the present applications, some of the common examples are buoyancy modules for marine drilling risers, boat hulls, and parts ofhelicopters andairplane s. New applications are coming up in sports industry; snowski s andAdidas soccer ball s are some of the examples.ee also
*
Glass microsphere
*Foam
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См. также в других словарях:
syntactic foam — n. any of several buoyant materials made up of tiny hollow spheres embedded in a surrounding plastic: used in submersibles, spacecraft, etc. * * * … Universalium
syntactic foam — n. any of several buoyant materials made up of tiny hollow spheres embedded in a surrounding plastic: used in submersibles, spacecraft, etc … English World dictionary
syntactic foam — noun Etymology: syntactic from Greek syntaktikos putting together more at syntactic : a plastic in which preformed cells (as tiny hollow glass spheres) have been incorporated, which can withstand great pressures (as at ocean depths), and which… … Useful english dictionary
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