- Syntactic foam
Syntactic foams are
composite materials synthesized by filling a metal, polymeror ceramicmatrix with hollow particles called microballoons. The presence of hollow particles results in lower density, higher strength, a lower thermal expansioncoefficient, 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
cenospheres, glass microspheres, carbon and polymer microballoons. The most widely used and studied foams are glass microballoon- epoxy, glass microballoon— aluminumand cenosphere-aluminum.
compressiveproperties 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 of microballoonin 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
buoyancyaid materials for marine applications; the other characteristics led these materials to aerospaceand ground transportation vehicle applications. Among the present applications, some of the common examples are buoyancy modules for marine drilling risers, boat hulls, and parts of helicoptersand airplanes. New applications are coming up in sports industry; snow skis and Adidas soccer balls are some of the examples.
Wikimedia Foundation. 2010.
Look at other dictionaries:
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
Syntactic Foams — are composite materials synthesized by filling hollow particles (called microballoons) in metals, polymers or ceramics. Presence of hollow particles provides low density to these materials. These materials were developed in early 1960s as… … Wikipedia
Foam — This article is about the substance formed from trapped gas bubbles. For other uses, see Foam (disambiguation). Soap foam bubbles Contents 1 Definition … Wikipedia
Glass microsphere — For microspheres made of other materials, see Microsphere. SEM micrograph of a glass microsphere in concrete Glass microspheres are microscopic spheres of glass manufactured for a wide variety of uses in research, medicine, consumer goods and… … Wikipedia
Cenosphere — A cenosphere is a lightweight, inert, hollow sphere filled with inert air or gas, typically produced as a byproduct of coal combustion at thermal power plants. The color of cenospheres varies from gray to almost white and their density is about 0 … Wikipedia
MIR (submersible) — Career Russia … Wikipedia
Spock — Species Half Vulcan (paternal) Half Human (maternal) Affiliation Starfleet Vulcan Government Posting USS Enterprise science officer/first officer and commanding officer US … Wikipedia
Composite material — A cloth of woven carbon fiber filaments, a common element in composite materials Composite materials, often shortened to composites or called composition materials, are engineered or naturally occurring materials made from two or more constituent … Wikipedia