- cenosphere
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A porous or hollow carbonaceous sphere-like particle formed during pyrolysis or in the course of the combustion of coal
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cenosphere
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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
Syntactic foam — Syntactic foams are composite materials synthesized by filling a metal, polymer or ceramic matrix with hollow particles called microballoons. The presence of hollow particles results in lower density, higher strength, a lower thermal expansion… … Wikipedia
Pozzolana — Pozzolana, also known as pozzolanic ash, is a fine, sandy volcanic ash, originally discovered and dug in Italy at Pozzuoli in the region around Vesuvius, but later at a number of other sites. Vitruvius speaks of four types of pozzolana: black,… … Wikipedia
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
