·
Linear Formula CaSi2
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Molecular Weight 96.25
Calcium silicide (CaSi2), also
called calcium disilicide, is an inorganic compound, a silicide of calcium. It is a
whitish or dark grey to black solid matter with melting point 1033 °C.
Detailed description
It is insoluble in water, but may decompose
when subjected to moisture, evolving hydrogen and
producing calcium hydroxide.
Decomposes in hot water. It is flammable and may ignite spontaneously in air.
Its CAS number is 12013-56-8.
Industrial calcium silicide usually contains iron and aluminium as the primary
contaminants, and low amounts of carbon and sulfur.
Uses
Alloys
Calcium silicide is used for manufacture of special
metal alloys, e.g. for removing phosphorus and as a deoxidizer.
Pyrotechnics
In pyrotechnics, it is used as fuel
to make special mixtures, e.g. for production of smokes, in flash compositions, and in percussion caps. Specification for
pyrotechnic calcium silicide is MIL-C-324C. In some mixtures it may be
substituted with ferrosilicon. Silicon-based
fuels are used in some time delay mixtures, e.g. for controlling of explosive bolts,
hand grenades, and infrared decoys.[citation needed] Smoke compositions often contain hexachloroethane; during burning
they produce silicon tetrachloride, which, like titanium tetrachlorideused in smoke-screens, reacts with air
moisture and produces dense white fog. Gum arabic is used in
some mixtures to inhibit calcium silicide decomposition.
Heating food
Self-heating cans of
military food rations developed during World War II used a thermite-like mixture of 1:1 iron(II,III) oxide and
calcium silicide. Such mixture, when ignited, generates moderate amount of heat
and no gaseous products.
PRICE
$119.05/KG OR $54.11/IB
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