CAS Number 12136-78-6
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Linear Formula MoSi2
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Molecular Weight 152.11
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EC Number 235-231-8
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MDL number MFCD00151535
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PubChem Substance ID 24854627
Molybdenum disilicide (MoSi2, or molybdenum silicide), an intermetallic
compound, a silicide of molybdenum, is a refractoryceramic with primary use in heating
elements. It
has moderate density, melting point
2030 °C, and is electrically conductive. At high temperatures it forms a passivation
layer of silicon dioxide, protecting it
from further oxidation. It is a gray metallic-looking material with tetragonal crystal
structure (alpha-modification); its beta-modification is hexagonal and unstable.[3] It is insoluble in most acids but soluble in nitric acid and hydrofluoric
acid.
Detailed description
While MoSi2 has excellent resistance to oxidation
and high Young's modulus at temperatures
above 1000 °C, it is brittle in lower
temperatures. Also, at above 1200 °C it loses creep resistance. These
properties limits its use as a structural material, but may be offset by using it together with another material
as a composite material.
Molybdenum disilicide and MoSi2-based
materials are usually made by sintering. Plasma spraying can be used for
producing its dense monolithic and composite forms; material produced this way
may contain a proportion of β-MoSi2 due to its rapid cooling.
Molybdenum disilicide heating elements can be used
for temperatures up to 1800 °C, in electric furnaces used in laboratory
and production environment in production of glass, steel, electronics, ceramics, and in heat treatment of materials. While
the elements are brittle, they can operate at high power without aging, and
their electrical resistivity does not increase with operation time. Their
maximum operating temperature has to be lowered in
atmospheres with low oxygen content due to breakdown of the passivation layer.
Other ceramic materials used for heating elements
are e.g. silicon carbide, barium titanate, and lead titanate composite materials.
Molybdenum disilicide is used in microelectronics as a contact
material. It is often used as a shunt over polysilicon lines
to increase their conductivity and increase signal speed.
PRICE
$1567/KG OR $712.27/IB
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