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Technical
Information : Molybdenum |
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Physical Property |
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Atomic
Number |
42 |
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Atomic
Weight |
95.9 |
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Density |
10.2 gms / cc
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Melting
Point |
2615 °c |
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Boiling
Point |
4610° C |
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Specific
heat at 20°c |
0.066 Cal / g / °C
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Electrical
Resistivity at 0°c |
5.2 micro ohms / cm
² / cm |
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Mechanical Property |
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Hardness
( 10 Kg. load ) |
170 - 280
VPN |
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Modulus
of elasticity at 20° C |
33600 Kg. / mm² |
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Chemical Properties |
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a)
Gets oxidized in air above 400° C |
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No reaction
at any temperature with hydrogen |
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Corrosion Resistance |
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a)
No reaction in reducing atmosphere |
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b)
Good resistance to attack by molten
metals such as Mg, Ni, Li, Hg, Na, K |
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c)
No reaction upto 1400° C with
molten glass. |
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Application |
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1)
Lighting. |
Used
as mandrel wire for manufacturing of tungsten filaments.
Also used in lamps for pins and support hooks |
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2).Electron
tubes. |
Moly
rods are used as heater elements and supports in electron
tube because of their good electrical conductivity and
good mechanical propertiesat high temperature. |
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3) High
temperature furnaces. |
Moly in wire, rods, and strip forms is used as a heating
elements in high temperature furnaces operating about
1300° C.
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4) Welding
electrodes. |
Moly
rods are used as electrodes in spot welding machines. |
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5) Semi
conductors |
Thermal
expansion of moly closely matches that with silicon. This
allows the use of moly as supports and contacts for silicon
in semi conductors. |
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6) Other
applications |
Special
bolts, screws and machined parts.
Cupels for the evaporation of metals such as silver and
gold.
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