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KOVAR
(Ni,
Fe, Co alloy)
MATERIAL
OVERVIEW
Characteristics:
Kovar has a wide usage in the electronics industry,
such as metal parts bonded to hard glass envelopes.
These parts are used for such devices as power tubes
and X-ray tubes, etc. In the semiconductor industry
kovar is used in hermetically sealed packages for both
integrated and discrete circuit devices. Kovar is
provided in a variety of forms to facilitate efficient
manufacturing of various metal parts. It has thermal
expansion characteristics matching those of hard
glass. Used for matched expansion joints between
metals and glass or ceramics.
GENERAL
PROPERTIES
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Symbol:
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Ni,
Fe, Co alloy
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Weight
Percent:
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29%
Ni, 17% Co, 53% Fe, 1% trace
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Density:
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8.36
g/cm3
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Melting
Point:
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2642
oF
(1450 oC)
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Thermal
Conductivity:
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16.8
W/mk
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Electrical
Resistivity:
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0.49
microhm-m
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Expansion
Coefficient:
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5
ppm/oC
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TYPICAL
ANALYSES
Chemical
Composition
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Material
/ Purity:
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Kovar
|
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Mn
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0.30
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Si
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0.10
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Ni
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29.0
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Co
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17.0
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Fe
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Bal.
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KOVAR
WIRE
|
Material
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Purity
|
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Kovar
Wire .005” to .125”
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|
Wire
is spooled to order and sold by the foot or meter.
KOVAR
ROD
|
Material
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Purity
|
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Kovar
Rod .030” to 1”
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Rod
is cut to order and sold by the inch or foot.
KOVAR
FOIL
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Material
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Purity
|
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Kovar
Foil .003”
|
|
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Kovar
Foil .004”
|
|
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Kovar
Foil .005”
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|
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Kovar
Foil .006”
|
|
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Kovar
Foil .007”
|
|
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Kovar
Foil .008”
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Kovar
Foil .009”
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Foil
is cut to order and sold by the square inch or square
foot.
KOVAR
SHEET
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Material
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Purity
|
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Kovar
Sheet .010” to 0.125”
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Sheet
is cut to order and sold by the square inch or square
foot.
KOVAR
POWDER, SHOT, PELLETS, & INGOT
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Material
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Purity
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Kovar
Pellets .125"D
X .125"L
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Kovar
Pellets .250"D X .250"L
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Powder,
shot, pellets, and ingots are packaged to order and
sold by the gram or kilogram.
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