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Invar Kovar Giass Sealing42 Expanded glass alloy
Category :
Metals and minerals->Hard metal->NICKEL
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Product Specification
Model No:
Invar Kovar Giass Sealing42
Country
CN
Brand
TANKII
Materials
FeNi
Size
To discuss millimeters
Weight
100kg
Color
silvery
Packing
Wooden cases or cartons
Minimum Order
100kg
Payment Term
T/T,T/C,Paypal
Product Detail
Kovar also known as Kovar alloy. it was invented to meet the need for a reliable glass-to-metal seal, which is required in electronic devices such as light bulbs, vacuum tubes, cathode ray tubes, and in vacuum systems in chemistry and other scientific research. Most metals cannot seal to glass because their coefficient of thermal expansion is not the same as glass, so as the joint cools after fabrication the stresses due to the differential expansion rates of the glass and metal cause the joint to crack.
(Invar) is used where high dimensional stability is required, such as precision instruments, clocks, seismic creep gauges, television shadow-mask frames, valves in motors, and antimagnetic watches. In land surveying, when first-order (high-precision) elevation leveling is to be performed, the Level staff (leveling rod) used is made of Invar, instead of wood, fiberglass, or other metals. Invar struts were used in some pistons to limit their thermal expansion inside their cylinders.
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