产品信息 - Invar Kovar Giass Sealing42 Expanded glass alloy->NICKEL

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Huona (Shanghai) New Material Co., Ltd.

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Invar Kovar Giass Sealing42 Expanded glass alloy

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冶金礦產->重金屬->鎳

Invar Kovar Giass Sealing42 Expanded glass alloy

产品规格

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

产品描述

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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