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Kovar Strip/ Kovar Sheet

China Kovar Strip/Kovar Sheet, Find details about China Kovar Strip, Kovar Sheet from Kovar Strip/Kovar Sheet

Model NO.
Kovar
Trademark
Ualloy
Specification
GB/T14985
Origin
China
HS Code
72269990
Model NO.
Kovar
Trademark
Ualloy
Specification
GB/T14985
Origin
China
HS Code
72269990
(Common Name:Kovar, Nilo K, KV-1, Dilver Po, Vacon 12)
UALLOY-4J29 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.
UALLOY-4J29 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.
Mainly used inelectric vacuumcomponents andemission control,shocktube, igniting tube, glassmagnetron, transistors, sealplug, relay, integrated circuitslead, chassis, brackets and otherhousingsealing.

Kovar Strip/Kovar Sheet
 

Normal composition%

Ni28.5~29.5FeBal.Co16.8~17.8Si≤0.3
Mo≤0.2Cu≤0.2Cr≤0.2Mn≤0.5
C≤0.03P≤0.02S≤0.02  
 

Tensile Strength, MPa

 

Typical Physical properties

Density (g/cm3)8.2
Electrical resistivity at 20ºC(mm2/m)0.48
Temperature factor of resistivity(20ºC~100ºC)X10-5/ºC3.7~3.9
Curie pointTc/ ºC430
Elastic Modulus, E/ Gpa138
 
Coefficient of expansion
θ/ºCα1/10-6ºC-1θ/ºCα1/10-6ºC-1
20~607.820~5006.2
20~1006.420~5507.1
20~2005.920~6007.8
20~3005.320~7009.2
20~4005.120~80010.2
20~4505.320~90011.4
 
Thermal conductivity
θ/ºC100200300400500
λ/ W/(m*ºC)20.621.522.723.725.4
 
The heat treatment process
Annealing for stress reliefHeated to 470~540ºC and hold 1~2 h. Cold down
annealingIn vacuum heated to 750~900ºC
Holding time  14 min~1h.
Cooling rateNo more than  10 ºC/min cooled to 200 ºC
 
Style of supply
Alloys NameTypeDimension
UAlloy-4J29WireD=0.1~8mm
UAlloy-4J29StripW= 5~250mmT= 0.1mm
UAlloy-4J29FoilW= 10~100mmT= 0.01~0.1
UAlloy-4J29BarDia=8~100mmL=50~1000
 
 

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