Kovar Strip/ Kovar Sheet

Model NO.
Kovar
Specification
GB/T14985
Trademark
Ualloy
Origin
China
HS Code
72269990
Production Capacity
10 Tons/Month
Reference Price
$ 21.60 - 205.20
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Product Description

(Common Name:Kovar, Nilo K, KV-1, Dilver P o, 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.


 

Normal composition%

Ni 28.5~29.5 Fe Bal. Co 16.8~17.8 Si ≤0.3
Mo ≤0.2 Cu ≤0.2 Cr ≤0.2 Mn ≤0.5
C ≤0.03 P ≤0.02 S ≤0.02    
 

Tensile Strength, MPa

 

Typical Physical properties

Density (g/cm3) 8.2
Electrical resistivity at 20 ºC (mm 2 /m) 0.48
Temperature factor of resistivity ( 20 ºC ~100 ºC ) X10 -5 / ºC 3.7~3.9
Curie pointT c / ºC 430
Elastic Modulus, E/ Gpa 138
 
Coefficient of expansion
θ / ºC α 1 /10 -6 ºC -1 θ / ºC α 1 /10 -6 ºC -1
20~60 7.8 20~500 6.2
20~100 6.4 20~550 7.1
20~200 5.9 20~600 7.8
20~300 5.3 20~700 9.2
20~400 5.1 20~800 10.2
20~450 5.3 20~900 11.4
 
Thermal conductivity
θ / ºC 100 200 300 400 500
λ / W/(m* ºC ) 20.6 21.5 22.7 23.7 25.4
 
The heat treatment process
Annealing for stress relief Heated to 470~540 ºC and hold 1~2 h. Cold down
annealing In vacuum heated to 750~900 ºC
Holding time   14 min~1h.
Cooling rate No more than  10 ºC /min cooled to 200 ºC
 
Style of supply
Alloys Name Type Dimension
UAlloy-4J29 Wire D=0.1~8mm
UAlloy-4J29 Strip W= 5~250mm T= 0.1mm
UAlloy-4J29 Foil W= 10~100mm T= 0.01~0.1
UAlloy-4J29 Bar Dia=8~100mm L=50~1000
 
 

 

Alloy