Kovar Strip/Kovar Sheet

• Customization: Available
• Product Type: Strip
• Material: Feni Alloys
• Model NO.: Kovar
• Condition: Bright,Soft
• Brand: Ualloy
• Transport Package: Coil, Waterproof Paper, Plywood Pallet
• Specification: GB/T14985
• Trademark: Ualloy
• Origin: China
• HS Code: 72269990
• Production Capacity: 10 Tons/Month

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 20ºC(mm^2/m)	0.48
Temperature factor of resistivity(20ºC~100ºC)X10^-5/ºC	3.7~3.9
Curie pointTc/ ºC	430
Elastic Modulus, E/ Gpa	138

 
Coefficient of expansion

θ/ºC	α1/10^-6ºC^-1	θ/ºC	α1/10^-6ºC^-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 470~540ºC and hold 1~2 h. Cold down
annealing	In vacuum heated to 750~900ºC
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