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Ohmalloy4J29 Kovar strip 0.2mm thickness for product Metal-glass case

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City: Shanghai
Province/State: Shanghai
Country/Region: China
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Ohmalloy4J29 Kovar strip 0.2mm thickness for product Metal-glass case

Brand Name : Ohmalloy
Model Number : 4J29
Certification : ISO,SGS
Place of Origin : SHANGHAI
MOQ : 10kg
Price : USD23-30/kg
Payment Terms : L/C, D/A, D/P, T/T, Western Union, MoneyGram
Supply Ability : 5000kg/month
Delivery Time : 7-20days after your deposit recieved
Packaging Details : Wooden box
Type : 4J29
Color : Mirror,Bright
Thickness : 0.02mm
Application : Metal-Glass-Case
Sample free or not : Free Sample
Package : on spool,in wooden box
Material : kovar alloy
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Ohmalloy4J29 Kovar strip 0.2mm thickness for product Metal-glass case

OhmAlloy-4J29 (Expansion alloy,kovar alloy, kovar metal)
(Common Name: Kovar, Nilo K, KV-1, Dilver Po, Vacon 12)

OhmAlloy-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.


OhmAlloy-4J29was 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.


OhmAlloy-4J29 not only has thermal expansion similar to glass, but its nonlinear thermal expansion curve can often be made to match a glass, thus allowing the joint to tolerate a wide temperature range. Chemically, it bonds to glass via the intermediate oxide layer of nickel oxide and cobalt oxide; the proportion of iron oxide is low due to its reduction with cobalt. The bond strength is highly dependent on the oxide layer thickness and character. The presence of cobalt makes the oxide layer easier to melt and dissolve in the molten glass. A grey, grey-blue or grey-brown color indicates a good seal. A metallic color indicates lack of oxide, while black color indicates overly oxidized metal, in both cases leading to a weak joint.


Mainly used in electric vacuum components and emission control, shock tube, igniting tube, glass magnetron, transistors, seal plug, relay, integrated circuits lead, chassis, brackets and other housing sealing.


Materials :https://www.youtube.com/watch?v=rUOQtkjdYlo

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

Code of conditionConditionWireStrip
RSoft≤585≤570
1/4I1/4 Hard585~725520~630
1/2I1/2 Hard655~795590~700
3/4I3/4 Hard725~860600~770
IHard≥850≥700

Typical Physical properties

Density (g/cm3)8.2
Electrical resistivity at 20℃(Ωmm2/m)0.48
Temperature factor of resistivity(20℃~100℃)X10-5/℃3.7~3.9
Curie point Tc/ ℃430
Elastic Modulus, E/ Gpa138

Coefficient of expansion

θ/℃α1/10-6-1θ/℃α1/10-6-1
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/℃100200300400500
λ/ W/(m*℃)20.621.522.723.725.4


The heat treatment process

Annealing for stress reliefHeated to 470~540℃ and hold 1~2 h. Cold down
annealingIn vacuum heated to 750~900℃
Holding time14 min~1h.
Cooling rateNo more than 10 ℃/min cooled to 200 ℃

Style of supply

Alloys NameTypeDimension
OhmAlloy-4J29WireD= 0.1~8mm
OhmAlloy-4J29StripW= 5~250mmT= 0.1mm
OhmAlloy-4J29FoilW= 10~100mmT= 0.01~0.1
OhmAlloy-4J29BarDia= 8~100mmL= 50~1000


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Ohmalloy4J29 Kovar strip 0.2mm thickness for product Metal-glass case Images

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