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Ohmalloy Material Co.,Ltd

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Good quality Bimetallic Strip for sales
Good quality Bimetallic Strip for sales
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Ohmalloy 4J29 Kovar Strip 0.2mm Thickness For Product Metal - Glass Case

China Ohmalloy 4J29 Kovar Strip 0.2mm Thickness For Product Metal - Glass Case supplier
Ohmalloy 4J29 Kovar Strip 0.2mm Thickness For Product Metal - Glass Case supplier Ohmalloy 4J29 Kovar Strip 0.2mm Thickness For Product Metal - Glass Case supplier

Large Image :  Ohmalloy 4J29 Kovar Strip 0.2mm Thickness For Product Metal - Glass Case

Product Details:

Place of Origin: SHANGHAI
Brand Name: Ohmalloy
Certification: ISO,SGS
Model Number: 4J29

Payment & Shipping Terms:

Minimum Order Quantity: 10kg
Price: USD23-30/kg
Packaging Details: Wooden box
Delivery Time: 7-20days after your deposit recieved
Payment Terms: L/C, D/A, D/P, T/T, Western Union, MoneyGram
Supply Ability: 5000kg/month
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Detailed Product Description
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

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%

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

Code of condition Condition Wire Strip
R Soft ≤585 ≤570
1/4I 1/4 Hard 585~725 520~630
1/2I 1/2 Hard 655~795 590~700
3/4I 3/4 Hard 725~860 600~770
I Hard ≥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/ Gpa 138

 

 

Coefficient of expansion

θ/℃ α1/10-6-1 θ/℃ α1/10-6-1
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/℃ 100 200 300 400 500
λ/ W/(m*℃) 20.6 21.5 22.7 23.7 25.4

 

 

The heat treatment process

Annealing for stress relief Heated to 470~540℃ and hold 1~2 h. Cold down
annealing In vacuum heated to 750~900℃
Holding time 14 min~1h.
Cooling rate No more than 10 ℃/min cooled to 200 ℃

 

Style of supply

Alloys Name Type Dimension
OhmAlloy-4J29 Wire D= 0.1~8mm
OhmAlloy-4J29 Strip W= 5~250mm T= 0.1mm
OhmAlloy-4J29 Foil W= 10~100mm T= 0.01~0.1
OhmAlloy-4J29 Bar Dia= 8~100mm L= 50~1000

 

 

Contact Details
Ohmalloy Material Co.,Ltd

Contact Person: Mr. Qiu

Tel: +8613795230939

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