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Kovar Alloy 4J29 Wire Nickel - Cobalt Ferrous Alloy For Chemistry Research

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Good quality Bimetallic Strip for sales
Good quality Bimetallic Strip for sales
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Kovar Alloy 4J29 Wire Nickel - Cobalt Ferrous Alloy For Chemistry Research

China Kovar Alloy 4J29 Wire Nickel - Cobalt Ferrous Alloy For Chemistry Research supplier

Large Image :  Kovar Alloy 4J29 Wire Nickel - Cobalt Ferrous Alloy For Chemistry Research

Product Details:

Place of Origin: China(Shanghai)
Brand Name: OHMALLOY
Certification: ISO
Model Number: 4J29

Payment & Shipping Terms:

Minimum Order Quantity: 20kg
Price: negotiable
Packaging Details: In Coil
Supply Ability: 5000kg/month
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Detailed Product Description
Material: 4J29 Supply Type: Wire
Color: Primary Color Surface: Bright And Smooth

OhmAlloy-4J29 (Expansion alloy)
(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.

 

Kovar is a nickel–cobalt ferrous alloy compositionally identical to Fernico, designed to be compatible with the thermal expansion characteristics of borosilicate glass (~5 × 10−6 /K between 30 and 200 °C, to ~10 × 10−6 /K at 800 °C) in order to allow direct mechanical connections over a range of temperatures. It finds application in electroplated conductors entering glass envelopes of electronic parts such as vacuum tubes (valves), X-ray and microwave tubes and some lightbulbs.

The name Kovar is often used as a general term for Fe–Ni alloys with these particular thermal expansion properties. Note the related particular Fe–Ni alloy Invar which exhibits minimum thermal expansion.

 

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.

 

 

 

 

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

 

Kovar Alloy 4J29 Wire Nickel - Cobalt Ferrous Alloy For Chemistry Research

                                                                                                                           

Kovar Alloy 4J29 Wire Nickel - Cobalt Ferrous Alloy For Chemistry Research

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Tel: +8613795230939

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