• Kovar Alloy Strip Fe-Ni-Co Glass Sealing Alloy Strip
  • Kovar Alloy Strip Fe-Ni-Co Glass Sealing Alloy Strip
  • Kovar Alloy Strip Fe-Ni-Co Glass Sealing Alloy Strip
  • Kovar Alloy Strip Fe-Ni-Co Glass Sealing Alloy Strip
  • Kovar Alloy Strip Fe-Ni-Co Glass Sealing Alloy Strip

Kovar Alloy Strip Fe-Ni-Co Glass Sealing Alloy Strip

Classification: Kovar Alloy
Density: 8.2
Resisivity: 0.48
Curie Point: 430
State: Soft
Brand: Kovar
Customization:

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Basic Info.

Model NO.
Kovar
Chemical Composition
Feni29co17
Transport Package
Export Packing
Specification
Can discuss
Trademark
HUONA
Origin
Shanghai
HS Code
72269990
Production Capacity
200 Ton/Month

Product Description

Kovar Alloy Strip Fe-Ni-Co Glass Sealing Alloy Strip

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

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.

Kovar 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 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.

Chemical composition  4J29 bar

alloy C Mn Si P S Ni Cr Co Cu Mo Fe
4J29 ≤0.03 ≤0.50 ≤0.30 ≤0.020 ≤0.020 28.5~29.5 ≤0.20 16.8~17.8 ≤0.2 ≤0.2 balance

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 20ºC(OMmm2/m) 0.48
Temperature factor of resistivity(20ºC~100ºC)X10-5/ºC 3.7~3.9
Curie point Tc/ ºC 430
Elastic Modulus, E/ Gpa 138
 

 

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

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

Style of supply

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

L= 50~1000mm

FAQ

1. What's the minimum quantity customer can order?
If we have your size in stock, we can provide any quantity you want.
If we do not have, for spool wire, we can produce 1 spool, about 2-3kg. For coil wire, 25kg.
2. How can you pay for small sample amount?
We have Western union account, wire transfer for sample amount also ok.

3. Customer do not have express account. How will us arrange the delivery for sample order?
Just need to provide your address information, we will check the express cost, you can arrange the express cost together with sample value.

4. What's our payment terms?
We can accept LC T/T payment terms, it also depending on delivery and total amount. Let's talk more in details after getting your detailed requirements.

5. Do you provide free samples?
If you want several meters and we have stock of your size, we can provide, customer need to bear the International express cost.

6. What's our working time?
We will give you reply through email/phone Online contact tool within 24 hours. No matter working day or holidays.
Kovar Alloy Strip Fe-Ni-Co Glass Sealing Alloy Strip
Kovar Alloy Strip Fe-Ni-Co Glass Sealing Alloy Strip
Kovar Alloy Strip Fe-Ni-Co Glass Sealing Alloy Strip
Kovar Alloy Strip Fe-Ni-Co Glass Sealing Alloy Strip
 

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