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4j29 Kovar Nickel Expansion Alloy Strip For Integrated Circuits Framework
4j29 Kovar Nickel Expansion Alloy Strip For Integrated Circuits Framework
4j29 Kovar Nickel Expansion Alloy Strip For Integrated Circuits Framework
4j29 Kovar Nickel Expansion Alloy Strip For Integrated Circuits Framework
Specifications
Brand Name :
4j29/ Kovar
Model Number :
STAM-29
Certification :
RoHs, ISO 9001
Place of Origin :
China
MOQ :
30
Price :
USD 23-33/KG
Payment Terms :
T/T, L/C, Western Union
Supply Ability :
5000 KG per month
Delivery Time :
25 days
Packaging Details :
Wooden case
Properties :
Sealing Alloy
Shape :
Ribbon
Surface :
Bright (Silver)
Condition :
Soft
Application :
for sealing to glass
Size :
0.1mm~2mm*10mm~22mm
Description

4j29 Kovar Nickel Expansion Alloy Strip For Integrated Circuits Framework

(Common Name: Kovar, NiFeCo29, NiCoFe294,Nilo K)

Controlled Expansion and Glass Sealing Alloys
German standard number Tradename DIN UNS
1.3912 Alloy 36 17745 K93600/93601
1.3917 Alloy 42 17745 K94100
1.3922 Alloy 48 17745 K94800
1.3981 Pernifer2918 17745 K94610
2.4478 NiFe 47 17745 N14052
2.4486 NiFe47Cr 17745 -

General Description
Kovar is a nominal 29%Ni-17%Co-54%Fe alloy that is a well-known glass-sealing alloy suitable for sealing to hard glasses. Kovar has a nominal expansion coefficient of approximately 5 ppm/°C and inflection temperature of ~450 °C (840 °F).

4J29 also known as Fe-Ni-Co Glass Sealing 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.

Kovar (ASTM F15) has been used for making hermetic seals with the harder Pyrex glasses and ceramic materials. This alloy has found wide application in power tubes, microwave tubes, transistors, and diodes. In integrated circuits, it has been used for the flat pack and the dual-in-line package.

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 Domposition

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

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.
4j29 Kovar Nickel Expansion Alloy Strip For Integrated Circuits Framework
TANKII, referring to the presence of high-power production, offers customers buy alloy Kovar in the required quantities and ensures minimum time shipments of rolled metal products, made on the basis of Kovar.

If you have any questions, pls give us message to zlz@tankii.com

Hope we can cooperate with you!

Have a good day!

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4j29 Kovar Nickel Expansion Alloy Strip For Integrated Circuits Framework

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Product Detail
Brand Name :
4j29/ Kovar
Model Number :
STAM-29
Certification :
RoHs, ISO 9001
Place of Origin :
China
MOQ :
30
Price :
USD 23-33/KG
Contact Supplier
4j29 Kovar Nickel Expansion Alloy Strip For Integrated Circuits Framework
4j29 Kovar Nickel Expansion Alloy Strip For Integrated Circuits Framework

Shanghai Tankii Alloy Material Co.,Ltd

Verified Supplier
11 Years
shanghai, shanghai
Since 1981
Business Type :
Manufacturer, Exporter
Main Products :
Copper Nickel Alloy Wire, Electric Resistance Wire, Thermocouple Bare Wire
Total Annual :
8000000-100000000
Employee Number :
90~100
Certification Level :
Verified Supplier
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