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4j29 Kovar Controlled Expansion Alloy Wire for Glass Sealing Alloy

China 4j29 Kovar Controlled Expansion Alloy Wire for Glass Sealing Alloy, Find details about China Invar 29 Wire, Kovar Alloy from 4j29 Kovar Controlled Expansion Alloy Wire for Glass Sealing Alloy

Model NO.
4j29
Material
Fe- Ni Alloy
Surface
Smooth and Bright
Condition
Soft
Density
8.1
Resisivity
0.78
Curie Point
230
Chemical Composition
Feni36
Grade
4j36/ Uns K93600/ AISI/ASTM Invar36/W. Nr 1.3912
Thermal Conductivity
11
Elastic Modulus
144
Trademark
HUONA
Transport Package
Wooden Case
Specification
1.5x200
Origin
Shanghai, China
HS Code
7505120000
Model NO.
4j29
Material
Fe- Ni Alloy
Surface
Smooth and Bright
Condition
Soft
Density
8.1
Resisivity
0.78
Curie Point
230
Chemical Composition
Feni36
Grade
4j36/ Uns K93600/ AISI/ASTM Invar36/W. Nr 1.3912
Thermal Conductivity
11
Elastic Modulus
144
Trademark
HUONA
Transport Package
Wooden Case
Specification
1.5x200
Origin
Shanghai, China
HS Code
7505120000

4j29 Kovar Controlled Expansion Alloy Wire for Glass Sealing Alloy


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

Controlled Expansion and Glass Sealing Alloys
German standard number Tradename DIN UNS
1.3912Alloy 3617745K93600/93601
1.3917 Alloy 42 17745K94100
1.3922 Alloy 4817745 K94800
1.3981Pernifer2918 17745 K94610
2.4478 NiFe 4717745 N14052
2.4486 NiFe47Cr17745-

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  

alloyCMnSiPSNiCrCoCuMoFe
4J29≤0.03≤0.50≤0.30≤0.020≤0.02028.5~29.5≤0.2016.8~17.8≤0.2≤0.2balance

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 20ºC(OMmm2/m)0.48
Temperature factor of resistivity(20ºC~100ºC)X10-5/ºC3.7~3.9
Curie point Tc/ ºC430
Elastic Modulus, E/ Gpa138

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

Coefficient of expansion

θ/ºCα1/10-6ºC-1θ/ºCα1/10-6ºC-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/ºC100200300400500
λ/ W/(m*ºC)20.621.522.723.725.4

Style of supply

Alloys NameTypeDimension 
4J29WireD= 0.1~8mm 
4J29StripW= 5~250mmT= 0.1mm
4J29FoilW= 10~100mmT= 0.01~0.1mm
4J29BarDia= 8~100mm

L= 50~1000mm

4j29 Kovar Controlled Expansion Alloy Wire for Glass Sealing Alloy
4j29 Kovar Controlled Expansion Alloy Wire for Glass Sealing Alloy
4j29 Kovar Controlled Expansion Alloy Wire for Glass Sealing Alloy
4j29 Kovar Controlled Expansion Alloy Wire for Glass Sealing Alloy
4j29 Kovar Controlled Expansion Alloy Wire for Glass Sealing Alloy
4j29 Kovar Controlled Expansion Alloy Wire for Glass Sealing Alloy
4j29 Kovar Controlled Expansion Alloy Wire for Glass Sealing Alloy
4j29 Kovar Controlled Expansion Alloy Wire for Glass Sealing Alloy
4j29 Kovar Controlled Expansion Alloy Wire for Glass Sealing Alloy


FAQ 
1. How long i can get the feedback after we sent the enquiry?
A: We will reply you within 12 hours in working day.

2. How can I get some samples?
A: We are pleased to offer you sample, the delivery time is about 4-7 days.

3. Are you a factory?
A: Yes. We are. We have specialized in this field over 10 Year.

4. What is the delivery time?
A:15 days normally, detail delivery date should be decided according to production season and order quantity.


 

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