29HK 10X1.0mm Expansion Alloy Kovar Tube

Product Details
Customization: Available
Product Type: Bar,Wire
Material: Nicr
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Number of Employees
15
Year of Establishment
2012-02-06
  • 29HK 10X1.0mm Expansion Alloy Kovar Tube
  • 29HK 10X1.0mm Expansion Alloy Kovar Tube
  • 29HK 10X1.0mm Expansion Alloy Kovar Tube
  • 29HK 10X1.0mm Expansion Alloy Kovar Tube
  • 29HK 10X1.0mm Expansion Alloy Kovar Tube
  • 29HK 10X1.0mm Expansion Alloy Kovar Tube
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Basic Info.

Condition
Annealed Polished
Surface
Bright
Packing
Wooden Case
Density
8.4G/M3
Size
Customized
Transport Package
Wooden Case
Specification
customized
Trademark
Ualloy
Origin
China
Production Capacity
300t/Year

Packaging & Delivery

Package Size
50.00cm * 50.00cm * 40.00cm
Package Gross Weight
50.000kg

Product Description

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

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 20ºC(OHM*mm2/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

 

 

 

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

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

Style of supply


Alloys Name

Type

Dimension

 

Ualloy-4J29

Wire

D= 0.1~8mm

 

Ualloy-4J29

Strip

W= 5~250mm

T= 0.1mm

Ualloy-4J29

Foil

W= 10~100mm

T= 0.01~0.1

Ualloy-4J29

Bar

Dia= 8~100mm

L= 50~1000

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