Kovar Alloy (4J29)

Kovar Alloy (4J29)

Model No.:

W.Nr.1.981;Nilo-k;UNS K94610(FeNi29Co17),Chinese 4J29

Introduction:

Available Shapes: Bar,Pipe,Wire,Strip,Plate,Fasteners,fittings

Product Detail

Product Tags

Kovar Alloy  is Glass sealed and controlled expansion alloys  provided in a variety of forms to facilitate efficient manufacturing of various metal parts. It has thermal expansion characteristics matching those of hard glass. Used for matched expansion joints between metals and glass or ceramics.

Kovar alloy is a vacuum melted, iron-nickel-cobalt, low expansion alloy whose chemical composition is controlled within narrow limits to assure precise uniform thermal expansion properties. Extensive quality controls are employed in the manufacture of this alloy to ensure uniform physical and mechanical properties for ease in deep drawing, stamping and machining.

Kovar Alloy Trade Name: W.Nr.1.981;Nilo-k;UNS K94610(FeNi29Co17),Chinese 4J29

Kovar Alloy Chemical composition:

Alloy

%

Ni

Co

Fe

MoCu

C

Mn

Si

P

S

4J29

Min.

28.5

16.8

Balance








Max.

29.5

17.8

0.20.2

0.03

0.5

0.3

0.02

0.02

Kovar Alloy Physical properties:

Density

8.3 g/cm3

Melting point

1415-1450 ℃

Kovar Alloy tensile strength of wire in line with the provisions 

Status code

State

Tensile strength,N/mm2

R

1/4I

1/2I

3/4I

I

Soft state

1/4 Hard state

1/2 Hard state

3/4 Hard state

Hard state

<585

585-725

655-795

725-860

>860

Kovar Strip tensile strength in line with the provisions

Status code

State

Tensile strength,N/mm2

R

1/4I

1/2I

3/4I

I

Soft state

1/4 Hard state

1/2 Hard state

3/4 Hard state

Hard state

                     <570

                     520-630

                     590-700

                     600-770

                      >700

Kovar Alloy average linear expansion coefficient in line     

Alloy Grades

Specimen heat treatment system

The average linear expansion coefficient α,10-6/ oC

 Kovar

In hydrogen atmosphere heated to 900 ± 20 oC, insulation 1h, and then heated to 1100 ± 20 oC, insulation 15min, to not more than 5 oC / min rate of cooling to below 200 oC released

20-300 oC

20-400 oC

20-450 oC

 

—–

 

4.6-5.2

 

5.1-5.5

Kovar Alloy typical expansion coefficient    

Alloy Grades

The average linear expansion coefficient a,10-6/ oC

Kovar

20-200

oC

20-300

 oC

20-400

oC

20-450

oC

20-500

oC

20-600

oC

20-700

oC

20-800

oC

5.9

5.3

5.1

5.3

6.2

7.8

9.2

10.2

Kovar Alloy Specificaiton:

RodWireFrogingPipeSheetStrip

     

    ASTM F15;DIN 17745;S.E.W.385;Werkstoff Nr.1.3981;AFOR NF A54-301

         

Kovar Alloy Applications Fileds:                    

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

  • Previous:
  • Next:
  • RELATED PRODUCTS

    INQUIRY DETAILS *

    INQUIRY DETAILS
    • captcha