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Hot Sale High Quality Low Price Kovar Alloy 4J29/29HК/ Vacon 12/Glasseal29-17 Alloy

Description

Inconel 600 is face-centered cubic lattice structure for use at temperature up to 1425°C (2600°F).The Nickel-Chromium alloy is characterized by good corrosion resistance to the reduction, oxidation, Nitric and other media,good stress corrosion cracking resistance,good corrosion resistance of the dry chlorine and chlorine hydride,good mechanical property when below zero, room temperature and high temperature,good anti-creep rupture strength. with the higher chemical stability in water, organic acids and salt solution Usage:so it is widely used in chemical industry, precision machinery, marine engineering, and used as important resistor and thermocouple alloy.

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Hangzhou Ualloy Material Co.,Ltd is one of the best kovar alloy manufacturers and suppliers in China, welcome to buy discount and low price kovar alloy 4j29 wire, kovar alloy 4j29 strip from us, and also welcome to check the price and quotation with our factory.

 

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

OhmAlloy-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 alloy  )

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.

OhmAlloy-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.

OhmAlloy-4J29 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.

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 20℃(ohm*mm2/m)

0.48

Temperature factor of resistivity(20℃~100℃)X10-5/℃

3.7~3.9

Curie point   Tc/ ℃

430

Elastic Modulus,  E/ Gpa

138

 

Coefficient of expansion

The heat treatment process

Annealing for stress relief

Heated to 470~540℃ and hold 1~2 h. Cold down

annealing

In vacuum heated to 750~900℃

Holding time

14 min~1h.

Cooling rate

No more than  10 ℃/min cooled to 200 ℃

Style of supply

Alloys Name

Type

Dimension


OhmAlloy-4J29

Wire

D= 0.1~8mm


OhmAlloy-4J29

Strip

W= 5~250mm

T= 0.1mm

OhmAlloy-4J29

Foil

W= 10~100mm

T= 0.01~0.1

OhmAlloy-4J29

Bar

Dia= 8~100mm

L= 50~1000



                  

 

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