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Vacuum Furnace Nickel Based Alloys For Glass - To - Metal Seal Vacuum Switch Tube

Categories Precision Alloys
Brand Name: OHMALLOY
Model Number: 4J29
Certification: SGS, ISO
Place of Origin: China(Shanghai)
MOQ: 30 KG
Price: negotiable
Payment Terms: L/C, D/A, D/P, T/T,
Supply Ability: 25000 KG per month
Delivery Time: 25-35 working days
Packaging Details: Spool + Waterproof paper + Wooden case
Material: Fe Ni alloy
Condition: Soft
Wire diameter range: 0.1mm ~ 9.0mm
Package: Spool, Coil, Wooden case
Surface: Bright
Density: 8.2 g/cm3
Application: Sealing material for glass
Annealing Treatment: In Vacuum Furnace
Elongation: more than 25%
Temperature factor of resistivity(20℃~100℃)X10-5/℃: 3.7~3.9
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    Vacuum Furnace Nickel Based Alloys For Glass - To - Metal Seal Vacuum Switch Tube

    Vacuum Furnace Nickel Based Alloys For Glass - To - Metal Seal Vacuum Switch Tube

    Sealing glass elements of Vacuum switch tube


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


    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-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.


    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.


    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.


    Style of supply


    Alloys NameTypeDimension
    OhmAlloy-4J29WireD= 0.1~8mm
    OhmAlloy-4J29StripW= 5~250mmT= 0.1mm
    OhmAlloy-4J29FoilW= 10~100mmT= 0.01~0.1mm
    OhmAlloy-4J29BarDia= 8~100mmL= 50~1000mm

    Normal composition%

    Ni28.5~29.5FeBal.Co16.8~17.8Si≤0.3
    Mo≤0.2Cu≤0.2Cr≤0.2Mn≤0.5
    C≤0.03P≤0.02S≤0.02

    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 20(Ωmm2/m)0.48
    Temperature factor of resistivity(20~100)X10-5/3.7~3.9
    Curie point Tc/ 430
    Elastic Modulus, E/ Gpa138


    The heat treatment process

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

    Coefficient of expansion

    θ/℃α1/10-6-1θ/℃α1/10-6-1
    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/℃100200300400500
    λ/ W/(m*℃)20.621.522.723.725.4


    FAQ

    1. What's the minimum quantity customer can order?
    If we have your size in stock, we can provide any quantity you want.
    If we do not have, for spool wire, we can produce 1 spool, about 2-3kg. For coil wire, 25kg.


    2. How can you pay for small sample amount?
    We have account, wire transfer for sample amount also ok.

    3. Customer do not have express account. How will us arrange the delivery for sample order?
    Just need to provide your address information, we will check the express cost, you can arrange the express cost together with sample value.

    4. What's our payment terms?
    We can accept LC T/T payment terms, it also depending on delivery and total amount. Let's talk more in details after getting your detailed requirements.

    5. Do you provide free samples?
    If you want several meters and we have stock of your size, we can provide, customer need to bear the International express cost.

    6. What's our working time?
    We will give you reply through email/phone Online contact tool within 24 hours. No matter working day or holidays.

    Sales Manager:Michaeal Qiu.

    What's App:+86 13795230939

    Tel:+86-21-66796338 Mobile Phone: +86 13795230939

    Product Tags:

    nickel iron alloy

      

    fe ni alloy

      
    Quality Vacuum Furnace Nickel Based Alloys For Glass - To - Metal Seal Vacuum Switch Tube for sale
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