Shanghai Tankii Alloy Material Co.,Ltd

Shanghai Tankii Alloy Material Co.,Ltd

 

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Home ProductsHigh Temp Alloy

Fe-Ni-Co Kovar High Temp Alloy 4j29 / Nifeco29 Tube / Pipe For Sealing Material

Fe-Ni-Co Kovar High Temp Alloy 4j29 / Nifeco29 Tube / Pipe For Sealing Material

    • Fe-Ni-Co Kovar High Temp Alloy 4j29 / Nifeco29 Tube / Pipe For Sealing Material
    • Fe-Ni-Co Kovar High Temp Alloy 4j29 / Nifeco29 Tube / Pipe For Sealing Material
    • Fe-Ni-Co Kovar High Temp Alloy 4j29 / Nifeco29 Tube / Pipe For Sealing Material
    • Fe-Ni-Co Kovar High Temp Alloy 4j29 / Nifeco29 Tube / Pipe For Sealing Material
  • Fe-Ni-Co Kovar High Temp Alloy 4j29 / Nifeco29 Tube / Pipe For Sealing Material

    Product Details:

    Place of Origin: Shanghai, China,
    Brand Name: TANKII
    Certification: ISO SGS
    Model Number: Kovar

    Payment & Shipping Terms:

    Minimum Order Quantity: Negotiable
    Price: negotiable
    Packaging Details: wooden case / Carton
    Delivery Time: 7-15 work days
    Payment Terms: L/C, T/T, Western Union
    Supply Ability: 1000000 Pcs per Month
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    Detailed Product Description
    Material: Fe-Ni-Co Kovar Alloy Diameter: 1.0mm Min
    Wall Thickness: 0.02mm Min Length: Customized
    Sample: Accepted Surface: Bright / Polished

     

    Kovar-4J29 (Expansion alloy)
    (Common Name: Kovar, Nilo K, KV-1, Dilver Po, Vacon 12) Kovar-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-4J29 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-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 20ºC(Om*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

    Fe-Ni-Co Kovar High Temp Alloy 4j29 / Nifeco29 Tube / Pipe For Sealing Material

     

    Contact Details
    Shanghai Tankii Alloy Material Co.,Ltd

    Contact Person: Matt

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