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Vacon 12 Fe-Ni-Co Glass Sealing Alloy Wire Kovar Alloy Wire

Short Description:

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


  • Model NO.: Kovar
  • OEM: Yes
  • State: Soft 1/2hard hard T-hard
  • HS Code: 74099000
  • Origin: China
  • Product Detail

    FAQ

    Product Tags

    Vacon 12 Fe-Ni-Co Glass Sealing Alloy Wire  Kovar Alloy Wire
    (Common Name: Kovar, Nilo K, KV-1, Dilver PoVacon 12)

    Specification: Sheet/Plate, Bar/Rod/Wire/Coil,Capillary/Pipe/Tube

    Size Range: 

    —*Sheet_Thickness 0.1mm~40.0mm, width:≤300mm,Condition: cold rolled(hot), bright, bright annealed

    —*Round Wire_Dia 0.1mm~Dia 5.0mm,Condition: cold drawn, bright, bright annealed

    —*Flat Wire_Dia 0.5mm~Dia 5.0mm,length:≤1000mm,Condition:flat rolled, bright annealed

    —*Bar_Dia 5.0mm~Dia 8.0mm,length:≤2000mm,Condition:cold drawn,bright, bright annealed
    Dia 8.0mm~Dia 32.0mm,length:≤2500mm,Condition:hot rolled,bright, bright annealed
    Dia 32.0mm~Dia 180.0mm,length:≤1300mm,Condition:hot forging,peeled, turned, hot treated

    —*Capillary_OD 8.0mm~1.0mm,ID 0.1mm~8.0mm,length:≤2500mm,Condition: cold drawn, bright, bright annealed

    —*Pipe_OD 120mm~8.0mm,ID 8.0mm~129mm,length:≤4000mm,Condition: cold drawn, bright, bright annealed

    Application:
    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(Ωmm2/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






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