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Home > Products > Expansion Alloy Products > Other Expansion Alloy > Sealing Ceramic Vacuum Switch Fe Ni Co Alloy Ceramic - to - Metal

Sealing Ceramic Vacuum Switch Fe Ni Co Alloy Ceramic - to - Metal

Basic Info

Model No.:  4J33

Product Description

Model NO.: 4J33 Material: Fe Ni Co Alloy PCD: No Hole: No Application: Sealing Material for Ceramics Specification: 0.1mm ~ 9.0mm Product Type: Strip Carbon Content: No ET: No Density: 8.27 g/cm3 Trademark: ohmalloy Origin: Shanghai, China Sealing Ceramic Vacuum Switch Fe Ni Co Alloy Ceramic - To - Metal Ohmalloy-4J33 for Sealing and matching ceramics OhmAlloy-4J33 (Expansion alloy)
(Common Name: 33НК, 4J33, KV-4, Ni33Co17) 4J33 alloy has a close Linear expansion coefficient with 95% Al2O3 ceramic in the range of -60 to 600 degrees Celsius. it is an Important sealing structural material in the electric vacuum industry; Mainly used for matching and ceramic sealing. Normal composition%
Ni 32.0~33.6 Fe Bal. Co 14.0~15.2 Si ≤0.3
Mo - Cu - Cr - Mn ≤0.5
C ≤0.05 P ≤0.02 S ≤0.02    
  Typical Physical properties
Density (g/cm3) 8.27
Electrical resistivity at 20ºC(OMmm2/m) 0.46
Thermal conductivity, λ/ W/(m*ºC) 17.6
Curie point Tc/ ºC 440
Elastic Modulus, E/ Gpa 139
The heat treatment process
Stress relief annealing Heating to 470~540ºC. Keep 1~2h, cooling in the air
Annealing Heating to 750~ 900ºC In the medium vacuum
Holding time, h 15min. ~ 1 hour
cooling In the air
  Coefficient of expansion
θ/ºC α1/10-6ºC-1 θ/ºC α1/10-6ºC-1
20~300 6.3 20~400 6.1
20~500 6.9 20~600 8.3
  Typical Mechanical properties
Tensile Strength Elongation
Mpa %
539 32
  Style of supply
Alloys Name Type Dimension  
OhmAlloy-4J33 Wire D= 0.1~8 mm  
OhmAlloy-4J33 Strip W= 5~250 mm T= 0.1 mm
OhmAlloy-4J33 Foil W= 10~100 mm T= 0.01~0.1 mm
OhmAlloy-4J33 Bar Dia= 8~100 mm L= 50~1000 mm
  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 Western union 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.

Contact us if you need more details on 4j33. We are ready to answer your questions on packaging, logistics, certification or any other aspects about Fe Ni Co Alloy、Ohmalloy. If these products fail to match your need, please contact us and we would like to provide relevant information.

Product Categories : Expansion Alloy Products > Other Expansion Alloy

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