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4J78 Non-Magnetic Controlled Expansion Alloy
Overview of 4J78 Non-Magnetic Controlled Expansion Alloy
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kovar thermal expansion

The Typical Applications of This Alloy are

  • Non-magnetic sealing parts of electronic device

  • Vacuum seal welding or edge welding of high alumina ceramic materials


Typical Chemical Composition in Percent

Mo

20.0~22.0

Cu

≤1.5

Fe

bal.


Typical Linear Expansion Coefficient

25℃-500℃

12.1~12.7

25℃-600℃12.4~13.0 (α, 10-6-1)


Typical Physical Properties

Magnetic permeability μ16000(μH/m)

≤1.263



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