4J29/Kovar/29IK18A

Cat No:HPA-0002

Description

4J29 (Kovar / 29IK18A) is a Fe-Ni-Co controlled-expansion alloy whose thermal expansion coefficient closely matches that of hard glass and ceramics. It is widely used for glass-to-metal seals, ceramic-to-metal seals, vacuum tubes, semiconductor packages and aerospace electronic components.

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Basic Information

Composition	Ni 28.5-29.5%; Co 16.8-17.8%; Fe balance; C ≤ 0.03%; Si ≤ 0.30%; Mn ≤ 0.50%; P ≤ 0.020%; S ≤ 0.020%; Cr ≤ 0.20%; Cu ≤ 0.20%; Mo ≤ 0.20%; Al ≤ 0.10%; Ti ≤ 0.10%; V ≤ 0.10%; W ≤ 0.10%; Nb ≤ 0.10%; N ≤ 0.10%
Density	8.25 g/cm³
Curie Temperature	430 °C

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