Kovar, also called 4J29 is a nickel-iron-cobalt alloy containing approximately 29% nickel and 17% cobalt. Its thermal expansion characteristics match those of borosilicate glasses and alumina type ceramics. It is manufactured to a close chemistry range, yielding repeatable properties which make it eminently suitable for glass-to-metal seals in mass production applications, or where reliability is of paramount importance.
Melting point: 1450℃
Ni C S P Mn Si
28.5-29.50.03 max0.02 max0.02 max0.5 max0.3 max
Cr Co Cu Mo Fe
0.2 max16.8-17.80.2 max0.2 maxBasic
Production process of alloy Kovar round bar:
1st melting → 2nd remelting → hot forging → hot rolling → peeling → polishing
Application of alloy Kovar round bar:
· Glass sealing;
· Electron components etc.
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