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Precision Alloys

#1
Kovar alloy 4J29
Chemical Composition Wt.%No.Chemical composition (mass fraction) (%)
4J29CMnSiPSCuCrMoNiCoFe
≤0.03≤0.50≤0.30≤0.020≤0.020≤0.20≤0.20≤0.2028.5~
29.516.8~
17.8bal
Brief Introduction4J29 alloy, also known as Kovar alloy. The alloy has similar linear expansion coefficient to silicon-boron-hard glass at 20-450 ℃, high Curie point and good low-temperature tissue stability. Alloy oxide film is dense, can be well infiltrated by the glass. And does not interact with mercury, suitable for use in mercury-containing discharge meters. Electric vacuum device is the main structure of the sealing material.Precision Alloys
website:http://www.718alloy.com/precision-alloys/
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