FeNi Glass Sealing Alloy

Alloy 42 (Nilo 42)

Iron nickel alloy with constant expansion has a certain coefficient of hot wire expansion in a certain range. It is mainly used for matching sealing with soft glass or corresponding ceramics in electric vacuum industry.

Equivalent Grades

GBГОСТASTMUNSDINW.Nr.NFBSJISSS
4J4242НGlass Sealing 42
Uniseal 42
K94100Vacodil 42
Nilo 42
1.3917Dumet 42Nilo 42NSD
4J45 Niromet 46
Ferrovac 46 Ni
 Vacodil 46  Nilo 45  
4J5050НFeNi 50 Vacodil 500 N50 NS-1 
4J5252НGlass Sealing 52 Vacodil 520
FeNi52
 N52Nilo 51N52 
4J54  Vacodil 540
FeNi54
     

Chemical Composition, %

AlloyCMnSiPSNiFe
4J42≤0.05≤0.8≤0.3≤0.02≤0.0241.5-42.5Rest
4J45≤0.05≤0.8≤0.3≤0.02≤0.0244.5-45.5Rest
4J50≤0.05≤0.8≤0.3≤0.02≤0.0249.5-50.5Rest
4J52≤0.05≤0.6≤0.3≤0.02≤0.0251.5-52.5Rest
4J54≤0.05≤0.6≤0.3≤0.02≤0.0253.5-54.5Rest

Average Linear Expansion Coefficient

AlloyHeat treatment for sampleAverage linear expansion coefficient a/10-6.K-1
20~300℃20~400℃20~500℃
4J42Heating to temperature between 900℃±20℃ in a protective or vacuum atmosphere. Holding for 1hour, cooling to 200℃ at a rate less than 5℃ per min, then air cooling4.0~5.06.5~7.5
4J456.5~7.26.5~7.2
4J509.2~10.09.2~9.9
4J529.8~11.09.8~11.0
4J5410.2~11.410.2~11.4

Features

FeNi Glass Sealing Alloys take on a constant linear expansion coefficient under a certain range of temperature.

Applications

They are mainly used for match sealing soft glass in ceramic.