GLASS SEALING ALLOYS NICKEL IRON

Alloy 42: Its quite low and constant expansion factor up to 300 C allows its use in high temperature thermostats, for example:gas and electric stoves. Alloy 48:This alloy is with a nominal composition of 48% nickel, balance - iron having a coefficient of expansion approximately equal to that of soft glasses of the soda-lime and lead-oxide types. For this reason,their application covers a very wide field in the manufacture of electric lamps,radio valves and electronic equipment. Alloy 52: Particularly suitable for soft glasses, has its most important application in reed switches and in electronic components (transistors).Because of its low dispersion it can be used for high frequency relays. NiFeCo 29/18: This 29% nickel-iron alloy, modified by the addition of 17% cobalt,has a very low coefficient of expansion matching very closely the medium-hard, boro-silicate glasses. It is widely used in the manufacture of high power radio transmission valves, X-ray tubes and many types of electronic equipment. In addition,it is suitable for use with ceramic materials, e.g. in transformer seals where ceramics are employed.

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