Elinvar
Elinvar is an alloy of iron , nickel and chrome , which is used for the balance wheel in pocket and wrist watches .
Elinvar was developed in 1919 by Charles Édouard Guillaume as the successor to Invar with a composition (by mass ) of 59% iron, 36% nickel and 5% chromium . The name is made up of the French terms El asticité and invar iable .
Today Elinvar is a collective term for nickel-steel alloys whose " thermoelastic coefficient " is practically zero within the temperatures to which watches are exposed (−10 to +30 ° C).
The Elinvar alloys may according to their composition and magnetization in ferromagnetic (iron or cobalt -based), antiferromagnetic ( manganese - or chromium-based), non-magnetic ( niobium - or palladium -based) and amorphous Elinvar alloys are divided.
Individual evidence
- ^ Helmut Kahlert , Richard Mühe , Gisbert L. Brunner : Wristwatches: 100 years of development history. Callwey, Munich 1983; 5th edition ibid. 1996, ISBN 3-7667-1241-1 , p. 37 f.
- ^ Charles Édouard Guillaume . In: Encyclopædia Britannica. Retrieved January 10, 2012
- ^ GA Berner: Illustrated specialist lexicon of watchmaking . Retrieved January 10, 2012
- ↑ Elinvar alloys ( page no longer available , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice. . In: Springer Materials. The Landolt-Börnstein Database. Retrieved January 10, 2012
