C specified CTE alloys - CE alloys
Alloys with a given thermal coefficient of linear expansion (made on the basis of iron and Nickel) подразделяютcz into three groups: group 1 — has the minimum coefficient (<3 • 10-6 K-1), rarely used. Alloy 29NK, 42N, 18ХТФЮ, etc. have an average coefficient (3 • 10-6 to 12 • 10-6 K-1) and high (12 • 10-6 to 27 • 10-6 K-1). They are used mostly for junctions of electrical contacts with glass and ceramics. The third group consists 75GND, 22НХ etc., which are used as active components of the thermostatic bimetallic.
The second group
The percentage «Kovar», 29NK GOST 10994−74
42N marking means that the alloy contains about 42% Nickel.
The percentage 42N GOST 10994−74
|41.5 — 43||≤ 0.1||≤ 0.015||≤ 0.4||≤ 0.3||≤ 0.03||56.14 — 58.5||≤ 0.014|
The third group
The percentage 75GND GOST 10994−74
|≤ 0.8||≤ 0.05||≤ 0.5||71.6 — 76.5||14 — 16||≤ 0.02||≤ 0.03||9.5 — 11||basis|
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