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Electrical materials. Heat-resistant alloys for heating devices. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Electrical materials

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Heat-resistant alloys in addition to high resistivity and low temperature coefficient of resistance, they must have a high operating temperature limit, be well processed and be sufficiently mechanically strong over the entire operating temperature range.

There are currently nine different grades of scale-resistant wrought heat-resistant alloys, which can be classified into chromium and nickel-based alloys called nichromes, and chromium-based heat-resistant alloys.

Properties and purpose of heat-resistant alloys of high ohmic resistance are given in table. 1.33.

Table 1.33. Properties and purpose of heat-resistant alloys of high ohmic resistance

Correction factors for calculating electrical resistance as a function of temperature are given in table. 1.34.

Table 1.34. Correction factors for calculating electrical resistance as a function of temperature

Main characteristics of high resistivity alloys are given in table. 1.35.

Table 1.35. Main characteristics of high resistivity alloys

Thermoelectromotive force of various metals is given in table. 136.

Table 1.36. Thermoelectromotive force of various metals

Note. The values ​​are given at a temperature difference of 100 °C with respect to platinum. The "+" sign indicates that at the soldering point the current is directed from the given metal to the platinum. The difference in values ​​for any pair gives the effective electromotive force.

Approximate values ​​of melting currents of wire from various metals are given in table. 1.37.

Table 1.37. Approximate values ​​of the melting currents of wire from different metals

Note. Wire length 5-10 cm (depending on the diameter).

Author: Koryakin-Chernyak S.L.

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