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Alloy 25НЮ

Designation

Name The value
Designation GOST Cyrillic 25НЮ
Designation GOST Latin 25HJu
Transliteration 25NYu
The chemical elements 25NiAl

Description

Alloy 25НЮ used: for the manufacture of cast (with subsequent grinding) permanent magnets mass production (due to otsutstvie scarce and expensive cobalt).

Standards

Name Code Standards
Sheets and stripes В33 TU 14-1-157-72

Chemical composition

Standard C Mn Si Ni Fe Al Nb
TU 14-1-157-72 ≤0.05 ≤0.6 ≤0.4 24.5-25.5 The rest 8.4-9.6 3.7-4.2
Fe is the basis.

Technological properties

Name The value
Features of production The main drawbacks of alloy: high hardness, brittleness and poor workability, so the magnets of them have cast manufacturing and processing by grinding. Alloy not processed by cutting, not drilled. Products accurate dimensions, due to brittleness and hardness, allowing processing only by grinding to produce almost impossible. Fine products made by powder metallurgy methods, obtaining sintered magnets by compaction of the powder composed of the crushed particulate alloy, and further sintering at high temperatures by analogy with the processes of ceramics. Pressed parts sintered in a tubular electric furnace at a temperature 1280-1290 °C (delay 2-3 hours), cooled in running water. Sintering is produced in the environment of the reducing gas of hydrogen or dissociated ammonia.

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