Alperm: Difference between revisions
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'''Alperm''' (also '''alfenol''' or '''alfer''') - a class of [[alloy]]s comprising 83-90% of [[iron]] and 10-17% of [[aluminium]]. The most widely used composition is with 16% Al.<ref>[http://ir.library.tohoku.ac.jp/re/bitstream/10097/27088/1/KJ00004196996.pdf Effect of Aging on the Maximum Permeability in Quenched Fe-Al Alloys (Alperm) ]</ref> |
'''Alperm''' (also '''alfenol''' or '''alfer''') - a class of [[alloy]]s comprising 83-90% of [[iron]] and 10-17% of [[aluminium]]. The most widely used composition is with 16% Al.<ref>[http://ir.library.tohoku.ac.jp/re/bitstream/10097/27088/1/KJ00004196996.pdf Effect of Aging on the Maximum Permeability in Quenched Fe-Al Alloys (Alperm) ]</ref> |
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An alloy with 13% Al is also sometimes referred to as '''alfer'''. It exhibits large [[magnetostriction]] and it is used in magnetoelastic sensors. |
An alloy with 13% Al is also sometimes referred to as '''alfer'''. It exhibits large [[magnetostriction]] and it is used in magnetoelastic sensors. |
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Alperm is [[Soft magnetic material|magnetically soft]] and exhibits high [[magnetic permeability]] |
Alperm is [[Soft magnetic material|magnetically soft]] and exhibits high [[magnetic permeability]]. The material can be produced in 0.5 mm thick sheets as well as 50-60 μm thick [[amorphous]] ribbons<ref>[http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TJJ-46DFRJX-22&_user=10&_coverDate=02%2F29%2F1984&_rdoc=1&_fmt=high&_orig=search&_sort=d&_docanchor=&view=c&_searchStrId=1284872796&_rerunOrigin=google&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=db97e464bf0eaf696fb534be0dbce3d3 Magnetic properties of rapidly quenched alperm ribbons]</ref>. |
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The [[coercivity]] is usually below 5 A/m (for alfer it is around 50 A/m) and permeability 55 000 (for alfer 4000). Saturation flux density is 0.8 T (for alfer 1.28 T). |
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The addition of Al increases electrical [[resistivity]] of alloy up to 140 μΩm, which is almost four times the value in commonly used 3% SiFe [[electrical steel]]. For this reason alperm can be used in higher frequency range. However, because of the Al content the material is more susceptible to [[oxidation]]. |
The addition of Al increases electrical [[resistivity]] of alloy up to 140 μΩm, which is almost four times the value in commonly used 3% SiFe [[electrical steel]]. For this reason alperm can be used in higher frequency range. However, because of the Al content the material is more susceptible to [[oxidation]]. |
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The alloy was discovered by [[Japan]]ese researchers H. Masumoto and Hideo Saito in 1939. |
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== References == |
== References == |
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Revision as of 13:05, 7 April 2010
Alperm (also alfenol or alfer) - a class of alloys comprising 83-90% of iron and 10-17% of aluminium. The most widely used composition is with 16% Al.[1]
An alloy with 13% Al is also sometimes referred to as alfer. It exhibits large magnetostriction and it is used in magnetoelastic sensors.
Alperm is magnetically soft and exhibits high magnetic permeability. The material can be produced in 0.5 mm thick sheets as well as 50-60 μm thick amorphous ribbons[2].
The coercivity is usually below 5 A/m (for alfer it is around 50 A/m) and permeability 55 000 (for alfer 4000). Saturation flux density is 0.8 T (for alfer 1.28 T).
The addition of Al increases electrical resistivity of alloy up to 140 μΩm, which is almost four times the value in commonly used 3% SiFe electrical steel. For this reason alperm can be used in higher frequency range. However, because of the Al content the material is more susceptible to oxidation.
The alloy was discovered by Japanese researchers H. Masumoto and Hideo Saito in 1939.