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ALNICO MAGNET
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What's Alnico
Alnico Magnets derive their name from main constituents - Aluminum, Nickel and Cobalt with Iron as base.
Alnico Magnets
Alnico Magnets can be made by both cast and sintered processes. Alnico Magnets have distinct advantages over other varieties of permanent magnets in terms of moderate prices & widest temperature stability. Alnico is very hard and brittle. Machining or drilling can not therefore be accomplished by ordinary methods. Holes are usually cored in at the foundry. Magnets are cast or sintered as closely as possible to required size so that abrasive grinding to finish dimensions and tolerances is minimized.
DIMENSION
- Standard and Customized
Applications of Alnico Magnets
Speakers, Microphones, Telephones, Micro Motors, Relays, Measuring Instruments (Volt Amp, Speed-Meter, Watt-Hour -Meter), Flywheel Generators (Motor-Cycles, Farming Machine), Separators, Sensors, Holding Devices, Controls, Braking Devices, Security Systems , Toys, Etc. |
| Demagnetising and Energy Product Curve
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Cast Alnico
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Charge preparation (raw ingrediants like Al, Ni, Co, Fe mixed in desired proportion) |
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Melting (charge melted in induction furnace at high temperature) |
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Pouring (molten charge poured into stacks of sand moulds to prepare cast magnets) |
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Cooling (stacks of cast magnets cooled to room temperature) |
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Stack breaking (stacks of cast magnets segregated into individual magnets and feed metal) |
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Cleaning (cast magnets cleaned by shot blasting and sly barreling) |
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Snagging (magnets rough ground to remove flash/surface defects) |
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Heat treatment and Grinding (magnets heat - treated and ground to get close tolerance finish and correct warppage) |
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Inspection magnets inspected for physical and magnetic properties |
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Anti rust treatment (magnets coated with anti rust oil) |
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Packing and Dispatch (magnets packed in cartons and dispatched) |
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Sintered Alnico
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Powder preparation (raw ingredients like Al, Ni, Co, Fe mixed to form a fine homogenized powder) |
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Pressing (powder pressed into desired shape in a die) |
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Sintering (pressed magnets sintered in hydrogen atmosphere at high temperature) |
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Heat Treatment and Grinding (magnets heat-treated and ground to get close tolerance finish and correct wrappage) |
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Inspection (magnets inspected for physical and magnetic properties) |
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Packing and Dispatch (magnets packed in cartons and dispatched) |
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MAGNETIC PROPERTIES
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Cast AlNiCo
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Material
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Equivalent MMPA Class
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Br
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Hcj
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BHmax
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Den-sity
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Temperature Coefficient
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Curie
Tempe
-rature Tc
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Working Tempe
-rature Tw
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mT
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Gs
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KA/m
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Oe
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KJ/m3
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MGOe
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g/cm3
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Near Br %/°C
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Near Hci %/°C
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°C
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°C
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LN9
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AlNiCo 3
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680
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6800
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30
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380
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9.0
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1.13
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6.9
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-0.03
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-0.02
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810
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450
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LN10
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600
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6000
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40
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500
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10.0
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1.20
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6.9
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-0.03
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-0.02
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810
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450
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LNG12
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AlNiCo 2
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720
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7200
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45
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500
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12.4
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1.55
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7.0
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-0.03
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-0.02
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810
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450
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LNG13
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700
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7000
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48
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600
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12.8
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1.6
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7.0
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-0.03
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-0.02
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810
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450
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LNG37
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AlNiCo5
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1200
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12000
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48
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600
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37.0
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4.65
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7.3
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-0.02
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+0.02
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860
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525
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LNG40
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1250
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12500
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48
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600
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40.0
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5.00
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7.3
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-0.02
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+0.02
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860
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525
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LNG44
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1250
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12500
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52
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650
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44.0
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5.50
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7.3
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-0.02
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+0.02
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860
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525
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LNG52
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AlNiCo 5DG
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1300
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13000
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56
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700
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52.0
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6.50
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7.3
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-0.02
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+0.02
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860
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525
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LNG60
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AlNiCo 5-7
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1350
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13500
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59
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740
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60.0
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7.5
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7.3
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-0.02
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+0.02
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860
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525
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LNGT28
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AlNiCo 6
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1000
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10000
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58
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720
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28.0
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3.50
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7.3
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-0.02
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+0.03
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860
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525
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LNGT36J
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AlNiCo 8HC
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700
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7000
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140
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1750
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36.0
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4.50
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7.3
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-0.025
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+0.02
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860
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550
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LNGT18
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AlNiCo 8
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580
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5800
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100
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1250
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18.0
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2.2
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7.3
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-0.025
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+0.02
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860
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550
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LNGT32
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AlNiCo 8
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800
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8000
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100
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1250
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32.0
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4.0
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7.3
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-0.025
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+0.02
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860
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550
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LNGT40
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800
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8000
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110
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1380
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40.0
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5.0
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7.3
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-0.025
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+0.02
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860
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550
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LNGT60
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AlNiCo 9
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900
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9000
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110
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1380
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60.0
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7.50
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7.3
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-0.025
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+0.02
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860
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550
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LNGT72
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1050
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10500
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112
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1400
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72.0
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9.00
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7.3
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-0.025
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+0.02
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860
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550
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Sintered AlNiCo
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Grade
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Br
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Hcj
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Hcb
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(BH)max
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Density
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Temperature
Codfficient %
Change °C
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Curie
TemperatureTc
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Remark
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mT
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Gs
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KA/m
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Oe
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KA/m
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Oe
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KJ/m3
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MGOe
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g/cm3
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%/K
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°C
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FLN8
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520
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5200
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43
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540
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40
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500
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8-10
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1.0-1.25
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6.8
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-0.022
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760
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760
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FLNG12
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700
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7000
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43
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540
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40
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500
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12-14
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1.5-1.75
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7.0
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-0.014
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810
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FLNGT14
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570
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5700
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78
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980
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76
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950
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14-16
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1.75-2.0
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7.1
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-0.020
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850
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FLNGT18
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560
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5600
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90
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1130
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88
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1100
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18-22
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2.25-2.75
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7.2
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-0.020
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850
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FLNG28
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1050
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10500
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47
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590
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46
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580
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28-33
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3.5-4.15
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7.2
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-0.016
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850
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Anisotropy
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FLNG34
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1100
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11000
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51
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640
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50
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630
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34-38
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4.3-4.8
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7.2
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-0.016
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890
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FLNGT28
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1000
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10000
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57
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710
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56
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700
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28-30
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3.5-3.8
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7.2
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-0.020
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850
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FLNGT31
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780
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7800
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106
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1130
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104
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1300
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33-36
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3.9-4.5
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7.2
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-0.020
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850
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FLNG33J
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650
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6500
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150
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1880
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136
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1700
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31-36
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4.15-4.5
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7.2
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-0.020
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850
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FLNGT38
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800
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8000
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126
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1580
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123
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1550
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38-42
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4.75-5.3
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7.2
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-0.020
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850
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FLNGT42
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880
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8800
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122
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1530
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120
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1500
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42-48
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5.3-6.0
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7.25
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-0.020
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850
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Conversion Table
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Quantity
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Unit C.G.S.
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Unit S.I.
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*(S.I.)/(C.G.S.)ratio
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Magnetic flux (Ø)
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maxwell
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weber, WB
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108
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Flux Density B
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gauss, G
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tesla, T=Wb/m2
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104
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Permeability of space (µo)
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unity
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henry/meter,H/m
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102/(4π)
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Intensity of Magnetisation (J)
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e.m.u.=G/(4)
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tesla, T=N/Am
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104/(4π)
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Magnetic field strength (H)
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108Oersted, Oe
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ampere/meter,A/m
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(4π)/103
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Maximum energy product (BHmax)
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MGOe
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KJ/m3
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(4π)/102
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