12-5 Technology Drive

Setauket, NY 11733

Tel: 888-240-3606 / 631-246-6142

Fax: 631-246-6163

Email: sales@technomag.net

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Alnico Magnets

Cast Alnico Magnets

Cast Alnico magnets, which are aluminum nickel-cobalt-iron alloys, are the most established and widely used permanent magnet materials. Because of their high flux density and superior temperature stability, cast magnets have been accepted in the widest range of application.

  • High hardness cast magnets are machined mainly by grinding.
  • Low temperature coefficient. Usable at relatively high ambient temperature with a minimum of Irreversible demagnetization.
  • Effective usage of magnetic properties due to this materials ability to be magnetized after assembly in the magnetic circuit
  • An extremely compact magnetic circuit is obtainable using high energy cast magnets with optimized structures
cast alnico magnet cast alnico magnet 2

Applications

  • Speakers, microphones, telephones Micromotors
  • Measuring instruments (Volt, Amp, speed–meter, watt-hour-meter)
  • Flywheel generators (motor-cycles, farming machine)
  • Others (Alarm devices, toys, etc.)
  • Conversion magnets for TV or PC
  • Reed Switches
  • Relays
  • Guitar Pickups
  • Actuators
cast alnico magnet 3

Physical Properties of Cast Alnico Magnets

Curie Point 850~890°C     Hardness HRC 45~60
Max. Permissible Temp. 550°C     Thermal Expansion Coefficient 11~13.5 X 1O-6/°C
Specific Resistivity 50~75μW-cm     Temperature Coefficient ~0.016%/°C
Density ~7.3g/cm³    
       
Standard Rating Characteristics of Cast Alnico Magnets
Techno
Mag
Code
Residual flux density Coercive force Maximum energy product
Br Hc (BH) Max.
KG T Oe KA/m MG • Oe KJ/m³
TM-1B 12.5-13.0 1.25-1.30 600-660 47.7-52.5 4.8-5.5 38.2-43.8
TM-1D 12.8-13.2 1.28-1.32 650-700 51.7-55.7 5.3-6.2 42.2-49.3
TM-1L 11.8-12.4 1.18-1.24 570-620 45.4-49.3 4.5-5.2 35.8-41.4
HIMAG 13.0-14.0 1.30-1.40 700-800 55.7-63.7 6.5-8.0 51.7-63.7
TM-2B 10.0-11.0 1.00-1.10 700-780 55.7-62.1 3.5-4.2 27.8-33.4
TM-2C 11.0-11.8 1.10-1.18 680-750 54.1-60.0 4.0-4.5 31.8-35.8
TM-4A 6.0-7.0 0.60-0.70 550-620 43.7-49.3 1.3-1.6 10.3-12.7
TM-4B 6.0-7.0 0.60-0.70 500-550 39.8-43.7 1.3-1.5 10.3-11.9
TM-4C 5.0-6.0 0.50-0.60 650-750 51.7-60.0 1.3-1.7 10.3-13.5
TM-4D 5.6-6.5 0.56-0.65 1000-1150 79.6-91.5 1.6-2.0 12.7-15.9
TM-5AB 8.0-9.5 0.80-0.95 130-190 10.3-15.1 - -
TM-8B 8.3-9.0 0.83-0.90 1380-1550 110-123 4.8-5.4 38.2-43.0
TM-8C 8.5-9.0 0.85-0.90 1500-1650 119-131 5.0-6.5 39.8-51.7
TM-8E 7.5-8.5 0.75-0.85 1800-2100 143-167 5.5-7.0 43.8-55.7
TM-9B 10.0-11.0 1.00-1.10 1500-1600 119-127 9.0-11.0 71.6-87.5

Sintered Alnico Magnets

Sintered Alnico magnets are usually restricted to smaller sizes, it has slightly lower magnetic properties, but better mechanical strength than cast alnico magnets. Sintered Alnico magnets are widely used in all kinds of sensors, meters, controller speedometer and other applications. These magnets have generally the same properties as cast magnets, with the following special characteristics.

  • High magnetic characteristics.
  • Small size and complex shapes are possible
  • Superb mechanical strength
sintered alnico magnet

Applications

  • Measuring Instruments
  • Sensors
  • Level Meter
  • Panel Meter
  • Reed Switches
  • Relays
  • Guitar Pickups
  • Actuators
cast alnico magnet

Physical Properties of Sintered Alnico Magnets

Curie Point 850~890°C     Hardness HRC 45~60
Max. Permissible Temp. 550°C     Thermal Expansion Coefficient 11~13.5 X 1O-6/°C
Specific Resistivity 50~75μ W-cm     Temperature Coefficient ~0.016%/°C
Density ~7.3g/cm³    
       
Standard Rating Characteristics of Cast Alnico Magnets
Techno
Mag
Code
Residual flux density Coercive force Maximum energy product
Br Hc (BH) Max.
KG T Oe KA/m MG • Oe KJ/m³
TM-1B 12.5-13.0 1.25-1.30 600-660 47.7-52.5 4.8-5.5 38.2-43.8
TM-1D 12.8-13.2 1.28-1.32 650-700 51.7-55.7 5.3-6.2 42.2-49.3
TM-1L 11.8-12.4 1.18-1.24 570-620 45.4-49.3 4.5-5.2 35.8-41.4
HIMAG 13.0-14.0 1.30-1.40 700-800 55.7-63.7 6.5-8.0 51.7-63.7
TM-2B 10.0-11.0 1.00-1.10 700-780 55.7-62.1 3.5-4.2 27.8-33.4
TM-2C 11.0-11.8 1.10-1.18 680-750 54.1-60.0 4.0-4.5 31.8-35.8
TM-4A 6.0-7.0 0.60-0.70 550-620 43.7-49.3 1.3-1.6 10.3-12.7
TM-4B 6.0-7.0 0.60-0.70 500-550 39.8-43.7 1.3-1.5 10.3-11.9
TM-4C 5.0-6.0 0.50-0.60 650-750 51.7-60.0 1.3-1.7 10.3-13.5
TM-4D 5.6-6.5 0.56-0.65 1000-1150 79.6-91.5 1.6-2.0 12.7-15.9
TM-5AB 8.0-9.5 0.80-0.95 130-190 10.3-15.1 - -
TM-8B 8.3-9.0 0.83-0.90 1380-1550 110-123 4.8-5.4 38.2-43.0
TM-8C 8.5-9.0 0.85-0.90 1500-1650 119-131 5.0-6.5 39.8-51.7
TM-8E 7.5-8.5 0.75-0.85 1800-2100 143-167 5.5-7.0 43.8-55.7
TM-9B 10.0-11.0 1.00-1.10 1500-1600 119-127 9.0-11.0 71.6-87.5
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