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Magnetic Alloys and Intermetallics

Magetic Alloys and Intermetallics ImageMagnetic alloys and intermetallics are metallic materials capable of producing a constant magnetic field for a prolonged period of time. There are only a limited number of chemical elements that can produce alloys with permanent magnetic properties at ambient temperature; Fe, Ni, Co and rare earth metals are the most important ones.

The magnetic materials offered by Sigma-Aldrich are capable of producing a high magnetic field with a low mass. They are also fairly stable against influences to demagnetize them. Major properties of our materials are described by the parameters shown below.

Maximum Energy Product, B(H)max: The point on the demagnetization curve where the product of Magnetic Induction (B) and Magnetic Field Strength (H), reaches a maximum and the volume of magnetic material required to project a given energy is minimum.

Residual Induction, Bmax: The point at which the hysteresis loop crosses the B axis at zero magnetizing force and represents the maximum magnetic flux output from the given material.

Coercive Force, Hc: The demagnetizing force necessary to reduce observed induction, B, to zero after the magnet has previously been brought to saturation.

Maximum Operation Temperature: Maximum temperature at which magnetic materials still retain their magnetic properties.


Magnetic Alloys

Type Name Comments Product #
Samarium-Cobalt Alloys SmCo5, alloy 18,
Discs 10X6 mm
B(H)max =140 kJ/m3 (18 MGsOe),
Br = 0.87T (8.7kGs), Hcb = 680 kA/m
Sm2Co17, alloy 24,
Discs 10X6 mm
B(H)max =190 kJ/m3 (24 MGsOe),
Br = 1.0T (10.0kGs), Hcb = 740 kA/m
Sm2Co17, alloy 30,
Discs 10X6 mm
B(H)max =240 kJ/m3 (30 MGsOe),
Br = 1.16T (11.6kGs), Hcb = 840 kA/m
Aluminium-Nickel-Cobalt Alloys AlNiCo, alloy 1,
Discs 13X6 mm
B(H)max =8.0 kJ/m3 (1 MGsOe),
Br = 0.43T (4.3kGs), Hcb = 30 kA/m
AlNiCo, alloy 5,
Discs 13X6 mm
B(H)max =40.0 kJ/m3 (5 MGsOe),
Br = 1.25T (12.5kGs), Hcb = 48 kA/m
AlNiCo, alloy 11,
Discs 13X6 mm
B(H)max =84.0 kJ/m3 (10.6 MGsOe),
Br = 1.12T (11.2kGs), Hcb = 109 kA/m
Neodymium-Iron-Boron Alloys NdFeB alloy 30/100,
Discs 13X6 mm
B(H)max =239.0 kJ/m3 (30 MGsOe),
Br = 1.14T (11.4kGs), Hcb = 820 kA/m,
Max. temp. 100 °C
NdFeB alloy 30/150,
Discs 13X6 mm
B(H)max =247.0 kJ/m3 (31 MGsOe),
Br = 1.13T (11.3kGs), Hcb = 844 kA/m,
Max. temp. 150 °C
NdFeB, alloy 30/200,
Discs 13X6 mm
B(H)max =248.0 kJ/m3 (31 MGsOe),
Br = 1.14T (11.4kGs), Hcb = 835 kA/m,
Max. temp. 200 °C
B(H)max: Maximum Energy Product; Br: Residual Induction; Max. temp.: Maximal operation temperature; Hcb: Coercive force through magnetization.

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Sintered NdFeB alloys:
  • The most powerful magnets available
  • Manufactured by a power metallurgical process, involving the sintering of powder compacts under vacuum
  • Grinding and slicing possible
  • Low resistance to corrosion
  • Coating may be applied depending on the expected environment
Application: electronic devices, electric motors, engineering equipment, medical equipment.
Sintered SmCo alloys:
  • Most excellent temperature characteristics in Rare Earth magnet family
  • Manufactured by powder metallurgical process involving the sintering of powder under vacuum
  • Good corrosion resistance
  • No additional surface treatment required
  • Grinding and slicing operations possible
Applications: electronic devices, sensors, detectors, radars, and other high-tech equipment.
Cast Alnico alloys:
  • Vast range of complex shapes and sizes at an economical cost ideal for high temperature application up to 550 °C
  • Good corrosion resistance
  • Density ranging from 6.9 g/cm3 to 7.39 g/cm3
  • A typical hardness—
    50 Rockwell C
  • Suitable for grinding
Application: automotive applications, electronic devices, electric motors, aerospace applications, equipment.