Attention:

Certain features of Sigma-Aldrich.com will be down for maintenance the evening of Friday August 18th starting at 8:00 pm CDT until Saturday August 19th at 12:01 pm CDT.   Please note that you still have telephone and email access to our local offices. We apologize for any inconvenience.

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
692859-3EA
Sm2Co17, alloy 24,
Discs 10X6 mm
B(H)max =190 kJ/m3 (24 MGsOe),
Br = 1.0T (10.0kGs), Hcb = 740 kA/m
692840-3EA
Sm2Co17, alloy 30,
Discs 10X6 mm
B(H)max =240 kJ/m3 (30 MGsOe),
Br = 1.16T (11.6kGs), Hcb = 840 kA/m
692832-3EA
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
692883-3EA
AlNiCo, alloy 5,
Discs 13X6 mm
B(H)max =40.0 kJ/m3 (5 MGsOe),
Br = 1.25T (12.5kGs), Hcb = 48 kA/m
692867-2EA
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
692875-3EA
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
693790-5EA
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
693782-3EA
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
693820-3EA
B(H)max: Maximum Energy Product; Br: Residual Induction; Max. temp.: Maximal operation temperature; Hcb: Coercive force through magnetization.

For more information, please visit sigma-aldrich.com/metals.

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.