SAMARIUM COBALT

PERMANENT MAGNET

SAMARIUM COBALT

Rare Earth Permanent Magnets

It is the first type of rare earth magnet made, it is composed of a Samarium and Cobalt alloy which has good magnetic properties together with a high operating temperature and excellent resistance to corrosion. The materials making up the alloy are ground, mixed and transformed into a magnet using the metallurgical techniques of the powders, similar to those used for Ferrite magnets. The powders are aligned with the application of an oriented magnetic field, then they are compressed and sintered at about 1,100 ° C to increase their density.

Unlike Neodymium magnets, which need high percentages of Dysprosium (Dy) to work at moderately high temperatures (max. 220 ° C), Samarium Cobalt magnets use materials that are more widely available and are intrinsically more stable, allowing them to work at operating temperatures up to 350 ° C. Samarium Cobalt magnets are appreciated in the military, aerospace and electromedical sector and in general should be favored when there are problems related to high temperatures or oxidation in the device.

TECHNICAL FEATURES SAMARIUM COBALT

CORROSION
RESISTANCE

Samario Cobalt magnets have a high resistance to corrosion and generally no surface protection treatment is required. This characteristic together with a good resistance to demagnetization make Samario Cobalt magnets suitable for use in extreme work environments.

HIGH TEMPERATURE
WORKING POINT

Although the Curie point for SmCo magnets is between 750 and 850 °C, the current compositions of this alloy can, depending on the grade, be used up to maximum working temperatures above 350 °C.

HIGH DENSITY
ENERGY

Their production is more expensive because the Smario is a rarer element than Neodymium, but the energy density is comparable to that of NdFeB magnets.

HIGH
COERCIVITY

The coercive force is extremely high and exceeds some other permanent magnets. Cobalt-samarium alloys are difficult to demagnetize.

MAGNETS COMPARED IN THE HYSTERESIS CYCLE
FEATURES OF DIFFERENT MAGNETS

APPLICATIONS

LIST OF MOST DIFFUSED APPLICATIONS

ELECTRIC MOTORS

Permanent Magnet motors have characteristics with low torque values ​​and constant presumptions

SENSORS

Magnetic sensors are used to verify the position without need of contact.

AEROSPACE

Given their particular characteristics, the mageni in Samario Cobalo are the most used in the aerospace field, where the conditions of use are extreme.

LINEAR MOTORS

A linear motor is an electric motor in which the rotor and the stator instead of being circular are "unrolled", and instead of producing a mechanical moment they produce a force.

HIGH TEMPERATURE

Samarium-cobalt magents are used in applications where very strong magnetic fields are required in extreme conditions (temperatures from -40 to 350 degrees temperature) range.

FAQs

TECHNICAL AND OPERATING INFORMATIONS

Differences between Sm2Co17 and SmCo5

Sm2Co17 The main alloy is called Sm2Co17 (magnetic energy density 170-260 kJ / m3) and is composed of approximately 35% Samarium (Sm) and 60% Cobalt (Co) the remainder, from different quantities of Iron (Fe), Copper (Cu), Hafnium (Hf) and Zirconium (Zr). Maximum working temperature is 350 ° C
SmCo5 There is another alloy called SmCo5 (magnetic energy density 110-190 kJ / m3). Maximum working temperature is 250 ° C

Why are Samarium Cobalt magnets so fragile?

Samarium-cobalt magnets can chip easily; these magnets have no mechanical integrity; SmCo magnets must be used for their magnetic functions and other mechanical systems must be designed to provide the mechanical reliability of the system. We recommend an appropriate protection during handling.

Can SmCo magnets be coated?

Samarium cobalt magnets show good corrosion resistance compared to neodymium magnets. Coating a samarium cobalt magnet makes sense when operating under vacuum to reduce gas leakage or to help protect the magnet from chipping. Samarium cobalt magnets must be coated when working in an acid environment.