Neodymium Magnets

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Neodymium magnets are part of the rare earth group, this type of permanent magnet is the strongest magnet on the market. Despite their small dimensions, neodymium magnets have the strongest magnetic properties concerning the size of the magnet.

Neodymium magnets are high-precision magnets, depending on the space in which we are going to use them and the sector in which we are going to apply them, we can find different sizes and grades. Neodymium magnets are created under a casting process, which is why we can find them in various forms.

Since the neodymium magnet is manufactured by sintering, this allows us a great variety of designs and shapes, for example: round, rectangular, square, and long…

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CHARACTERISTICS

Type of material

Metal
Rare earth

Composition

Neodymium (Nd)
Iron (Fe)
Boron (B)

Work temperature

From 80ºC to 200ºC

Advantages

Powerful magnets
High coercivity and remanence
Application in confined spaces

Neodymium magnets or powerful magnets are permanent magnets with the highest strength and high coercivity. It is the strongest magnet on the market and the most widely used in the industrial sector.

The production of neodymium magnets has a low resistance to corrosion so it has a protection or coating to ensure the maintenance and durability of the magnet over time, this coating will prevent it from losing its properties and being affected by corrosion and external chemical agents.

The coating of the neodymium magnet can be epoxy, nickel, zinc, copper, and others. Below, we can see a table of neodymium magnet qualities in which we find the remanence, the coercive force, the working temperature, and the minimum and maximum resistance of each type of neodymium quality.

Most neodymium magnets, due to their high remanence and coercivity, mentioned above, can be used in the electronics sector.

Neodymium magnets or strong magnets have a high density and a degree of magnetisation of 5,000 gauss and 52 MGOe. The higher the grade, the more magnetisation the magnet will have, as it is made of neodymium magnets, the letter in the grade is an N. Neodymium magnets have a degree of magnetisation that can vary from N27 to N52. Neodymium magnets have a higher price than ferrite magnets because of the complexity of obtaining their raw material.

All neodymium magnets are anisotropic and therefore only can magnetise in one direction. The magnetisation of square neodymium magnets is diametrically magnetised.

CONSULT QUALITY TABLE

	Grado	Nomenclatura	Remanencia			Fuerza Coercitividad			Coercitividad Intrínsica			Energía Máxima Producto	Temperatura de Trabajo
Neodimyum Magnets	Grade	Nomenclature	Br max (T)	Br min (T)	HcB min (kA/m)	HcB max (kA/m)	HcJ min (kA/m)	HcJ max (kA/m)	BHmax min (kJ/m³)	BHmax max (kJ/m³)	Max. Temp. trabajo: (ºC)
Neodimyum Magnets	Grade	Nomenclature	Br			bHc			Fuerza Ihc			(BH) max	Temperatura de Working temp
	Grade	Nomenclature	Remanence			Coercive force			Intrinsic coercive			Maxium energy product	Working temp
NdFeB N30H anistropic	N30H	NdFeB 223/135	1,08	1,12	794	836	1353	'-	223	239	120
NdFeB N33H anistropic	N33H	NdFeB 247/135	1,14	1,17	836	876	1353	'-	247	263	120
NdFeB N45M anistropic	N45M	NdFeB 342/111	1,33	1,35	971	1003	1114	'-	342	358	100
NdFeB N42M anistropic	N42M	NdFeB 318/111	1,29	1,32	955	987	1114	'-	318	334	100
NdFeB N40M anistropic	N40M	NdFeB 303/111	1,26	1,29	924	955	1114	'-	303	318	100
NdFeB N38M anistropic	N38M	NdFeB 287/111	1,22	1,26	900	939	1114	'-	287	303	100
NdFeB N35M anistropic	N35M	NdFeB 263/111	1,17	1,20	868	900	1114	'-	263	279	100
NdFeB N52 anistropic	N52	NdFeB 398/88	1,42	1,45	794	860	875	'-	398	414	80
NdFeB N50 anistropic	N50	NdFeB 383/88	1,40	1,43	794	860	875	'-	383	398	80
NdFeB N48 anistropic	N48	NdFeB 367/88	1,38	1,40	810	860	875	'-	367	383	80
NdFeB N45 anistropic	N45	NdFeB 342/96	1,33	1,36	924	955	955	'-	342	358	80
NdFeB N42 anistropic	N42	NdFeB 318/96	1,29	1,31	915	939	955	'-	318	334	80
NdFeB N40 anistropic	N40	NdFeB 303/96	1,26	1,29	908	924	955	'-	303	318	80
NdFeB N38 anistropic	N38	NdFeB 287/96	1,22	1,26	900	915	955	'-	287	303	80
NdFeB N35 anistropic	N35	NdFeB 263/96	1,17	1,20	860	900	955	'-	263	279	80
NdFeB N33 anistropic	N33	NdFeB 247/96	1,14	1,17	820	876	955	'-	247	263	80
NdFeB N42SH anistropic	N42SH	NdFeB 318/160	1,28	1,30	955	987	1595	'-	318	334	150
NdFeB N34AH anistropic	N34AH	NdFeB 247/255	1,10	1,16	836	900	2547	'-	247	271	220
NdFeB N33AH anistropic	N33AH	NdFeB 247/263	1,13	1,15	844	876	2626	'-	247	263	220
NdFeB N30AH anistropic	N30AH	NdFeB 223/263	1,08	1,12	804	844	2626	'-	223	239	220
NdFeB N33EH anistropic	N33EH	NdFeB 247/239	1,13	1,15	844	876	2388	'-	247	263	200
NdFeB N30EH anistropic	N30EH	NdFeB 223/239	1,08	1,12	804	844	2388	'-	223	239	200
NdFeB N28EH anistropic	N28EH	NdFeB 207/239	1,04	1,08	780	811	2388	'-	207	223	200
NdFeB N38UH anistropic	N38UH	NdFeB 287/199	1,22	1,25	908	939	1990	'-	287	303	180
NdFeB N35UH anistropic	N35UH	NdFeB 263/199	1,17	1,19	876	900	1990	'-	263	279	180
NdFeB N33UH anistropic	N33UH	NdFeB 247/199	1,13	1,15	844	876	1990	'-	247	263	180
NdFeB N35AH anistropic	N35AH	NdFeB 263/263	1,17	1,19	876	915	2626	'-	263	279	220
NdFeB N40SH anistropic	N40SH	NdFeB 303/160	1,25	1,27	939	963	1595	'-	303	318	150
NdFeB N38SH anistropic	N38SH	NdFeB 287/160	1,22	1,25	908	939	1595	'-	287	303	150
NdFeB N35SH anistropic	N35SH	NdFeB 263/160	1,17	1,20	876	900	1595	'-	263	279	150
NdFeB N33SH anistropic	N33SH	NdFeB 247/160	1,14	1,17	844	876	1595	'-	247	263	150
NdFeB N42H anistropic	N42H	NdFeB 318/135	1,28	1,30	955	987	1353	'-	318	334	120
NdFeB N40H anistropic	N40H	NdFeB 303/135	1,26	1,28	924	955	1353	'-	303	318	120
NdFeB N38H anistropic	N38H	NdFeB 287/135	1,22	1,26	900	939	1353	'-	287	303	120
NdFeB N35H anistropic	N35H	NdFeB 263/135	1,17	1,20	868	900	1353	'-	263	279	120

Advantage

Neodymium magnets or powerful magnets are the most commonly used magnets due to their great advantages. The greatest advantage that we can find in neodymium magnets is the great magnetisation force that they possess about their size.

Neodymium magnets are the magnetic elements with the highest remanence and high coercivity. Thanks to its magnetic properties, the neodymium magnet is the most powerful magnet on the market and is the most widely used in the industrial sector.

Neodymium magnets of the same size as other magnets, such as ferrite magnets, are stronger, and in some cases, being smaller in size, they can even withstand more force.

Work temperature

Neodymium magnets can be treated at a maximum temperature of 80ºC. If at any time they are subjected to a temperature higher than 220ºC, the neodymium magnet will begin to lose its properties as the temperature increases.

The working temperature of the neodymium magnet is one of the factors to be taken into account in the application of the magnet.

At IMA we currently have a wide range of powerful magnets that cover temperatures from 80ºC to 220ºC in Neodymium, from 220ºC to 350ºC, we have the alternative of Samarium magnets.

Covering:

Covering	Type	THICKNESS	COLOUR	OBSERVATIONS	WORK TEMPERATURE
Níquel	Ni+NI	10-20 µm	Silver (bright)	Excellent resistance to the humid atmosphere	200°C
Níquel	Ni+Cu+NI	10-20 µm		Resistance superior to the humid atmosphere	200ºC
Zinc	Zn azul	8-20 µm	Blue-silver	Good resistance to salinity	160ºC
Zinc	Color Zn	8-20 µm	Blue-silver	Excellent resistance to salinity	160ºC
Estaño	Ni+Cu+Sn	15-20 µm	Silver bright	Resistance superior to the humid atmosphere	160°C
Cobre	Ni+Cu	10-20 µm	gold	Temporary treatment
Epoxi	Ni+Cu+epoxy	15-25 µm	black	Excellent resistance to weather and salinity	120°C

Additional protection for the neodymium magnet will ensure long-term maintenance and durability, preventing it from losing its properties and possible corrosion by external chemical or atmospheric agents.

As mentioned above, neodymium magnets are fragile due to their low corrosion resistance, so we need a coating to protect them. In addition to the protective function, it also acts as an increase in the corrosion resistance of neodymium magnets to treat them in places with a high degree of humidity. In this way, the magnet can withstand lower temperatures and prevent oxidation.

Neodymium magnets can be coated with epoxy, nickel, zinc, copper, and others. However, nickel coatings are mostly used for neodymium magnets. The nickel coating for neodymium magnets has a high performance and a high corrosion resistance.

Applications

Due to their strong magnetic properties, neodymium magnets can be used for a large number of applications, thanks to their high magnetising force.

In our daily lives, we can find neodymium magnets in door locks, making the function of allowing the opening and closing of fire doors. Also, one of the major applications that is currently booming is electric cars, more specifically in motors and generators, neodymium magnets are responsible for transforming electrical energy into mechanical energy.

Electric Motors
Wind Turbines
Hard Drives
Speakers
Headphones
Magnetic R. Scanners
Sensors
Generators
Magnetic Separator

Production process

Neodymium magnets go through different stages until reaching the final product:

The raw materials are introduced in a mold where they are later melted and distributed in molds so that later they are given a solid form when they cool.
Then, a very fine octopus is created, from the previous physical form that goes through the sintering phase, passing to the liquid state. In the sintering phase, the particles align and fall together to create dense pieces.
These pieces finally obtained are in the form and the size we want.
Finally, the neodymium magnet is magnetized and the magnet that we all know is made.

Once we have finished following all these steps, a certificate of quality must be issued to ensure that the neodymium magnet has been manufactured correctly.