::ESSEN Magnetics::

E-mail |

You are here: Products > Rare earth > NdFeB

PRODUCTS LIST

PERMANENT MAGNETIC MATERIALS

Rare earth

NdFeB

Smco

Ceramic

Alnico

INDUSTRIAL MAGNETIC DEVICES

Power lift magnets

Magnetic Cup Assemblies

Neodymium Assemblies

Magnetic Swarf colletor

Magnetic Tool Racks

Magnetic Catcher

Magnetic Filter

Telescopic Pick-up Magnet

Cow magnets

Welding Holders

MAGNETIC TOYS

PRODUCTS INFORMATION

Rare Earths magnets are the most advanced commercialized permanent magnet materials. Collectively known as Rare Earths are the Neodymium Iron Boron (NdFeB) magnets and Samarium Cobalt (SmCo) magnets. Within each of these classes of Rare Earth magnets are a number of different grades, which span a wide range of properties and application requirements.

NdFeB magnets are available in sintered as well as bonded forms. The sintered form usually requires some finishing operations in order to hold close mechanical tolerances. Rare Earth magnets are brittle, and machining operations should be performed prior to magnetization, using diamond tools.

Ring type

Block type

Segment type

APPLICATION:

- Speakers, Microphones, Hearing Aids;
- PM Motors, Alternators;
- Vibration Motors, Linear Motors;
- Electron Tubes;
- Generators And Actuators;
- Meters And Relays;
- Watches And CD-ROMs;
- Pick-Up Cartridges.

ESSEN offers the perfect magnets for precision weight and space saving applications. Sintered Neodymium Iron Boron magnets are high performance energy products ranging to 48MGOe and are in stock, ready to fabricate and ship. For detailed magnetic characteristics and typical curves for various grades of Sintered NdFeB magnets, please click here: Magnetic Properties.

MAGNETIC PROPERTIES

Material	Br		Hcj		Hcb		BHmax		Density	Temperature Coefficient		Curie Temperature Tc	Working Temperature TW
Material	mT	Gs	KA/m	Oe	KA/m	Oe	KJ/m³	MGOe	g/cm³	Near Br	Near Hcj	°C	°C
N30	1100	11000	955	12000	836	10500	231-255	29-32	7.4	-0.12	-0.60	310	80
N33	1150	11500	955	12000	836	10500	255-271	32-34	7.4	-0.12	-0.60	310	80
N35	1180	11800	955	12000	860	10800	263-287	33-36	7.45	-0.12	-0.60	310	80
N38	1230	12300	955	12000	875	11000	287-310	36-39	7.45	-0.12	-0.60	310	80
N40	1270	12700	955	12000	875	11000	310-326	39-41	7.45	-0.12	-0.60	310	80
N42	1300	13000	955	12000	875	11000	326-342	41-43	7.45	-0.12	-0.60	310	80
N45	1330	13300	875	11000	796	10000	342-366	43-46	7.45	-0.12	-0.60	310	80
N30H	1100	11000	1353	17000	836	10500	230-255	29-32	7.45	-0.11	-0.60	340	120
35H	1180	11800	1353	17000	970	11400	263-287	33-36	7.45	-0.11	-0.60	320-330	120
N38H	1230	12300	1353	17000	940	11800	287-310	36-39	7.45	-0.11	-0.60	320-330	120
N40H	1270	12700	1353	17000	971	12200	310-326	39-41	7.45	-0.11	-0.60	320-330	120
N42M	1300	13000	1194	15000	987	12400	326-342	41-43	7.45	-0.11	-0.60	320-330	120
N30SH	1100	11000	1592	20000	810	10200	230-255	29-32	7.5	-0.11	-0.58	320-330	150
N33SH	1150	11500	1592	20000	836	10500	255-271	32-34	7.5	-0.11	-0.58	320-330	150
N35SH	1180	11800	1592	20000	907	11400	263-287	33-36	7.5	-0.11	-0.58	320-330	150
N38SH	1230	12300	1592	20000	940	11800	287-310	36-39	7.5	-0.11	-0.58	320-330	150
N28UH	1060	10600	1990	25000	796	10000	215-239	27-30	7.5	-0.10	-0.54	320-330	180
N30UH	1100	11000	2000	25000	836	10500	231-255	29-32	7.5	-0.10	-0.54	320-330	180

SURFACE TREATMENT
NdFeB magnets are highly susceptible to corrosion. Coatings may be applied depending on the expected environment. We offer a variety of coating and plating options to prevent corrosion and mechanical damage.
Sintered NdFeB Magnets are prone to rust, usually need surface treatment according to customer's requirements. One or two coating layers are often needed depending on different working environments. The coating is with grey or black color. The finished coating is smooth, free of voids and pinholes. These coated magnets could survive in the salt fog spray test (5 % NaCl, 35 ) for 200 to 600 hours.

We can offer following coatings:

Surface	Coating	Thickness (Microns)	Color	Resistance
Passivation		1	Silver grey	Temporary protection
Nickel	Ni+Ni	10-20	Silver bright	Excellent to humidity
Nickel	Ni+Cu+Ni	10-20	Silver bright	Excellent to humidity
Zinc	Zn	8-20	Shining light blue	Good to salt spray
Zinc	Cu-Zn	8-20	Shining color	Excellent to salt spray
Tin	Ni+Cu+Sn	15-20	Silver	Superior to humidity
Aurum	Ni+Cu+Au	10-20	Shining gold	Superior to humidity
Copper	Ni+Cu	10-20	Shining gold color	Temporary treatment
Epoxy	Ni+Cu+Epoxy	15-25	Black, red, grey color	Excellent to climate humidity and salt spray
Epoxy	Zn+Epoxy	15-25	Black, red, grey color	Excellent to climate humidity and salt spray
Chemical	Ni	10-20	Silver grey	Excellent to humidity