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Rainbow Magnet Ltd.
Rainbow Magnet Ltd.  

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Neodymium Iron Boron Rectangular Block Magnets 

Price: 1.0~10.0 USD 
Payment Terms: T/T,L/C 
Place of Origin: Zhejiang, China (Mainland) 
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Product Detail

Model No.: RM-B13
Production Capacity: 100 ton/month
Delivery Date: 18 days
Shape: Block
Composite: NdFeB Magnet
material: Neodymium Iron Boron
Means of Transport: Ocean,Land
Packing: standard carton by sea or b...
Application: Industrial Magnet
Type: Permanent
Brand Name: Rainbow

Rectangular block magnet with white-blue Zn coating.strong coating to slow down the oxidation rate. it is better resistant to corrosion.

picture show Rectangular Block ndfeb magnet:


Neodymium Iron Boron is a type of rare-earth permanent magnet. It is made from an alloy of neodymium, iron, and boron to form the Nd2Fe14B tetragonal crystalline structure. This material is currently the strongest type of permanent magnet in the world.

There are two kinds of magnets: Sintered NdFeB magnet and bonded NdFeB magnet.
This NdFeB rectangular block magnet is sintered NdFeB magnet,the magnetized through the thickness.
Nd-Fe-B permanent magnet is manufactured in a wide range of shapes, sizes and grades according customer's demand.
NdFeB has a very high energy product and coercivity, can pick up 660 times of own weight of heavy objects.
The advantage is high cost-effective, with good mechanical properties, easy cutting; according customer's demand to manufacture in a wide range of shapes, sizes and grades.
The shortcoming is easy to rust, oxidation, so the Sintered NdFeB's surface is usually required for plating such as zinc, nickel, silver, gold, etc., can also be done phosphorus treatment or spray epoxy resin to slow down the oxidation rate.
The EH grade and its details properties, the Maximum Operating temperature is under 200 degree.

pls see follow table.
Sintered NdFeB rectangular block magnet magnetic energy parameters
Grade
Residual Induction
Coercive Force
Intrinsic Coercive Force
Maximum Energy Product
Maximum Operating
Temperature
Br
Hcb
Hcj
(BH)max
Tw
T
KGS
KA/m
KOe
KA/m
KOe
KJ/m3
MGOe
N28EH
1.04-1.08
10.4-10.8
780-812
9.8-10.2
≥2388
≥30
207-223
26-28
≤200
N30EH
1.08-1.12
10.8-11.2
804-844
10.1-10.6
≥2388
≥30
223-239
28-30
≤200
N33EH
1.14-1.17
11.4-11.7
820-876
10.3-11.0
≥2388
≥30
247-263
31-33
≤200
N35EH
1.17-1.21
11.7-12.1
860-907
10.8-11.4
≥2388
≥30
263-279
33-35
≤200
N38EH
1.22-1.26
12.2-12.6
860-907
10.8-11.4
≥2388
≥30
287-303
36-38
≤200
Note: The above mentioned data of magnetic parameters and physical are given at 20℃±2℃

The above demagnazation durve is for 33EH magnet grade at difference temperature.

The main physical properties of sintered NdFeB rectangular block magnet:
magnetic properties
Parameters
Density /g.cm3
Vickers Hardness HV
Resistivity /υΩ.cm
Compressive strength/N.mm-2
Coefficient of Thermal Expansion (C⊥)/K-1
Coefficient of Thermal Expansion (C∥) /K-1
7.45
570
150
780
-4.8X10-6
-3.4X10-6

This magnet is coated white zinc,it has better resistant to corrosion. pls see the compare of salt spray test results for coating
Commonly type of coating
Coating thickness(um)
Neutral
salt spray test
dark Ni
Cu
Shine Ni
Total
Single-layer Ni
25
25
24h
normal
Double-layer Ni
12
10
25
72h
better
Dark Ni-Cu–shine Ni
6.25
8.75
10
25
120h
excellent

APPLICATION:
magnetic magnetization device
micro motors,
electronic industry,
sound device magnetic suspension system,
magnetic transmission machine
magneto therapy equipment
MRI
magnetic machine
magnetic equipment
magnetic water
magnetic seal
oil magnetization of paraffin
magnetic connection,
magnetic drive,
Permanent magnet crane
electromagnetic pumps
magnetic thrust axis,
magnetic machinery,
magnetic spring,
magnetic vibration device
magnetic separators
bigPhoto
 Ms. Annie

Tel: 86-574-87840198
Fax: 86-574-87393806
Mobile: 86- 189 5744 9606
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Company Info

Rainbow Magnet Ltd. [China (Mainland)]


Business Type:Manufacturer
City: Ningbo
Province/State: Zhejiang
Country/Region: China (Mainland)

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