N38 or N40 Half Ring Permanent Magnet

Custom Big Neodymium Ring Magnets in Grade N38 or N40 

Looking for Half Ring Permanent Magnets :
I want to know whether you have the below magnets on stock:
Shape: Half Ring
Material & Grade: N38 or N40 Neodymium Magnet
Big Size: OD4.3" * ID3" * 0.7"
Magnetized through Thickness

Magnetization Direction: 
Could you please specify the quantity of your demand?
Our price will be based on quantity.

Looking for Ring Magnets:
Can you manufacture the whole ring as well with the same dimensions? Please mind the direction of magnetization: through thickness: North Pole on top and South Pole on bottom.

Neodymium Magnet Manufacturer China Rare Earth Magnet Limited: 

Yes, we can make a whole ring with same dimensions.
I will send you the prices of both grade N38 and N40.
And you can decide which grade you wish to order.
Please check the following prices:
Material: NdFeB Permanent Magnet
Shape: Ring
Size: OD4.3" * ID3" * 0.7"
Plating: NiCuNi
Magnetized through 0.7"
N38/Ex-works Shenzhen USD***/pc
N40/Ex-works Shenzhen USD***/pc
The above size is very large.
As technician team replied, the above prices are based on trial production.

Environmental Friendly Technologies of NdFeB Magnet 20151020

Magnet Manufacturer China Rare Earth Magnet Limited 

Nd-Fe-B permanent magnet (king of magnets) is widely used in different technical fields with broad application prospects, for comparing to other magnet material, neodymium magnet has higher remanence, magnetic coercivity and the best magnetic energy product.

While the neodymium-Iron-Boron magnet has a wide range of applications with its excellent magnetic properties and low cost, its poor corrosion resistance is a major drawback.

Under static immersion experiment at room temperature, corrosion speed of neodymium samples is measured 0.188g/m2.h in 3% sodium chloride solution, while the corrosion rate of carbon steel 0.119g/m2.h.

Meanwhile, electrochemical performance experiment result proves that neodymium permanent magnets are more susceptible to corrosion than carbon steel, but the electrochemical properties of both are similar to a certain degree.

Many of the scholars and researchers at home and abroad believe that Nd-Fe-B is a powder metallurgy products. Because of the difference between Nd phase, boron-rich phase, neodymium-Iron-Boron potentials, corrosion of Nd-Fe-b is mainly reflected as intergranular corrosion based on electrochemistry. Therefore, it is an eternal theme to ensure that the Neo magnets are not affected by corrosion and ensure that the magnetic properties of Nd-Fe-B magnet do not loss.

Corrosion of Nd-Fe-B permanent magnet is mainly dealt with by plating of nickel, zinc, phosphate, epoxy and others are the main solutions to problem of Corrosion problem. But blackening phenomenon of neodymium-Iron-Boron is seldom seen in reports. Hereby we will discuss black conversion film for NdFeB magnets based on the mechanism of iron and steel blackening.

Permanent Magnets 20150924

Neodymium Magnets VS Ferrite Magnets 

Do permanent magnets really harm our body? 
1. Harm of magnetic field: magnetic fields can promote human blood circulation, and there is no statistic indicating that the magnetic field is harmful to the human body, so we do not need to worry about harms of magnetic field.
2. Whether or not magnetic field harms human body depends on the strength of magnetic field. Generally strength of magnetic field less than 3000 Gauss (magnetic field units) does no harm to human body. Magnetic field strength over 3000 Gauss may harm human body. However such harm of magnetic field to human body is so little that it can be ignored. According to test, the harms magnetic field do on people is only one-fifth of TV.

"High temperature magnet" --- ferrite magnets VS neodymium iron boron magnets

Ferrite permanent magnets and neodymium magnets are different in the following ways:
1. NdFeB magnets are highly temperature-resistant, usually can stand 80 degrees, and demagnetization occurs when the operating temperature exceeds 80 degree.
2. Stability of ferrite magnets is excellent. It is oxide itself, and very stable, while Nd-Fe-B magnet is alloy, and prone to oxidation, so coating is necessary.
3. Performance of neodymium permanent magnets is better than that of ferrite.
4. Price of ferrite is much more favorable than that of NdFeB.

Application of pushing and pulling forces of magnets in rail transport 
There being two different types of magnetic force:
pulling and pushing force, there are two different corresponding application types of magnetic floating trains: a: railway based on repulsion force generated by superconducting electromagnets on trains and coil forces of rails; b railway based on pulling forces of permanent magnet, which means installing magnets at the bottom and tops of the train and equip the T-rail with reaction plate and induction steel plates on bottom and arm parts to control the electric current through magnets, and keep a distance of 10 mm between the magnet and guides (error of plus or minus 2 mm) and to maintain the gravity balance of rail steel and vehicles, so that the vehicles runs suspending on the tracks.

Hot Extrusion Magnets 20150831

Isotropic & Anisotropic Neodymium Permanent Magnet Manufacturer

China Rare Earth Magnet Limited produces two kinds of hot extrusion NdFeB magnets: hot extrusion of isotropic neodymium magnets (MQ2) and hot extrusion of anisotropic magnets (MQ3).

Hot-pressing isotropic NdFeB magnet is isotropic magnet by compacting rapid quenching neodymium iron boron magnetic powder at high temperature.

Hot extrusion anisotropic NdFeB magnet is mainly the radiation orientation of annular magnet, which is made by rapid quenching neodymium permanent magnet powder compacted and extrusion deformed under high temperature.

Features:
1. High magnetic strength, the maximum magnetic energy of radial orientated magnet ring can reach 240 ~ 360 kj/m3.
2. The magnetism of ring magnets across radial orientation, the magnetism is uniform, making the motor run quiet, the torque output is smooth
3. The high heat resistance, the maximum operating temperature can reach 180 ℃.
4. The magnetization poles and magnetic declination are not to be scheduled in the magnet forming process, can be made by changing and designing magnetization coil.
5. The magnetization waveform of the ring magnets can be magnetized as rectangle waveform and other special magnetization waveform according to the user’s requirements.
6. Multi-poles and poles deflection of ring magnets can be realized without assembling, which enables the assembly of motors conveniently.
7. The ring magnet is built in nanocrystalline structure, high density, and has excellent corrosion resistance with epoxy electrophoretic coating
8. The thickness of Epoxy electrophoretic coating can reach 20-35 microns.
9. Hot extrusion anisotropic rare earth permanent magnet ring with radiation orientation is mainly used in EPS motor, servo motor, electric tools, and all kinds of dc motors, etc.

Bonded Neodymium Magnet

NdFeB Permanent Magnet Manufacturer – China Rare Earth Magnet Limited 

Commonly, bonded neodymium magnets are made of NdFeB powder and epoxy resin. Also, they can be molded and extruded with plastic. They have the following characteristics.

1. High Magnetic Performance
The magnetism, which is consistent and stable, is between sintered neodymium magnets and ferrite magnets.

2. High Precision and Great Free Degree of Shape
The shapes and sizes are decided by molds, which can be made into ring, arc, block and so on. They do not need sintering or post processing.

3. Excellent Corrosion-resistance
They can be used for long time in daily or bad environment after being coated or specially process.

4. Various Magnetization Method
They can be magnetized with multi-poles, oblique poles. Also, waveforms include square wave and sine wave.

Bonded neodymium magnets are mainly used in various kinds of micro permanent magnet motors, including spindle motors, stepping motors, synchronous motors, direct current motors and DC brushless motors. They can partly take place of neodymium magnets and ferrite magnets, which makes assembly process simpler, cheaper, more reliable and more efficient.

N35 Magnets

N35 Neodymium Permanent Magnets in Disc, Block, Ball, Ring 

N35 Neodymium Disc Magnets Manufacturer China Rare Earth Magnet Limited: 
Material: Sintered Neodymium Iron Boron Magnets
Grade: N35
Plating: NiCuNi
Magnetized through Thickness 30mm
Size: D45x30mm / Price: USD***/pc
Size: D50x30mm / Price: USD***/pc
Size: D60x30mm / Price: USD***/pc

N35 16x10x2mm Neodymium Block Magnets: 
We are an experienced manufacturer of permanent magnets .
Material: Sintered NdFeB Magnets
Grade: N35
Size: 16x10x2mm
Plating: Zinc Magnetized through Thickness 2mm
USD***/pc

Neodymium Magnetic Ball Manufacturer China Rare Earth Magnet Limited: 
We are neodymium ball magnets manufacturer, if you want to order such products, we need to know the grade, size, and quantity.
Grade: N35
Size: D5mm
Magnetized Through Diameter
Plating / Price:
NiCuNi / USD***/pc
Gold / USD***/pc
Color Blue / USD***/pc

N35 Ring Neodymium Magnets : 
Material: Sintered NdFeB Magnets
Grade: N35 Permanent Magnet
Plating: NiCuNi
Magnetized through Axial
Size/Price:
D50.8xd44.45x9.53mm / USD***/pc
D26.92xd12.497x9.98 / USD***/pc
D9.53xd3.175x1.52mm / USD***/pc

N50 Block Permanent Magnets 20150604

N35, N42, N50 Neodymium Block Magnets 50x20x9mm with NiCuNi Coating 

50x20x9mm Neodymium Block Magnets :
I’m from México. I'm looking for magnets neodymium with dimensions 20 mm x 50 mm x 9 mm thick. Please send proposals and prices, we need as 1000 pieces.

NdFeB Magnets Manufacturer China Rare Earth Magnet Limited: 
Thanks for your enquiry about neodymium permanent magnets.
You didn't mention the grade of the magnet in last email. We provided a quotation below based on N35, N42 and N50 for your reference. The maximum working temperature of these materials is 80℃.
Material: Sintered NdFeB Magnets
Size: 50x20x9mm
Magnetized through 9mm
Grade / FCA Hong Kong Price
N35 / USD***/pc
N42 / USD***/pc
N50 / USD***/pc
Please feel free to contact us if you would like to order or have other questions.

Magnetic Properties: 
I have some questions:
1. How many gauss has the N50 grade?
2. How many gauss has the N42 grade?
3. Has coating to prevent corrosion?

Magnetic Properties of N42 & N50 Neodymium Magnet: 
Here is the magnetic property of N42 and N50 permanent magnet for your reference. Which grade would you like to order?

Yes. Ni-Cu-Ni is a triple layer coating of Nickel-Copper-Nickel which is good to prevent magnets from oxidation and corrosion.
I will calculate shipping cost and total amount for you when you decide to order.

Magnet Order: 
We will request 1,000 pieces grade N50, please give me your account number to make the transfer if you can calculate the shipping cost.

Permanent Magnet Manufacturer China Rare Earth Magnet Limited: 
We are pleased to receive your order of N50 magnets.
The gross weight of 1000 pieces is 92KGS or so. Which airport is the nearest one to your delivery address?
I will calculate air freight cost for you.

Shipping Neodymium Magnets by Air: 
The name is International Airport of Mexico City.

China Rare Earth Magnet Limited: 
We prepared a Pro-forma Invoice attached for your information.
Please arrange payment after you confirm to order the magnets.