Single Side Neodymium Magnet

Magnets & Magnetic Assembly Manufacturer China Rare Earth Magnet Limited 

Single side magnet is a kind of neodymium magnetic assembly with strong magnetism on one side but much weaker on the other side. It is to use special processed galvanized cover wrap one side of the magnet, so the wrapped side will be magnetic shielding, the magnetic force is shifted to the other side, and then the magnetism of the other side will be increased.

Because all shielding technology cannot make its magnetism by refraction entirely, the so called "single-sided magnet” is the magnet with relatively stronger magnetism on single side.

Some applications just need the magnetism from one side; the magnetism of the other side may cause damage or interfere. While in some other applications, such as packaging need only one side of magnetism, the magnetism from the other side is not essential. So using a single side neodymium magnet assembly will greatly reduce the cost and save magnetic materials.

The magnetic reflection of the single side magnet similar to the refraction of satellite pot to signal or flashlight lamp to light, the refraction effect is mainly decided by the following three aspects:
1. Material: It has a close relationship with the choice of materials, the thickness, and the space between the permanent magnet and the materials. Pure iron leak magnetism easily, but the refraction will be increased after special treatment. However, 100% of shielding materials haven't been worked out presently.
2. The Angle: according to the principle of refraction, the effect of arc material is the best, while the refraction loss of right angle material is relatively bigger.
3. Space: the lines of magnetic force in the air like mobile phone signal, needs a space to reflect.
If the flashlight lamp is completely wrapped in the pot, the use effect is not good, because a large number of light refraction is wasted.

How to use the above principle and make the effect of magnetic strengthen to the best is an issue to choose the best between many parameters. In this way, the production cost will be greatly reduced in the industries of packaging and bags.

Single side permanent magnets are mostly applied in the application of these kinds of industries: printing and packaging, mobile phone box, wine box, tea box, gift boxes, bags, leather products, moon cake box, computer leather, clothing and white board button. The magnetic stability is very important. A lot of neodymium magnets with metal assembly made by poor quality material are without magnetism.

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.

N35 Ring Magnets D14xd8x12mm with Black Epoxy Coating

China Neodymium Permanent Magnet Manufacturer 

N35 Neodymium Ring Magnets: 
I had an idea for an invention that would make screwdrivers easier to use. I need to locate a neodymium N35 ring magnet with an inner diameter that would slip over a standard driver bit which I believe is between 7.7 an 8mm.
The outside diameter isn't critical, but it would be nice to have a thicker cross section, like 5 or 6 mm.
Do you have anything like that as a stock size?

Neodymium Magnet Manufacturer China Rare Earth Magnet Limited:
Currently we don't have same or similar sizes in stock.
We can produce permanent magnets in compliance with your specific dimensions.
How about the axially thickness of the ring magnets?
And how many pieces do you need?
D14xd8x thickness (mm)

N35 D14xd8x12mm Ring Magnets with Epoxy Coating: 
D14mm X d8mm X AT 12mm times 500 pieces N35 epoxy coated to start with to see how I can manufacture my new invention.
Shipping quote would be to Canada

Permanent Magnet Manufacturer China Rare Earth Magnet Limited: 
Please find our quotation as below:
Material: Sintered NdFeB Magnets
Size: ring, D14xd8x12mm
Grade: N35
Ex-works Shenzhen Price: USD***/pc
Magnetized through Thickness
Black Epoxy
Please feel free to contact us if you would like to order or have other questions.

Freight: 
Does that quote include shipping to Canada, or is that extra?

Shipping Neodymium Permanent Magnet by Express: 
The shipping cost was not included in the price I gave you.
The shipping cost of 500pcs to Canada by express excluding any taxes or duties is US$***.
I will send you a Pro-forma Invoice when you decide to order.

China Rare Earth Magnet Limited
Tags: Neodymium Magnet China, Ring Magnets

Rare Earth Permanent Magnet Technology Improves Financing Value of Neodymium Magnets

Neodymium Permanent Magnets Manufacturer China Rare Earth Magnet Limited 

Developed by China Aerospace Science and Technology Cooperation, bonded neodymium segment magnets with the biggest dimension, recently, are successfully manufactured by Aerospace Electro-magnet Cooperation in Hunan. Performance indexes of the sample all meet standard. It will soon be sent to the USA. Net weight of the bonded neodymium magnet reaches 400g, which is a Big Mac, comparing with traditional mini bonded neodymium magnets weighing only a few grams.

As a milestone in the development of rare earth permanent magnetic materials, neodymium magnet materials are called “King Magnet”, due to the excellent magnetic performance. With extremely high energy product, coercive force and energy dense, applications of neodymium permanent magnet materials are taken to an extreme, which are widely used in modern industry and electric technology and usually employed in instruments, motors and separators.

Permanent magnets play an important role in strategic emerging industry, of which the sophistication is a significant standard of evaluating a country’s technological level. As a priority in permanent magnets, neodymium magnets have an undoubtedly essential position in area of rare earth application. Zhang Anwen, secretary general of Chinese Society of Rare Earth indicates that in the future application area of rare earth, permanent magnets, oil catalytic cracking and emission purification will have the fastest growth. It is expected that in 2018, the compound growth rates will respectively reach 10.1%, 8% and 6%.

Some organizations point out that frequency air-conditioners, wind power and energy-saving elevators are the main growing power in extension of permanent magnets’ application, especially in automobile market. According to statistics, each hybrid power car consumes 2.5 kilograms of neodymium magnets and each electrical car needs 5 kilograms.

Meanwhile, according to expectation of Global Wind Energy Council, installation capacity of wind energy will be doubled during 2013 to 2017. In addition, lifting machines, oil pump motors, magnetic separators, electric tools and rail transportation will have stably increasing demand of rare earth permanent magnetic materials. It is estimated that demand of rare earth permanent magnet will reach 150 thousand tons after 5 years.

With continuous improvement of permanent magnet technology, neodymium magnet application will be broadened as well as investing value of rare earth metals will be manifested.

China Rare Earth Magnet Limited
Tags: Neodymium Magnets

Export Tariff of Rare Earth Will Be Canceled after May 2nd

Neodymium Magnets Manufacturer China Rare Earth Magnet Limited

On January 21st, in the first routine press conference of Ministry of Commerce in 2015, Shen Danyang, press secretary, indicates that according to change of domestic and foreign market, approved by State Council, Ministry of Commerce decides to cancel export quota of rare earth from January 1st and retains export tariff till May 2nd, 2015.

This means that after the elimination of export quota, timetable of export tariff of rare earth which draws much attention has been eventually specified.

In recent years, China government makes full use of economic and market means, takes a series of measures, strengthens export management of rare earth permanent magnets and promotes sustainable and healthy development of neodymium rare earth magnets industry in order to effectively protect and reasonably use rare earth resource, standardize market order, change development mode and realize industrial upgrading.

Shen Danyang says that cancel of rare earth is a trade policy choice for coordinating foreign and domestic market and two resources, which is not only a measure for reform of rare earth permanent magnets resource management, but a policy regulation for WTO’s ruling.

He declares that China will continue protecting resource products, promoting environmental protection, vindicating fair competition and realizing sustainable development according to WTO rules.

But comparing with elimination of rare earth export quota, export tariff attracts more attention, because the latter will bring larger impacts on rare earth neodymium magnets , even the whole rare earth market. “Abrogation of rare earth has less influence on current market. But if export tariff is abolished, government will also regulate the resource tax. Rare earth is national strategic resource, of which price will not drop back to low level. China will regulate export volume and price of rare earth in every respect.” Du Shuaibing says when interviewed by The First Financial Daily.

So far, six big rare earth manufacturers have acquired approval from Ministry of Industry and Information. From now on, production, sales and circulation of rare earth permanent magnet industry will become more standard and orderly. In addition, from May, 2015, related departments have stricken illegal mining and smuggle of rare earth for four years. Especially in 2014, 8 ministries including Ministry of Industry and Information cracked down on illegal behavior of rare earth, which can to some extent counteract negative impact on elimination of export quota and export tariff.

What’s worth paying attention to is that resource tax of rare earth should be increased, and that can fill the gap of cancel of rare earth export tariff.

Du Shuaibing analyses, “Increase of rare earth resource tax brings influence on separation cost of rare earth. Specifically, it increases regular cost of legal rare earth neodymium magnet manufacturers. But with advantage of cost, illegal rare earth manufacturers will become more rampant.”

Therefore, the future working focus is to fight against private mine and reduce market supply. Besides, through big groups’ integration, rare earth industry will be further managed. “Government can control rare earth in many aspects. For a long term, the important role of rare earth can not be neglected and it will have a good developing trend.”

China Rare Earth Magnet Limited
Tags: China Magnet, Permanent Magnet, Neodymium Magnet

Rare Earth Permanent Magnet Industry Will Usher Rapid Development Period Again

Neodymium Magnet Manufacturer China Rare Earth Magnet Limited Growth Chart of Global Rare Earth Neodymium Permanent Magnet Output
In 21st century, NdFeB magnet industries in Japan, America and Europe get slowdown in different degrees, but extraordinary development of China permanent magnet industry enable global sintered neodymium magnet industry to keep a sharp growth trend.

Academician Wang Zhenxi says that magnets output of China covers most of the global output. It is expected that rare earth magnet industry will usher a new rapid development period, which is boosted by new demand of low carbon economic industry, such as new energy cars and energy conservation motors.

With many years of innovation and development, China Rare Earth Magnet Limited developed neodymium wind turbine magnets, set up three production lines, produce large quantity of N35-N52 magnets every year. NdFeB permanent magnet industry has rapidly become a representative industry of China new material industry, which occupies 80% of global market share.

Under the impact of China neodymium magnet industry, structure of global magnet industry has a big adjustment from the end of 20th century to the beginning of 21st century. In 21st century, Wang Zhenxi believes that China rare earth permanent magnets can promote international configuration.

Tags: China Magnet