Ningbo magnet manufacturer

How to Choose Permanent Magnet Materials

wt2014 — Fri, 16 Jan 2015 16:44:41 +0000

Each permanent magnet material discussed above has its own pros and cons. How to choose the right one for your particular application is a challenge to any user. A balance between cost and performance must be considered in selecting of permanent magnet material. In Reference Information section of this page, several reference books are listed. These books may be helpful to you in designing and selecting permanent magnet materials. Following is a Comparison Table to help you select a right permanent magnet material for your applications.

Material	Cost Index	Maximum Energy Products (BH)max(MGOe)	Coercivity Hci(Koe)	Maximum Working Temperature(°C)	Machinability
Nd-Fe-B(sintered)	65%	Up to 45	Up to 30	180	Fair
Nd-Fe-B (bonded)	50%	Up to 10	Up to 11	150	Good
Sm-Co (sintered)	100%	Up to 30	Up to 25	350	Difficult
Sm-Co (bonded)	85%	Up to 12	Up to 10	150	Fair
Alnico	30%	Up to 10	Up to 2	550	Difficult
Hard Ferrite	5%	Up to 4	Up to 3	300	Fair
Flexible	2%	Up to 2	Up to 3	100	Excellent

Note: The data listed in the table are for reference only.

Classification of China magnets

wt2014 — Fri, 16 Jan 2015 15:55:44 +0000

Many different kinds of magnets, generally divided into two types: permanent magnets and soft magnets. What we call the magnets, generally refers to the permanent magnets. Permanent magnets divides into two major categories:
The first major categories are: metal alloy magnets including neodyimium magnet (NdFeB, Nd2Fe14B) , samarium cobalt magnet (SmCo), aluminum nickel cobalt magnet (ALNiCO). The second major categories are: Ferrite permanent magnet (Ferrite)

1. Ndfeb magnets: it is found that the highest performance magnets Known as the king of magnets, has the extremely high magnetic to its maximum magnetic energy product (BHmax) above Ferrite (Ferrite) more than 10 times. Machining properties of its itself is also quite good. Working temperature up to 200 degrees Celsius. And the quality of a material is solid, stable performance, good cost performance, so its application is very extensive. But because of its chemical activity is very strong, so you have to handle with coating on the surface layer. (such as zinc plating, Ni, electrophoresis, passivation, etc.

2.Ferrite magnets: it is the main raw material includes BaFe12O19 and SrFe12O19. Manufactured by ceramic technology, the quality of a material is hard, brittle material, because of the ferrite magnets have good temperature resistance, low cost, moderate performance, has become the most widely applied permanent magnets…..See category of ferrite magnet.

3.Alnico magnets: is made from aluminum, nickel, cobalt, iron and other trace metal elements. Casting process can make Alnico into different sizes and shapes, machinability is good. Casting aluminum nickel and cobalt permanent magnet has the lowest reversible temperature coefficient , working temperature can be as high as 600 degrees Celsius above. Alnico permanent magnet products are widely used in all kinds of instruments and meters and other application fields.

4.divided into SmCo5 and Sm2Co17. Because its material is expensive and make its development was restricted. Samarium cobalt (SmCo) as a rare earth permanent magnets, not only have higher magnetic energy product (14 to 28 MGOe), reliable, coercive force and good temperature characteristics. Compared with the ndfeb magnets, samarium cobalt magnet is more suitable for working in high temperature environment.

The production of NdFeB Magnets

wt2014 — Fri, 16 Jan 2015 15:45:04 +0000

The NdFeB magnets are manufactured with the alloy of Neodymium-Iron-Boron and small amount of added ingredients such as Dysprosium and Praseodymium, which can help increasing the corrosion resistance of the products. The actual chemical compositions differ with the actual magnet grades. An example of composition is given below:
Typical Composition of NdFeB Alloy
Neodymium(Nd):29% – 32%
Iron (Fe):64.2% – 68.5%
Boron (B):1.0% – 1.2%
Aluminum (Al):0.2% – 0.4%
Niobium (Nb):0.5% – 1%
Dysprosium (Dy):0.8% – 1.2%
The most common commercial NdFeB magnets are of the sintered type, which displays stronger magnetic force and better performance than other type. The general manufacturing process is shown as follows:
-Ore Separation/Refinement:
High purity Rare-earth oxides are separated and refined in electrolytic furnace.
-Raw Material Measurement:
Neodymium, Iron, Boron and other addictives are measured according to the preferred element composition.
-Melting to Create alloy In Furnace:
The measured elements are mixed and fed into the Vacuum Induction Furnace and melted into alloy.
-Alloy Pulverization into Fine Powder:
After the melting step, the obtained alloy is pulverized into fine powders that are several microns in size. In order to avoid oxidation, the small powders are protected by nitrogen and argon.
-Powder Press in Magnetic Field:
The powders are pressed into shape in a magnetic field to obtain a preferred magnetization direction. Through this process, we achieve magnetic anisotropy.
-Two methods of pressing exist: perpendicular pressing in a perpendicular magnetic field and parallel pressing in a parallel field. Given a certain grade of magnet, the perpendicular pressed magnet will has a higher performance than the parallel pressed one. However, ring magnets must be pressed with the parallel method.
-“Green” Magnet Sintering/Aging:
The pressed working piece receives heat treated in a sintering furnace. The density of the green magnet prior to sintering is about 50% of true density but after sintering, the density will be 100%. Through this process the magnet’s volume is reduced by about 50%.
-Final Machining and Plating:
In this step, the magnet gets the final machining and is also coated with Ni-Cu-Ni or or other plating.
-Magnetic Properties Inspection:
Key measurements include remnant flux density, coercivity, and maximum energy product. Only those magnets that pass the inspection are sent to subsequent processes including machining and assembly.

Rare earth magnets to be recycled in new EU research project

wt2014 — Fri, 16 Jan 2015 15:44:34 +0000

In response to the supply restrictions of rare earth metals, critical in many modern electronics, an international consortium has been brought together to identify new solutions to help with the demand from European industry.

One of the consortiums aims is to dramatically increase the amount of rare earth materials recovered and remanufactured from existing waste streams. The project brings together European industry and academia across the supply chain to develop the innovative technologies, business models and market information required to exploit this valuable resource reducing dependence on primary sources.
The partners will develop new and innovative processes for the recovery and recycling of neodymium iron boron magnets (NdFeB) from a range of waste electronic and electrical equipment (WEEE). Advanced sensing and mechanical separation techniques will be developed in combination with innovative processes to recover the rare earth magnets in the WEEE.
Significantly, the aim will be to recover material in a form that can easily re-enter the primary magnet manufacturing production route, so providing large energy savings and reduced production costs for European manufacturers.
The project, named “Remanence”, brings together Europe’s leading experts in sensing, disassembly, recycling technology and materials processing in a multi-disciplinary project able to deliver significant technical advances. C-Tech Innovation Ltd will lead the consortium, which also includes The University of Birmingham, Stena Technoworld AB, ACREO Swedish ICT AB, Leitat Technological Centre, OptiSort AB, Chalmers Industriteknik, Magneti Ljubljana and Kolektor Magnet Technology GmbH.
Remanence is funded by FP7, the Seventh European Framework Programme for research and technological development, and is expected to run until mid 2016

Rare earth permanent magnet generator

wt2014 — Fri, 16 Jan 2015 15:38:19 +0000

rare earth permanent magnet synchronous generator,aviation power supply

large capacity of rare earth permanent magnet synchronous generator for aviation power supply

At home and abroad has developed 500 ~ 2000 VA uav with rare earth permanent magnet synchronous generator series, 45 ~ 150 KVA onboard power supply system with large capacity of rare earth permanent magnet generator. In order to meet the demand of aviation power supply quality of the increasingly high standards, an adaptive compound excitation rare earth permanent magnet generator is attracting the attention of both at home and abroad. The generator is a blend of rare earth permanent magnet and the characteristics of electrical excitation generator has high efficiency and good capability of voltage adjustment.

2012 China’s rare earth situation and policy

wt2014 — Fri, 16 Jan 2015 15:33:49 +0000

Chinese government white paper on “China’s rare earth situation and policy”

China accounts for about 23% of the world’s total reserves of rare earth resources to undertake the supply of more than 90% of the world market

Published in 2012 by the Chinese government white paper on “China’s rare earth situation and policy”, points out that China accounts for about 23% of the world’s total reserves of rare earth resources to undertake the supply of more than 90% of the world market. At the same time, with abundant rare earth resources of the United States and other western countries, no exploitation of rare earth for themselves, but a large number of imports of rare earths from China. For this situation, many overseas analysts pointed out that it is not reasonable, sustainable market arrangement, need to adjust and change.

New energy car boost permanent magnet industry

wt2014 — Fri, 16 Jan 2015 15:30:52 +0000

what will be future new application of ndfeb permanent magnet, find latest news with vastsky magnet

global new energy vehicles development to bring growth of permanent magnet ndfeb industry

New energy car booster permanent magnet industry is growing rapidly. Ndfeb demand accounted for about 30% of new energy automobile production under the policy to promote there will be a process of rapid growth. Despite its scale, that need to be further mature technology, but in the global new energy vehicles under the situation of rapid development, rapid growth of domestic new energy vehicles will enter, and long-term investment value, the future demand for ndfeb will exceed 30%.

Wireless charging layout promote magnets application

wt2014 — Fri, 16 Jan 2015 15:27:55 +0000

a new wireless charging solutions announced by Freescale will drive the magnetic material consumption

Freescale, the semiconductor manufacturers in the United States, announced a new wireless charging solutions which make the users step closer to wireless Internet of the future. Starbucks has actively layout wireless charging in silicon valley and Beijing. These will drive the magnetic material consumption, and rare earth is the important material in the manufacture of the magnets.

According to foreign media reported on December 9, 2014 Freescale semiconductor manufacturers in the United States announced a new wireless charging solutions, the product of 15 watts, can provide mobile phone charge three times the power, products, easy to carry, and can be layout to all aspects of people’s life, such as airplane seat, a coffee shop and the dining room table and so on. The product is expected to go on sale in early 2015. The solution for dressing equipment, tablet, big screen smartphones and portable industrial and medical equipment and other large super fast wireless charging of mobile devices, paving the way for the user to step closer to the wireless Internet of the future.

In 2013, the first two stores in silicon valley has brought the wireless charging for the user. Users at the time of drinking coffee, as long as their phones in preset good wireless charger on the table, can support wireless charging of mobile phone recharged for himself. By mid – 2013, starbucks, McDonald’s and companies such as AT&T in America’s big airport, coffee shop, shopping center, and the stadium has deployed more than 1500 charging point. In Europe, PowerKiss already in airport, hotel and coffee shop supervision and installed more than 1000 charging point. Starbucks also has 200 stores in San Francisco bay area set up wireless charging stations. At the Beijing capital airport now in terminal 3 C, and D all are equipped with wireless charging pile near the gate, will be one by one.

In 2015, from the first generation of inductance to the second generation of magnetic resonance (NMR) technology will promote the development of wireless charging into the mainstream products, coffee shops, airports, restaurants and movie theaters and other places of wireless charging stations will be even more popular. With perfect ecological system gradually established, will further stimulate consumer demand for wireless charging, and is expected in the next year there will be a formal commercial wireless charging product.

So what is the working principle of magnetic resonance (NMR) wireless charging technology? According to introducion, it is to use the principle of nuclear magnetic induction charging equipment, similar to the transformer, the sending and receiving end each have a coil, the sender coil connection cable power signal, the receiver coil induction send the electromagnetic signal to generate an electric current to electric equipment. Wireless charging products mainly have three key components, including the control circuit board, induction coil, magnetic materials. In the process, magnetic materials play an important role. According to TDK wireless charging product related technical chief introduction, Permanent magnetic material itself and the process layout has a very important influence for the efficiency of wireless charging. In China, some of the biggest magnetic material manufacturers have been making magnets for wireless charing products.

NdFeB irregular magnet

wt2014 — Tue, 13 Jan 2015 22:14:44 +0000

Magnetic shelf

wt2014 — Mon, 08 Dec 2014 22:09:23 +0000

Material:NdFeB Magnetic material
Size:as your request
Magnetic properties:Hcj,Hcb,BH,Br,BHmax,working temperature
Magnetization directions:by Axial

We customize different types of magnetic shelf with rubber coating according to customers’ requirements,drawing or actual samples,magnet grade as your choice.

What is your requirements about:

Size
Magnet grade/Magnetic properties(Hcj,Hcb,Br,BHmax,working temperature)
Coating
Tolerance
Magnetization direction
Purchase quantity
Drawing or actural samples
Other requests(packing,shipping,label etc)

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