Friday, February 14, 2014

Attention to the problem before ordering magnets

One is so that we can more effectively with your work , we need you to confirm the following before placing your order :
1 what kind of material , performance ?
2 dimensions and tolerances ?
3 Do you want magnetizing ? If needed, what kind of magnetizing , axial, radial ?
4 Maximum temperature magnets work environment ?
5 Quantity ?
6 surface treatment ? Zinc, nickel ?

Two NdFeB magnets which application ?
NdFeB permanent magnet with its excellent performance , abundant raw material and reasonable prices are to the rapid development and wide application . Its main applications in micro motors, permanent magnet instrument , electronic industry, automobile industry , petrochemicals, nuclear magnetic resonance devices, sensors , audio equipment , magnetic suspension system, magnetic transmission and magnetic equipment.

Three magnetic analogy
Performance and low ferrite , the lowest price, good temperature characteristics , corrosion resistance, good cost performance
NdFeB highest performance, price , and strength, not high temperature and corrosion
SmCo high performance, highest price , crisp, excellent temperature characteristics , corrosion
Alnico performance and low in price , excellent temperature characteristics, corrosion resistance, differential interference
SmCo, ferrite, NdFeB sintered and bonded available method for manufacturing a high magnetic sintered molding poor moldability of the bonded magnet is good , much lower performance.
AlNiCo available manufacturing methods of casting and sintering , casting high performance magnet , good moldability is poor , the sintered magnet is low , the moldability is good.

Four of those NdFeB material ?
The main raw material NdFeB permanent magnets are rare earth metal neodymium (Nd) 32%, a metal element iron (Fe) 64% non-metallic elements and boron (B) 1% ( small amount of dysprosium (Dy), terbium (Tb), cobalt (Co), niobium (Nb), gallium (Ga), aluminum (Al), copper (Cu) and other elements ) . NdFeB permanent magnet materials based on Nd2Fe14B ternary compounds as substrates , its composition should be similar to the compounds Nd2Fe14B formula . But exactly Nd2Fe14B composition ratio , the magnets can be very low, or even non-magnetic . But the actual content of neodymium and boron magnets were neodymium and boron content than Nd2Fe14B compound for a long time to get better magnetic properties .

Five NdFeB magnetic energy can last long ?
NdFeB magnets have a very high coercivity and magnetic demagnetization will not change the natural environment and the general magnetic field . Assuming proper environment , even after prolonged use , the magnetic energy loss will not be great magnet . So in practical applications , we tend to ignore the impact of time on the magnetic properties .

Six on the orientation direction
Orientation direction : the direction of the anisotropic magnet can obtain optimum magnetic properties of the magnet is referred to as the orientation direction . Magnets are divided into : 1 , isotropic magnets : the same in any direction magnetic magnets
2, the magnetic anisotropy : the magnetic properties will be different in different directions ; orientation and direction, i.e. there is a direction of the resultant magnet highest when the direction of magnetic orientation . Sintered NdFeB magnets are anisotropic , and therefore need to determine the orientation of the pre-production direction ( magnetization direction ) .

Seven factors NdFeB magnet magnetic ?
Ambient temperature , the sintered ndfeb magnets extremely sensitive to temperature , the instantaneous temperature of the environment and the maximum temperature may be continued to produce different degrees of demagnetization of the magnet , including the reversible and irreversible , reversible and irreversible .

Eight NdFeB magnets operating temperature range is what ?
NdFeB magnets temperature limits sparked the development of a series of magnets to adapt to different levels of temperature requirements, please refer to our catalog compare the performance of each grade magnet operating temperature range. Before selecting NdFeB magnets need to confirm the maximum operating temperature .

Nine how to shield the magnetic field ?
Generally, we use an ordinary iron magnetic shield . High permeability magnetic shield materials need to meet this requirement is an iron -nickel alloy material , a material having a high magnetic permeability . When you need to shield the magnetic field is strong, with only a single layer shielding materials, shielding requirements not reach that saturation will occur. In this case , a method is to increase the thickness of the material . However, more effective method is to use a combination of shielding, a shielding member on the other shielding body , leaving an air gap between them. You can fill any non- permeability material support to make the gap , such as aluminum . Combination of shielding shielding effectiveness is much higher than a single shield , so a combination of magnetic shielding can be attenuated to a very low level .

Ten magnets to store and transport What precautions ?
Magnet in storage to keep indoor air dry, or wet environment tends to rust magnet . Ambient temperature should not exceed the maximum operating temperature of the magnet ; storage when not in electroplating products can be properly oiled rust ; magnetizing products should be stored away from the disk , magnetic tape , computer monitors , watches and other objects sensitive to magnetic fields . Magnet material more brittle , transportation , plating ( coating ) , the installation process should ensure that the magnets are not violent impact, if improper , may cause magnetic damaged, cracked ; magnet when the magnetization state should be shielded transport , especially aviation transportation must be completely shielded.

Eleven magnet operation What precautions ?
Magnet in the course should ensure that the workplace clean, otherwise easily absorbed iron and other magnetic effects of the use of small particles ; NdFeB material is characterized by a hard and brittle , and its suction up to 600 times its own weight , easy to pull collision damage . For the small size of the operation should be taken to avoid damage bump , for the large size is more important to note that personal safety and protection.

What is the reason and the second coating peeling rust is the reason ?
Qualified electroplating products, under normal circumstances , the coating should not rust appears plating . In too wet , poor air circulation , temperature change is large, even the salt spray test qualified products under long-term storage in harsh environments are likely to produce rust . When plating products stored in harsh environments environment , the basal layer and further condensation reaction will cause the binding force of the basal layer of the coating decreases, will result in serious localized chalking substrates , thus naturally from the skin . Electroplating product should not be placed in long-term high humidity areas, and shall be placed in a cool, dry place.

How to measure the magnetic properties of thirteen level ?
There are three main parameters : remanence Br (Residual Induction), units of Gauss, remove from the saturation magnetic flux density of the remaining representatives of the external magnet field strength can provide ; coercive force Hc (Coercive Force), the unit Oersteds, is put in a reverse magnetic field of the magnet , when the intensity of the applied magnetic field to a magnet disappears , the resistance to the applied magnetic materials
field is referred to as the coercive force and represents a measure of anti -demagnetization ; magnetic product BHmax, unit Gauss-Oersteds, the magnetic energy is produced per unit volume of material , the magnet can be a physical quantity of stored energy .

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