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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