Can We Really Use Rare Earth Magnets Outdoors

Rare magnets are made of compounds fitting in with the lanthanide gathering of components. Samarium (Sm) and Neodymium (Nd) are two of the most far-reaching Lanthanide components utilized as a part of the handling of rare magnets.

Lanthanide components are ferromagnetic metals. This implies that they the ability to be charged much the same as iron. Be that as it may, their Curie temperatures (the temperature at which they lose their attraction) are generally underneath the ordinary room temperature. This clarifies why rare magnets are not suitable for outside utilization. In most cases, open air temperatures are typically higher than room temperatures. This prompts demagnetization of the magnet and consequent waste. Hence, the utilization of rare earth magnets in the outside environment is not prudent.

neo magnets applications

NdFeB magnets are made up of a compound of neodymium, iron, and boron (Nd2fe14b). They are the most strong and financially savvy sort of rare earth magnets. These magnets have comparative properties to Samarium Cobalt rare earth material aside from, that they are effortlessly oxidized.

This implies that Nd2fe14b magnets have an affinity for erosion. The Fe some piece of their name speaks to iron and iron is a standout amongst the most consumption inclined metals. Then again, this issue is not difficult to manage. Various defensive surface medicine systems, for example, nickel, zinc, gold and tin plating give the essential consumption insurance as and when needed. Epoxy tar covering is an alternate defensive surface medication system that is additionally truly regular.

These surface medication systems guarantee that attractive material does not experience dampness. Notwithstanding, if the covering endures any manifestation of harm, moistness or water may experience the attractive material underneath and reason rusting. NdFeB magnets have one of the most noteworthy vitality items. Subsequently, they are mechanically stronger than Samarium based magnets. Their high-vitality item makes them suitable for creative provisions that oblige a conservative outline and low assembling expenses.

Other helpful aspects of these magnets could be their exorbitant coercive power and normal temperature strength. Much the same as whatever viable material that exists on earth, NdFeB magnets have their own particular detriments. This incorporates low imperviousness to erosion when crudely plated or covered and low mechanical quality.

Rare magnets are connected with tremendous engaging strengths. This characteristic accompanies its own particular novel risks.

Rare earth magnets that have measurements of barely a couple of centimeters have the potential of bringing about genuine real damages. This is particularly thus if a body part gets trapped amidst the two magnets. In a few occasions, these magnets have even brought about broken bones. That is the way influential rare earth magnets might be.

Anything You Should Know About NdFeB magnets

1. What are the applications of Nd-Fe-B magnets?

Neodymium permanent magnets are rapidly developing and widely used because of their excellent properties, abundant raw materials, and reasonable prices. It is mainly used in micro-motor, permanent magnet instrument, electronic industry, automobile industry, petrochemical industry, nuclear magnetic resonance device, sensors, Halbach Arrays, audio equipment, magnetic levitation system, the magnetic transmission mechanism, and magnetic therapy equipment.

magnetism neodymium magnet

2. What materials are NdFeB made of?

The main materials of the Nd-Fe-B permanent magnet are rare earth metal Nd (32%), metal element Fe (64%) and non-metal element B (1%) (a small amount of Dy, Tb, Co, Nb, Ga, Al, Cu, etc.). Neodymium ternary permanent magnets are based on Nd2Fe14B compound, whose composition should be similar to that of Nd2Fe14B compound. However, when the composition of Nd2Fe14B is completely proportioned, the magnetic properties of the magnet are very low, even no magnetism. It is only when the content of Nd and B in the actual magnet is more than that of the Nd2Fe14B compound that better permanent magnet performance can be obtained.

3. How long can the magnetic properties of NdFeB last?

Neodymium magnets have high coercivity, and there will be no demagnetization and magnetic changes in the natural environment and general magnetic field conditions. Assuming that the environment is suitable, the magnetic properties of the magnet will not be greatly damaged even after a long time of use. So in practical applications, we often neglect the influence of time factor on magnetic properties.

4. What is the direction of the rare earth magnet?

The direction in which the magnet with anisotropic orientation can obtain the best magnetic properties is called the orientation direction of the magnet. The magnet is divided into:

a. Isotropic magnets: magnets with the same magnetic properties in any direction

b. Anisotropic magnets: The magnetic properties will be different in different directions, and there is a direction, i.e. orientation direction, in which the magnets with the highest magnetic properties are obtained. Sintered NdFeB permanent magnets are anisotropic magnets, so it is necessary to determine the orientation (magnetizing direction) before production.

5. Factors affecting the magnetism of neodymium magnets

Because sintered NdFeB is very sensitive to working temperature, the instantaneous maximum temperature and the continuous maximum temperature of the environment may produce different degrees of demagnetization for magnets, including reversible and irreversible, recoverable and irreversible.

6. What is the working temperature range of neodymium magnets?

Temperature limitation of Nd-Fe-B magnets has led to the development of a series of grades of magnets to meet different operating temperature requirements. Please refer to our performance catalog to compare the operating temperature ranges of different grades of magnets. It is necessary to confirm the maximum operating temperature before selecting neodymium magnets.

What Neodymium Magnets Used For

Neodymium magnet is a permanent magnet material based on intermetallic compound Nd2Fe14B. NdFeB permanent magnets have been widely used in modern industry and electronic technology due to their high magnetic energy product and coercivity, and high energy density, which makes it possible to make instruments, electroacoustic motors, magnetic separation, and magnetization equipment small, lightweight and thin.

Neodymium has the advantages of high-cost performance and good mechanical properties; the disadvantages are low Curie temperature point, poor temperature characteristics, and easy to pulverize and corrode. It must be improved by adjusting its chemical composition and adopting surface treatment methods to meet the requirements of the practical application.

The sintered NdFeB permanent magnets are made by powder metallurgy. The melted alloy is made into powder and pressed into compacted embryos in the magnetic field. The compacted embryos are sintered in inert gas or vacuum to achieve densification. In order to improve the coercivity of magnets, aging heat treatment is usually needed.

permanent magnets

Applications of neodymium magnets

At present, the main application fields are permanent magnet rotor, generator, nuclear magnetic resonance imager, magnetic separator, acoustic loudspeaker, magnetic levitation system, magnetic drive, magnetic lifting, instruments and meters, liquid magnetization, special-shaped magnet magnetotherapy equipment and so on. It has become automobile manufacturing, general machinery, petrochemical, electronic information industry.

Comparison between NdFeB and other permanent magnets

NdFeB permanent magnet is the strongest permanent magnet in the world at present. The magnetic energy product of special-shaped magnet is ten times higher than that of ferrite, about twice as high as that of the first and second generation rare earth magnets (samarium-cobalt permanent magnet), and is known as “the king of permanent magnets”. Instead of other permanent magnets, It can double the volume and weight of the device. Because of the abundant neodymium resources, compared with the samarium-cobalt permanent magnet, the special-shaped magnet replaces the expensive cobalt with iron, which makes the products cheap in price and good in quality, so it has been widely used.

magnet rotor

The principle of ferromagnetic NdFeB

1. Ferromagnetic materials such as iron, cobalt, nickel or ferrite are different. The electron spins in them can be arranged spontaneously in a small range to form a spontaneous magnetization region, which is called a magnetic domain. Ferromagnetic materials after magnetization, the internal magnetic domains neatly arranged in the same direction, so that the magnetism is strengthened, constituting a magnet. The magnet’s absorption process is the magnetization process of the iron block. The magnetized iron block and the magnet produce attraction between different polarities, and the iron block is firmly attached to the magnet.

2. Matter is mostly made up of molecules, molecules are made up of atoms, and atoms are made up of nuclei and electrons. Inside the atom, electrons spin and revolve around the nucleus. These two motions of electrons generate magnetism. But in most substances, electrons move in different directions, in disorder, and the magnetic effects cancel each other out. Therefore, most substances do not exhibit magnetism in normal conditions.

3. Determined by the characteristics of the magnet, if interpreted by the atomic current, it is the magnetic field generated by the current magnetizing other objects, magnetizing objects produce an electric field, then the electric field has interaction force.