permanent magnets – Neodymium Rare Earth Magnets World

7 Applications of Neodymium Magnets

Neodymium magnet is one type of rare earth magnets which can be seen in many daily goods including headset, voice coil motor, guitars, speakers, Halbach array, cordless tools and even hybrid vehicles.
1. Magnetic pull bait plate
Fishing is so popular. There are special fishing TV stations introducing different fishing contest, fishing tips and fishing tackle. I am sure it’s one of the best-loved hobbies all over the world. Have you ever heard magnetic pull bait plate? It’s a fishing tool to adsorb fishhook for easy bait.

2. Magnetic scrubber
Permanent magnets are widely used in aquarium cleaner because you don’t have to empty the tank or touch water any more. This also applies to narrow shape vast or glass door/window.
3. Magnetic gun mount
As all guns have something in common – metal, permanent magnets are ideal for building the gun mount. Use cheap big block ceramic magnets to build a gun mount, instead of small super-strong neodymium magnets or you can find free neodymium magnet in an abandoned computer hard drive.

4. Magnetic beer buff opener
Small beer bottle caps are everywhere when you have fun with friends? Easy in assembly, magnetic bottle opener, can hold dozens of or even hundreds of caps a time.
5. Magnetic screen door
When summer comes, how to keep annoying mosquito or bug out is a big problem for many families, especially for those family that has baby. The magnetic mesh hands-free screen door curtains are the perfect solution to this problem; they are environmental protection without the use of pesticides and allow fresh air in.
6. Magnetic jar holders
If you have many small things taking up room in your cabinets and drawers, and don’t have extra space to hold more things, let’s use magnetic jar.

7. Magnetic hanger
If you are a neat freaks and want everything in order, you’ll love this modern magnetic clothes hangers. These hook-free hangers make it easier to organize your closet.

For more information, please visit https://www.stanfordmagnets.com/

Applications of High Performance NdFeB Permanent Magnet Materials

In the rare earth functional materials industry, high-performance neodymium permanent magnets are mainly used. Neodymium magnets are mainly used in high-end applications such as new energy and energy-saving and environmental protection, such as EPS, new energy vehicles and so on.
With the technological innovation of the automobile industry and the demand of energy saving and environmental protection, electric or hybrid vehicles with low energy consumption, low noise and low exhaust gas have become the goal of everyone. Bonded Nd-Fe-B magnets have the advantages of high magnetic properties, small size, and high efficiency. The motor using Nd-Fe-B magnets has 8-50% higher efficiency, 10% lower power consumption and 30% lower volume and weight. The development of the automobile is miniaturization, lightweight, high performance, and energy saving and environmental protection.

In addition, bonded neodymium magnets are mainly used in micro-motors and sensors of medium and high-grade vehicles. Each medium and high-grade and luxury car uses 50-80 micro-motors, some even up to 100, with an average of at least 60. For example, the seat motor, window motor, wiper motor, EPS power steering sensor, magnet rotor, onboard CD or hard disk and so on, with the development of automobile to comfort, energy-saving and automation, the neodymium magnet used in automobile motor will increase.
In addition to automotive applications, hard disk drives have the high application of bonded NdFeB. The world has entered the information age. The improvement and development of magnetic storage technology and hard disk drive technology will certainly bring about the development of large data storage industry, and the global demand for hard disk will remain stable. And the development of cloud computing has a higher requirement for massive data, massive storage and massive management of computers. As an important medium of magnetic storage technology, the hard disk is one of the most important data storage methods. It will develop with the development of cloud computing. This will bring a large market for bonded neodymium magnets for the hard disk.
Moreover, the emergence of ultra-thin hard drives brings new opportunities for bonded neodymium magnets. To counter the impact of SSDs, several of the world’s largest hard disk manufacturers are planning to develop ultra-thin hard disks to meet the increasing popularity of the tablet computer market demand, the development of ultra-thin hard disks will bring new opportunities for hard disk magnets.

With the rapid development of modern science and technology, we have experienced the full progress of all walks of life in the enjoyment of the rapid development of science and technology, but also in all walks of life can improve the efficiency of the method. No matter how the development of science and technology, our life and work are inseparable from the motor, it is natural to use motor tiles. So the development of magnetic tile in science and technology is also very important.
Every day we work off the means of transportation, the need to drive the motor vehicle movement, the motor in the shoulder of energy conversion at the same time also shoulder the efficiency and safety and other tasks. Among them, the motor magnetic tile is also very important. According to the actual needs, the magnetic tile has a variety of shapes and styles.
Modern tiles are made of permanent magnets, on the one hand, the magnetism will not disappear, basically achieving permanent use. You can assume that if it’s not a permanent magnet, if there’s a loss of magnetism or a loss of magnetism in the process of application, the consequences can be imagined, not much impact and damage, but a car or an aircraft is the entirely different concept.
In addition, the magnetic tile is now required to be able to withstand high temperature, if the motor heating caused damage to the magnetic tile, also in some heavy industry or high-tech areas will cause inestimable losses, so the more important our motor tile is, the more need to ensure its safety and performance. Of course, in today’s high-tech, the industry has been very standardized, magnetic tile development has been able to meet the needs of industry development.

Are Neodymium Magnets Stronger Than Ceramic Magnets?

In general, the magnetic induction near permanent magnets (AlNiCo alloy magnets, ferrite magnets, etc.) is about 0.4-0.7 tesla.

But rare earth magnets (neodymium magnets, samarium cobalt magnets) can produce a magnetic field of more than 1.4 tesla, is much larger than the usual Al-Ni-Co or ferrite magnets.

Among permanent magnets, rare earth magnets produce the greatest magnetic field, which is much larger than aluminum-nickel-cobalt magnets or ferrite magnets. Rare earth magnets generally produce a magnetic field of more than 1.4 teslas, whereas ferrite or ceramic magnets produce only about 0.5 to 1 tesla. Two of the most common rare earth magnets are: neodymium magnet and Nd-Co magnet. The two magnets contain Nd and Sm in rare earth elements, respectively. Rare earth magnets are very brittle and vulnerable to corrosion, so they are usually coated with other metals to protect themselves.

The Ferrite permanent magnet is also known as a Ceramic Magnet and even as hard ferrite magnet. The name is interchangeable but they all refer to exactly the same material type. They are known as Ceramic Magnets because they are electrically insulating. Ferrite permanent magnets exist in two forms – Strontium Ferrite magnets and Barium Ferrite Magnets. The Strontium Ferrite Magnets is the most common.

Ferrite magnets are darker grey in color and are often referred to as having a “pencil lead” appearance.

Ferrite / Ceramic permanent magnets are technically known as hard ferrite materials (when exposed to a brief external magnetic field, the material retains magnetism due to having high coercivity, Hc). They are not the same as soft ferrite materials as used in transformer cores (which do not retain magnetism after exposure to a brief magnetic field because soft ferrite materials have low coercivity). The high coercive force of Ferrite Magnets means they are classified as hard materials, like all the other permanent magnets.

Ferrite magnets are extremely popular due to their characteristics. Ferrite magnets are corrosion free – for the long-term performance they are superb; if looked after they are capable of exceeding most products lifecycles. Ferrite magnets can be used up to +250 degrees C (and in some cases up to +300 deg C). Ferrite magnets are also low cost, particularly in high volume production runs.

How to Choose High-quality NdFeB Magnets?

The sintered NdFeB permanent magnets of 1cm 3 will be oxidized and corroded when they are left in air at 150 C for 51 days. It is easier to be corroded in weak acid solution. In order to make Nd-Fe-B permanent magnet durable, it is required to have 20-30 years of service life, it must undergo surface anti-corrosion treatment, in order to resist corrosive medium on the magnet corrosion damage. Nowadays, sintered Nd-Fe-B manufacturers generally adopt plating metal, plating + electroless metal, electrophoretic coating and phosphating treatment to coat the magnet surface with an additional layer of isolation, separating the magnet surface from the corrosive medium, in order to prevent the damage of the medium to the magnet.

Manufacturers generally zinc plating, nickel plating + copper + nickel, nickel plating + copper + electroless nickel plating three main processes, other metal plating requirements, are generally applied after nickel plating with other metal plating.

2, in some special cases, phosphating can also be used:

(1) Phosphating is simple and easy to use when the NdFeB magnet product is not clear about the subsequent surface treatment method because of its turnover, long storage time;

(2) When the magnet needs epoxy bonding, painting, etc., the adhesive force of epoxy organics such as glue and paint needs the matrix to have the very good invasion performance. The phosphating process can improve the penetration ability of the magnet surface.

(3) Electrophoretic coating has become one of the most widely used anticorrosive surface treatment technologies. Because it not only has good adhesion with the surface of porous magnet, but also has salt spray resistance, acid resistance, alkali resistance and other corrosion resistance, excellent corrosion resistance. But compared with spray coating, it has poor moisture and heat resistance.

Customers can choose coatings according to their product requirements. With the expansion of the field of motor application, customers have higher requirements for the corrosion resistance of NdFeB. The HAST test (also known as PCT test) is specially designed to test the corrosion resistance of sintered neodymium permanent magnets in humid and high temperature environment.

And how do customers determine whether the coating meets the requirements?

The purpose of salt spray test carried out by Nd-Fe-B manufacturer is to do fast corrosion protection test on sintered neodymium magnet with anti-corrosion coating. At the end of the test, the sample is taken out from the test box and dried. The color change of the box with or without speckles and speckle area on the surface of the sample is observed by eyes or magnifying glass.

Why do neodymium magnets appear rust spots and how to avoid them?

After a period of time, the surface of neodymium magnet will appear white or other colors of spots, slowly develop into rust spots, under normal circumstances, electroplated magnet coating is not easy to appear rust spots, rust spots generally occur due to the following reasons:

Magnets are stored in damp, airtight, and temperature changing areas.
The dirt on the surface of the magnet before plating is not well cleaned.
Plating time is not enough or process problems.
The magnetic oxidation of the magnet caused by the breakage of the packaging seal.

Under normal conditions, rust stains should not appear on the surface of magnet electroplating coatings. NdFeB magnet should avoid the following safekeeping methods:

In areas with excessive humidity and poor air circulation, rust stains may occur even when the temperature difference varies considerably, even if the salt spray test qualified products are stored in harsh environments for a long time. When the electroplated products are stored in harsh environment, the further reaction between the base layer and the condensate will result in the reduction of the adhesion between the base layer and the coating, and in serious cases, it will also cause local powdering of the substrate, and then natural peeling. Electroplating products should not be placed in a high humidity area for a long time. They should be placed in a cool and dry place.

For more information, please visit https://www.usneodymiummagnets.com/

How are Permanent Magnets Made?

Today, mobile phones, headsets, and other devices are made so small that they can’t be separated from high-performance permanent magnets. So how are these magnets made? Can we find more powerful magnets?
“Magnet”, the scientific term is called a permanent magnet, which is different from the electrified magnet. It’s the core of many modern technologies. Speakers in compact devices such as cell phones and headphones require permanent magnets to convert current signals into sound signals. With super permanent magnets, they can now be so compact. In addition, electric vehicles, turbines, computers, satellites, and so on, all require permanent magnets to convert electrical and mechanical energy into each other.

So how are permanent magnets made?
It is not difficult to make a permanent magnet. Electromagnetism tells us that the movement of electric charge produces the magnetic field, which can make the charge move. So permanent magnets play a central role in electric motors, generators, and transformers. There, they store energy or transform mechanical energy and electrical energy into one another. These devices are still playing a great role in our daily life.

Rare earth permanent magnet material debut
It is so simple to make a permanent magnet, but it is not easy to make a good permanent magnet. There are many materials used to make permanent magnets. We can make a long list. The most used is ferrite, because it is relatively cheap, and its corrosion resistance is also unmatched. But it has a fatal flaw: magnetism is not strong enough. In order to produce a strong magnetic field, you need a lot of amazing ferrites. So devices containing ferrite magnets are generally large and bulky.
It is certainly not a problem for large mechanical devices, but in this age of microelectronics, we need smaller things, which require more magnetic permanent magnets. But how do you get it? In a solid material, the number of electrons is too large for theoretical calculations, so it is difficult for theorists to give guidance. In this case, the search for better permanent magnets depends largely on metallurgists’experiments: mixing promising elements into an external magnetic field to see what happens.
In this way, the magnetism of the AlCoNi magnet developed in the 1930s is almost double that of the best ferrite magnets. But in this area, a series of breakthroughs occurred after the 1970s, an excellent material for making permanent magnets, were discovered.
Rare earth elements are also known as lanthanides in the periodic table, with atomic numbers ranging from 57 to 71. Important rare earth elements include rubidium (Nd) of atomic number 60, samarium (Sm) of 62 and dysprosium (Dy) of 66. One of the characteristics of these elements is that there are so many electrons in their atoms that spin in the same direction. In the 1970s, cobalt and samarium were mixed in proportion to form permanent magnets, which were found to be twice as magnetic as aluminum cobalt nickel permanent magnets.

The most dazzling star in permanent magnets
Nevertheless, an incomparable star in permanent magnets is the NdFeB permanent magnet (Neo magnet). In the 1990s, this permanent magnet, at equal distances, was thousands of times stronger than the magnetic field produced by the Earth’s liquid iron core. You know, the average distance between the earth’s surface and the liquid iron core that produces a magnetic field on the earth is 2900 kilometers, which means that the magnetism of the Neo permanent magnet is thousands of times stronger than that of the earth’s magnetic field.
At room temperature, Neo magnet is the most powerful permanent magnet.