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Product introduction of neodymium iron boron magnetic steel:
Neodymium iron boron permanent magnet material was introduced in the early 1980s and is now widely used in products such as motor speakers, toys, mobile phone speakers, mining equipment, nuclear magnetic resonance permanent magnet motors, etc. The composition is Nd2Fe14B Having extremely high magnetic properties, its maximum magnetic energy product [BHmax] is higher than that of ferrite.
How to make your magnetic machine last longer
1、 Pre operation inspection: 1.1 Whether the contact between the discharge scraper and the surface of the cylinder is normal; 1.2 Whether the oil level in the bearing and reducer is appropriate; 1.3 Check for any looseness of bolts; 1.4 Check if the power supply is faulty; Is there any object inside the 1.5 groove that hinders operation.
2、 Reasons and prevention methods for rust spots on neodymium iron boron strong magnets
After being placed for a period of time, neodymium iron boron strong magnets will show white or other colored spots on the surface, which gradually develop into rust spots. Under normal circumstances, the electroplating magnet coating is not prone to rust spots, and the reasons for rust spots are generally as follows:
1. Magnets should be stored in damp, poorly ventilated, and temperature sensitive areas;
2. The dirt on the surface of the magnet before electroplating was not well cleaned;
3. Insufficient electroplating time or process issues;
4. Magnet oxidation caused by damage to the packaging seal of the magnet;
The qualified electroplating product of neodymium iron boron strong magnet should not have rust spots on the surface of the magnet electroplating coating under normal circumstances.
The following storage methods should be avoided for neodymium iron boron strong magnets:
In places that are too humid and have poor air circulation; When the temperature difference changes significantly, even products that pass the salt spray test may produce rust spots when stored in harsh environments for a long time. When electroplating products are stored in harsh environments, the substrate layer further reacts with condensed water, resulting in a decrease in the bonding force between the substrate layer and the coating. In severe cases, it can also cause local powdering of the substrate, leading to natural peeling. Electroplated products should not be stored in high humidity areas for a long time, but should be placed in a cool and dry place.
Introduction to the characteristics and processing technology of neodymium iron boron magnets:
Neodymium iron boron magnetic materials, as the latest result of the development of rare earth permanent magnet materials, are known as the "magnetic king" due to their excellent magnetic properties. Neodymium iron boron magnetic materials are alloys of neodymium, iron oxide, etc. Also known as magnetic steel. Neodymium iron boron has extremely high magnetic energy product and coercive force, and the advantages of high energy density have made neodymium iron boron permanent magnet materials widely used in modern industry and electronic technology, making it possible to miniaturize, lighten, and thin equipment such as instruments, electro-acoustic motors, magnetic separation and magnetization. The advantages of neodymium iron boron are high cost-effectiveness and good mechanical properties; The disadvantage lies in the low Curie temperature point, poor temperature characteristics, and easy pulverization corrosion. It must be improved by adjusting its chemical composition and adopting surface treatment methods to meet the requirements of practical applications.
The third-generation rare earth permanent magnet neodymium iron boron is the most powerful permanent magnet among contemporary magnets. Its main raw materials include rare earth metal neodymium 29% -32.5% metal element iron 63.95% -68.65% non-metallic element boron 1.1-1.2%, with a small amount of dysprosium 0.6-1.2% niobium 0.3-0.5% aluminum 0.3-0.5% copper 0.05-0.15% and other elements added.
Neodymium iron boron permanent magnet material is a permanent magnet material based on the intermetallic compound RE2FE14B. The main components are rare earth (Re), iron (Fe), and boron (B). In order to obtain different properties, rare earth ND can be partially replaced by other rare earth metals such as dysprosium (Dy) and praseodymium (Pr), and iron can also be partially replaced by other metals such as cobalt (Co) and aluminum (Al). The content of boron is small, but it plays an important role in the formation of tetragonal crystal structure intermetallic compounds, making the compounds have high saturation magnetization, high uniaxial anisotropy and high Curie temperature.
Process flow: batching → melting and ingot making/strip throwing → powder making → molding → sintering and tempering → magnetic testing → grinding processing → pin cutting processing → electroplating → finished product. The ingredients are the foundation, and sintering and tempering are the key.
Production tools and performance testing tools for Nd-Fe-B magnet blanks: smelting furnace, belt throwing furnace, jaw crusher, air flow mill, press forming machine, vacuum packaging machine, isostatic press, sintering furnace, heat treatment Vacuum furnace, magnetic property tester, Gauss meter. Neodymium iron boron magnet machining tools: centerless grinding, rounding machine, double end grinding, flat grinding, slicing machine, double-sided grinding, wire cutting, Tianjin high-speed, Xihu platform drilling, irregular grinding, etc.
Introduction to the magnetic therapy effect of neodymium iron boron magnets:
1、 Magnetized water in history
Magnetic force is one of the four fundamental forces in nature. The compass, one of the the Four Great Inventions in ancient China, is an example of the ingenious application of magnetic force. Li Shizhen, a medical expert from the Ming Dynasty, discovered five hundred years ago that water treated with magnetic force had effects such as "removing sores and fistula, growing skin", "drinking for a long time makes people have children, suitable for drinking alcohol", and "strengthening yang" (see pages 583-586 of the Compendium of Materia Medica), which can strengthen the body and treat various diseases. However, the magnetic material used by the ancients was natural magnetite - magnetite, whose magnetic properties were very low compared with modern synthetic magnetic materials.
2、 High strength magnetic king - neodymium iron boron
In 1983, the third generation neodymium iron boron Na-Fe-B was introduced, with a magnetic field strength more than ten times that of ordinary magnets and a service life of over ten years. It is the highest magnetic energy product (MGOE) permanent magnet material discovered by human society to date and is known as the "King of Permanent Magnets". It is widely used in national defense, space technology, microwave, communication, electronics, medical care and other high-tech fields.
3、 The working principle of scale removal and prevention of neodymium iron boron
After water is subjected to high-strength magnetization treatment with neodymium iron boron, the angle and length of the water molecular bonds undergo deformation simultaneously. The hydrogen bond angle decreases from 105 degrees to about 103 degrees, causing a series of changes in the physical and chemical properties of water. The activity and solubility of water are greatly improved, and the calcium carbonate in water decomposes during the cooking process to form lower and softer calcium bicarbonate, which is not easy to accumulate on the wall and is easily carried away by water. In addition, the polymerization degree of water increases, and the dissolved solid matter becomes finer particles. After particle refinement, the distance between the two ions is smaller, making it difficult to condense on the wall, thus achieving the effect of scale removal.
4、 The principle of disease prevention and health care of neodymium iron boron
Due to differences in geographical environment and mineral content in water, harmful substances in water greatly affect our lives and health. Calcium and magnesium salts in water are insoluble and affect the absorption and photosynthesis of animals and plants. Numerous practical and scientific experiments have shown that high strength magnetization of neodymium iron boron can change the surface tension, density, solubility and other physical properties of water, and have a significant impact on chemical properties such as acidity and alkalinity. Magnetized water can increase the activity of enzymes in water and the permeability of biofilms. Drinking it regularly can strengthen physical health, regulate the microcirculation and digestive system of the human body Endocrine system and neurological function, improving human immunity, preventing and treating various diseases.
After high intensity magnetization, water molecules are activated and have a high oxygen content:
1. Regular drinking can increase the permeability of biofilms, reduce blood viscosity, maintain vascular elasticity, prevent thrombosis, and prevent and resolve stones;
2. Regular consumption can strengthen the body, improve the body's immune system, resist aging, prevent and treat various diseases, accelerate and promote the metabolism of the human epidermis. Commonly used, it can make your skin smooth, delicate, and beautiful.
How are magnets made?
Ferromagnetic substances such as iron, cobalt, nickel, or ferrite are different in that their internal electron spins can spontaneously arrange within a small range, forming a spontaneous magnetization region called a magnetic domain. After magnetization of ferromagnetic materials, the internal magnetic domains are arranged neatly and in a consistent direction, strengthening the magnetism and forming a magnet. The process of attracting iron by a magnet is the magnetization process of the iron block. The magnetized iron block and the magnet generate attraction between different polarities, and the iron block firmly "sticks" to the magnet.
Natural magnets are made of iron trioxide, while artificial magnets are usually made of steel. After being magnetized, steel will always retain its magnetism. Generally, natural permanent magnets are not only ferrite (ferric oxide), but also various permanent magnet materials such as iron cobalt nickel alloys and rare earth alloys of iron, such as aluminum nickel cobalt, samarium cobalt, neodymium iron boron. These materials are also very common and have strong magnetism. They can be magnetized by a constant magnetic field, and after magnetization, they themselves have magnetism and do not disappear. The composition of artificial magnets is determined according to the magnetization properties of various metals, as needed. A magnet approaches (touches) a magnetic substance, which induces a synonymous pole at one end and generates a homonymous pole at the other end.
Magnet classification
A. Temporary (soft) magnet
a. Meaning: Magnetism is brief, but it disappears when the magnet is removed. b. Example: Iron nails, wrought iron
B. Permanent (hard) magnet
a. Meaning: After magnetization, it can maintain magnetism for a long time. b. Example: Steel nails
Based on the above information, it can be summarized as follows: According to the principle of electromagnetic induction, a strong current can generate a strong magnetic field. By using a strong magnetic field to magnetize ferromagnetic materials, and due to the different magnetization characteristics of different substances, some substances are easy to magnetize and are not easy to lose magnetism (lose magnetism), and can maintain magnetism for a long time. Magnetizing this material produces a magnet. Use a magnetizer to magnetize hard magnets.
According to the principle of electromagnetic induction, electric current can generate a magnetic field, and using a strong magnetic field to magnetize hard magnetic materials is generally referred to as a magnetic material of a magnet. In fact, there are several different things: the most common magnet, such as the magnet used for general speakers, is a ferrite magnet. They are produced by using iron scales (iron oxides in the form of flakes) that fall off the surface of steel billets during the hot rolling process of steel mills. After impurity removal, crushing, and adding a small amount of other substances, they are pressurized and formed in a steel mold. Then, they are sintered in a reducing electric furnace (through hydrogen) to reduce some of the oxides to ferrite, cooled, and magnetized in an exciter.
What is more upscale than them is magnetic steel: magnetic steel is a true steel, consisting mainly of a high content of nickel in addition to iron. It is generally melted in a medium frequency electric furnace (each furnace weighs only a hundred or ten kilograms) and cast into shape. Due to the accuracy requirements of certain surfaces, it is generally ground and processed using a grinder. Then magnetize and become a product. This type of magnetic steel is used in various types of electricity meters for measuring electricity. A more advanced magnetic material is neodymium iron boron type magnetic material. They are substances containing rare earth elements neodymium, iron, and boron. The production is made by the method of hard alloy: through powder making, mixing, molding, sintering, precision processing, and magnetization. This type of magnetic material has the highest magnetic field strength, the best performance, and the most expensive price. It is only used in national defense, military industry, and precision equipment. The rotor of the stepper motor in the electronic watch is. Ah, the maglev train must be made of this magnetic material. Ferrite permanent magnet materials include strontium ferrite permanent magnet materials and barium ferrite permanent magnet materials, which can be divided into isotropy and anisotropy. Ferrite permanent magnet materials are commonly used in speaker magnets; Metal permanent magnet materials mainly include aluminum nickel cobalt permanent magnet materials and rare earth permanent magnet materials. Rare earth permanent magnet materials can be divided into samarium cobalt permanent magnet materials and neodymium iron boron permanent magnet materials. Rare earth permanent magnet materials are made through powder metallurgy processes. Magnetic strength? I haven't found any convincing information yet.
There are too many classifications of magnets, and I will briefly explain them here:
There are two main categories of magnetic materials: the first is permanent magnet materials (also known as hard magnets): materials themselves have the characteristic of preserving magnetic force. The second is soft magnet (also known as electromagnet): it requires external electricity to generate magnetic force. When we talk about magnets, we usually refer to permanent magnet materials.
There are also two categories of permanent magnet materials: the first category is alloy permanent magnet materials, including rare earth permanent magnet materials (neodymium iron boron Nd2Fe14B), samarium cobalt (SmCo), and neodymium nickel cobalt (NdNiCO). The second major category is: ferrite permanent magnet materials (Ferrites), which are divided into sintered ferrite, bonded ferrite (rubber magnetic Rubber Magnet), and injection molded ferrite according to different production processes. These three processes are divided into isotropic and heterorhombic magnets based on the orientation of the magnetic crystals.
Antimatter of neodymium iron boron permanent magnet material:
The antimatter of neodymium iron boron permanent magnet materials. The existence of antimatter in the universe is a major scientific proposition. According to the currently recognized Big Bang theory, the universe was formed by the Big Bang about 15 billion years ago, and the Big Bang should produce an equal amount of matter and antimatter. What constitutes our surrounding world is matter, and where is antimatter?
Another challenge in astrophysics and cosmology today is the exploration of dark matter. Astronomy refers to the matter in the universe that cannot be seen optically as dark matter, characterized by neither emitting light nor interacting with light, and only having universal gravitation. Recently, astronomical observations and research have found that dark matter accounts for approximately 60% of the universe. What exactly are these dark matter? public opinions are divergent.
Therefore, finding a method to detect antimatter and dark matter is particularly important! Thus, the "Alpha Magnetic Spectrometer" came into being. The "Alpha Magnetic Spectrometer" experiment was led by Professor Ding Zhaozhong, a Chinese American scientist and Nobel laureate. Many scientists from more than 10 countries and regions, including the United States, China and Germany, participated in the research and design work. Its core component is a neodymium iron boron ring permanent magnet with an outer diameter of 1.6 meters, an inner diameter of 1.2 meters, and a weight of 2 tons. If a conventional magnet is used, it cannot operate in space due to the influence of the diffuse magnetic field everywhere, and it is unrealistic to use superconducting magnet, which material is the most suitable? Chinese scientists proposed to make Nd-Fe-B permanent magnets that fully meet the requirements of space operations, and put them into the "Alpha Magnetic Spectrometer" to provide powerful magnetic force for them to capture the information of antimatter and dark matter.
National hotline: Hu Bolin


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