Properties of hot-pressed and hot-deformed NdFeB magnets Hot-pressed and hot-deformed NdFeB magnets were successfully researched and developed almost simultaneously with sintered NdFeB magnets. In 1985, the General Motors Corporation (GM) Research Center of the United States reported that using hot pressing technology to press the quenched NdFeB magnetic powder in an argon environment at 700 [...]
Preparation process of sintered NdFeB magnets (1) - Raw material Today we start with the link of raw material preparation and alloy preparation. Sintered magnets usually use pure metals or intermediate alloys as raw materials, use the electromagnetic induction heating principle of eddy current generated by alternating magnetic fields in the raw materials, and conduct [...]
Preparation process of sintered NdFeB magnets (2) - Milling powder In the previous issue, we learned about alloy smelting and casting. After casting, the alloy needs to be made into powder through a pulverizing process before entering the subsequent processing process. Obtaining suitable powder shape, average particle size and particle size distribution is the basic [...]
Preparation process of sintered NdFeB magnets (3) - orientation forming Magnetic field orientation forming is to use the interaction between magnetic powder and external magnetic field to arrange the easy magnetization direction of powder particles so that it is consistent with the final magnetization direction of the magnet. This is the most commonly used method [...]
Preparation process of sintered NdFeB magnets (4) - Sintering, heat treatment and machining Sintering and heat treatment The blanks pressed by magnetic field orientation are sintered in a high vacuum or pure inert atmosphere to reach a high density close to 95% of the theoretical density. The magnet holes are in a closed structure, which [...]
NdFeB chemical composition analysis (ICP analysis) The chemical composition analysis of NdFeB materials generally includes: 1-Chemical composition analysis of raw materials, including the chemical composition of rare earth metal raw materials, as well as industrial pure Fe, B-Fe alloys and other metals, such as Ga, Al, Nb, Zr, etc.; 2- The chemical composition of the [...]
A 20-kilometer metal rope was thrown into the ionosphere to harness geomagnetism in space In 1996, the US Space Shuttle Columbia released a tethered satellite in space. A nearly 20-kilometer-long conductive rope was connected between the satellite and the space shuttle. up to 3 amps. Electricity is one of the most important inventions in human [...]
Magnetism can generate electricity! Why don't people use the Earth's own large magnetic field to generate electricity? Magnetism can generate electricity, which is a major law known to all. But why can't people use the earth's own magnetic field to generate electricity? This got people thinking. This requires first understanding electricity and magnetism. Electricity and [...]
Application of High Performance Sintered NdFeB Magnets in Wind Power Generators Abstract: The permanent magnet wind turbine adopts high-performance sintered NdFeB permanent magnets, and the high enough coercive force can prevent the magnets from demagnetization at high temperature. The life of the magnet depends on the substrate material and surface anti-corrosion treatment. The anti-corrosion of [...]
Why don't we use the magnetic field provided by the earth to generate electricity? It sounds like a good idea, but it's not very practical. Before we explain why, let's understand how we generate electricity, in case anyone reading this doesn't already know. Electricity (we say "current") is created when charged particles flow, like water [...]
Scientists design new magnets to provide room for sustained nuclear fusion reactions Scientists are working to realize the potential of nuclear fusion as a nearly inexhaustible source of clean energy, one of the ways that is through new and improved magnets that confine the fields of plasmas so that key reactions can occur . A [...]
Magnets Generate More Electricity in Generators Purdue University researchers have developed a parallel arrangement of inner magnets to reduce size and increase the efficiency of low- to medium-power generators. Source: Purdue University Generators have many uses, from cars to airplanes to microgrids. There is currently a strong desire to reduce size and increase efficiency of [...]