NdFeB magnets used in MRI machines

NdFeB magnets, as the latest result of the development of rare earth permanent magnet materials, are called the "Magnet King" due to their excellent magnetic properties. Neodymium NdFeB magnet is an alloy of neodymium, iron oxide, etc. Also known as magnetic steel. NdFeB magnets have extremely high magnetic energy product and coercive force. At the same time, the advantages of high energy density make NdFeB permanent magnet materials widely used in modern industry and electronic technology, thus making instrumentation, electroacoustic motors, magnetic separation It becomes possible to make equipment such as magnetization smaller, lighter, and thinner.

The advantages of NdFeB magnets are 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 adjusted by adjusting its chemical composition and adopting surface treatment methods. Improvements can be made to meet the requirements of practical applications.

Advantages of NdFeB magnets:

1. NdFeB magnet products have high precision: they can meet the precision requirements in one molding without excessive post-processing.

2. NdFeB magnets have excellent magnetic properties: the magnetic energy product is three times that of anisotropic ferrite, and the intrinsic coercive force is high. Mass production has stable magnetic properties and good consistency.

3. Good temperature stability: the working temperature can reach 150℃.

4. Good corrosion resistance and good surface quality: The surface of the product is coated with epoxy resin and the most advanced Parylene coating. It has excellent corrosion resistance, smooth and beautiful surface, and no blistering, cracking, peeling, flashing or grain loss. and other phenomena.

The market penetration rate of traditional applications of NdFeB magnets (speakers, electrification, permanent motors, VCM, MRI, etc.) is already high, and the demand is in a stable growth period, with an annual growth rate of 5%-10%; while new applications (wind power, variable frequency air conditioners, etc.) , energy-saving elevators, hybrid vehicles, automotive EPS steering motors) are the main driving forces for the development of the NdFeB magnet industry.

Today's MRI machines are cost-effective and high-tech diagnostic instruments that are more sophisticated than CT. The nuclei of various elements in human cells have nuclear magnetic moments and will resonate under strong magnetic fields. This is because normal human cell tissues and diseased cell tissues resonate at different times. After precise scanning and analysis of the image data, we can reflect the early Tiny lesions. But the device requires a powerful magnetic field system to support it. Superconducting magnets need to be equipped with a relatively expensive ultra-low temperature system, and installation and maintenance are very complicated; ordinary ferrite magnets require hundreds of tons of magnets to assemble, which are very large and bulky. If you use the king of magnets - neodymium iron boron magnets, they will not be big and bulky. Two tons of magnets can be completed. If you compare one hundred tons and three tons, the size will definitely be much smaller, while ensuring the same cost performance. case, small and lightweight.