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How to consider the specifications and types of magnets

When choosing NdFeB magnets, customers should choose the magnet trademark suitable for them according to their working temperature. If the working temperature is higher than the...

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Seismic magnet

A method of using magnets to make a simple "earthquake predictor" has recently been circulating online - hanging a magnet can predict a major earthquake in advance? Recently, a method for predicting earthquakes has begun to circulate online - hanging a magnet that adsorbs iron blocks at a high altitude. Before an earthquake, the Earth's magnetic field will change, and the magnet will not be able to catch the iron block. The sound of the iron block falling can serve as a warning. Many netizens will see this message on QQ groups: according to international organizations' predictions, the Earth will enter an earthquake year this year. Here, we recommend a method for earthquake prediction to friends: hang a magnet with a rope at a high place, facing the floor tile or an iron basin, and stick a large iron block on the magnet. Before an earthquake, the Earth's magnetic field undergoes drastic changes, causing the magnet to lose its magnetism, causing iron blocks to fall off and l

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2023-06

Single sided magnet

The magnetic refraction of a single sided magnet is similar to the refraction of signals by a satellite pot or the refraction of light by a flashlight pot. Its refractive effect is mainly determined by the following three aspects: 1. Material selection and thickness, as well as the distance between the magnet and the material. Pure iron sheet is prone to magnetic leakage, and after special treatment, its refraction will be enhanced. However, a 100% shielding material has not yet been developed, but the effectiveness of materials made by different manufacturers also varies. 2. Angle: According to the principle of refraction, curved materials have the best effect, while right angle materials have a greater refractive loss. 3. Space: Magnetic lines of force in the air are like mobile phone signals, requiring space to refract them. If the flashlight lamp pot is completely wrapped around the lamp, the use effect will definitely not be good, because a large amount of light refraction is lost

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2023-06

The difference between ferrite magnets and neodymium iron boron magnets

Ferrite magnets are metal oxides with ferromagnetism. In terms of electrical properties, the resistivity of ferrite is much higher than that of metal and alloy magnetic materials, and it also has higher dielectric properties. The magnetic properties of ferrite also exhibit high permeability at high frequencies. Therefore, ferrite has become a widely used non-metallic magnetic material in the high-frequency weak current field. It belongs to non-metallic magnetic materials and is a composite oxide (or ferrite) of magnetic iron oxide and one or more other metal oxides. Magnetic force is usually between 800 and 1000 Gauss and is often used in instruments such as speakers and speakers. [3]The advantages of neodymium iron boron magnets 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 sur

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2023-06

ferrite magnet

Produced using powder metallurgy method, with low residual magnetism and low recovery magnetic permeability. The magnetic circuit structure has high coercivity and strong resistance to demagnetization, making it particularly suitable for dynamic working conditions. The material is hard and brittle, and can be used for cutting processing with emery tools. The main raw material is oxide, so it is not easy to corrode. Working temperature: -40 ℃ to+200 ℃.Ferrite magnets can be further divided into anisotropy (anisotropy) and isotropy (isotropy). The magnetic properties of isotropic sintered ferrite permanent magnet materials are weak, but they can be magnetized in different directions of the magnet; Heterogeneous sintered ferrite permanent magnet materials have strong magnetic properties, but can only be magnetized along the predetermined magnetization direction of the magnet.In the actual production of ferrite magnets, raw materials with good chemical composition may not necessarily obtai

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2023-06

Liquid magnet

In mechanical manufacturing, the seal of the shaft and the body usually uses oily seal of rubber or other elastic materials. This structure has a short life span and poor reliability. It is even more unsuitable for occasions with radioactivity, corrosion, toxic and friction. However, as long as there are several drops of iron magnetic liquids between the shaft and the body, keep them there and then use a ring magnet to magnetize it, which becomes a liquid magnet seal.The liquid magnet seal completely eliminates the contact between the shaft and the body, which greatly reduces friction. At the same time, because the consumption of the iron magnetic liquid is very small, it can work and reliable for a long time. If you use it to seal the vacuum device, it can keep the vacuum of 10 billion mm Hg, which can be described as seamless. All mechanical devices use lubricants to reduce friction. If the iron magnetic liquid lubricating oil is used, the common mechanical "swimming" can be avoided

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2023-06

Superconducting magnet application

Taking the magnetic suspension train as an example, the application conditions for superconducting magnets are explained.The superconducting materials of the superconducting magnetic caravan application and the magnets constituted should meet the following conditions:① Can produce effective propulsion, suspension and guidance.② When approaching and leaving the ground device state, you can work under permanent current.③ As a vehicle equipment, the weight should be light and small.④ In order to have good electrical performance, the interval size of the surface of the ultra -coil and the cooling container shell is small.⑤ In order to reduce the working load of the car cooling equipment, there must be a good insulation layer.⑥ In order to prevent the interference of mechanical and electrical during operation, there must be sufficient mechanical strength and stabilityMaking superconducting magnets is not only a problem of magnetic materials, it is difficult to explain the short story in thi

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2023-06
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