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Commonly used important permanent magnets
(1)Rare-earth permanent magnet materials, which are the largest class of permanent magnetic materials with the highest maximum energy product, are NdFeB rare earth permanent magnetic materials, and are intermetallic compounds with rare earth elements and iron group elements as their main components (also known as metals). Interstitial compounds).
(2) Metal permanent magnetic materials. This is a large class of alloy permanent magnetic materials with iron and iron group elements (such as nickel and cobalt) as important constituents, which are developed and applied earlier. They mainly include AlNiCo alloys and iron-chromium-cobalt ( FeCrCo) is two major types of permanent magnetic alloys. Aluminum-nickel-cobalt-based alloys are medium in performance and cost, and they are developed earlier. The range of performance varies with chemical composition and manufacturing process, and therefore the application range is also wider. Iron-chromium-cobalt-based permanent magnetic alloys feature permanent magnetic material with medium performance, but their mechanical properties can undergo various mechanical processing and cold or thermal plastic deformation, and can be made into tubular, sheet-like or linear permanent magnetic materials and provide many Special application.
(3) Ferrite permanent magnet materials. This is a complex oxide ferromagnetic material (narrow) and a magnetically ordered material such as an antiferromagnetic material (broad) in which Fe2O3 is a major component. It is characterized by high resistivity and is particularly beneficial in high frequency and microwave applications. For example, barium ferrite (BaFe12O19) and barium ferrite (SrFe12O19) have many applications. In addition to the above three types of permanent magnetic materials, there are also permanent magnetic materials that have their own characteristics of manufacture, magnetism, and application. For example, powdered permanent magnetic materials, nano permanent magnetic materials, plastic-plastic permanent magnetic materials (can be applied to the closing of refrigerator doors), machinable permanent magnetic materials, and the like.
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