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Basic categories and main applications of soft magnetic alloy materials

The basic categories and main applications of soft magnetic alloy materials Magnetic materials are one of the most widely used magnetic materials in the electronics industry. With the current popularity of consumer electronic products and the development of wired and wireless communication technologies, the development and production of ferrite magnetic materials Has entered a flourishing era, has now formed a considerable scale of industrial development. Solenoid valve core material is generally divided into two major categories: MnZn, NiZn spinel, and planar. The former is mainly used for low, intermediate frequency (MnZn) and high frequency (NiZn), the latter can be used in the UHF range; from the perspective of application, it can be divided into high magnetic permeability μi, high saturation magnetic flux density Bs, high resistivity and high Frequency power (also known as power ferrite) and other major categories. Due to the characteristics of high magnetic permeability, high resistivity, low loss and the like, and the wear resistance of ceramics, ferrite magnets are widely used in industrial and civil applications. Industrial products are mainly used in switching power supplies, filters, and broadband transformers for computers, communications, electromagnetic compatibility, etc.; civilian products are mainly used in electron beam deflection coils, flyback transformers, midcycle transformers, inductors, and the like in televisions, recorders, etc. Yokes and other parts. R&D status quo at home and abroad: In ferrite magnetic materials, materials with μi>5000 are generally called high permeability, and the output of this material has been increasing in recent years, especially with the rapid development of digital technology and optical fiber communication today, and The market demand for inductors, filters, choke coils, wideband and pulse transformers has increased significantly. The magnetic materials used in them all require μi> 10,000 or more, which can reduce the size of the magnetic core to a large extent, so as to accommodate the miniaturization of components. Lightweight development requirements. In addition to satisfying the requirements of magnetic materials, the magnetic core surface with high magnetic permeability must be very smooth, smooth and round, without burrs, and the surface must be coated with a uniform, dense, insulating and beautiful organic coating. With this technical difficulty, there is an urgent need to increase the magnetic permeability of the functional material (μi> 10,000) in the high magnetic permeability ferrite industry. After the 1990s, some well-known foreign companies such as Japan's TDK, TOKIN, HITACHI, IROX-NKK, FDK, KAWATETSU, Germany's SIEMENS, Philips of the Netherlands, and US SPANG magnetic branch have successively developed a new generation of ultra-high magnetic permeability H5D. (μi=15000), H5E (μi=18000) ferrite material. TDK Japan is the world's most famous leader in magnetic materials. Based on the early production of H5C2 (μi=10000), they have successively developed H5C3 (μi=12000), H5D (μi=15000) and H5E (μi). =18000) series of high μ soft ferrite materials; at the end of the 1990s, the ultra-high magnetic permeability Mn-Zn ferrite material with μi=20000 has been successfully tested. TOKIN has introduced to the market ferrite materials of 12000H (μi=12000), 15000H (μi=15000) and 18000H (μi=18000). High magnetic permeability ferrites T42, T46, T56, 3E6, 3E7 and MAT-W, MAT-H materials developed respectively by Siemens of Germany, Philips of the Netherlands, and SPANG of the United States, among which T46: μi=15000, 3E7:μi= 15000, MAT-H: μi=15000, the highest magnetic permeability of T56 and 3E9 materials developed by Siemens and Philips in 2000 has exceeded μi=18000. Although China's soft ferrite industry has developed rapidly, existing manufacturers have achieved a lot of achievements through technological transformation and process improvement, and product quality and output have been significantly improved, but currently only domestic production of μi=5000-7000 is possible. Low-grade ferrite materials, in the research and development of high permeability manganese-zinc-ferrite materials, domestic and foreign levels and distances are far from one another, and most companies still have too small a production scale, and the annual output is generally below 1,000 tons. There are only a handful of material manufacturers with μi> 10,000, and foreign companies with initial size generally produce more than 3,000 tons of ferrite per year, and annual production of TDK, FDK and other companies is as high as more than 20,000 tons. Magnetic separation According to the statistics of China Magnetic Industry Association, in 1999 China's production of μi = 8000-10000 material production is very small, but after 2000 the production of such medium and low-grade soft ferrite material has greatly improved. Some enterprises in Shanghai, Zhejiang, Shandong, Jiangsu, Sichuan and other places are developing R&D and production of medium-to-high-end materials with a volume of >10,000. For example, Baosteel Tiantong developed BRL10K (μi=10000) and BRL12K (μi=12000) products in 2000 and 2001 respectively. In 2000, Hebei Yishui and Shandong Zibo Magnetic Materials Factory also focused on research and development of μi>10000 ferrite materials; some high-permeability ferrite projects developed by some companies in Sichuan have received strong support from the National SME Technology Innovation Fund. Breakthroughs and innovations in large-scale production technologies. Zhejiang Hengdian Dongxi Central Research Institute has completed the trial production of materials with a volume of 10,000 to 15,000 in recent years, and can achieve mass production of some products. It is expected to move toward the development of high-grade magnetic materials with high magnetic permeability μi in the domestic magnetic industry. . In the true sense of high permeability μi soft ferrite materials, the μi value should be much more than 10,000 to meet the ultra-compact, miniaturization, and weight reduction of various devices in the IT industry and electronic equipment such as communications and computers. Standardized development needs. In order to change the backwardness of domestic related ferrite material production enterprises that have long been stranded in products, low output, poor appearance, lack of brand, and lack of competitiveness in foreign markets, relevant companies in the magnetic materials industry must attach great importance to and increase China's The research and development of high-grade soft magnetic ferrite materials will effectively improve the existing product structure, preparation process and processing methods, continuously expand the matching and export foreign exchange, strengthen international competitiveness, and adapt to the development of China's national industrial policies and international markets. demand. To this end, China's soft magnet oxygen industry should rationally plan and lay out the industrial structure, concentrate funds and strength, and work hard to cultivate and develop economies of scale and export bases. We should establish a few large and medium-sized backbone enterprises with certain foundations and well-known as the leader. Our high-grade soft magnetic ferrite production and export base companies form a national echelon in China's soft ferrite industry.

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