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1. Development of soft magnetic materials
The application of soft magnetic materials in industry began at the end of the 19th century. With the rise of power industry and telecommunications technology, low carbon steel began to be used to manufacture motors and transformers. Fine iron powder, iron oxide and fine iron wire were used in the magnetic core of inductance coil in telephone line. At the beginning of the 20th century, silicon steel sheet was developed to replace low carbon steel, which improved the efficiency of transformer and reduced loss. Until now, silicon steel sheet still ranks first in soft magnetic materials used in power industry. In the 1920s, the rise of radio technology promoted the development of high magnetic conductivity materials, such as permalloy and permalloy magnetic powder core. From the 1940s to the 1960s, it was a period of rapid development of science and technology. The invention of radar, television broadcasting and integrated circuit also had higher requirements for soft magnetic materials, and produced soft magnetic alloy ribbons and soft ferrite materials. In the 1970s, with the development of telecommunications, automatic control, computer and other industries, soft magnetic alloys for magnetic heads were developed. In addition to the traditional crystalline soft magnetic alloys, another kind of materials - amorphous soft magnetic alloys emerged.
2. Types of common soft magnetic cores
Iron, cobalt and nickel are the basic components of magnetic materials.
Classification by product form (main components, magnetic characteristics and structural characteristics):
(1) Powder core: magnetic powder core, including iron powder core, iron silicon aluminum powder core, high flux powder core (high flux), permalloy powder core (MPP) and ferrite core.
(2) Band wound iron core: silicon steel sheet, permalloy, amorphous and nanocrystalline alloy.
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