Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
The invention provides a high performance strontium-calcium permanent magnetic ferrite magnet and a preparation method thereof; and the invention belongs to the field of permanent magnetic materials. The magnet has a principal phase of a hexagonal crystal structure. The principal phase of the hexagonal crystal structure consists of metal elements represented by a formula of Sr(x)Ca(y)La1-x-yFe(z)Co(m), and the formula satisfies the conditions that: x is greater than or equal to 0.2 and less than or equal to 0.8; y is greater than or equal to 0.1 and less than or equal to 0.4; z is greater than or equal to 9.0 and less than or equal to 11.0; m is greater than or equal to 0.1 and less than or equal to 0.2; and y/m is greater than or equal to 1.5 and less than or equal to 2.0; meanwhile, by the cooperative use of a secondary additive, the magnet has a high magnetic performance that Br: 4200 Gs - 4600 Gs, Hcj: 4000 Oe - 5600 Oe, and a rectangle degree Hk/Hcj higher than 0.90. In the high performance strontium-calcium permanent magnetic ferrite magnet and the preparation method thereof, a radial shrinkage ratio of a sintered magnet is ranging from 1.10 to 1.12 by controlling the content of silicon in a primary pre-sintering powder material and the secondary additive, thus increasing the production efficiency of the sintering process, reducing the production cost, and meeting the requirements of a massive industrial production.
The invention provides a high performance strontium-calcium permanent magnetic ferrite magnet and a preparation method thereof; and the invention belongs to the field of permanent magnetic materials. The magnet has a principal phase of a hexagonal crystal structure. The principal phase of the hexagonal crystal structure consists of metal elements represented by a formula of Sr(x)Ca(y)La1-x-yFe(z)Co(m), and the formula satisfies the conditions that: x is greater than or equal to 0.2 and less than or equal to 0.8; y is greater than or equal to 0.1 and less than or equal to 0.4; z is greater than or equal to 9.0 and less than or equal to 11.0; m is greater than or equal to 0.1 and less than or equal to 0.2; and y/m is greater than or equal to 1.5 and less than or equal to 2.0; meanwhile, by the cooperative use of a secondary additive, the magnet has a high magnetic performance that Br: 4200 Gs - 4600 Gs, Hcj: 4000 Oe - 5600 Oe, and a rectangle degree Hk/Hcj higher than 0.90. In the high performance strontium-calcium permanent magnetic ferrite magnet and the preparation method thereof, a radial shrinkage ratio of a sintered magnet is ranging from 1.10 to 1.12 by controlling the content of silicon in a primary pre-sintering powder material and the secondary additive, thus increasing the production efficiency of the sintering process, reducing the production cost, and meeting the requirements of a massive industrial production.
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