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Magneto-plumbite type permanent magnetic ferrite and manufacturing method thereof

A technology of permanent magnet ferrite and magnetoplumbite, applied in the field of permanent magnet ferrite and its manufacture, can solve the problem of low magnetic performance, and achieve the effects of improving magnetic performance, increasing utilization rate and reducing dosage

Active Publication Date: 2011-04-13
自贡市江阳磁材有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the academic paper of H.Yamamoto et al.IEEE Trans Maga MAG-15 (1979), a Ca-La permanent magnet ferrite is mentioned, whose chemical composition is (CaO Fe 2 o 3 ) 100-X (La 2 o 3 ) X , when X=2~3, it is found that there is an M-type magnetoplumbite structure in the compound. When X=3, the magnetic properties of the material achieve the best value, and the best value is: Br=4100Gs, H CB =2050 Oe,H CJ =2100 Oe, its magnetic properties are low

Method used

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  • Magneto-plumbite type permanent magnetic ferrite and manufacturing method thereof
  • Magneto-plumbite type permanent magnetic ferrite and manufacturing method thereof

Examples

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Effect test

Embodiment 1

[0050] Iron scale (mass percentage: TFe≥73%, FeO≥38%, MnO≤0.2%, SiO 2 ≤0.1%, S≤0.1%), after being ground to an average particle size of 1.5μm, the powder after oxidation treatment in an oxidation kiln at 880°C for 1.5 hours is Fe as its main component 2 o 3 , and prepare SrCO with a mass fraction of more than 98% 3 Powder, more than 98.5% CaCO 3 Powder, more than 99% La 2 o 3 Powder, cobalt oxide powder with a mass fraction of Co of more than 72%; secondary component Sr m m p B z o m+p+2z Preparation: take m=0.9, p=2.7, z=0.3, mix them uniformly by dry or wet method, keep warm at 950°C in air for 2 hours, and then finely pulverize to a powder with an average particle size of 1.5μm.

[0051] The principal component of the material, (Ca0) X ·(R 2 o 3 ) Y ·(Fe 2 o 3 ) n , wherein x=0.4, y=0.55, and n is 5.9 to calculate the addition amount of each main raw material. And be 2.3% by weighing the Sr by the mass fraction of the calcined material to be generated m m ...

Embodiment 2

[0054] Subcomponent Sr as a material m m p B z o m+p+2z , added in the finely pulverized stage after pre-burning, the others are the same as in Example 1, and the magnetic properties of the prepared samples are shown in Table 1.

Embodiment 3

[0056] Subcomponent Sr as a material m m p B z o m+p+2z , added directly in the mixing stage before pre-burning, kept in air at 950°C for 2 hours, and then raised to 1295°C for 2 hours. The rest are the same as in Example 1, and the magnetic properties of the prepared samples are shown in Table 1.

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Abstract

The invention discloses a magneto-plumbite type permanent magnetic ferrite and a manufacturing method thereof, and belongs to the field of permanent magnetic ferrites. The main components of the permanent magnetic ferrite are shown in (CaO)x.(R2O3)y.(Fe2O3)n, wherein R is at least one element of La, Nd and Pr and certainly comprises La; and a compound additive SrmMpBzOm+p+2z serving as an auxiliary component is added, wherein M is at least one element of Co, Zn, Ni, Mn and Cu and certainly comprises Co, and x, y, n, m, p and z in the formula represent the molar ratio of the added main metal elements respectively. An optimized process design is adopted, and the autonomously developed compound additive SrmMpBzOm+p+2z is added, so that the liquid phase sintering of a product is facilitated, the grain structure of the product is improved, and even if low-cost iron scale is taken as a main raw material, a magnet with high magnetic performance is manufactured under the condition of small substitution amount of the cobalt element.

Description

Technical field: [0001] The invention relates to a permanent magnet ferrite and a manufacturing method thereof, and relates to the field of permanent magnet ferrite, in particular to permanent magnet ferrite. Background technique: [0002] Permanent ferrite material is a functional material that generates a magnetic field. High-performance permanent ferrite plays an important role in the electronics industry, information industry, motorcycles, electric tools, automobile industry and other industries. The ferrite material widely used at present is Sr ferrite (SrFe 12 o 19 ), the final magnetic properties of the magnets are generally determined by the remanence Br, intrinsic coercive force H CJ to measure. In recent years, the miniaturization and weight reduction of automobile motors and the high efficiency of motors for electrical equipment require permanent magnet ferrite to maintain high remanence Br and at the same time have stronger anti-demagnetization ability, that i...

Claims

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Application Information

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IPC IPC(8): C04B35/40C04B35/622
Inventor 邓志刚刘力朱泽贤袁文广
Owner 自贡市江阳磁材有限责任公司
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