Low SFD magnetic recording material and preparation method thereof

A magnetic recording and oxide technology, applied in the field of magnetic information materials, can solve problems such as restricting applications, and achieve the effects of ensuring magnetic properties, refining particle size, and changing magnetic properties

Active Publication Date: 2019-03-26
BGRIMM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing technology, the SFD is relatively high, which limits its application in some fields

Method used

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  • Low SFD magnetic recording material and preparation method thereof

Examples

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preparation example Construction

[0058] The present invention also provides a kind of preparation method of the magnetic recording material of described low SFD, comprises the steps:

[0059] The raw materials are mixed in proportion, densified, pre-fired at 1000-1200° C. for 1-4 hours, coarsely crushed and finely ground, and tempered at 920-1000° C. for 1-4 hours to obtain the magnetic recording material.

[0060] In a preferred embodiment of the present invention, the pre-calcination is carried out at 1000-1200° C. with gradient temperature increase for 1-4 hours. More preferably, pre-calcine at 1000-1050°C for 0.5-1h, raise the temperature to 1060-1100°C for 0.5-1h, and raise the temperature to 1150-1200°C for 0.5-2h.

[0061] In a preferred embodiment of the present invention, the densification treatment includes: using an ore mill for densification treatment for 30-90s.

[0062] In a preferred embodiment of the present invention, the size of the pelletized pellets is 50-500 μm.

[0063] In a preferred ...

Embodiment 1

[0067] The preparation method of the magnetic recording material described in the present embodiment, the steps are as follows:

[0068] (1) In parts by weight, weigh 135 parts of iron red (Tangshan Iron and Steel Group), 15 parts of strontium carbonate, 7 parts of barium carbonate, 1.5 parts of manganese oxide, 0.7 parts of niobium oxide, 1.2 parts of samarium oxide, and 1.2 parts of titanium oxide , 1.6 parts of cobalt oxide, 1.6 parts of zirconia, 1.6 parts of nickel oxide, and 2 parts of bismuth trioxide are mixed and placed in an ore mill. After densification treatment for 60 seconds, pellets are made with water, and the size of the pellets is 200 μm;

[0069] (2) Pre-burn the pellets obtained in step (1) at 1020°C for 0.5h, raise the temperature to 1080°C for 1h, and then raise the temperature to 1180°C for 1h; after the end, use a ball mill to perform coarse crushing to the average particle size 2.0 μm;

[0070] (3) placing the coarsely crushed material obtained in ste...

Embodiment 2

[0073] The present embodiment refers to the preparation method of Example 1, and the only difference is that the raw materials of this embodiment are 135 parts by weight of iron red (Tangshan Iron and Steel Group), 18 parts of strontium carbonate, 8 parts of barium carbonate, and 1.5 parts of manganese oxide. 0.7 parts of niobium oxide, 1.2 parts of samarium oxide, 1.2 parts of titanium oxide, 1.6 parts of cobalt oxide, 1.6 parts of zirconia, 1.6 parts of nickel oxide, and 2 parts of bismuth trioxide.

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Abstract

The invention relates to the technical field of magnetic information materials and especially relates to a low SFD magnetic recording material and a preparation method thereof. The low SFD magnetic recording material is mainly prepared from the following ingredients in parts by weight: 100 to 200 parts of iron oxide, 10 to 20 parts of strontium salt, 5 to 10 parts of barium salt, 1 to 2 parts of VIIB metal oxide, 0.5 to 1 part of VB metal oxide, 0.5 to 2 parts of samarium oxide, 4 to 10 parts of additive and 1 to 3 parts of fluxing agent, wherein the additive includes one or more of titanium oxide, cobalt oxide, zirconium oxide and nickel oxide. According to the low SFD magnetic recording material disclosed by the invention, the VIIB metal oxide and the VB metal oxide are added, special electron distribution of the VIIB metal oxide and the VB metal oxide are utilized, the VIIB metal oxide and the VB metal oxide perform alloying action with iron, strontium and barium, and a lattice constant is changed; thus, magnetism of the magnetic recording material is changed, and an SFD value is promoted to be reduced.

Description

technical field [0001] The invention relates to the technical field of magnetic information materials, in particular to a low SFD magnetic recording material and a preparation method thereof. Background technique [0002] With the rapid development of science and technology, magnetic recording materials have been widely used in the storage of electronic data. Magnetic recording materials have been applied in many fields, such as tickets, cards, ID cards, etc., using magnetic recording materials to identify information. [0003] As a magnetic recording material, the main requirements include high coercive force, appropriately high saturation magnetization, high remanence ratio, steep hysteresis loop, low magnetic temperature coefficient and aging coefficient, etc. High coercive force can improve the density and anti-interference of stored information, appropriately high saturation magnetization can increase the output information intensity, high remanence ratio can improve i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/40C04B35/626H01F1/11H01F41/00
CPCC04B35/2633C04B35/2641C04B35/265C04B35/62605C04B2235/3213C04B2235/3215C04B2235/3224C04B2235/3232C04B2235/3244C04B2235/3251C04B2235/3262C04B2235/3275C04B2235/3279C04B2235/3298H01F1/11H01F41/00
Inventor 刘荣明张威峰刘辉王倩贾立颖李炳山
Owner BGRIMM TECH CO LTD
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