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NiZn soft magnetic ferrite and preparation method thereof

A technology of soft magnetic ferrite and soft ferrite, which is applied in the field of nickel-zinc ferrite with high thermal shock resistance and its preparation, to achieve the effects of reducing material stress, increasing anisotropy constant, and optimizing crystal structure

Active Publication Date: 2014-09-17
ZHAOQING CHAMPION FERRITE TECH
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  • Abstract
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Problems solved by technology

[0004] The purpose of the present invention is to provide a roller kiln for the common shortage of soft ferrite materials for SMD power inductors in the prior art that cannot simultaneously have high magnetic permeability, high BS, high strength and high thermal shock resistance. Preparation method of sintering and NiZn soft ferrite junction meeting the performance requirements of SMD power inductors

Method used

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  • NiZn soft magnetic ferrite and preparation method thereof
  • NiZn soft magnetic ferrite and preparation method thereof

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Embodiment Construction

[0022] According to the invention figure 1 The shown sintering temperature curves embody the present invention, but the present invention is not limited to these examples.

[0023] (1) Primary batching: take the raw material by weighing the composition ratio described in Table 1, the secondary component Bi 2 o 3 It is also added at the time of batching.

[0024] (2) Primary ball milling: dry milling in a vibration ball mill for 60-120 minutes.

[0025] (3) Pre-burning: The powder after primary ball milling is pre-fired in a pusher kiln at a temperature of 940±20°C and a holding time of 120-180 minutes.

[0026] (4) Secondary ingredients: add the selected de-Bi according to the ratio of the auxiliary ingredients 2 o 3 Other trace modifying elements.

[0027] (5) Secondary ball milling: The powder after secondary batching is subjected to wet ball milling for 5-8 hours, and the particle size of the slurry is controlled at 1-1.5 μm.

[0028] (6) Spray-drying granulation: ad...

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Abstract

A NiZn soft magnetic ferrite and a preparation method thereof. The NiZn soft magnetic ferrite contains main components and auxiliary components. The main components comprise ferric oxide, nickel oxide, zinc oxide, copper oxide, manganese carbonate and magnesium oxide; and the auxiliary components comprise bismuth oxide, calcium carbonate, silica, boron nitride, titanium boride and yttrium oxide (rare earth oxide). A material obtained by the preparation method has high permeability, high BS, high strength and high thermal shock resistance, and can meet the performance requirements of soft magnetic ferrite materials for an SMD power inductor.

Description

technical field [0001] The invention belongs to the technical field of soft magnetic ferrite, and in particular relates to a nickel-zinc ferrite with high magnetic permeability, high Bs, high strength and high thermal shock resistance for SMD power inductors and a preparation method thereof. Background technique [0002] Soft magnetic materials are mainly manganese-zinc and nickel-zinc ferrite, which are important electronic functional materials. Due to the characteristics of high magnetic permeability, high resistivity, and high frequency of use, nickel-zinc ferrite is widely used in computers, communications, and consumer electronics. Nowadays, electronic products are developing in the direction of flat, thin and surface mount, and the size of soft magnetic components is getting smaller and smaller. At the same time, the manufacturing process of SMD power inductors has adopted automatic assembly line production, especially the spot welding process, which has a great impact...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622
Inventor 廖晓舟
Owner ZHAOQING CHAMPION FERRITE TECH
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