Low-temperature sintered high-permeability NiCuZn ferrite material

A technology of ferrite materials and high magnetic permeability, which is applied in the field of low-temperature sintered high magnetic permeability NiCuZn ferrite materials, can solve the problems of easy re-agglomeration, particle size reduction, cost reduction, etc., and achieve improved mechanical strength, Improve sintered density and save energy

CN102211929AInactive Publication Date: 2011-10-12TAIXING ZHONGHENG BUILDING DECORATION ENGCO
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2011-10-12
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a low-temperature sintered high-permeability NiCuZn ferrite material for a wire wound chip inductor and a preparation method of the ferrite material. The ferrite material comprises the following main components based on oxide content: 40.5 to 49.6 moles percent of Fe2O3, 30 to 47 moles percent of ZnO, 5 to 20 moles percent of CuO and the balance of NiO. The preparation method comprises the following steps of: (1) mixing raw materials, (2) performing primary sanding, (3) performing primary spray drying and granulation, (4) pre-sintering, (5) adding trace elements, (6) performing secondary sanding, (7) performing secondary spray drying and granulation, (8) molding and (9) sintering. By adding auxiliary components such as NaCO3, B2O3, Ta2O5 and the like, the sintering temperature is greatly reduced, the sintering temperature is below 900 DEG C, the high-frequency electromagnetic performance of the material is greatly improved, the sintering density of the material is improved, the mechanical strength of the material is improved, and the manufacturing process requirement of the wire wound chip inductor is met; and on the other hand, energy is saved, and the producing and manufacturing costs are greatly reduced. The initial permeability of the material is 2,850; the specific loss coefficient of the material is less than 5.5*10<-6> under the test conditions of 100 kHz and 0.25mT; and the specific loss coefficient of the material is less than 25.6*10<-6> under the test conditions of 500 kHz and 0.25mT.
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Description

technical field

[0001] The invention relates to a method for preparing low-temperature sintered high-permeability NiCuZn ferrite material. Background technique

[0002] The continuous progress of modern electronic technology requires that electronic equipment continue to develop in the direction of miniaturization, light weight, and thinning. In addition, in order to adapt to modern communications, network technology, computers, audio-visual equipment, electronic office equipment, automotive electronic systems, military and aerospace electronics As well as the needs of electromagnetic compatibility (EMC), chip inductors, one of the three major passive devices, have also achieved greater development.

[0003] Structurally, there are two types of chip inductors, one is a laminated chip inductor, and the other is a wire-wound chip inductor. Each of these two chip inductors has its outstanding advantages: the size of the laminated chip inductor can be made smaller, but due to s...

Examples

Embodiment 1

[0048] (1) Selection of raw materials: The raw materials of the low-temperature sintered NiCuZn ferrite materials are selected from industrially pure Fe 2 o 3 , ZnO, NiO, CuO.

[0049] (2) Composition design and weighing: according to the main component Fe 2 o 3 49.2mol%, ZnO 37mol%, CuO 10mol%, NiO 3.8mol%, weigh the corresponding weight of Fe 2 o 3 , ZnO, CuO and NiO.

[0050] (3) Mixing of raw materials: Put the weighed raw materials into a sand mill, add deionized water of equal weight, and sand mill for 0.5 hour.

[0051] (4) One-time spray drying granulation:

[0052] Add about 10% PVA solution (concentration is about 10%) in raw material slurry, carry out spray drying granulation once.

[0053] (5) Pre-burning:

[0054] The primary spray-dried granulated powder is pre-fired through a rotary kiln at a temperature of 750°C.

[0055] (6) Auxiliary ingredients added:

[0056] NaCO 3 : 0.60wt%, B 2 o 3 : 0.08wt%, Ta 2 o 5 : 0.25wt%.

[0057] (7) Secondary san...

Embodiment 2

[0069] (1) Material selection: The raw material of the low-temperature sintered NiCuZn ferrite material is selected from industrially pure Fe 2 o 3 , ZnO, NiO and CuO.

[0070] (2) Composition design and weighing: according to Fe 2 o 3 46 mol%, ZnO 32 mol%, CuO 15 mol%, NiO 7 mol%, weigh the corresponding weight of Fe 2 o3 , ZnO, CuO and NiO.

[0071] (3) Mixing of raw materials: Put the weighed raw materials into a sand mill, add deionized water of equal weight, and sand mill for 0.5 hour.

[0072] (4) One-time spray drying granulation:

[0073] Add about 10% PVA solution (concentration is about 10%) in raw material slurry, carry out spray drying granulation once.

[0074] (5) Pre-burning:

[0075] The primary spray-dried granulated powder is pre-fired through a rotary kiln at a temperature of 730°C.

[0076] (6) Auxiliary ingredients added:

[0077] NaCO 3 : 0.25wt%, B 2 o 3 : 0.20wt%, Ta 2 o 5 : 0.18wt%.

[0078] (7) Secondary sanding:

[0079] Put the ferri...

Embodiment 3

[0090] (1) Material selection: The raw material of the low-temperature sintered NiCuZn ferrite material is selected from industrially pure Fe 2 o 3 , ZnO, NiO and CuO.

[0091] (2) Composition design and weighing: according to the formula Fe 2 o 3 41mol%, ZnO 30mol%, CuO 19mol%, NiO 10mol%, weigh the corresponding weight of Fe 2 o 3 , ZnO, CuO and NiO.

[0092] (3) Mixing of raw materials: Put the weighed raw materials into a sand mill, add deionized water of equal weight, and sand mill for 0.5 hour.

[0093] (4) One-time spray drying granulation:

[0094] Add about 10% PVA solution (concentration is about 10%) in raw material slurry, carry out spray drying granulation once.

[0095] (5) Pre-burning:

[0096] The primary spray-dried granulated powder is pre-fired through a rotary kiln at a temperature of 710°C.

[0097] (6) Auxiliary ingredients added:

[0098] NaCO 3 : 0.10wt%, B 2 o 3 : 0.35wt%, Ta 2 o 5 : 0.08wt%.

[0099] (7) Secondary sanding:

[0100] Pu...