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Low temperature sintered very high frequency laminated sheet type electrical inductance, sheet type magnetic beal material and its preparation method

A VHF laminated chip and VHF technology, which is applied in the material and preparation field of a VHF laminated chip inductor or chip magnetic bead, can solve the problem that the maximum use frequency is only 100MHz, etc. To achieve the effects of easy control of process parameters, wide application prospects and simple preparation methods

Inactive Publication Date: 2005-03-02
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the chip inductor materials used at home and abroad are mainly NiZnCu ferrite, but its highest frequency is only 100MHz, which cannot be applied to very high frequency bands.

Method used

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  • Low temperature sintered very high frequency laminated sheet type electrical inductance, sheet type magnetic beal material and its preparation method
  • Low temperature sintered very high frequency laminated sheet type electrical inductance, sheet type magnetic beal material and its preparation method
  • Low temperature sintered very high frequency laminated sheet type electrical inductance, sheet type magnetic beal material and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0033] Embodiment 1, adopts analytically pure Fe 2 o 3 、BaCO 3 , SrCO 3 , PbO, Co 3 o 4 , ZnO, CuO as initial raw materials, molar ratio Fe 2 o 3 : BaCO 3 : SrCO 3 :PbO:Co 3 o 4 : ZnO: CuO = 1: 0.2: 0.1: 0.09: 0.1: 0.24: 0.12 Weighed, ball milled and mixed with absolute ethanol for 24 hours, dried at 70-100°C, passed through a 200-mesh sieve, and tested at 1000°C and 1050°C , 1100 ℃ pre-burning, heat preservation for 6 hours, 4 hours, 2 hours, to obtain pure single-phase Y-type soft magnetic ferrite powder; the obtained Y-type ferrite powder and the raw material as Bi 2 o 3 +Al 2 o 3 +PbO+B 2 o 3 +SiO2 2 +CaF 2 The composite low-fired sintering aid mixed with equal amounts of LiF is mixed according to the weight ratio of 5%, 3%, and 1% with the weight of ferrite powder, ball milled for 24 hours, dried and sieved, granulated, and formed, respectively at 850 °C, 890 °C and 920 °C for 10 hours, 6 hours, and 0.5 hours for sintering and heat preservation, which ar...

Embodiment 2

[0035] Embodiment 2, adopt analytically pure Fe 2 o 3 、BaCO 3 , SrCO 3 , PbO, Co 3 o 4 , ZnO, CuO as initial raw materials, molar ratio Fe 2 o3 : BaCO 3 : SrCO 3 :PbO:Co 3 o 4 : ZnO: CuO = 1: 0.3: 0.05: 0.01: 0.13: 0.1: 0.22 Weighed, ball milled and mixed with absolute ethanol for 24 hours, dried, passed through a 200-mesh sieve, and tested at 900°C, 950°C, 1000°C, Pre-fire at 1050°C, keep warm for 6 hours, 4 hours, 3 hours, 2 hours to obtain pure single-phase Y-type soft ferrite powder. Gained ferrite powder and take raw material as Bi 2 o 3 +Al 2 o 3 +PbO+B 2 o 3 +SiO2 2 +CaF 2 Composite low-fired sintering aid mixed with equal amounts of +LiF, mixed according to the weight ratio of 5%, 4%, 2%, 1% to the weight of ferrite powder, ball milled for 24 hours, dried and sieved, granulated, and formed , were sintered at 850°C, 870°C, 900°C and 920°C for 10 hours, 6 hours, 4 hours, and 0.5 hours, respectively, and were recorded as samples 2-1, 2-2, 2-3, and 2-4. ...

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Abstract

The VHF slice type inductance and the slice type bead material are obtained by sintering the admixture of BaSrPbZnCoCu and the sintering supporting agent being mixed according to certain weight percentage rate. Fe2O3, BaCO3, SrCO3, PbO, Co3O4 etc. are used as the main materials to prepare BaSrPbZnCoCu. The composite sintering supporting agent is prepared from Bi2O3+Al2O3+PbO+B2O3+SiO2+CaF2+LiF. The material possesses the properties of magnetic permeability 2-40, cut-off frequency 800 MHz to more than 1.8 GHz, the variety rate of specific temperature less than 10 to the power -6 / deg.C and resistivity larger than 10 to the power 9 ohm.cm. The invention realizes the low temperature sintering, providing the features of high density, the even size of crystal grain and the stable performance.

Description

technical field [0001] The invention belongs to the technical field of inductive material preparation, and in particular relates to a material of a very high-frequency laminated chip inductor or chip magnetic bead sintered at low temperature and a preparation method thereof. Background technique [0002] The key and difficult point of the process technology of multilayer chip inductors is the co-firing of magnetic dielectric materials and internal electrode materials. Considering the three aspects of conductivity, oxidation resistance and cost, silver paste is generally selected as the conductive paste, but the melting point of silver is only 961°C. This requires that the ferrite soft magnetic dielectric material has high magnetic permeability and high quality factor, and the sintering temperature must be lower than 900°C. At present, with the development of electronic technology, the application frequency band of electronic circuits is getting higher and higher, which has ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/34H01F17/00H01F41/02
Inventor 白洋周济李龙土桂治轮
Owner TSINGHUA UNIV
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