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Polycrystalline ceramic magnetic material, microwave magnetic components, and irreversible circuit devices made by using the same

A technology of magnetic materials and polycrystalline ceramics, applied in magnetic materials, electrical components, circuits, etc., can solve the problems of being unable to become a low-loss microwave magnetic body, prone to out-of-phase or holes, etc., and achieve a small dielectric loss tanδ, Excellent microwave characteristics, low loss effect

Active Publication Date: 2008-11-12
HITACHI METALS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when Bi or low-melting point glass is added to a microwave magnetic material with a narrow single-phase region, out-of-phase and voids are likely to occur, making it impossible to obtain a low-loss microwave magnetic material.

Method used

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  • Polycrystalline ceramic magnetic material, microwave magnetic components, and irreversible circuit devices made by using the same
  • Polycrystalline ceramic magnetic material, microwave magnetic components, and irreversible circuit devices made by using the same
  • Polycrystalline ceramic magnetic material, microwave magnetic components, and irreversible circuit devices made by using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] As the starting material, Gd with a purity of 99.0% or more was weighed at the composition ratio shown in Table 1. 2 o 3 , Y 2 o 3 , CaCO 3 、 Bi 2 o 3 , Fe 2 o 3 、In 2 o 3 , V 2 o 5 、Al 2 o 3 and ZrO 2 , Add ion-exchanged water to make the concentration of slurry (slurry) 40% by mass, wet-mix with a ball mill for 40 hours, and dry. The obtained powder was calcined at a temperature of 825° C. for 2 hours. Ion-exchanged water was added to the obtained calcined powder so that the paste concentration was 40% by mass, wet pulverized with a ball mill for 24 hours, and dried. The average particle diameter of the obtained magnetic ceramic composition powder was 0.7 μm. Add the aqueous solution of binding agent (PVA) in this magnetic ceramic composition powder, carry out kneading and obtain granulated powder, at 2ton / cm 2 The granulated powder was shaped into a circular plate with a diameter of 14 mm and a thickness of 7 mm under a pressure of 100 °C. This mold...

Embodiment 2

[0058] Follow the steps below to make Figure 4 and Figure 5 The central conductor assembly 4 shown has a structure in which a central conductor is laminated on a rectangular microwave magnetic body having opposing first and second main surfaces and side surfaces connecting the two main surfaces. First, use a ball mill to grind Y with the composition of sample No.20 shown in Table 1. 2 o 3 、 Bi 2 o 3 , CaCO 3 , Fe 2 o 3 、In 2 o 3 、Al 2 o 3 and V 2 o 5 The initial raw materials constituted are wet-mixed, and after drying the obtained paste, they are temporarily fired at a temperature of 850° C., and they are wet-pulverized with a ball mill to produce the formula: (Y 1.45 Bi 0.85 Ca 0.7 )(Fe 3.95 In 0.3 Al 0.4 V 0.35 )O 12 (atomic ratio) of polycrystalline ceramic magnetic material powder. An organic binder (polyvinyl butyral PVB), a plasticizer (butyl phthalate (butoxyformyl) methyl BPBG), and an organic solvent (ethanol, butanol) to adjust its viscosity,...

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Abstract

The present invention provides a polycrystalline ceramic magnetic material which has a basic composition represented by the general formula: (Y3-x-y-zBixCayGdz)(Fe5-alpha-beta--epsilonInalphaAlbetaVZrepsilon)O12 (with the proviso that the following relationships by atomic ratio are satisfied: 0.4<X<1.5, 0.5<y<1, 0<z<0.5, y+z<1.3, 0<a<0.6, 0<beta<0.45, 0.25<<0.5, 0<epsilon<0.25, and 0.15<alpha+beta<0.75) and which consists mainly of a phase having garnet structure and permits burning at 850 to 1050 DEG C.

Description

technical field [0001] The present invention relates to microwave magnetic materials used in high-frequency circuit components, in particular to polycrystalline ceramic magnetic materials that can be fired simultaneously with electrode materials such as silver or copper. Background technique [0002] In recent years, the miniaturization of communication equipment using electromagnetic waves in the microwave region, such as mobile phones and satellite broadcasting equipment, has been gradually reduced. In response to this, the demand for miniaturization of various components is also increasing. Typical high-frequency circuit components used in communication equipment are microwave non-reciprocal circuit components such as circulators and isolators. Isolators are used in transceiver circuits of mobile communicators such as mobile phones used in microwave bands and UHF bands, which have little attenuation in the direction of signal transmission and large attenuation in the oppo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/40H01F1/34H01P1/383
CPCH01L25/16C04B2235/3298C04B2235/3239C04B2235/3225C04B2235/656H01P1/36C04B2235/3286H01F1/346C04B2235/3217H01L2924/0002C04B2235/6025C04B2235/3244H01P1/387H01P1/32C04B2235/3224C04B35/2675C04B2235/5445H01L23/64C04B2235/3208C04B2235/764H01L2924/00C04B35/26H01F1/34H01P1/383
Inventor 中岛广和伊藤博之
Owner HITACHI METALS LTD
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