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Compound low-temperature pre-sintering method of ferrite monoliths structure materials

A technology of low-temperature sintering and structural materials, which is applied in the field of preparation of magnetic component materials, can solve the problems of low electrode diffusion temperature requirements, high sintering temperature, and lower sintering temperature, so as to broaden the scope of technical fields, reduce sintering temperature, and improve The effect of electromagnetic properties

Inactive Publication Date: 2010-05-05
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve this contradiction between high and low, the current preparation technology is mainly through fine powdering or adding low melting point substances in the sintering process, but the sintering process in these methods must greatly improve the electromagnetic properties of the product on the basis of pre-sintering , making sintering a key process of material preparation, and this key process determines that the sintering temperature is much higher than the pre-sintering temperature, it cannot fundamentally reduce the sintering temperature, and solve the problem of high sintering temperature and low electrode diffusion temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Example 1: Preparation process of NiCuZn ferrite monolithic structure material by pre-firing and low-temperature sintering

[0046] Step 1. Prepare raw materials

[0047] Determination of reference indicators

[0048] The NiCuZn ferrite monolithic structure material prepared in this example is mainly used in the field of microwave communication, and its use environment has a great influence on the initial magnetic permeability μ of the material. i and power loss P CV The requirements are high, so during the burn-in process, the μ i and P CV As the reference index for detection, the specific scalars are determined according to the performance requirements of the product: μ i0 = 1250 and P CV0 =280kw / m 3 The specific scalars of these reference indexes can be determined by those skilled in the art according to different product performance requirements;

[0049] Ni according to molecular formula 0.2 Cu 0.2 Zn 0.62 O(Fe 2 o 3 ) 0.98 The main formula is used to ...

example 2

[0070] Example 2: Preparation method of compound garnet ferrite monolithic structure material by pre-firing and low-temperature sintering

[0071] Step 1: Prepare Ingredients

[0072] Determination of reference indicators

[0073] The product prepared in this embodiment is mainly used in microwave devices, and its application environment has a great influence on the saturation magnetic induction intensity B of the material. S , Curie temperature T C , residual magnetic induction B r , loss factor tanδ, coercive force H c , The dielectric constant ε has high requirements, and the above-mentioned indicators are mainly used as reference indicators in the process of compound pre-burning, and the corresponding specific scalars are: B S0 =35.5mT, T C0 =170°C;

[0074] Y according to the molecular formula 3 Fe 5 o 12 The main formula of the raw material is compounded, and the compounded raw material is subjected to wet ball milling for 4 hours according to the conventional p...

example 3

[0102] Example 3: In atmosphere Y 1.4 BiIn 0.6 Fe 5 o 12 Low temperature preparation process of ferrite

[0103] Step 1. Prepare raw materials

[0104] Determination of reference indicators

[0105] Y 1.4 BiIn 0.6 Fe 5 o 12 The main reference index of ferrite is: B r ≥24.0mT,T c ≥230°C, H c ≤0.9kA / m, tanδ≤3.8×10 -4 , ΔH≤410, ρ≥3.0×10 10 Ω cm;

[0106] Y according to the molecular formula 3 Fe 5 o 12 The main formula is to compound the raw materials, and the compounded raw materials are wet ball milled for 4 hours according to the conventional process, and then dried;

[0107] Step 2. Duplex pre-firing

[0108] ①. Initial pre-firing

[0109] Since the product does not have any requirements for the atmosphere during the pre-firing process, the powder prepared in step 1 is pre-fired in the muffle furnace for the first time, and the process is as follows:

[0110] The normal temperature is raised to 200°C in 1 hour, to 500°C in 1.5 hours, to 900°C in 3 hours, t...

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Abstract

The invention discloses a compound low-temperature pre-sintering method of ferrite monoliths structure materials, which comprises the steps of: 1. confirming reference indexes, and preparing raw materials; 2. compositely and previously sintering: previously sintering powder materials of the step 1 at least two times, wherein the first previous sintering leads the solid phase reaction to happened among the each raw material, so that all or some of the raw materials are changed into the ferrite to be taken as a base for the second previous sintering; detecting the powder materials after the first previous sintering, and confirming the technology condition of the second previous sintering according to a detecting result, wherein the second previous sintering leads the non-extensive quantity of the galvanomagnetic property in the raw materials to meet or exceeds the requirement of product performance; confirming the temperature and the technology of the nest previous sintering according to the formulation of the materials and the requirement of the product performance; and detecting the powder materials after the previous sintering, wherein if the product performance after the previous sintering can not meet the requirement of the product performance, sintering for several time, and if the product performance after the previous sintering can not meet the requirement of the product performance, granulating and shaping; 3. granulating and shaping; and 4. low-temperature sintering, the temperature of the low-temperature sintering is lower than the maximum temperature in the process of pre-sintering, and the compared with the normal process, the temperature is faster raised.

Description

technical field [0001] The invention relates to a preparation process of a magnetic component material, in particular to a compound pre-sintering low-temperature sintering method of a ferrite monolithic structure material. Background technique [0002] With the rapid development of microwave communication, integrated circuit, computer technology and automatic control technology, modern electronic components are constantly developing in the direction of miniaturization, miniaturization, chip type, and stacked type. The development and application of chip components has become a current research hotspot. In the past 20 years, the application of light, thin, short, small, reliable, low-cost and easy-to-assemble chip passive components in integrated circuits has put forward higher requirements for the sintering process of electronic component materials. As one of its representative ferrite monolithic structure materials, ferrite electromagnetic elements with high resistivity an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/64C04B35/26
Inventor 许启明
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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