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Microwave dielectric ceramic material for multi-layer ceramic capacitor and preparing method of microwave dielectric ceramic material

A technology of microwave dielectric ceramics and multi-layer ceramics, applied in the field of electronic ceramics, can solve the problems of increasing the cost of MLCC, high sintering temperature, inability to meet requirements, etc., and achieve the effect of high quality factor Qf and small temperature coefficient of resonance frequency

Inactive Publication Date: 2016-09-07
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The traditional MLCC dielectric ceramic material mentioned above cannot meet the requirements of MLCC in microwave circuits, mainly reflected in the Qf value and frequency temperature coefficient, and the sintering temperature is high (>1100 ° C), which has a higher impact on the electrode. requirements, thus increasing the cost of MLCC

Method used

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  • Microwave dielectric ceramic material for multi-layer ceramic capacitor and preparing method of microwave dielectric ceramic material
  • Microwave dielectric ceramic material for multi-layer ceramic capacitor and preparing method of microwave dielectric ceramic material
  • Microwave dielectric ceramic material for multi-layer ceramic capacitor and preparing method of microwave dielectric ceramic material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A common Ca-doped (MgZn)TiO 3 The preparation method of system ceramics, concrete steps are as follows:

[0045] Step 1: Ingredients; Mg(OH) 2 powder, ZnO powder, TiO 2 Powder, CaTiO 3 Powder according to molar ratio is 75: 25: 100: 10 component batching forms 100 grams of (Mg x Zn 1-x )TiO 3 ·aCaTiO 3 The mixture, the (Mg x Zn 1-x )TiO 3 ·aCaTiO 3 where x=0.75, a=0.1; the mixture was mixed with deionized water for 5 hours by ball milling to obtain a ceramic slurry;

[0046] Step 2: Dry the ceramic slurry prepared in step 1 and pre-fire to obtain ceramic material, the pre-fire temperature is 880°C, and the pre-fire time is 5 hours;

[0047] Step 3: ball milling and mixing; do not add any composite heat reducer to the ceramic material obtained in step 2, use deionized water as a solvent, and ball mill and mix for 6 hours to obtain a ball mill;

[0048] Step 4: granulation and molding; drying the ball abrasive obtained in step 3, adding 3% of the total mass pe...

Embodiment 2

[0051] A kind of preparation method of microwave dielectric ceramic material for multilayer ceramic capacitor, concrete steps are as follows:

[0052] Step 1: Ingredients; Mg(OH) 2 powder, ZnO powder, TiO 2 Powder, CaTiO 3 Powder according to molar ratio is 75: 25: 100: 10 component batching forms 100 grams of (Mg x Zn 1-x )TiO 3 ·aCaTiO 3 The mixture, the (Mg x Zn 1-x )TiO 3 ·aCaTiO 3 where x=0.75, a=0.1; the mixture was mixed with deionized water for 5 hours by ball milling to obtain a ceramic slurry;

[0053] Step 2: Dry the ceramic slurry prepared in step 1 and pre-fire to obtain ceramic material, the pre-fire temperature is 880°C, and the pre-fire time is 5 hours;

[0054] Step 3: ball milling and mixing; add a composite fever reducer to the ceramic material obtained in step 2, and the composite fever reducer consists of 0.25 grams of BaCO 3 , 0.225 g of B 2 o 3 , 0.075 g of SiO 2 , 0.1 g of Nb 2 o 5 and 0.07 g of Nd 2 o 3 After ball milling, melting, pu...

Embodiment 3

[0058] A kind of preparation method of microwave dielectric ceramic material for multilayer ceramic capacitor, concrete steps are as follows:

[0059] Step 1: Ingredients; Mg(OH) 2 powder, ZnO powder, TiO 2 Powder, CaTiO 3 Powder according to molar ratio is 75: 25: 100: 10 component batching forms 100 grams of (Mg x Zn 1-x )TiO 3 ·aCaTiO 3 The mixture, the (Mg x Zn 1-x )TiO 3 ·aCaTiO 3 where x=0.75, a=0.1; the mixture was mixed with deionized water for 4 hours by ball milling to obtain a ceramic slurry;

[0060] Step 2: Drying the ceramic slurry prepared in Step 1 and then pre-firing to obtain ceramic material, the pre-firing temperature is 900°C, and the pre-firing time is 4 hours;

[0061] Step 3: Ball milling and mixing; Add a composite fever reducer to the ceramic material obtained in step 2, and the composite fever reducer is composed of 0.30 grams of BaCO 3 , 0.25 g of B 2 o 3 , 0.08 g of SiO 2 , 0.08 g of Nb 2 o 5 and 0.05 g of Nd 2 o 3 It is made by b...

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Abstract

The invention discloses a microwave dielectric ceramic material for a multi-layer ceramic capacitor and a preparing method of the microwave dielectric ceramic material, and belongs to the technical field of electronic ceramic. The ceramic material is prepared from calcium-doped (MgZn)TiO3 system ceramic and a composite burning improver through ball milling mixing, granulating, forming, glue discharging and sintering, wherein the main crystal phase of the calcium-doped (MgZn)TiO3 system ceramic is MgTiO3, and the composite burning improver is prepared from BaCO3, B2O3, SiO2 and one or more of Li2CO3, Nb2O5 and Nd2O3. The prepared ceramic material has the advantages that a medium dielectric constant is achieved, sintering can be carried out at the medium temperature, a high Qf value is achieved, and the frequency temperature coefficient is stable. The preparing process is environmentally friendly and free of pollution, and the ceramic material can be used at the microwave frequency band of 300 M-300 GHz, can be widely applied to filters, oscillators and other microwave devices, and is especially suitable for the multi-layer ceramic capacitor.

Description

technical field [0001] The invention belongs to the field of electronic ceramics, in particular to a microwave dielectric ceramic material for a multilayer ceramic capacitor and a preparation method thereof. Background technique [0002] Multilayer Ceramic Capacitors (MLCC for short) is one of the main passive SMD components in the electronic whole machine. It plays the role of filtering, coupling and DC blocking in the electronic circuit, and is widely used in smart phones and tablets. Civilian products and consumer electronics such as computers, radio and television, and mobile communications; military electronic equipment such as aerospace, tank electronics, and weapon warhead control; and the energy industry. At present, MLCC is mainly developing in the direction of miniaturization, high frequency, large capacity and low cost. [0003] Low frequency (1kHz) BaTiO 3 Base MLCC dielectric material and high frequency CaTiO 3 There are many MLCC dielectric materials reporte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/465C04B35/626C04B35/64
CPCC04B35/465C04B35/6261C04B35/62645C04B35/62695C04B35/64C04B2235/3203C04B2235/3206C04B2235/3208C04B2235/3215C04B2235/3224C04B2235/3232C04B2235/3251C04B2235/3284C04B2235/3409C04B2235/3418C04B2235/94C04B2235/95C04B2235/96
Inventor 钟朝位陶煜刘稷陈松
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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