A kind of lithium-based microwave dielectric ceramic material, its preparation method and lithium-based microwave dielectric ceramic

A technology of microwave dielectric ceramics and ceramic materials, applied in the field of materials, can solve the problems of easy ablation and deterioration of silver electrodes, and difficult matching and co-firing of silver electrodes, etc., achieve simple chemical composition and preparation process, improve frequency temperature coefficient, and improve sintering compactness effect

A technology of microwave dielectric ceramics and ceramic materials, applied in the field of materials, can solve the problems of easy ablation and deterioration of silver electrodes, and difficult matching and co-firing of silver electrodes, etc., achieve simple chemical composition and preparation process, improve frequency temperature coefficient, and improve sintering compactness effect

CN112608144BActive Publication Date: 2022-01-28LUOYANG ZHONGCHAO NEW MATERIAL SHARES CO LTD
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  • A kind of lithium-based microwave dielectric ceramic material, its preparation method and lithium-based microwave dielectric ceramic
  • A kind of lithium-based microwave dielectric ceramic material, its preparation method and lithium-based microwave dielectric ceramic
  • A kind of lithium-based microwave dielectric ceramic material, its preparation method and lithium-based microwave dielectric ceramic

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preparation example Construction

[0044] The preparation method of the main powder shown in the formula (I) of the present invention is preferably specifically:

[0045] Li 2 CO 3 , ZnO, TiO 2 , CuO, MgO and Nb 2 o 5 It is obtained by mixing according to the metering ratio, wet grinding, drying, calcining and crushing.

[0046] Li of the present invention 2 CO 3 , ZnO, TiO 2 , CuO, MgO and Nb 2 o 5 The purity is ≥99%. The present invention does not limit its source, and it can be purchased commercially.

[0047] Firstly, the raw materials are pretreated, specifically ZnO and MgO.

[0048] The pretreatment specifically includes: ZnO is pre-fired at 600-700°C for 4-5 hours; preferably at 650-700°C for 4-4.5 hours; more preferably at 700°C for 4 hours;

[0049] MgO is kept at 700-800°C for 4-5h; preferably at 750-800°C for 4-4.5h; more preferably at 800°C for 4h;

[0050] The particle size of the MgO is 40-80nm.

[0051] Then to Li 2 CO 3 , ZnO, TiO 2 , CuO, MgO and Nb 2 o 5 Mix according to the...

Embodiment 1

[0102] A low-temperature sintered medium dielectric constant lithium-based microwave dielectric ceramic material and a preparation method thereof. The raw material of the lithium-based microwave dielectric ceramic material consists of main powder and auxiliary powder. The chemical formula of the main powder is: Li 2 (Zn (1-x) Cu x )(Ti (1-y) (Mg 1 / 3 Nb 2 / 3 ) y ) 3 o 8 , where 0≤x≤0.1, 0≤y≤0.2; additional auxiliary powders include glass frit accounting for 0.5-1.5% relative to the main powder and rutile-type TiO accounting for 5-10% relative to the main powder 2 Micronized. Wherein the glass powder is a mixture containing alkali metals and alkaline earth metals obtained by smelting and grinding Li 2 O-Al 2 o 3 -B 2 o 3 -ZnO-SiO 2 -Na 2 O-K 2 O-BaO-La 2 o 3 glass system. It is made by mixing in a ball mill, drying, granulating, molding and sintering.

[0103] 1) Synthesize the main powder: Li with purity ≥ 99% 2 CO 3 , ZnO, TiO 2 , CuO, MgO and Nb 2 o 5...

Embodiment 2

[0119] A low-temperature sintered medium dielectric constant lithium-based microwave dielectric ceramic and a preparation method thereof. The raw material of the lithium-based microwave dielectric ceramic is Li 2 (Zn (1-x) Cu x )(Ti (1-y) (Mg 1 / 3 Nb 2 / 3 ) y ) 3 o 8 Main powder and auxiliary powder Li 2 O-Al 2 o 3 -B 2 o 3 -ZnO-SiO 2 -Na 2 O-K 2 O-BaO-La 2 o 3 System glass powder and TiO 2 constitute.

[0120] 1) Synthesize the main powder: Li with purity ≥ 99% 2 CO 3 , ZnO, TiO 2 , CuO, MgO and Nb 2 o 5 As the main raw material, follow the steps below:

[0121] a. Raw material pretreatment: ZnO is pre-fired at 700°C for 4 hours, and MgO with a particle size of 40-80nm is pre-fired at 800°C for 4 hours for later use;

[0122] b. Ingredients weighing: according to Li 2 Zn(Ti 0.95 (Mg 1 / 3 Nb 2 / 3 ) 0.05 ) 3 o 8 To measure and weigh;

[0123] c. Wet ball milling: use pure water as the grinding liquid for the powder obtained in b, and ball mill for 4...

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Abstract

The invention provides a lithium-based microwave dielectric ceramic material. The raw materials include: main powder and auxiliary powder shown in formula (I); the auxiliary powder includes glass powder and 0.5-1.5 wt% of the main powder Accounting for 5-10wt% rutile TiO in the main powder 2 Micropowder; Li 2 (Zn (1‑x) Cu x )(Ti (1‑y) (Mg 1 / 3 Nb 2 / 3 ) y ) 3 o 8 , formula (I). The specific glass powder of the present invention reduces the sintering temperature of the system and introduces Mg 2+ , Nb 5+ replace Ti 4+ Improve frequency temperature coefficient, introduce TiO 2 Can increase Li 2 CO 3 ‑ZnO‑TiO 2 The sintering density of the system can be adjusted by τ f value. Cu 2+ Substitution and specific glass frits successfully make Li 2 CO 3 ‑ZnO‑TiO 2 The system is perfectly sintered at 850-890°C and has excellent dielectric properties, so that the material can be co-fired with Ag electrodes.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a low-temperature sintered medium dielectric constant lithium-based microwave dielectric ceramic material, a preparation method thereof and a lithium-based microwave dielectric ceramic. Background technique [0002] With the continuous development of electronic information technology in the direction of high frequency and digitalization, the requirements for the integration and modularization of components and circuits are becoming more and more urgent. The electrical, mechanical, process characteristics and high reliability have become one of the hotspots in the modularization of electronic devices. With the advancement of science and technology, LTCC technology has put forward higher requirements for microwave dielectric ceramic materials: (1) excellent microwave dielectric properties, suitable dielectric constant, low loss, and near-zero resonance frequency temperature coeff...

Claims

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Application Information

Patent Timeline
28 Jan 2022
Publication
CN112608144B
IPC
C04B35/462; C04B35/622; C04B35/626; C04B35/64; C03C6/04; C03C1/02; C03B5/16
CPC
C04B35/462; C04B35/622; C04B35/62605; C04B35/62645; C04B35/64; C03C1/00; C03C1/02; C03B5/16
Inventors
马丹丹; 周世平