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Lithium-based microwave dielectric ceramic material, preparation method thereof 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, deterioration of silver electrodes, difficult to match co-firing of silver electrodes, etc., achieve simple chemical composition and preparation process, improve frequency temperature coefficient, and improve sintering. The effect of compactness

Active Publication Date: 2021-04-06
LUOYANG ZHONGCHAO NEW MATERIAL SHARES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The resonant frequency temperature coefficient of the material is high (-47.2~-20.7ppm / ℃), and the additive V 2 o 5 Adverse effects in the preparation of cast tape
Invention patent "Low-temperature sintering of lithium-based zinc-titanium microwave dielectric ceramics and its preparation method" CN102617127A discloses a sintering aid for sintering below 900°C as H 3 BO 3 Or ZBS (60wt%-ZnO, 30wt%-B 2 o 3 , 10wt%-SiO 2 ) of Li 2 ZnTi 3 o 8 Ceramic materials, the sintering aid added to the material deteriorates the dielectric properties of the material system
The invention patent "a low-temperature co-fired microwave dielectric ceramic material and its preparation method" CN102381874B discloses a Li 2 ZnTi 3 o 8 Ceramic materials, in which the low melting point substance is Li 2 O-ZnO-B 2 o 3 or Li 2 O-B 2 o 3 -SiO 2 Glass, the sintering holding time of this material is 4h, the silver electrode is easy to ablate if the holding time is long, and the overall Q×f of this material sintered at about 875°C is slightly low, and the overall performance of the prepared material is not good due to different additions of auxiliary components , Q×f value and τ f Can't take care of it well, for example: Li 2 ZnTi 3 o 8 Add 1wt% LBS, 5wt% TiO 2 , sintered at 875°C for 4h, ε r =26.0, Q×f=24079GHz, τ f =1.6×10 -6 ppm / ℃, mainly adding Li 2 O-B 2 o 3 -SiO 2 Glass deteriorates Li 2 ZnTi 3 o 8 The dielectric properties of the system
[0005] In summary, the development of a low-temperature sintered medium dielectric constant lithium-based microwave dielectric ceramic material and its preparation method can overcome the high sintering temperature and long holding time of existing lithium-based microwave dielectric materials, which are difficult to match with silver electrodes for co-firing As well as the adverse effects of additives on dielectric properties and other deficiencies, it is very necessary

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  • Lithium-based microwave dielectric ceramic material, preparation method thereof and lithium-based microwave dielectric ceramic
  • Lithium-based microwave dielectric ceramic material, preparation method thereof and lithium-based microwave dielectric ceramic
  • Lithium-based microwave dielectric ceramic material, preparation method thereof 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 lithium-based microwave dielectric ceramic material is prepared from the following raw materials: main powder shown as a formula (I) and auxiliary powder, wherein the auxiliary powder comprises glass powder accounting for 0.5-1.5 wt% of the main powder and rutile type TiO2 micro powder accounting for 5-10wt% of the main powder; and the formula (I) isLi < 2 > (Zn (1-x) Cux) (Ti (1-y) (Mg < 1 / 3 > Nb < 2 / 3 >) y) 3O8. The specific glass powder reduces the sintering temperature of the system, Mg < 2 + > and Nb < 5 + > are introduced to replace Ti < 4 + > to improve the frequency temperature coefficient, TiO2 is introduced to improve the sintering compactness of the Li2CO3-ZnO-TiO2 system, and the tau < f > value can be adjusted. Cu < 2 + > substitution and specific glass powder successfully enable a Li2CO3-ZnO-TiO2 system to be completely sintered at 850-890 DEG C and to have excellent dielectric properties, so that the material can be co-sintered with an Ag electrode.

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

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IPC IPC(8): C04B35/462C04B35/622C04B35/626C04B35/64C03C6/04C03C1/02C03B5/16
CPCC04B35/462C04B35/622C04B35/62605C04B35/62645C04B35/64C03C1/00C03C1/02C03B5/16C04B2235/3203C04B2235/3206C04B2235/3284C04B2235/3251C04B2235/3281C04B2235/365C04B2235/3232C04B2235/5445C04B2235/5436C04B2235/5454C04B2235/656C04B2235/6567C04B2235/96
Inventor 马丹丹周世平周纪平温俊磊李武裴广斌
Owner LUOYANG ZHONGCHAO NEW MATERIAL SHARES CO LTD