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Microwave dielectric ceramic material with high Qf and high strength and preparation method thereof

A microwave dielectric ceramic, high-strength technology, applied in the field of information functional materials, can solve the problems of precision deviation, cracking, insufficient bending strength, etc., and achieve the effect of good material uniformity and good uniformity

Inactive Publication Date: 2020-06-19
XIAMEN SUNYEAR ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the bending strength is also an important factor in determining whether the two dielectric ceramic devices can be combined accurately. Insufficient bending strength will lead to deviations in accuracy during welding or combination, and even cause adverse consequences such as cracking.

Method used

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  • Microwave dielectric ceramic material with high Qf and high strength and preparation method thereof
  • Microwave dielectric ceramic material with high Qf and high strength and preparation method thereof
  • Microwave dielectric ceramic material with high Qf and high strength and preparation method thereof

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preparation example Construction

[0025] The present invention also provides a method for preparing the microwave dielectric ceramic material with high Qf and high strength as above, comprising the following steps:

[0026] ① Preparation of main material Ca 1+x ln 2x al y Ti x / 2 o 4 Powder, synthesized by solid phase method. Preferably, it is obtained according to the following steps: first, high-purity, ultrafine calcium carbonate, rare earth oxides, alumina and titanium dioxide are mixed in molar ratio (1.35~1.65):(0.35~0.65):(0.35~0.45):(0.175 ~0.325) mixed to obtain a solid mixture; the rare earth oxide is selected from one or more of samarium oxide, neodymium oxide and lanthanum oxide; then add deionized water according to the ratio of solid-liquid mass ratio 1:(1~2), place Put it into a ball mill for wet ball milling; after ball milling, use a spray drying tower or other methods to dry to remove moisture, and then calcinate in an air furnace at a temperature range of 1200°C to 1250°C for 2 to 4 hour...

Embodiment

[0036] This embodiment provides a microwave dielectric ceramic material with high Qf and high strength, which is prepared through the following steps and subjected to a microwave performance test.

[0037] ① Preparation of main material Ca 1+x ln 2x al y Ti x / 2 o 4 Powder: first mix high-purity, ultra-fine calcium carbonate, rare earth oxides, aluminum oxide and titanium dioxide according to the molar ratio in Table 1 to obtain five groups of solid mixtures; wherein, the rare earth oxides are selected from samarium oxide, neodymium oxide and lanthanum oxide one or more of . Then add deionized water according to the ratio of solid to liquid mass ratio of 1:1.5, put it into a ball mill for wet ball milling; after ball milling, dry it with a spray drying tower to remove moisture, and then calcinate it in an air furnace at a temperature of 1250°C 3h to get Ca 1+x ln 2x al y Ti x / 2 o 4 powder.

[0038] Table 1Ca 1+x ln 2x al y Ti x / 2 o 4 Example formulation

[0039...

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Abstract

The invention provides a microwave dielectric ceramic material with high Qf and high strength, which relates to the field of information functional materials. The ceramic material comprises a main material and a modified additive, wherein the main material comprises Ca1+xLn2xAlyTix / 2O4.zCaTiO3, Ln is selected from one or more of La, Sm and Nd, x is larger than 0.35 and smaller than 0.65, y is larger than 0.70 and smaller than 0.90, and z is larger than 0.001 and smaller than 0.01; and the modified additive is selected from one or more of MnCO3, MnO2, MgO, Nb2O5, Co2O3 and Sb2O3. The ceramic dielectric material disclosed by the invention is a lead-free environment-friendly material; Ca1+xLn2xAlyTix / 2O4 is synthesized by adopting a solid-phase synthesis method, CaTiO3 is combined as the mainmaterial, the modified additive is doped, the formula is reasonably designed, the synthesis process is optimized, the average particle size of the prepared powder is 400 to 600 nm, an electronic ceramic device prepared from the powder can be sintered into ceramic within the temperature range of 1500-1540 DEG C, the dielectric constant epsilon of the electronic ceramic device ranges from 19 to 22,the quality factor Qf value is larger than or equal to 60000 GHz, and the temperature coefficient tauf is (-40 DEG C to 85 DEG C): + / -5 ppm / DEG C. The material is good in uniformity, and the bendingstrength reaches 350 MPa or above.

Description

technical field [0001] The invention belongs to the field of information functional materials, in particular to a microwave dielectric ceramic material with high Qf and high strength and a preparation method thereof. Background technique [0002] Microwave dielectric ceramic materials are a new type of functional ceramic materials developed rapidly in recent years. It has the characteristics of low dielectric loss, high dielectric constant ε and stable temperature coefficient of dielectric constant τf. It is the core basic material of new microwave circuits and devices including dielectric resonators, filters, oscillators, duplexers, antennas, dielectric substrates, etc. It is widely used in modern microwave communication and satellite navigation systems and equipment. In recent years, due to the rapid development of microwave technology equipment towards miniaturization, integration, and low power consumption, especially towards large quantities and low prices for civilian...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/622C04B35/638
CPCC04B35/462C04B35/622C04B35/638C04B2235/3206C04B2235/3208C04B2235/3217C04B2235/3236C04B2235/3251C04B2235/3262C04B2235/3267C04B2235/3275C04B2235/3294C04B2235/6562C04B2235/6567C04B2235/662C04B2235/96
Inventor 张军志杨和成罗超
Owner XIAMEN SUNYEAR ELECTRONICS CO LTD