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Microwave medium ceramic material and preparation method thereof

A microwave dielectric ceramic and ceramic technology, which is applied in the field of electronic ceramics and its manufacturing, can solve the problems of narrow dielectric constant adjustment range, abnormal growth of crystal grains, insufficient density of crystal grains, etc., and achieves low price, simple preparation method, and sintering. The effect of a wide temperature range

Active Publication Date: 2017-09-22
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Application Information

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Problems solved by technology

From the above data it can be seen that: (Ca 0.6 Li 0.14 SM 1.26 )TiO 3 The temperature stability coefficient of the resonant frequency of ceramics is not close to zero, and the adjustment range of the dielectric constant is narrow; at the same time, there are still the following deficiencies: for example, the crystal grains are not dense enough, the crystal grains grow abnormally, and lithium volatilization is serious. These deficiencies have affected ( Ca 0.6 Li 0.14 SM 1.26 )TiO 3 Application in industry

Method used

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  • Microwave medium ceramic material and preparation method thereof

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Effect test

Embodiment 1

[0057] Step 1: batching; With 15.604g calcium carbonate, 2.436g lithium carbonate, 41.507g titanium dioxide, 38.052g samarium oxide according to general chemical formula (Ca 0.6 Li 0.14 SM 1.26 )TiO 3 Dosing is carried out to form the first mixture; Lanthanum oxide and aluminum oxide are mixed according to LaAlO 3 Perform batching to form a second mixture, the percentages of the second mixture and the first mixture accounting for the total mass are respectively 97.6% and 2.4%;

[0058] Step 2: ball milling; using zirconia balls as the ball milling medium, the mixture obtained in step 1 is ground according to the mass ratio of mixture: balls: deionized water is 1:5:1.5, and the milling time is 6 hours to obtain a uniformly mixed Ball abrasive;

[0059] Step 3: drying and sieving; drying the ball mill material obtained in step 2 at 100°C and passing it through a 60-mesh sieve to obtain a dry powder;

[0060] Step 4: Pre-sintering; the dry powder obtained in step 3 is pre-si...

Embodiment 2

[0066] In this embodiment, except that the sintering temperature in step 8 is 1335° C., other operations are the same as in embodiment 1.

Embodiment 3

[0068] In this embodiment, except that the sintering temperature in step 8 is 1350° C., other operations are the same as in embodiment 1.

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Abstract

The invention discloses a microwave medium ceramic material and a preparation method thereof, and belongs to the field of electronic ceramics and manufacturing of the electronic ceramics. The preparation method of the ceramic material provided by the invention comprises the following steps of performing ball milling mixing, granulation, shaping, rubber discharging and sintering on 96.4 to 97.6 mass percent of (CaLiSm)TiO3 system ceramics and 2.4 to 3.6 mass percent of doping agents to prepare the microwave medium ceramic material using CaTiO3 as a main crystal phase. A quality factor is not obviously reduced; meanwhile, regulating a frequency temperature coefficient to a value near zero is realized; a dielectric constant is adjustable; the lithium volatilization in the ceramic material is inhibited; the crystal particle abnormal increase phenomenon is relieved; the structure compactness of the ceramic material is improved. Meanwhile, the ceramic material provided by the invention has the advantages that the process is simple; the sintering temperature range is wide; good process adaptability is realized; the industrial production is easy; the requirements in microwave communication industry can be favorably met.

Description

technical field [0001] The invention belongs to the field of electronic ceramics and its manufacture, and in particular relates to a high-dielectric and low-loss microwave dielectric ceramic material and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics (MWDC) refer to ceramics that are used as dielectric materials in microwave frequency bands (mainly UHF, SHF bands, 300MHz-300GHz) circuits and perform one or more functions. It is the basis of modern communication technology. [0003] The way to achieve miniaturization, high stability and low cost of microwave equipment is the integration of microwave circuits. Due to the excessive volume and weight of metal resonators and metal waveguides, the development of microwave integrated circuits is limited, and microwave hybrid integrated circuits composed of resonators made of microwave dielectric ceramics, microwave tubes, and microstrip lines can make the device size reach millimeters. le...

Claims

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Application Information

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IPC IPC(8): C04B35/462C04B35/64C04B35/626
CPCC04B35/462C04B35/6261C04B35/64C04B2235/3203C04B2235/3208C04B2235/3217C04B2235/3224C04B2235/3227
Inventor 钟朝位赵昱谢林杉
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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