A kind of nanometer microwave dielectric ceramic material and preparation method thereof

A microwave dielectric ceramic and nanotechnology, applied in ceramics, inorganic insulators and other directions, can solve the problems of Q*f value and ceramic reliability decline, poor sintering stability of crystal structure, and difficulty in obtaining pure equality, and achieve good sintering stability, The effect of stable sintering and suitable for large-scale industrialization

Active Publication Date: 2021-04-13
GUANGDONG GOVA ADVANCED MATERIAL TECH
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  • Application Information

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Problems solved by technology

However, due to the poor sintering stability of the crystal structure of this system, it is difficult to obtain a pure phase by traditional preparation methods, and when preparing devices with a slightly larger size, due to Ti 4+ If the content is high, the reduction phenomenon is very easy to appear inside the bulk ceramics, resulting in a decrease in the Q*f value and the reliability of the ceramic, which seriously restricts the further application of the system

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  • A kind of nanometer microwave dielectric ceramic material and preparation method thereof
  • A kind of nanometer microwave dielectric ceramic material and preparation method thereof
  • A kind of nanometer microwave dielectric ceramic material and preparation method thereof

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preparation example Construction

[0054] The present invention also provides a method for preparing the nano-microwave dielectric ceramic material described in the above technical solution, comprising the following steps:

[0055] a) After mixing the rare earth oxide, barium carbonate, aluminum oxide and titanium dioxide, performing the first grinding treatment, and then pre-sintering to obtain a pre-sintered powder;

[0056] b) crushing and sieving the calcined powder obtained in step a), mixing it with a sintering aid, performing a second grinding treatment, and then sequentially performing compression molding and sintering to obtain a nano-microwave dielectric ceramic material.

[0057] In the invention, the rare earth oxide, barium carbonate, aluminum oxide and titanium dioxide are firstly mixed, and then the first grinding treatment is carried out, and then the pre-sintering is carried out to obtain the pre-sintered powder. In the present invention, there is no special limitation on the sources of the rar...

Embodiment 1

[0078] (1) Magnesium oxide, niobium pentoxide, yttrium oxide, cerium oxide and manganese carbonate with a molar ratio of 4:1:0.004:0.53:0.088 are mixed in deionized water, and the quality of the deionized water is the total amount of the powder. 80% of the mass, stirred in a high-speed mixer for 12 hours; then spray-dried with spray drying equipment to obtain dried powder particles; then sieved the dried powder particles with 120 mesh and 240 mesh to remove fine powder and Coarse powder to obtain powder after sieving.

[0079] (2) Put the sieved powder obtained in step (1) in a corundum crucible, and calcinate at 1085° C. for 105 min in an oxidizing atmosphere to obtain a composite oxide powder.

[0080] (3) Mix the composite oxide powder obtained in step (2) with 60% deionized water relative to the mass of the powder, and after stirring for 30 minutes, introduce it into a ball mill tank for ball milling until the particle size D50 is 3.0 μm to 4.0 μm , when the maximum parti...

Embodiment 2～25

[0082] (1) The rare earth oxide (Ln 2 o 3 ), barium carbonate, aluminum oxide and titanium dioxide are mixed and stirred evenly with a mixer, fermented with pure water for 24 hours, then sand-milled with a sand mill until the particle size range is 0.1 μm≤D0.5≤0.3 μm, discharged, and spray-dried to obtain The powder after the first grinding process; the Ln 2 o 3 The chemical composition is specifically aLa 2 o 3 -bSm 2 o 3 -cNd 2 o 3 .

[0083] (2) Pre-sintering the powder after the first grinding treatment obtained in step (1) at a temperature of 1000° C. to 1350° C. for 3 hours to 8 hours to obtain a calcined powder.

[0084] (3) The calcined powder obtained in step (2) is pulverized, passed through an 80-mesh sieve, and mixed with the sintering aid provided in Example 1. 0.3% to 0.8%, stir evenly with a mixer, and add dispersant, defoamer, defoamer to control the pH of the slurry between 6 and 8, and then sand again with a sand mill until the particle size range i...

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Abstract

The invention provides a nano-microwave dielectric ceramic material prepared from a mixture comprising a composite oxide and a sintering aid; the composite oxide has a general formula shown in formula (I): xLn 2 o 3 ‑yBaO‑zAl 2 o 3 ‑wTiO 2 ; In formula (I), 0<x≤10, 0≤y≤10, 0≤z≤1, 0<w≤20. Compared with the prior art, the nano-microwave dielectric ceramic material provided by the present invention takes the composite oxide of the above-mentioned specific general formula as the main component, and its crystal structure changes from the perovskite structure as the ratio of x, y, z, and w changes. Transforming to the composite perovskite structure and then to the black bronze structure, the BaO‑Ln 2 o 3 -TiO 2 (Ln: La\Sm\Nd) system microwave dielectric ceramic material is effectively improved; the nano-microwave dielectric ceramic material also has a high dielectric constant, extremely low dielectric loss and good sintering stability, and at the same time resonant The frequency temperature coefficient is adjustable, and it has very broad application prospects in the field of microwave communication.

Description

technical field [0001] The invention relates to the technical field of new materials and microwave communication, and more specifically relates to a nano-microwave dielectric ceramic material and a preparation method thereof. Background technique [0002] As a next-generation mobile communication technology, LTE has become an inevitable path for communication operators to develop future communication networks. However, many challenges such as tight spectrum resources, high energy consumption, and high costs also make operators face more severe cost pressures. In 2015, my country can plan about 1000MHz bandwidth spectrum resources for public mobile communications, but there is still a gap of about 300MHz from the total bandwidth demand of 1360MHz estimated by the Ministry of Industry and Information Technology Research Institute of Telecommunications. Spectrum resources are tight, and improving spectrum utilization has become a top priority. [0003] Microwave dielectric cer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B3/12C04B35/50C04B35/46C04B35/64
CPCC04B35/46C04B35/50C04B35/64C04B2235/3215C04B2235/3217C04B2235/3224C04B2235/3227C04B2235/3232C04B2235/3251C04B2235/5445
Inventor 马才兵周星星刘超吴悦广殷旺吕开明
Owner GUANGDONG GOVA ADVANCED MATERIAL TECH
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