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Low-loss dielectric adjustable mediation microwave dielectric ceramic material and preparation method thereof

A microwave dielectric ceramic and low-loss technology, which is applied in the field of low-loss dielectric adjustable intermediate microwave dielectric ceramic materials and its preparation, can solve the problems of unfavorable independent technological progress, large foreign exchange cost, and expensive raw materials, and achieve low price and low cost. The effect of reducing production cost and raw material cost

Active Publication Date: 2016-02-03
SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CaTiO used in domestic industrial production 3 -NdAlO 3 The series of ceramics are mainly purchased from Japan for the synthesis of ceramic powder, which costs a lot of foreign exchange and is not conducive to independent technological progress
In addition, the rare earth oxide Nd 2 o 3 The raw material is expensive, the price is for CaTiO 3 -NdAlO 3 Commercial application promotion of microwave dielectric ceramics is a very big limiting factor

Method used

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  • Low-loss dielectric adjustable mediation microwave dielectric ceramic material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0035] According to the general formula 0.31Ca(Zr x Ti 1-x )O 3 +0.69LaAlO 3 Batching prepares ceramics of the present invention through the following steps:

[0036] (1) Using analytically pure chemical reagent CaCO 3 , ZrO 2 、TiO 2 , La 2 o 3 、Al 2 o 3 As raw material, according to 0.31Ca (Zr x Ti 1-x )O 3 +0.69LaAlO 3 The molar ratio of the general chemical formula, where 0≤x≤0.06. Put the prepared raw materials into a 50KG horizontal ceramic ball mill for ball milling for 16 hours to obtain a slurry with a particle size of 2.3 μm;

[0037] (2) After drying the ball-milled slurry, press it into a large sheet with a diameter of 50 mm under a pressure of 30 MPa, and pre-burn it at 1260 ° C for 4 hours at a heating rate of 4 ° C / min to obtain a sintered block;

[0038] (3) Cross 50 mesh sieves after the block after pre-burning is pulverized, add the PVA (PVB, CMC all can) of powder material 0.5%, 0.1% sodium polyacrylate, 0.05% tributyl phosphate, to remove I...

Embodiment 6-9

[0046] According to the general formula 0.31Ca(Zr 0.02 Ti 0.98 )O 3 +0.69La 1+y AlO 3 Ingredients, using the same preparation method as in Example 1 to prepare a microwave dielectric ceramic material, the chemical formula of the prepared microwave dielectric ceramic material is 0.31Ca(Zr 0.02 Ti 0.98 )O 3 +0.69La 1+y AlO 3 , where y is respectively 0, 0.01, 0.03, 0.05, respectively corresponding to embodiment 6-9, the microwave dielectric ceramic material prepared in embodiment 6-9 is subjected to performance test, adopting Agilent8722ET network analyzer (open cavity method) analysis For the relative permittivity and quality factor of the material, use the Agilent8722ET network analyzer and a precision thermostat to measure the temperature coefficient of the resonant frequency of the material, and the test temperature range is -40°C to 80°C. The test results are shown in Table 2.

[0047] Table 20.31Ca(Zr 0.02 Ti 0.98 )O 3 +0.69La 1+y AlO 3 Ceramic microwave diel...

Embodiment 10-14

[0050] According to the general formula 0.31Ca(Zr 0.02 Ti 0.98 )O 3 +0.69La 1.003 AlO 3 +zwt%Al 2 o 3 Ceramics of the present invention are prepared through the following steps:

[0051] (1) Using analytically pure chemical reagent CaCO 3 , ZrO 2 、TiO 2 , La 2 o 3 、Al 2 o 3 As raw material, according to 0.31Ca (Zr 0.02 Ti 0.98 )O 3 +0.69La 1.003 AlO 3 Put the prepared raw materials into a 50KG horizontal ceramic ball mill for ball milling for 16 hours to obtain a slurry with a particle size of 2.3 μm;

[0052] (2) After drying the ball-milled slurry, press it into a large sheet with a diameter of 50 mm under a pressure of 30 MPa, and pre-burn it at 1260 ° C for 4 hours at a heating rate of 4 ° C / min to obtain a sintered block;

[0053] (3) After crushing the calcined block, pass it through a 50-mesh sieve, and add 0-0.6% Al 2 o 3 , 0.5% PVA (PVB, CMC all can), 0.1% sodium polyacrylate, 0.05% tributyl phosphate, with deionized water as the ball milling med...

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Abstract

The invention particularly relates to a low-loss dielectric-adjustable mediation microwave dielectric ceramic material and a preparation method thereof. The chemical composition of the ceramic material is aCa(ZrxTi1-x)O3 plus (1-a)La1 plus yAlO3 plus z wt percent of Al2O3, wherein a is greater than or equal to 0.30 and less than or equal to 0.35, x is greater than or equal to 0 and less than or equal to 0.1, y is greater than or equal to 0 and less than or equal to 0.01 and z is greater than or equal to 0 and less than or equal to 1. The ceramic material is low-cost CaTiO3-LaAlO3 system microwave dielectric ceramic capable of replacing CaTiO3-NdAlO3 system ceramic, greatly reduces the production cost, is a low-cost microwave dielectric ceramic material having low loss and dielectric-adjustable characteristic and being applicable to the microwave devices such as a dielectric resonator, a filter and a duplexer, a dielectric constant is adjustable, Q multiplied by f is high, and a temperature coefficient of resonance frequency tao f is excellent. The invention also provides the preparation method of the ceramic material with the advantages of low material price and simple and practicable process route.

Description

technical field [0001] The invention specifically relates to a low-loss dielectric adjustable intermediate microwave dielectric ceramic material and a preparation method thereof. Background technique [0002] With the rapid development of modern communication technology, especially the rapid advancement of 4G and 5G networks, miniaturization, integration and cost reduction have become the development direction of mobile communication and mobile terminals. The way to achieve miniaturization, high stability and low cost of communication equipment is the integration of microwave circuits. Traditional metal resonators and metal waveguides are too bulky and heavy, which limits the development of microwave integrated circuits. Therefore, it is necessary to develop a series of electronic materials and components suitable for high performance and high reliability in the microwave range. Microwave dielectric ceramic with medium dielectric constant and high quality factor is the best...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/44C04B35/622
Inventor 高勇李伶王重海赵小玻张萍萍王营营车松蔚宋涛
Owner SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS