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Composite microwave ceramic materials with dielectric adjustable and method for preparing same

A microwave ceramic and dielectric technology, applied in the field of microwave ceramic materials and their preparation, can solve the problems of undiscovered dielectric adjustability of low-fired microwave materials, inability to overcome high sintering temperature, and deterioration of dielectric adjustability rate, etc. Toxic and side effects, low cost, low sintering temperature effect

Inactive Publication Date: 2009-01-07
TONGJI UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the sintering temperature of materials modified by these methods is generally around 1400°C, which cannot overcome the defect of high sintering temperature, and the dielectric tunability will deteriorate rapidly due to the introduction of the second phase.
These limit its application in ferroelectric phase shifters
[0009] According to literature search, the current improvement of barium titanate materials is mainly to improve the comprehensive dielectric properties of barium titanate materials by ion substitution, doping modification or composite low-loss microwave dielectric materials in barium titanate materials. Its adaptability in device applications, did not find any report on the dielectric tunability of low-fever microwave materials and barium titanate composites

Method used

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  • Composite microwave ceramic materials with dielectric adjustable and method for preparing same
  • Composite microwave ceramic materials with dielectric adjustable and method for preparing same
  • Composite microwave ceramic materials with dielectric adjustable and method for preparing same

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preparation example Construction

[0034] BaTiO provided by the present invention 3 -AMP 2 o 7 The preparation method of dielectrically adjustable microwave composite ceramics specifically includes the following steps:

[0035](1) AMP 2 o 7 The powder is prepared by the traditional solid state reaction method. Choose CaCO 3 (purity 99.99%), SrCO 3 (99%), ZnO(99%), CuO(98%), (NH 4 ) 2 HPO 4 (98%) (its raw materials are all provided by Sinopharm Chemical Reagent Co., Ltd.) as the main raw material, according to a certain molar ratio of ingredients, the prepared raw materials are placed in the nylon ball mill tank, add zirconia balls and dehydrated alcohol or and remove Ionized water ball mill for 24 hours, after the discharge is dried, it is pre-fired at 550 ° C ~ 900 ° C for 1-5 hours, and AMP is obtained after grinding 2 o 7 Powder spare.

[0036] (2) Weigh BaTiO 3 (99.90%, 100nm, provided by Shandong Guoci Functional Ceramic Material Co., Ltd.) powder, AMP 2 o 7 Powder, after mixing, put it in a...

Embodiment 1

[0040] Example 1AMP 2 o 7 preparation of

[0041] According to the molecular formula, according to the ingredients in the following table, weigh CaCO 3 , SrCO 3 , ZnO, CuO, (NH 4 ) 2 HPO 4 , put the prepared raw materials in a nylon ball mill tank, add zirconia balls and absolute ethanol or deionized water ball mill for 24 hours, and pre-calcine at 550°C to 880°C for 1-5 hours after discharging the material, after grinding get AMP 2 o 7 , the weight (g) of each raw material that participates in reaction and the corresponding reaction product that obtains are listed in table 1:

[0042] Table 1

[0043]

Embodiment 2～9

[0044] Embodiment 2~9 prepares BaTiO 3 -AMP 2 o 7 (A=Sr, M=Cu) composite ceramics

[0045] Weigh the BaTiO respectively according to the composition ratio in the formula in Table 2 3 , SrCuP 2 o 7 Powder. Put the mixture of each formula in the embodiment into a nylon ball mill jar, add zirconia balls and absolute ethanol ball mill for 24 hours, and after drying, the powder passes through a 200-mesh sieve. According to the traditional electronic ceramic preparation process, use 8% Polyvinyl alcohol (PVA) is used as a binder for granulation, and under a pressure of 10MPa, it is dry-pressed into a diameter green sheet and h=5mm, h=7mm, h=9mm, h = 12mm cylinder, after 550 ° C debonding treatment, the sample is sintered in the air atmosphere, the sintering temperature is in the range of 950 ° C - 1300 ° C, after holding for 2 hours, BaTiO is obtained 3 -AMP 2 o 7 (A=Sr, M=Cu) two-phase composite ceramic samples.

[0046] Table 2

[0047]

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Abstract

The invention belongs to the technical field of electronic materials and devices, and discloses a dielectric adjustable compound microwave ceramic material and a preparation method thereof. The compound microwave ceramic material is prepared by compounding AMP2O7 with BTO. The components of the compound microwave ceramic material and the percentage compositions of the components by weight are as follows based on the total weight of the compound microwave ceramic material: 50.0 to 97.5 percent of BaTiO3; and 2.5 to 50.0 percent of AMP2O7, in which A is Ca or Sr, and M is Zn or Cu. The traditional electronic ceramic preparation process adopted is simple; the cost is low; the material system is environment-friendly without toxicity or side effect; the compound microwave ceramic material has remarkable performance, and is applicable for development and design of adjustable microwave devices.

Description

technical field [0001] The invention belongs to the technical field of electronic materials and devices, and in particular relates to microwave ceramic materials and their preparation. Background technique [0002] Barium titanate (BaTiO 3 , BTO) is a typical perovskite structure (ABO 3 ) ferroelectric materials have excellent dielectric nonlinearity, that is, the nonlinear characteristic that the dielectric constant changes with the applied electric field. The dielectric constant, and then control the wave velocity and wavelength of the electromagnetic wave, in order to achieve the change of the phase shift. And because of its high dielectric constant, the size of components can be greatly reduced, which conforms to the trend of miniaturization in the development of modern devices. Because of its excellent properties, it is generally favored by people and has become one of the most promising dielectric materials for microwave phase shifters. [0003] As a microwave tuna...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468
Inventor 翟继卫姜海涛
Owner TONGJI UNIV
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