MgTiO3-Based microwave dielectric composite ceramic and preparation method thereof

A technology of microwave dielectric and composite ceramics, applied in ceramics, inorganic insulators, etc., can solve the problems of difficult sintering of materials and low dielectric loss, and achieve the effect of reducing porosity, low dielectric loss, and saving resources and energy.

Inactive Publication Date: 2018-09-28
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Abstract
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  • Claims
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Problems solved by technology

Literature shows (K.Wakino.Recent development of dielectric resonatormaterials and filters in Japan.Ferroelectrics,1989,91:69-86), calcium strontium titanate has a high ε r value and positive τ f value, but the addition of calcium strontium titanate improves the MgTiO 3 There are few literatures on the performance research of dielectric ceramics. The possible reason is that the material is difficult to sinter and compact.
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  • MgTiO3-Based microwave dielectric composite ceramic and preparation method thereof
  • MgTiO3-Based microwave dielectric composite ceramic and preparation method thereof

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[0030] MgTiO proposed by the present invention 3 A corresponding preparation method of microwave-based dielectric composite ceramics comprises the following steps and contents:

[0031] (1) First, to analyze pure MgCl 2 ·6H 2 O, SrCl 2 ·6H 2 O, CaCl 2 、TiO 2 , AlCl 3 ·6H 2 O and LnCl 3 (Ln=Pr, Nd, La, Sm) as raw materials, analytically pure NaOH and KOH as precipitant and flux, respectively prepared MgTiO by molten salt method 3 , Ca 0.5 Sr 0.5 TiO 3 and LnAlO 3 (Ln=Pr, Nd, La, Sm) precursor powder. spare.

[0032] (2) Then, with the obtained MgTiO 3 Precursor powder as matrix, with Ca 0.5 Sr 0.5 TiO 3 or Ca 0.5 Sr 0.5 TiO 3 with LnAlO 3 The mixture of one of (Ln=Pr, Nd, La, Sm) is the additive, and each precursor powder is weighed according to the molar ratio of matrix and additive 1: (0.01~0.3), and mixed, ball milled, dried, ground, Granulating, sieving, dry pressing, and then sintering in a muffle furnace to obtain the MgTiO 3 Microwave-based dielec...

Example Embodiment

[0042] Embodiment 1: the high-performance MgTiO of the embodiment of the present invention 3 The preparation process of microwave-based dielectric composite ceramics is as follows:

[0043] (1) Weighing: First, weigh MgCl according to the molar ratio of 1:1:10:10 2 ·6H 2 O, TiO 2 , NaOH and KOH analytically pure reagent powder 20.33, 7.99, 40.01 and 56.11g respectively, standby; then, weigh SrCl according to the molar ratio of 0.5:0.5:1:8:8 2 ·6H 2 O, CaCl 2 、TiO 2 13.33, 5.55, 7.99, 32.01, and 44.89 g of analytically pure reagent powders of NaOH, KOH, and 44.89 g each, for later use.

[0044] (2) Primary ball milling: Put the two groups of reagents weighed into the ball milling tank of the stirring ball mill respectively, and add ZrO powder with 9 times the quality of the mixed powder. 2 Grinding balls and 5 times the mass of deionized water were ball milled and mixed for 24 hours.

[0045] (3) Primary drying: Dry the finely ground and mixed slurry in an atmospheric e...

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Abstract

The invention relates to MgTiO3-based microwave dielectric composite ceramic and a preparation method thereof and belongs to the field of high-tech functional ceramics and their application. The MgTiO3-based microwave dielectric composite ceramic is made by performing high temperature sintering and compounding on MgTiO3 as a base with one, as an additive, of Ca0.5Sr0.5TiO3 or mixture of Ca0.5Sr0.5TiO3 and LnAlO3 (Ln=Pr, Nd, La, Sm). The MgTiO3-based microwave dielectric composite ceramic is synthesized herein by a two-step process: MgTiO3, Ca0.5Sr0.5TiO3 and LnAlO3 (Ln=Pr, Nd, La, Sm) precursor powder are prepared separately through the molten-salt growth method, and the base is mixed with the additive before ball milling, drying, grinding, granulating, screening, dry shaping, and high temperature sintering to obtain the MgTiO3-based microwave dielectric composite ceramic. The MgTiO3-based microwave dielectric composite ceramic prepared herein has high density, low porosity, high dielectric constant, high quality factor, low dielectric loss and nearly zero resonant frequency temperature coefficient, and is particularly suitable for high frequency application in microwave dielectricresonators, filters and GPS (global positioning system) antennas.

Description

technical field [0001] The present invention relates to a kind of MgTiO 3 The invention relates to microwave-based dielectric composite ceramics and a preparation method thereof, which belong to the field of high-tech functional ceramics and their applications. Background technique [0002] Microwave dielectric ceramics refer to ceramic materials that are used as a medium in microwave frequency circuits to complete the transmission, reflection, absorption, etc. of electromagnetic waves, thereby exerting the functions of dielectric isolation, waveguide, and resonance in microwave circuits. In order to meet the needs of high-performance microwave devices, dielectric materials must have three major characteristics: high dielectric constant (ε r ), high quality factor (Q f) and close to zero resonant frequency temperature coefficient (τ f ), because the higher ε r Contributes to the miniaturization of device size, high Q f can achieve low loss, close to zero τ f The device m...

Claims

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Application Information

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IPC IPC(8): C04B35/465C04B35/622C04B35/634H01B3/12
CPCH01B3/12C04B35/465C04B35/622C04B35/63416C04B2235/3222C04B2235/6562C04B2235/6567C04B2235/96
Inventor 彭志坚谢璐智符秀丽
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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