Giant dielectric composite ceramic copper calcium titanate material and preparation method and application thereof
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A technology of copper calcium titanate and composite ceramics, which is applied in the direction of circuits, capacitors, electrical components, etc., can solve the problems of less research and further improvement, and achieve the effects of good repeatability, simple and controllable preparation process, and high yield
Active Publication Date: 2019-04-19
XI AN JIAOTONG UNIV
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In addition, there are very few studies on the dielectric energy storage behavior of CCTO ceramic materials. The patents applied by Yao Xiaolian and others involve copper cadmium titanate, an oxide similar to copper calcium titanate (Yao Xiaolian, Peng Zhanhui, Yang Zupei, Liang Pengfei. A A high breakdown field strength and energy storage density silicon dioxide doped copper cadmium titanate giant dielectric ceramic material and its preparation method: China, CN107188559A[P].2017.07.20), the invention provides a high breakdown field Strong and energy storage density silicon dioxide doped copper cadmium titanate giant dielectric ceramic material and preparation method, the breakdown field strength of the ceramic material is as high as 895-2352V / cm, and the energy storage density is as high as 0.712-1.77mJ / cm 3 , but the energy storage behavior needs to be further improved from the practical application
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Embodiment 1
[0051] A preparation method of a giant dielectric copper calcium titanate composite ceramic material with high energy storage density is carried out according to the following steps:
[0052] (1) Preparation of copper calcium titanate micron powder (M)
[0053] a. Press CaCu 3 Ti 4 o 12 The stoichiometric ratio of the substances were weighed CaCO 3 7.6g, CuO 18.125g and TiO 2 24.275g;
[0054] b, the CaCO weighed in step a 3 , CuO and TiO 2 After mixing the raw materials, put them into a ball mill jar, then add 60mL of absolute ethanol and agate balls as a ball milling medium, place them in a planetary ball mill for ball milling, and mill at a speed of 500r / min for 12 hours;
[0055] c. Put the mixed solution after ball milling on an evaporating dish, place it in a drying oven, and dry it at 80°C for 10 hours to obtain the CCTO precursor powder;
[0056] d. Fully grind the dried CCTO precursor powder and pass through an 80-mesh sieve, then put it into an alumina cruci...
Embodiment 2
[0070] The difference from Example 1 is that in this example, in step (3), the ratio (N:M) of CCTO nanopowder to CCTO micropowder is 0.5:0.5 and weighs 10g of nanometer and 10g of micron powder After mixing, put it into a ball mill jar, then add 30mL of absolute ethanol and agate balls as a ball milling medium, place it in a planetary ball mill, and mill it at a speed of 550r / min for 12h.
[0071] Other steps are the same as in Example 1 to obtain a CCTO composite ceramic sample.
Embodiment 3
[0073] The difference from Example 1 is that in this example, in step (3), the ratio (N:M) of CCTO nanopowder to micron powder is 0.7:0.3, and 14g of nanometer and 6g of micron powder are weighed and mixed. Put it into a ball mill jar, add 30 mL of absolute ethanol and agate balls as a ball milling medium, place it in a planetary ball mill, and mill it at a speed of 550 r / min for 12 hours.
[0074] Other steps are the same as in Example 1 to obtain a CCTO composite ceramic sample.
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Abstract
The invention discloses a giant dielectric composite ceramic copper calcium titanate material and a preparation method and application thereof and belongs to the technical field of electronic ceramicmaterial preparation. According to the method, micro powder and nano powder which are synthesized by a solid-phase method and a sol-gel method are mixed for preparing the composite ceramic copper calcium titanate material, and the preparation process is simple, controllable and high in repeatability and yield. Moreover, by changing the composite ratio of the micro and nano powder, the crystal grain size and range of the composite ceramic copper calcium titanate material can be regulated and controlled, and therefore, the compact composite ceramic copper calcium titanate material with a high dielectric constant (5*104), low loss (0.051), high breakdown field strength (2,374V/cm) and high energy storage density (20kJ/m<3>) is obtained, wherein the energy storage density of the composite ceramic material is 12.7 times higher than that of ceramics prepared from micro powder and 12.1 times higher than that of ceramics prepared from nano powder. The composite ceramic copper calcium titanatematerial prepared by the method has high practicability, can be used as a dielectric material for preparing high-dielectric multilayer ceramic capacitors and dynamic random access memories, and can also serve as a pressure-sensitive ceramic material in the fields of electric power, electronic systems and the like.
Description
technical field [0001] The invention belongs to the technical field of preparation of electronic ceramic materials, and relates to a giant dielectric copper calcium titanate composite ceramic material and a preparation method and application thereof. Background technique [0002] With the increasingly prominent world energy and environmental problems, countries all over the world have attached great importance to the development and application of new energy. Dielectric energy storage technology has broad application prospects in the field of energy storage due to its characteristics of fast dielectric response, device miniaturization, intelligence, integration, and low cost, and has become an indispensable part of the development of new energy storage technology. part. The core of dielectric energy storage technology lies in the research and preparation of dielectric energy storage materials, and the development of an environmentally friendly, comprehensive performance, an...
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