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Method for manufacturing ceramic material with low dielectric loss, large capacitivity and varistor characteristics

A technology of ceramic material and manufacturing method, which is applied to the manufacturing field of oxide ceramics, can solve problems such as reducing the permittivity, and achieve the effects of reducing dielectric loss, high repeatability, and simple preparation process

Active Publication Date: 2014-07-30
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the preparation process of copper perovskite ceramics reported in the literature, dry pressing is mainly used, although copper perovskite ceramics have a large permittivity (3000-10 5 ), but the dielectric loss of copper calcium titanium oxide ceramics is usually as high as 0.3 to 0.6 (Jo, Soo Kyong, Han, Young Ho. Sintering behavior and dielectric properties of polycrystalline CaCu 3 Ti 4 o 12 .J Mater Sci: Mater Electron (2009) 20:680-686; Ni Weiqing, Yu Jianchang, Zheng Xinghua, Liang Bingliang. Effect of firing process on CaCu 3 Ti 4 o 12 Influence of ceramic dielectric properties [J], Electronic Components and Materials, 2006, 10(10): 26-29); Li Jie et al. in Chinese patent 200710009111.9, using cold isostatic pressing forming process to oxidize copper calcium titanium The dielectric loss of material ceramics drops to 0.026 at room temperature at 1kHz, but the permittivity drops to about 3000; Zheng Qian et al., in Chinese patent CN102173781A, prepared copper calcium titanium oxide ceramic sheets by casting method, and adopted two steps sintering process, although the dielectric loss of copper calcium titanium oxide ceramics is D≈0.03, but the permittivity is reduced to ε r ≈10 4

Method used

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  • Method for manufacturing ceramic material with low dielectric loss, large capacitivity and varistor characteristics
  • Method for manufacturing ceramic material with low dielectric loss, large capacitivity and varistor characteristics

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Embodiment 1

[0025] Copper perovskite ceramics (CaCu 3+x Ti 4 o 12 ), wherein the trace amount of copper element exceeds the ceramic material whose stoichiometric ratio x=0.002. First, the main raw material with a purity of 99.0% is weighed according to the stoichiometric ratio of copper oxide: calcium carbonate: titanium dioxide = (3+0.002): 1: 4, and the mass ratio of the total mass of the main raw material mixed is 0.005% of the carbon dioxide Manganese is used as a trace additive, put into a nylon ball mill tank, use distilled water as the ball mill medium, use a planetary ball mill to mill at 300r / min for 4h, and then put the dried powder in a muffle furnace with a heating rate of 3°C / min Raise from room temperature to 930°C for pre-burning and keep warm for 2 hours; after pre-burning, ball mill, pass through 80-mesh sieve, and dry to obtain pre-fired powder; the defoamer used is ELEMENTIS SPECIALTIES ) of Defom W-086, according to the ratio of calcined powder: 5% polyvinyl alcohol...

Embodiment 2

[0027] Copper perovskite oxide ceramics were prepared by solid phase method. First, the main raw material with a purity of 99.0% is weighed according to the stoichiometric ratio of copper oxide: calcium carbonate: titanium dioxide = (3+0.002): 1: 4, and the mass ratio of the total mass of the main raw material mixed is 0.005% zinc oxide As a trace additive, put it into a nylon ball mill jar, use distilled water as the ball milling medium, and use a planetary ball mill to mill at 300r / min for 4h, then put the dried powder in a muffle furnace, and heat up at a rate of 3°C / min from The room temperature was raised to 930°C for pre-burning and kept for 2 hours; after pre-burning, ball milling was carried out, passed through an 80-mesh sieve, and dried to obtain pre-fired powder; the defoamer used was ELEMENTIS SPECIALTIES Defom W-086, according to the ratio of calcined powder: 5% polyvinyl alcohol solution: glycerol: antifoaming agent = 45:40:10:5, was added into the ball mill jar ...

Embodiment 3

[0029] Copper perovskite ceramics (CaCu3+x Ti 4 o 12 ), wherein the trace copper element exceeds the ceramic material whose stoichiometric ratio x=0.004. First, the main raw material with a purity of 99.0% is weighed according to the stoichiometric ratio of copper oxide: calcium carbonate: titanium dioxide=(3+0.004): 1:4, and the mass ratio of the total mass of the main raw material mixed is 0.005% of the carbon dioxide Manganese is used as a trace additive, put into a nylon ball mill tank, use distilled water as the ball mill medium, use a planetary ball mill to mill at 300r / min for 4h, and then put the dried powder in a muffle furnace with a heating rate of 3°C / min Raise from room temperature to 930°C for pre-burning and keep warm for 2 hours; after pre-burning, ball mill, pass through 80-mesh sieve, and dry to obtain pre-fired powder; the defoamer used is ELEMENTIS SPECIALTIES ) of Defom W-086, according to the ratio of calcined powder: 5% polyvinyl alcohol solution: glyc...

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Abstract

The invention discloses a method for manufacturing a ceramic material with low dielectric loss, high permittivity and voltage-sensitive characteristic, and relates to a method for manufacturing oxide ceramic. The method comprises the following steps: 1) taking copper oxide, calcium carbonate and titanium dioxide as raw materials, weighing according to the stoichiometric ratio of (3+x):1:4, wherein x is 0.001-0.01; then adding an additive, carrying out ball-milling in distilled water medium to obtain mixed powder; 2) baking and sieving the mixed powder obtained in the step 1) and then pre-sintering; 3) carrying out ball-milling on the mixed powder pre-sintered in the step 2), sieving and drying to obtain the pre-sintered powder; 4) mixing the pre-sintered powder, a polyvinyl alcohol solution, glycerinum and a defoamer, carrying out ball-milling after so as to obtain floating slurry; 5) fabricating floating slurry pieces; 6) carrying out glue discharging treatment on the floating slurry pieces prepared in the step 5), sintering and cooling, so as to obtain the ceramic material with low dielectric loss, high permittivity and voltage-sensitive characteristic.

Description

technical field [0001] The invention relates to a method for manufacturing oxide ceramics, in particular to a method for manufacturing ceramic materials with low dielectric loss, large permittivity and pressure-sensitive characteristics. Background technique [0002] With the rapid development of the electronic information industry, integration, miniaturization and high density have become the main trends in the development of electronic components. Copper perovskite oxide ceramics is a kind of giant permittivity material discovered in recent years. It does not undergo structural phase transition in the range of 100-600K, and has good temperature stability and frequency stability. In addition, when the applied electric field strength exceeds a certain value, copper calcium titanium oxide ceramics exhibit significant I-V nonlinear characteristics (S Y Chung, I D Kim and S J Kang, Strong nonlinear current-voltage behavior in perovskite derivative calcium copper titanate[J] .N...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/45C04B35/46C04B35/622
Inventor 熊兆贤李伟薛昊
Owner XIAMEN UNIV
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