High-heat-stability copper cadmium titanate X8R ceramic material

A technology of high thermal stability and ceramic materials, applied in the field of copper cadmium titanate X8R ceramic materials, can solve the problems of not meeting market demand, low temperature stability, and difficulty in wide application, etc., and achieve high yield, good uniformity, Practical effect

Active Publication Date: 2017-09-29
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the next ten years, researchers conducted some research on it. Among them, in 2015, Zhao Nan et al. used the traditional solid-state method to prepare CdCTO ceramics with a higher dielectric constant. At 1kHz, its relative permittivity It is 24000, but the dielectric loss is as high as 0.072. At the same time, its temperature stability is low and cannot meet the market demand. It is difficult to be widely used in capacitors (such as: X8R, etc.), memory and other electronic markets with high dielectric constants. device

Method used

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Embodiment 1

[0024] 1. Preparation of ceramic powder

[0025] According to CdCu 3 Ti 4 o 12 The stoichiometric ratio of 3.1159g Cd(NO 3 ) 2 4H 2 O, 7.3212g Cu(NO 3 ) 2 ·3H 2 O was added to a mixed solvent of 10 mL of absolute ethanol and deionized water to prepare solution A, and 13.8 mL of Ti(C 4 h 9 O) 4 Add it to 53.2mL of absolute ethanol to prepare solution B; mix solution A and solution B, and add 2mL of glacial acetic acid, the concentration of butyl titanate in the resulting mixed solution is 0.5mol / L, and the volume fraction of glacial acetic acid is 2.5 %, the volume fraction of deionized water is 10%, heated at 45°C and stirred evenly to obtain a sol, and continued to stir until the sol turned into a gel. After the gel was aged for 12 hours, it was dried at 100°C for 48 hours. Obtain xerogel; after grinding the xerogel, calcined at 650°C for 10 hours to obtain CdCu 3 Ti 4 o 12 Ceramic powder.

[0026] 2. Preparation of ceramic blocks

[0027] To CdCu 3 Ti 4 o 12...

Embodiment 2

[0029] In this embodiment, according to CdCu 3 Ti 4 o 12 The stoichiometric ratio of 3.1159g Cd(NO 3 ) 2 4H 2 O, 7.3212gCu(NO 3 ) 2 ·3H 2 O was added to a mixed solvent of 10 mL of absolute ethanol and deionized water to prepare solution A, and 13.8 mL of Ti(C 4 h 9 O) 4 Add it to 51.2mL of absolute ethanol to prepare solution B; mix solution A and solution B, and add 4mL of glacial acetic acid, the concentration of butyl titanate in the resulting mixed solution is 0.5mol / L, and the volume fraction of glacial acetic acid is 5.0 %, the volume fraction of deionized water is 10%, and the other steps are the same as in Example 1 to obtain the high thermal stability copper cadmium titanate X8R ceramic material.

Embodiment 3

[0031] In this embodiment, according to CdCu 3 Ti 4 o 12 The stoichiometric ratio of 3.1159g Cd(NO 3 ) 2 4H 2 O, 7.3212gCu(NO 3 ) 2 ·3H 2 O was added to the mixed solvent of 10mL absolute ethanol and deionized water to prepare solution A, and 13.8mL Ti(C 4 h 9 O) 4 Add it to 47.2mL of absolute ethanol to prepare solution B; mix solution A and solution B, and add 8mL of glacial acetic acid, the concentration of butyl titanate in the resulting mixed solution is 0.5mol / L, and the volume fraction of glacial acetic acid is 10 %, the volume fraction of deionized water is 10%, and the other steps are the same as in Example 1 to obtain the high thermal stability copper cadmium titanate X8R ceramic material.

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Abstract

The invention discloses a high-heat-stability copper cadmium titanate X8R ceramic material. The ceramic material is characterized in that Cd(NO3)2 4H2O, Cu(NO3)2 3H2O and Ti(C4H9O)4 are used as raw materials; acetic acid glacial is used as a chelating agent; a sol-gel method is firstly used for preparing precursor powder; then, the precursor powder is sintered at lower temperature, so as to obtain CdCu3Ti4Ol2 ceramic powder which can be mixed at the molecule level and has high uniformity and activity; the CdCu3Ti4Ol2 ceramic powder is further sintered, so that the high-heat-stability copper cadmium titanate X8R ceramic material is obtained. The preparation method of the ceramic material is simple; the repeatability is good; the finished product rate is high; the reaction temperature is lower; the energy sources are saved; the dielectric property of the ceramic material is excellent; high temperature stability is realized; the static electricity volume change rate at 1kHz in a temperature range of -55 DEG C to 150 DEG C is in a range between -13.21 percent and 14.02 percent; the parameter requirements of an X8R ceramic capacitor are met; wide application prospects are realized.

Description

technical field [0001] The invention belongs to the technical field of electronic ceramic materials, and in particular relates to a copper cadmium titanate X8R ceramic material with high thermal stability. Background technique [0002] With the development of the electronic information age, ceramic capacitors and microwave dielectric components have been paid more attention by scholars because of their broad application prospects in dynamic random access memory (DRAM) and multilayer ceramic capacitors (MLCC). Oxide materials with high dielectric constants are required to gradually realize miniaturization, integration, and multi-function. At present, DRAM and MLCC mostly use Ba titanate series Ba with perovskite phase structure. x Sr 1-x TiO 3 and lead titanate-based PbZr x Ti 1-x o 3 High dielectric constant material, but its dielectric constant (>1000) is far from meeting the needs of the electronic market. At the same time, these two materials have some shortcomi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/626C04B35/624
Inventor 晁小练彭战辉杨祖培梁朋飞
Owner SHAANXI NORMAL UNIV
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