Low dielectric comsumption CaCu3Ti4O12 ceramic preparing method

A low-dielectric, ceramic technology, applied in the direction of circuits, electrical components, piezoelectric/electrostrictive/magnetostrictive devices, etc., can solve the problems of large dielectric loss, etc., achieve a small number of pores, low shrinkage, and improved The effect of dielectric properties

Inactive Publication Date: 2007-11-14
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the prepared CCTO materials generally have relatively large dielectric loss while having relatively high permittivity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Mix the raw materials calcium carbonate, titanium dioxide and copper oxide in a molar ratio of 1:4:3, wet ball mill in an agate ball mill jar, pass through a 80-mesh screen, and use distilled water as the ball milling medium. Raw materials by mass ratio: agate ball: distilled water=1 : 1: 1.2. The planetary ball mill was used for ball milling for 4 hours at a speed of 250 rpm, and the mixed powder after ball milling was dried in an oven. Then the mixed powder was pre-fired in an agate crucible at 950°C and kept for 2 hours. The pre-fired mixed powder is then ball milled and dried. Then add 10% by mass of PVA, grind and granulate in an agate mortar. The granulated powder was dry-pressed at 150 MPa, and then cold-isostatically pressed at 200 MPa to form a disc with a diameter of 9 mm and a thickness of 2 mm. The green body is sintered in an electric furnace at 1020°C and held for 2 hours, and then cooled with the furnace. The surface is polished, silver electrodes are...

Embodiment 2

[0018] Mix the raw materials calcium carbonate, titanium dioxide and copper oxide in a molar ratio of 1:4:3, wet ball mill in an agate ball mill jar, pass through a 100-mesh sieve, and use distilled water as the ball milling medium. Raw materials by mass ratio: agate ball: distilled water=1 : 1.1: 1.1. The planetary ball mill was used for ball milling for 4 hours at a speed of 250 rpm, and the mixed powder after ball milling was dried in an oven. Then the mixed powder was pre-fired in an agate crucible at 850°C and kept for 6 hours. The pre-fired mixed powder is then ball milled and dried. Then add 7% by mass of PVA, grind and granulate in an agate mortar. The granulated powder was dry-pressed at 200 MPa, and then cold-isostatically pressed at 150 MPa to form a disc with a diameter of 9 mm and a thickness of 2 mm. The green body was sintered in an electric furnace at 1050°C and held for 2 hours, and then cooled with the furnace. The surface is polished, silver electrodes a...

Embodiment 3

[0020] Mix the raw materials calcium carbonate, titanium dioxide and copper oxide in a molar ratio of 1:4:3, wet ball mill in an agate ball mill jar, pass through a 120-mesh sieve, and use distilled water as the ball milling medium. Raw materials by mass ratio: agate ball: distilled water=1 :0.9:0.9. The planetary ball mill was used for ball milling for 4 hours at a speed of 250 rpm, and the mixed powder after ball milling was dried in an oven. Then the mixed powder was pre-fired in an agate crucible at 900°C and kept for 1 h. The pre-fired mixed powder is then ball milled and dried. Then add 8% by mass of PVA, grind and granulate in an agate mortar. The granulated powder was dry-pressed at 100 MPa, and then cold-isostatically pressed at 250 MPa to form a disc with a diameter of 9 mm and a thickness of 2 mm. The green body was sintered in an electric furnace at 1100°C and held for 2 hours, and then cooled with the furnace. The surface is polished, silver electrodes are app...

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PUM

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Abstract

This invention relates to preparation method of a low electric loss CaCu3Ti4O12 ceramic.Firstly mix the raw material calcium carbonate, titanium dioxide and cupric oxide according to molar ratio of 1:4:3, wet method ball mill to gain mixture powder. Drythe mixture powder, then preburn at 850 to 1000deg. Ball mill the mixture powder after preburning, past at least 80 orders screen mesh, dry, add polyvinyl alcohol and grind, corning, dry pressing and moulding, then cold equal steady pressure for shaping, sintering the body, then furnace cool.

Description

technical field [0001] The present invention relates to a kind of CaCu 3 Ti 4 o 12 (hereinafter referred to as CCTO) ceramics, especially relate to a kind of adopting cold isostatic pressing method to prepare low dielectric loss CaCu 3 Ti 4 o 12 ceramics. Background technique [0002] Recently CaCu 3 Ti 4 o 12 The material has attracted much attention because of its unusually high permittivity near room temperature, about 10 4 ~10 5 , and has good thermal stability in the temperature range of 100 ~ 600K. When the temperature drops below 100K, ε drops sharply to about 100, but no long-range structural phase transition is observed (1, Subramanian M A, Li D, Duan N, et al. Highdielectric constant ACu3Ti4O12 and ACu3Ti3FeO12 phases[J].Solid State Chem , 2000, 15: 323-325; 2. Ramirez A P, Subramanian M A, Gardel M, et al. Giant dielectr constant response in acopper-titanate [J]. Solid State Commun, 2001, 15: 217-220; 3. Subramanian M A, Sleight A W. ACu3Ti4O12 and ACu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/622C04B35/634H01L41/187
Inventor 熊兆贤李洁薛昊
Owner XIAMEN UNIV
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