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Multifunctional element possessing large electric capacitance and pressure-sensitive character and its preparation method

A capacitance and multi-function technology, which is applied in the manufacture of fixed capacitance parts, electrical components, capacitors, etc., can solve the problems of single function of electronic components, limit the miniaturization of electronic equipment, etc., and achieve a small number of pores and a low shrinkage rate , The effect of improving the dielectric properties

Inactive Publication Date: 2008-03-26
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional electronic components generally only have a single function, and the number of components usually required in electronic circuits is large, thus limiting the further development of the miniaturization of electronic equipment

Method used

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  • Multifunctional element possessing large electric capacitance and pressure-sensitive character and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The raw materials calcium carbonate, titanium dioxide and copper oxide are mixed in a molar ratio of 1:4:3, wet ball milled, and the ball milled powder is dried in an oven. Then pre-fire the powder in an agate crucible at 950°C for 3 hours and keep it warm for 2 hours. The calcined powder was dry-pressed at 150MPa, and cold isostatically pressed at 200MPa to form a disc with a diameter of 10mm and a thickness of 2mm. The green body is sintered in an electric furnace at 1020°C for 3 hours, held for 2 hours, and then cooled with the furnace. The shape of the ceramic body is modified, the surface is polished, the upper and lower surfaces are covered with Ag top electrodes and Ag bottom electrodes by screen printing, and heat treatment is carried out at 500 ° C to make the Ag top electrodes and Ag bottom electrodes combined with the CCTO ceramic medium densely. Its electrical performance test, the following results can be obtained. Performance 1: High capacitance characte...

Embodiment 2

[0026]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 sieve, 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. Pre-fire the mixed powder in an agate crucible at 950°C and keep it warm for 2h. After heat preservation, the mixed powder is 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 3

[0028] Similar to Example 2, the raw materials were mixed, ball milled, and passed through a 100-mesh sieve, according to the mass ratio of raw materials: agate balls: distilled water=1: 1.1: 1.1. Pre-fire the mixed powder in an agate crucible at 850°C and keep it warm for 6h. After heat preservation, the mixed powder is ball milled and dried. Then add 7% by mass of PVA. 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 is sintered in an electric furnace at 1050°C and held for 2 hours, then cooled with the furnace, the surface is polished, and silver electrodes are applied.

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Abstract

This invention provides a multifunction element with a large electric volume and voltage-sensitive character and its preparation method, which sets an Ag top electrode and an Ag bottom electrode on the up and down surfaces of a medium wafer of CCTO ceramic material, both of which are wafer electrodes, applies a solid reaction method to synthesize CCTO powder and applies a dry-pressing and cooling static-pressing technology and ceramic sintered technology to prepare CCTO ceramic medium wafer with the synthesized powder to modify its shape and surface of the wafer to be polished and then applies silk-screen printing to prepare Ag top electrode and an Ag bottom electrode on the top and bottom surfaces of the wafer.

Description

technical field [0001] The present invention relates to a kind of CaCu 3 Ti 4 o 12 Components based on ceramic materials with large capacitance and pressure-sensitive characteristics. Background technique [0002] Recently, CaCu 3 Ti 4 o 12 (hereinafter referred to as CCTO) material has attracted widespread attention, it has an 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 is lowered below 100K, ε drops sharply to around 100, but no long-range structural phase transition is observed (1, Subramanian M A, LiD, Duan N, et al. High dielectric constant ACu 3 Ti 4 o 12 and ACu 3 Ti 3 FeO 12 phases [J]. Solid State Chem, 2000, 15: 323-325; 2. Ramirez A P, Subramanian M A, Gardel M, et al. 217-220; 3. Subramanian M A, Sleight A W. ACu 3 Ti 4 o 12 and ACu 3 Ru 4 O perovskites: high dielectric constants and valence degeneration[J]. Sol State Sci, 20...

Claims

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Application Information

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IPC IPC(8): H01G4/12H01G4/005H01G13/00H01C7/115H01C17/00C04B35/622
Inventor 熊兆贤薛昊李洁
Owner XIAMEN UNIV
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