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Ceramic capacitor dielectric material

A technology of ceramic capacitors and ceramic dielectrics, applied in the direction of fixed capacitor dielectrics and components of fixed capacitors, etc., can solve the problems of high price, unfavorable enterprise development, and high cost of MLCC materials, and achieve excellent dielectric properties and material costs.

Inactive Publication Date: 2011-04-13
XIAMEN SUNYEAR ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high price of precious metal palladium, the cost of corresponding MLCC materials is relatively high, which is not conducive to the development of enterprises

Method used

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  • Ceramic capacitor dielectric material
  • Ceramic capacitor dielectric material
  • Ceramic capacitor dielectric material

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Experimental program
Comparison scheme
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preparation example Construction

[0011] 1. Preparation of glass flux: 5-10wt% Al 2 o 3 , 10-20 wt% SiO 2 , 15-25 wt% ZnO, 20-35 wt% CuO, 30-45 wt% V 2 o 5 Weigh each oxide separately, mix them in a ball mill, add deionized water according to the ratio of powder: water = 1: (1-1.5), and the ball milling time is 15-25 hours. After the ball milling is evenly mixed, dry, Pulverize, melt at 1150°C-1300°C for 1-3 hours, then pour into water to quench, and obtain the glass flux (glass powder) of the present invention after ultra-fine grinding, filtration and drying.

[0012] 2. According to the composition, the main component is barium zinc titanate of 85-92wt%, 1-4wt% of SrO, and 0.5-1.5wt% of Y 2 o 3 , 1~4 wt% Nb 2 o 5 , 0.1~0.4 wt% MnO 2 , 0.3~1.5 wt% of R 2 o 3 , R is at least one of La, Ce, Nd, Sm, 3~10wt% glass flux, weigh various materials, mix them in an ultrafine mill for ultrafine grinding, and the average particle size of the powder is required It is better to be smaller than 0.7 micron; then i...

Embodiment

[0014] (1) To analyze pure Al 2 o 3 , SiO 2 , ZnO, CuO, V 2 o 5 As the raw material, according to the composition ratio in Table 1, according to the glass powder preparation process described in 1 of the Summary of the Invention, the glass powder is obtained after the processes of ball milling, drying, melting, quenching, crushing, filtering, drying and the like.

[0015] (2) According to the composition in Table 2, the main material is analytically pure Ba synthesized by the oxalate method 1-x Zn x TiO 3 (0.01≤x≤0.06), add analytically pure SrO, Y 2 o 3 , Nb 2 o 5 , MnO 2 , R 2 o 3 (R is at least one of La, Ce, Nd, and Sm) and the glass powder described in (1), adding deionized water in a ball mill for ultra-fine pulverization, and drying to obtain the ceramic dielectric material of the present invention powder.

[0016] (3) The process of preparing capacitor samples: add PVA-based binder to the ceramic dielectric material described in (2) to granulate, apply a ...

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Abstract

The invention discloses a ceramic capacitor dielectric material, which is characterized by consisting of three parts in percentage by weight, namely 85 to 92 percent of zinc barium titanite serving as a principal component, 3 to 8 percent of modified dopant and 3 to 10 percent of glass flux. The dielectric material adopts zinc-doped barium titanate generated through an oxalate method as a main material, is a ceramic dielectric material sintered at lower temperature and meeting EIA (electronic industries association) X7R temperature characteristic, matches a palladium / silver alloy inner electrode with 20 / 80 and even lower palladium content to prepare a multi-layer ceramic capacitor, and guarantees that a capacitor component has excellent electrical property and the material cost can be obviously reduced.

Description

technical field [0001] The invention relates to a ceramic capacitor dielectric material. Background technique [0002] Multilayer ceramic capacitor (MLCC for short) is a kind of capacitor with ceramic as the medium. Because MLCC has the advantages of small size, high reliability and suitable for surface mounting, it has become a passive electronic capacitor used in various electronic circuits. element. The ceramic dielectric materials used in MLCC include a type of dielectric material based on barium titanate with X7R temperature characteristics in the EIA standard. This type of material matches the 30 / 70 palladium / silver alloy internal electrode and has excellent sintering at about 1100 ° C. MLCC electrical properties. For example, in medium and high voltage, low equivalent series resistance, radio frequency, microwave and other MLCC products, most of them use palladium / silver alloy as the internal electrode. Due to the high price of precious metal palladium, the cost of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468H01G4/12
Inventor 李太坤林康张军志邹海雄
Owner XIAMEN SUNYEAR ELECTRONICS CO LTD