X9R ceramic capacitor dielectric material and preparation method thereof

A technology of ceramic capacitors and dielectric materials, applied in the field of ceramic materials, can solve the problems of inability to meet the capacitance change rate ≤±15%, expensive, environmentally harmful, etc., and achieve good industrialization prospects, good temperature stability, and low cost. Effect

Active Publication Date: 2011-09-28
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the X9R patent (authorized announcement number CN100494118C) applied by Tianjin University has a room temperature dielectric constant of 1300-1400, but because it uses PbO as a raw material, it is harmful to the environment; two X9R patents applied by Wuhan University of Technology (authorized announcement number CN100591642C, published No. 101560094A) using BaTiO 3 -BiScO 3 main component, Sc 2 o 3 It is not conducive to reducing production costs because it is expensive
In addition, since the temperature range of X9R is defined from -55 to 175°C in these two patents, the material system involved cannot meet the standard of capacitance change rate ≤±15% at 200°C

Method used

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  • X9R ceramic capacitor dielectric material and preparation method thereof
  • X9R ceramic capacitor dielectric material and preparation method thereof
  • X9R ceramic capacitor dielectric material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1, preparation (1-x) BaTiO 3 -xBi 0.5 Na 0.5 TiO 3 (x=0.04, 0.08, 0.12) barium titanate-sodium bismuth titanate complex

[0030] 1) Preparation of (1-x) BaTiO 3 -xBi 0.5 Na 0.5 TiO 3 (x=0.04, 0.08, 0.12) the barium titanate-sodium bismuth titanate composite and characterize its dielectric-temperature properties:

[0031] Chemically pure Bi 2 o 3 、Na 2 CO 3 and TiO 2 Mix according to the molar ratio of 1:1:4, ball mill with ethanol as the medium for 24 hours, dry in a drying oven at 65°C for 12 hours, pass through a 120-mesh sieve, place in a crucible, and pre-fire at 900°C for 2 hours , to obtain pure sodium bismuth titanate powder;

[0032] 2) Mix the barium titanate with an average grain size of 300nm and the obtained sodium bismuth titanate powder according to the molar ratios of 4:96, 8:92 and 12:88 respectively, ball mill with deionized water for 48 hours, pour out, and place in After drying in an oven at 105°C for 8 hours, pre-fired at 110...

Embodiment 2

[0035] Prepared with 0.9BaTiO 3 -0.1Bi 0.5 Na 0.5 TiO 3 X9R ceramic capacitor dielectric material as the main component, and the influence of different contents of secondary dopants on its dielectric and electrical properties

[0036] Prepare 0.9BaTiO according to the same steps as in Example 1 3 -0.1Bi 0.5 Na 0.5 TiO 3 The barium titanate-sodium bismuth titanate composite powder shown is only replaced as follows: x=0.1. The obtained composite powder is mixed with a secondary dopant. The secondary dopant consists of Nb 2 o 5 and CaZrO 3 Composition, where Nb 2 o 5 and CaZrO 3 with 0.9BaTiO 3 -0.1Bi 0.5 Na 0.5 TiO 3 The molar ratios are 1.5:2:96.5, 2:2:96, 2.5:2:95.5, 3:2:95, 2.5:1:96.5, 2:1:97; 0.9BaTiO 3 -0.1Bi 0.5 Na 0.5 TiO 3 with Nb 2 o 5 and CaZrO 3 Mix according to the above molar ratio, ball mill with deionized water for 16 hours, dry at 105°C for 8 hours, pass through a 120 mesh sieve, use 5% polyethanol aqueous solution (PVA) as an organic bind...

Embodiment 3

[0044] The purpose of this example is to prepare dielectric ceramics with different component ratios of barium titanate-bismuth sodium titanate composites and barium titanate-bismuth potassium titanate composites as the main components, and to test their dielectric and electrical properties

[0045] Carry out the main component (1-x) BaTiO of preparation X9R type ceramic capacitor dielectric material according to exactly the same step as embodiment 1 3 -xBi 0.5 Na 0.5 TiO 3 The shown barium titanate-sodium bismuth titanate composite is only replaced as follows, and the values ​​of x are respectively 0.06, 0.08 and 0.12, which are listed in Table 3: CaZrO used in Example 2 3 Replace with SrZrO as shown in Table 3 3 , to obtain samples 7-11, where Nb 2 o 5 and SrZrO 3 with (1-x)BaTiO 3 -xBi 0.5 Na 0.5 TiO 3 The molar ratios are 2:2:96; the (1-x)BaTiO 3 -xBi 0.5 Na 0.5 TiO 3 with Nb 2 o 5 and SrZrO 3 Mix according to the above molar ratio, ball mill with deionize...

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Abstract

The invention discloses an X9R ceramic capacitor dielectric material and a preparation method thereof. The material comprises 95 to 98 molar percent of barium titanate-sodium bismuth titanate complex or barium titanate-potassium bismuth titanate complex serving as a main component, and 2 to 5 molar percent of secondary additive consisting of at least one of Nb2O5, CaZrO3 and SrZrO3. According to the preparation method of the invention, the dielectric ceramic material with high property can be obtained, meeting the electronic industries association (EIA) X9R standard; the process is simple, and intermediate temperature sintering can be performed; and the material has the room temperature dielectric constant of 1,500 to 1,700, the room temperature loss of about 2 percent, the room temperature resistivity of more than or equal to 1,013omega.cm, the breakdown voltage of more than or equal to 5kV/mm, and a good industrial prospect.

Description

technical field [0001] The invention relates to the technical field of ceramic materials applied to electronic components, and relates to an X9R type ceramic capacitor dielectric material and a preparation method thereof. Background technique [0002] Multilayer Ceramic Capacitors (Multilayer Ceramic Capacitors) are referred to as MLCC, which alternately stack ceramic bodies and internal electrodes and co-fire them into a whole. As a chip component, MLCC has many advantages such as small size, high insulation resistance, low parasitic inductance, and good high-frequency characteristics. It is suitable for surface mount technology, which can greatly increase the circuit assembly density and reduce the overall volume. The outstanding features make MLCC the most widely used and fastest growing electronic component in the world. [0003] According to the EIA (Electronic Industries Association) standard, the X9R type MLCC refers to the capacitance change rate (ΔC / C 25 )≤±15%. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/622
Inventor 王晓慧姚国峰钟财富李龙土桂治轮
Owner TSINGHUA UNIV
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