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Barium strontium titanate ceramic capacitor material and preparation method thereof

A technology of ceramic capacitors and barium strontium titanate, which is applied in the field of ceramic capacitor materials and its preparation, can solve the problems of coarse grains, reduced breakdown strength, and high equipment requirements

Inactive Publication Date: 2010-03-03
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This not only requires high equipment and is not conducive to reducing production costs, but also easily leads to coarse grains, which affects the dielectric properties of materials, especially the reduction of breakdown strength

Method used

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  • Barium strontium titanate ceramic capacitor material and preparation method thereof
  • Barium strontium titanate ceramic capacitor material and preparation method thereof
  • Barium strontium titanate ceramic capacitor material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) First select the analytically pure chemical reagent BaCO 3 , SrCO 3 And TiO 2 , Press Ba 0.4 Sr 0.6 TiO 3 Ingredients, ball milled for 24h, dried, calcined at 1150℃ for 4h to form Ba 0.4 Sr 0.6 TiO 3 powder.

[0030] (2) According to the components in Table 2, after fully mixing, melting at 1100°C for 1 hour, quickly pour the glass liquid into cold water for quenching to obtain glass fragments, then ball mill the glass fragments for 4 hours and pass through a 400 mesh sieve to obtain glass powder A.

[0031] Table 2 Composition of glass powder A

[0032]

[0033] (3) According to 98vol% Ba 0.4 Sr 0.6 TiO 3 +2vol% glass powder A with ethanol as the dispersant, using agate balls, ball milling for 24 hours, and drying in an oven at 90°C to obtain a powder.

[0034] (4) The powder prepared in step (3) was subjected to cold isostatic pressing at a pressing pressure of 200Mpa to form a sample with a diameter of 20mm and a thickness of 2mm, and sintered at 1150°C for 1h in an air ...

Embodiment 2

[0040] According to 95vol% Ba 0.4 Sr 0.6 TiO 3 +5vol% glass powder A ratio, the specific process route is the same as in Example 2. The microscopic morphology of the components described in this example is as image 3 As shown, by adding 5 vol% glass powder A, the grain size of the sample is further refined, and the average grain size is 2 μm. The dielectric properties are shown in Table 4.

[0041] Table 4 Dielectric properties of the components described in Example 2

[0042]

Embodiment 3

[0044] According to 90vol% Ba 0.4 Sr 0.6 TiO 3 +10vol% glass powder A, the specific process route is the same as in Example 2. The microscopic morphology of the components described in this example is as Figure 4 As shown, adding 10 vol% glass powder A, the average crystal grain size of the sample is 1.5 μm. The dielectric properties are shown in Table 5.

[0045] Table 5 Dielectric properties of the components described in Example 3

[0046]

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PUM

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Abstract

The invention relates to a barium strontium titanate ceramic capacitor material and a preparation method thereof. The material is characterized by comprising the following components: 80 to 98 volumepercent of BaxSr1-xTiO3 and 2 to 20 volume percent of BaO-SiO2-B2O3 glass, wherein the range of x is between 0.2 and 0.5; and the molar contents of the compositions in BaO-SiO2-B2O3 glass are: 48 to 49 percent of BaO, 20 to 21 percent of SiO2, 26 to 27 percent of B2O3, 1 to 2 percent of SrO, 1 to 2 percent of ZrO2, 0.5 to 1 percent of Al2O3, 0.1 to 0.4 percent of MgO and 0.1 to 0.3 percent of Bi2O3. The barium strontium titanate ceramic capacitor material and the preparation method thereof provided by the invention can reduce the sintering temperature of barium strontium titanate by 250 to 400DEG C and the holding time to 1 hour, refine crystal grains to 1 to 3 micrometre, maintain dielectric loss at 1*10<-3> and increase pulse breakdown field strength to 40kV / mm, thereby meeting the requirements of a ceramic capacitor.

Description

Technical field [0001] The invention relates to a ceramic capacitor material and a preparation method thereof, in particular to a ceramic capacitor material based on barium strontium titanate and a preparation method thereof, belonging to the field of functional ceramics. Background technique [0002] Ba x Sr 1-x TiO 3 (BST) ceramics have excellent ferroelectric, piezoelectric and insulating properties, and are widely used in small and large-capacity miniature capacitors, thermistors, ultra-large dynamic random access memory, tuning microwave devices, etc., and are the most widely used in the field of electronic ceramics. One of a wide range of materials. The Curie temperature and dielectric constant of BST can be adjusted by changing the Ba / Sr ratio to meet the corresponding requirements. BST with high Ba content has become a research hotspot for the majority of researchers due to its high dielectric constant and voltage control and temperature control tunability. However, ther...

Claims

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Application Information

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IPC IPC(8): C04B35/468C04B35/47C04B35/622H01G4/12
Inventor 杜军张庆猛王磊唐群罗君
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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