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Calcium strontium lithium samarium titanium system microwave dielectric ceramic water-base tape-casting slurry and method for preparing ceramic diaphragm

A technology of microwave dielectric ceramics, calcium strontium lithium samarium titanium, applied in the field of preparation of calcium strontium lithium samarium titanium series microwave dielectric ceramic diaphragms, can solve the problem of not being able to obtain satisfactory diaphragm strength and lamination performance, and unable to realize the preparation of ceramic diaphragms , Have not seen problems such as ceramic diaphragms, to achieve the effect of avoiding dry cracking, excellent microwave dielectric properties, and excellent comprehensive properties

Inactive Publication Date: 2012-10-03
JINGDEZHEN CERAMIC INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ceramic diaphragm is prepared with calcium strontium lithium samarium titanium system material and water-based tape casting process. Due to its complex composition and the addition of sintering aids, the preparation of ceramic diaphragms cannot be achieved using the existing organic additive formula system
For example, using polyvinyl alcohol (PVA), which is more mature in the existing technology, as a binder, will react with sintering aids to form a gel, while using other systems of binders, such as latex systems, carboxylic acid monomers, etc. , acrylamide monomer, etc., and other organic additives, when casting the calcium strontium lithium samarium titanium series microwave dielectric ceramic powder containing sintering aids, it is easy to dry and crack and it is difficult to form a film, and satisfactory film strength cannot be obtained. and stack performance
At present, there are not many researches on calcium strontium lithium samarium titanium series ceramic materials in the prior art, so it has not been practically applied, and there have been no reports on the preparation of ceramic diaphragms by water-based tape casting process for this system material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The preparation method of the calcium strontium lithium samarium titanium series microwave dielectric ceramic diaphragm in this embodiment is as follows:

[0026] (1) 2g dispersant triethanolamine is dissolved in 70g deionized water, then add 100g containing 5.5wt% BCL sintering aid (by mass ratio B 2 o 3 :CuO:LiCO 3 =8.485:1.515:1) (Ca 0.9375 Sr 0.0625 ) 0.3 (Li 1 / 2 SM 1 / 2 ) 0.7 TiO 3Ceramic powder, after ball milling and mixing for 12 hours, add polyvinylpyrrolidone by volume: styrene-acrylic latex=1:1 composite binder 35g, plasticizer glycerol 5g, continue ball milling for 10 hours; then in the slurry Add 1.5 g of film-forming aid tributyl phosphate and 0.8 g of defoamer n-butanol, and stir on a magnetic stirrer for 3 hours to obtain casting slurry;

[0027] (2) Carry out tape casting molding on the tape casting machine after vacuum defoaming the tape casting slurry;

[0028] (3) Dry the flow-cast membrane at 30° C. for 1 hour, then at 60° C. for 1 hour, an...

Embodiment 2

[0031] The preparation method of the calcium strontium lithium samarium titanium series microwave dielectric ceramic diaphragm in this embodiment is as follows:

[0032] (1) 1.5g dispersant triethanolamine is dissolved in 55g deionized water, then add 95g containing 5.0wt% BCL sintering aid (by mass ratio B 2 o 3 :CuO:LiCO 3 =8.485:1.515:1) (Ca 0.9375 Sr 0.0625 ) 0.3 (Li 1 / 2 SM 1 / 2 ) 0.7 TiO 3 Ceramic powder, after ball milling and mixing for 10 hours, add polyvinylpyrrolidone by volume: composite binder 38g of styrene-acrylic latex=1: 1.5, plasticizer dibutyl phthalate 4g, continue ball milling for 8 hours; Add 1.8 g of film-forming aid tributyl phosphate and 0.8 g of defoamer n-butanol in the slurry, and stir on a magnetic stirrer for 3 hours to obtain casting slurry;

[0033] (2) Carry out tape casting molding on the tape casting machine after vacuum defoaming the tape casting slurry;

[0034] (3) Dry the flow-cast membrane at a temperature of 30°C for 3 hours, an...

Embodiment 3

[0037] The preparation method of the calcium strontium lithium samarium titanium series microwave dielectric ceramic diaphragm in this embodiment is as follows:

[0038] (1) 2.5g dispersant triethanolamine is dissolved in 60g deionized water, then add 98g containing 8.0wt%BBCL sintering aid (by mass ratio B 2 o 3 :CuO:LiCO 3 : Bi 2 o 3 =8.485:1.515:1:0.22) (Ca 0.9375 Sr 0.0625 ) 0.2 (Li 1 / 2 SM 1 / 2 ) 0.8 TiO 3 Ceramic powder, after ball milling and mixing for 11 hours, add polyvinylpyrrolidone by volume: styrene-acrylic latex=1.5:1 composite binder 40g, plasticizer glycerol 4.5g, continue ball milling for 10 hours; Add film-forming aid tributyl phosphate 1.2g, defoamer n-butanol 0.8g, be placed on magnetic stirrer and stir for 3 hours, obtain casting slurry;

[0039] (2) Carry out tape casting molding on the tape casting machine after vacuum defoaming the tape casting slurry;

[0040] (3) Dry the flow-cast membrane at 30° C. for 1 hour, then at 50° C. for 1 hour, an...

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Abstract

The invention discloses calcium strontium lithium samarium titanium system microwave dielectric ceramic water-base tape-casting slurry, which consists of ceramic powder, an organic additive and water, wherein the ceramic powder is calcium strontium lithium samarium titanium microwave dielectric ceramic solid-phase powder containing 3 to 12 weight percent of sintering aid; a composite bonding agent in the organic additive is prepared by compounding polyvinylpyrrolidone and a phenylpropyl emulsion in a volume ratio of (1-1.5):(1.5-1). In addition, the invention also discloses a method for preparing a ceramic diaphragm from the slurry by using a water-base tape-casting forming process. By the method, the preparation of the calcium strontium lithium samarium titanium system microwave dielectric ceramic diaphragm is realized, so that the problem of the actual application of the ceramic material of the system is solved, and the prepared ceramic diaphragm is high in strength and lamination performance, high in microwave dielectric property and low in sintering temperature, and can be sintered with silver and copper electrodes. The preparation method is simple and easy and low in production cost and is suitable for large-scale production, and the environment-friend requirement can be met.

Description

technical field [0001] The invention relates to the technical field of functional ceramic materials, in particular to the preparation technology of calcium strontium lithium samarium titanium series microwave dielectric ceramic diaphragm. Background technique [0002] With the rapid development of modern mobile communication, GPS, and wireless broadband Internet technology, higher requirements are put forward for microwave circuit components, and various miniaturized, composite, high-frequency, chip, and modular new microwave components are prepared. Dielectric components have become the development direction of microwave dielectric ceramics. At present, LTCC (low-temperature co-fired ceramic, low-temperature co-fired ceramics) technology has become the best technology for electronic components chip, integration and modularization due to its excellent electrical, mechanical, thermal and process characteristics. By using multilayer ceramic lamination technology, the relevant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/622
Inventor 李月明汪启轩王竹梅洪燕沈宗洋金云海
Owner JINGDEZHEN CERAMIC INSTITUTE
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