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High solid content lithium-niobium-titanium series microwave medium ceramic water-based casting green tape

A technology of microwave dielectric ceramics and dielectric ceramics, which is applied in the field of high solid content lithium niobium titanium series microwave dielectric ceramic water-based casting tapes, can solve the problem that the solid content of the powder cannot be increased, the fluidity of the slurry is destroyed, and the viscosity of the slurry can be increased. and other problems, to achieve the effect of improving surface finish, low cost and meeting environmental protection requirements

Inactive Publication Date: 2011-07-13
佛山市华南精细陶瓷技术研究开发中心 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because most of the binders used in water-based slurries are in the form of emulsions, there are few products on the market, which limits the choice of binders
At present, polyvinyl alcohol (PVA) is the water-based binder that has been studied more and has relatively mature technology. In the process of material configuration, PVA and commonly used sintering aid B 2 o 3 A gel reaction will occur, which increases the viscosity of the slurry, thereby destroying the original fluidity of the slurry; and the concentration of the PVA aqueous solution is low, resulting in too high a water content in the slurry formula to improve the solidity of the powder. content

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 0.8 g of ammonium polyacrylate to 15 g of water, and after stirring, add 62 g of lithium niobium titanium dielectric ceramic powder and 1 g of V 2 o 5 Powder, ball milled for 12 hours to make water-based slurry for later use. Add 15.8 grams of styrene-acrylic emulsion with a concentration of 48%, 5 grams of glycerin, 0.08 grams of defoamer and 0.32 grams of film-forming aids to the prepared water-based slurry step by step, and continue ball milling for 6 hours to obtain water base ceramic paste. The resulting slurry was filtered, vacuum stirred and defoamed, cast on a tape casting machine, and dried at 60° C. for 3 hours to obtain a microwave dielectric ceramic green tape. Cut the raw tape and put it into the sintering furnace, heat up to 450°C at a rate of 2°C / min for debinding, control the debinding time at 100mins, then heat up to 880°C at a rate of 6°C / min for sintering, and sinter for 100mins Finally, a microwave dielectric ceramic diaphragm with a dense str...

Embodiment 2

[0025] Add 0.9 g of ammonium polyacrylate to 14 g of water, and after stirring, add 65 g of lithium niobium titanium dielectric ceramic powder and 1.3 g of V 2 o 5 Powder, ball milled for 18 hours to make water-based slurry for later use. Add 14.5 grams of styrene-acrylic emulsion with a concentration of 48%, 4 grams of glycerin, 0.06 grams of defoamer and 0.24 grams of film-forming aids to the prepared water-based slurry step by step, and continue ball milling for 8 hours to obtain water base ceramic paste. The resulting slurry was filtered, vacuum stirred and defoamed, cast on a tape casting machine, and dried at 50° C. for 2.5 hours to obtain a microwave dielectric ceramic green tape. After cutting the raw tape, put it into the sintering furnace, raise the temperature to 435°C at a rate of 2°C / min for debinding, control the debinding time at 100mins, then raise the temperature to 900°C at a rate of 6°C / min for sintering, and sinter for 100mins Finally, a microwave dielectr...

Embodiment 3

[0027] 1 gram of ammonium polyacrylate was added to 13 grams of water, and after stirring, 68 grams of 2 TiO 3 solid solution) composite structure of Li 1.429 Nb 0.286 Ti 0.786 o 3 Dielectric ceramic powder (its raw material molar ratio is Li 2 O:Nb 2 o 5 :TiO 2 = 5:1:1.5) and 1.4 g V 2 o 5 Powder, ball milled for 20 hours to make water-based slurry for later use. Add 13.2 grams of styrene-acrylic emulsion with a concentration of 48%, 3.2 grams of glycerol, 0.04 grams of defoamer and 0.16 grams of film-forming aids to the prepared water-based slurry, and continue ball milling for 10 hours to obtain water base ceramic paste. The resulting slurry was filtered, vacuum stirred and defoamed, cast on a tape casting machine, and dried at 50° C. for 2 hours to obtain a microwave dielectric ceramic green tape. After cutting the raw tape, put it into the sintering furnace, raise the temperature to 435°C at a rate of 2°C / min for debinding, control the debinding time at 80mins...

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Abstract

The invention relates to a high solid content lithium-niobium-titanium series microwave medium ceramic water-based casting green tape, belonging to the preparation field of the microwave medium ceramic. In the preparation method of the green tape, lithium-niobium-titanium series low temperature sintered microwave medium ceramic is used as solid phase powder, water is used as solvent, styrene-acrylic emulsion is used as binder, and plasticizer, dispersant, defoaming agent, film-forming additive and the like are added to prepare ceramic slurry, and the casting and drying technology is performed to prepare the green tape. The prepared water-based microwave medium ceramic green tape has high solid content, smooth surface, good mechanical propertics, no pollution and low cost; electrode materials such as silver and copper can be printed on the surface of the green tape, binder is removed at 400-450 DEG C and the product is sintered at 860-950 DEG C to have excellent microwave dielectric properties. The green tape material is suitable to prepare multi-layer low temperature cofired ceramic (LTCC) electronic components such as chip dielectric resonators, filters, Baluns and antennas and has broad application prospect.

Description

technical field [0001] The invention relates to a high-solid-content lithium-niobium-titanium series microwave dielectric ceramic water-based cast tape, which belongs to the field of microwave dielectric ceramic preparation. technical background [0002] Li 2 O-Nb 2 o 5 -TiO 2 Microwave dielectric ceramics have excellent microwave dielectric properties, with a dielectric constant of 20 to 80, a high quality factor and a low temperature coefficient of resonance frequency. The raw material of this material is suitable for the design and manufacture of chip dielectric resonators, filters, Baluns, antennas, and multilayer low-temperature co-fired ceramic (LTCC) electronic components such as multilayer Bluetooth and GPS modules have broad application prospects. Borisevich, Davies, Shanghai Institute of Ceramics, Chinese Academy of Sciences [Patent 1, Publication No. CN 1915904A], [Patent 2, Publication No. CN 1821171A] and Xi’an Jiaotong University [Patent 3, Publication No. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C04B35/63C04B35/462C04B35/495
Inventor 王双喜王亚东周建民黄国权
Owner 佛山市华南精细陶瓷技术研究开发中心
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