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Low temperature sintering high-dielectric constant microwave-medium ceramics material and preparation method thereof

A technology of microwave dielectric ceramics and high dielectric constant, applied in the field of low-temperature sintered high-permittivity microwave dielectric ceramic materials and its preparation, low-temperature sintered O3 series high-permittivity microwave dielectric ceramic materials and their preparation fields, can solve Q× F value reduction and other issues, to achieve good reproducibility, facilitate mass production and application promotion, and reduce the effect of preparation costs

Active Publication Date: 2011-10-05
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the introduction of a large amount of glass additives, its Q×f value is greatly reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The raw materials calcium carbonate, neodymium trioxide, titanium dioxide and tin dioxide are pressed (Ca 0.61 Nd 0.26 )(Ti 1-y sn y )O 3 (0≤y≤0.1) chemical formula proportioning, mixing the prepared raw materials for 20 hours by wet grinding method (solvent is deionized water), and pre-calcining for 3 hours at 1125 °C in the atmosphere after drying, to synthesize (Ca 0.61 Nd 0.26 )(Ti 1-y sn y )O 3 .

[0016] The above synthesized (Ca 0.61 Nd 0.26 )(Ti 1-y sn y )O 3 , sintering aid H 3 BO 3 , CuO (wherein H 3 BO 3 to CuO in a weight ratio of 10:1) and Li 2 CO 3 Press [(Ca 0.61 Nd 0.26 )(Ti 1-y sn y )O 3 +5% (H 3 BO 3 -CuO)+0.5%Li 2 CO 3 ] The ceramic material is composed of ingredients, mixed for 12 hours by wet grinding method (the solvent is ethanol), taken out and dried to obtain the ceramic material.

[0017] The ceramic material prepared above is added into granules of polyvinyl alcohol aqueous solution with a weight percentage of 6% an...

Embodiment 2

[0022] The raw materials calcium carbonate, neodymium trioxide, titanium dioxide and tin dioxide are pressed (Ca 0.61 Nd 0.26 )(Ti 0.98 sn 0.02 )O 3 The ingredients are formulated according to the chemical formula, and the prepared raw materials are mixed for 12 hours by wet grinding method (the solvent is deionized water), and after drying, they are pre-fired for 4 hours at 1050 ° C in the atmosphere to synthesize (Ca 0.61 Nd 0.26 )(Ti 0.98 sn 0.02 )O 3 .

[0023] The above synthesized (Ca 0.61 Nd 0.26 )(Ti 0.98 sn 0.02 )O 3 , sintering aid H 3 BO 3 and CuO (where H 3 BO 3 The weight ratio with CuO is 10:1) according to [(Ca 0.61 Nd 0.26 )(Ti 0.98 sn 0.02 )O 3 +a(H 3 BO 3 -CuO)] (2% ≤ a ≤ 14%) porcelain materials are used as ingredients, wet grinding method (solvent is ethanol) and mixed for 18 hours, taken out and dried to obtain porcelain materials.

[0024] The ceramic material prepared above was added into granules of polyvinyl alcohol aqueous solu...

Embodiment 3

[0028] The raw materials calcium carbonate, neodymium trioxide, titanium dioxide and tin dioxide are pressed (Ca 0.61 Nd 0.26 )(Ti 0.98 sn 0.02 )O 3 The ingredients are formulated according to the chemical formula, and the prepared raw materials are mixed for 16 hours by wet grinding method (the solvent is deionized water), and after drying, they are pre-fired for 4 hours at 1100 ° C in the atmosphere to synthesize (Ca 0.61 Nd 0.26 )(Ti 0.98 sn 0.02 )O 3 .

[0029] The above synthesized (Ca 0.61 Nd 0.26 )(Ti 0.98 sn 0.02 )O 3 , sintering aid H 3 BO 3 , CuO (wherein H 3 BO 3 to CuO in a weight ratio of 10:1) and Li 2 CO 3 Press [(Ca 0.61 Nd 0.26 )(Ti 0.98 sn 0.02 )O 3 +5% (H 3 BO 3 -CuO)+bLi 2 CO 3 ] (0.5% ≤ b ≤ 2%) of the ceramic material composition ingredients, wet grinding method (solvent is ethanol) mixed for 16 hours, taken out and dried to obtain the ceramic material.

[0030] The ceramic material prepared above was added into granules of poly...

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Abstract

The invention discloses a low temperature sintered high dielectric constant microwave dielectric ceramic material. The component of the microwave dielectric ceramic material is [(1-x)(Ca0.61Nd0.26)(Ti1-ySny)O3+x(Li1 / 2 Nd1 / 2)TiO3]+a(H3BO3-CuO)+b Li2CO3, wherein x is more than or equal to zero and less than or equal to 0.7, y is more than or equal to zero and less than or equal to 0.1, a is more than zero and less than or equal to 15 percent, b is more than or equal to zero or less than or equal to 5 percent, and a and b represent, respectively, the weight percent of H3BO3-CuO and weigh percent of Li2CO3 against the weight of [(1-x)(Ca0.61Nd0.26)(Ti1-ySny)O3+x(Li1 / 2 Nd 1 / 2)TiO3]. The invention also discloses a method for preparing the ceramic material. By adding a small amount of low melting point sintering assistant, the method reduces the sintering temperature to between 850 and 1,100 DEG C and maintains excellent microwave dielectric property and, therefore, meets the requirement for cofiring with low cost Ag electrodes. The method can be used to manufacture multilayer dielectric resonators, microwave antennae, filters and other microwave elements and greatly reduce the manufacture costs of the microwave elements.

Description

technical field [0001] The invention relates to a low-temperature sintered high-permittivity microwave dielectric ceramic material and a preparation method thereof, especially a low-temperature sintered (Ca 0.61 Nd 0.26 )(Ti,Sn)O 3 The invention relates to a high dielectric constant microwave dielectric ceramic material and a preparation method thereof, belonging to the field of electronic ceramics and its manufacture. Background technique [0002] Low temperature co-fired ceramics (Low Temperature Co-fired Ceramics, LTCC) technology is a component integration technology that has emerged in recent years, and has become the first choice for miniaturization, integration, modularization and low cost of various microwave devices in circuits. It is widely used in military and civilian communication fields. Microwave dielectric ceramics are the key materials of LTCC technology. Among them, high dielectric constant microwave dielectric ceramics are mainly used in resonators and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/462C04B35/622
Inventor 张启龙杨辉孙慧萍
Owner ZHEJIANG UNIV
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