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Microwave dielectric ceramics and polytetrafluoroethylene-ceramic composite substrate, and preparation methods thereof

A technology of microwave dielectric ceramics and polytetrafluoroethylene, which is applied in the fields of ceramic materials and their preparation, polytetrafluoroethylene-based composite dielectric materials and their substrates, and can solve problems such as difficult industrial production and large temperature coefficient values , achieve low dielectric loss, improve the effect, and simplify the preparation process

Active Publication Date: 2018-03-02
UNIV OF ELECTRONIC SCI & TECH OF CHINA +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the PTFE-ceramic composite material prepared by the method provided by this technology has a higher dielectric constant (20-30) and a lower loss (1.5×10 -3 ), but its dielectric constant temperature coefficient value is very large (≈160ppm / ℃), and the patent uses ultrasonic stirring technology for mixing, which is not easy to realize in industrial production

Method used

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  • Microwave dielectric ceramics and polytetrafluoroethylene-ceramic composite substrate, and preparation methods thereof

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preparation example Construction

[0037] The preparation method of described ceramic material comprises the following steps:

[0038] (1) Ingredients: According to the general chemical formula Na 0.5-x-y Li x K y SM 0.5-m-n Nd m Bi n TiO 3 , the raw material is selected from Na 2 CO 3 , Li 2 CO 3 、K 2 CO 3 、Sm 2 o 3 、Nd 2 o 3 、 Bi 2 o 3 、TiO 2 , each raw material is determined according to the general chemical formula and the respective mass percentages are accurately weighed;

[0039] (2) Ball milling: the mixture obtained in step (1) is used as the ball milling medium with zirconia balls, and the mass ratio of mixture: balls: absolute ethanol is 1: (3 ~ 5): (1 ~ 2) Ball milling to obtain a uniformly mixed ball mill;

[0040] (3) drying: drying the ball abrasive obtained in step (2) after cleaning to obtain dry ceramics;

[0041] (4) calcining: placing the dried ceramics obtained in step (3) in an alumina crucible to calcinate the ceramic material;

[0042] (5) Ball milling and sieving t...

Embodiment 1

[0067] (1) The sodium carbonate of 15.22g, lithium carbonate of 20.59g, 38.29g samarium trioxide, 93.79g of neodymium trioxide, 15.74g of bismuth trioxide and 134.91g of titanium dioxide are carried out at 25 ℃ for 10 hours Ball milling and mixing to obtain a mixture;

[0068] (2) The obtained mixture was dried at 120°C for 8 hours, and the dried mixture was calcined at 1250°C for 4 hours to obtain the target ceramic;

[0069] (3) the ceramic particles obtained after the ball milling of the gained ceramics at 25° C. for 8 hours were sieved with a standard sampling sieve of 140 objects to obtain ceramic powder;

[0070] (4) Weigh 200g of ceramic powder, dry the ceramic powder in an oven at 120°C for 10h to remove physically adsorbed water, and prepare 150ml of a mixture of hydrogen peroxide and concentrated brine in a three-necked reflux flask (hydrogen peroxide: concentrated brine = 30: 70), and then add the ceramic powder to the mixed solution, boil at 60°C and stir for 1.5h t...

Embodiment 2

[0075] (1) The sodium carbonate of 13.46g, lithium carbonate of 21.90g, 32.48g samarium trioxide, the neodymium trioxide of 99.73g, the bismuth trioxide of 15.78g and the titanium dioxide of 135.25g are carried out at 25 ℃ for 10 hours Ball milling and mixing to obtain a mixture;

[0076] (2) The obtained mixture was dried at 120°C for 8 hours, and the dried mixture was calcined at 1250°C for 4 hours to obtain the target ceramic;

[0077] (3) the ceramic particles obtained after the ball milling of the gained ceramics at 25° C. for 8 hours were sieved with a standard sampling sieve of 140 objects to obtain ceramic powder;

[0078] (4) Weigh 200g of ceramic powder, dry the ceramic powder in an oven at 120°C for 10h to remove physically adsorbed water, and prepare 150ml of a mixture of hydrogen peroxide and concentrated brine in a three-necked reflux flask (hydrogen peroxide: concentrated brine = 30: 70), and then add the ceramic powder to the mixed solution, boil at 60°C and s...

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Abstract

The invention discloses microwave dielectric ceramics and a polytetrafluoroethylene-ceramic composite substrate, and preparation methods thereof, and belongs to the field of organic / inorganic composite materials. A microwave dielectric ceramic material is represented by the general formula: Na[0.5-x-y]Li[x]K[y]Sm[0.5-m-n]Nd[m]Bi[n]TiO[3], wherein 0.3<=x<=0.5, 0<=y<=0.05, 0.3<=m<=0.5, and 0<=n<=0.05. The microwave dielectric ceramics have the advantages of high dielectric constant, low dielectric loss, adjustable dielectric constant and temperature coefficient and the like.

Description

technical field [0001] The invention relates to a ceramic material and a preparation method thereof, and also relates to a preparation method of the polytetrafluoroethylene-based composite dielectric material reinforced by the ceramic and a substrate thereof, belonging to the field of organic / inorganic composite materials. Background technique [0002] With the rapid development of communication technology, the market needs microwave equipment with the characteristics of high operating frequency, wide operating frequency band, high speed and high stability. Microwave composite dielectric substrate material refers to a substrate material composed of organic resin, inorganic ceramics, glass fiber, etc., and has excellent dielectric properties at microwave frequencies, good dimensional stability and thermal stability, and can be used for 5G communications Network, vehicle radar, intelligent control, big data direct transmission and other fields. These fields require devices wi...

Claims

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Application Information

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IPC IPC(8): C04B35/462C04B35/50C04B26/08
CPCC04B26/08C04B35/462C04B35/50C04B2235/3298C04B2235/442C04B2235/96C04B14/42C04B18/023
Inventor 袁颖蒋泽华唐斌方梓烜张树人
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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