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Microwave dielectric ceramic, polytetrafluoroethylene-ceramic composite substrate and preparation method

A polytetrafluoroethylene-ceramic composite technology is applied in the fields of ceramic materials and their preparation, polytetrafluoroethylene-based composite dielectric materials and the preparation of their substrates, and can solve the problems of large temperature coefficient value and difficult industrial production realization, and the like. Achieving low dielectric loss, improving effect and good modification effect

Active Publication Date: 2020-12-04
UNIV OF ELECTRONICS SCI & TECH OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 lower loss (1.5×10) at 10 GHz -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 ceramic, polytetrafluoroethylene-ceramic composite substrate and preparation method

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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 its mass percentage content is accurately weighed;

[0039] (2) Ball milling: use the mixture obtained in step (1) as the ball milling medium with zirconia balls, and carry out according to the mass ratio of mixture: grinding ball: 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...

Embodiment 1

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

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

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

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

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) drying the obtained mixture at 120° C. for 8 hours, and calcining the dried mixture at 1250° C. for 4 hours to obtain the target ceramic;

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

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

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Abstract

A microwave dielectric ceramic, a polytetrafluoroethylene-ceramic composite substrate and a preparation method thereof belong to the field of organic / inorganic composite materials. The general formula of the microwave dielectric ceramic material of the present invention is: Na 0.5‑x‑ y Li x K y SM 0.5‑m‑n Nd m Bi n TiO 3 ; where, 0.3≤x≤0.5, 0≤y≤0.05, 0.3≤m≤0.5, 0≤n≤0.05. The invention has the advantages of high dielectric constant, low dielectric loss, adjustable temperature coefficient of dielectric constant 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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Patent Type & Authority Patents(China)
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 ELECTRONICS SCI & TECH OF CHINA
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