Ceramic-polymer composite microwave material as well as preparation method and application methods thereof

A technology of microwave materials and application methods, which is applied in the field of ceramic-polymer composite microwave materials and their preparation and application, can solve the problems of low dielectric constant and high dielectric constant, achieve low microwave loss, and be easy to produce in large quantities Effect

Active Publication Date: 2013-11-13
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of low dielectric constant and high loss of existing ceramic-polymer composite microwave materials, with high dielectric constant ceramic material as the dispersed phase, low loss high-density polyethylene (HDPE) and Polystyrene (PS) is used as the matrix material, and it is prepared by the surface modification of ceramic particles, polymer wrapping, and blending and extrusion process, which has a high dielectric constant (3-13) and low microwave loss (less than one thousandth). Ceramic-polymer composite microwave dielectric materials for applications such as microstrip antennas and microwave substrates

Method used

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  • Ceramic-polymer composite microwave material as well as preparation method and application methods thereof
  • Ceramic-polymer composite microwave material as well as preparation method and application methods thereof
  • Ceramic-polymer composite microwave material as well as preparation method and application methods thereof

Examples

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Effect test

Embodiment 1

[0025] Using K90 ceramic powder (Ba-Nd-Ti system, dielectric constant 88, BNT for short), after sintering at a temperature of 1280 ℃, planetary ball milling for 30 minutes, drying out, and passing through a 120 mesh sieve. Add n-butyl titanate, which accounts for 2% of the mass of the K90 powder, after grinding and mixing, aging in a sealed bag for 24 hours for later use.

[0026] The commercial polystyrene (PS) is ultrasonically cleaned with alcohol and dried. Weigh PS and stale BNT powder according to the weight ratio of 25:205. Put the weighed PS into 150ml xylene solvent, stir and dissolve at 80℃, then add the BNT powder weighed in proportion, heat up to 120℃, continue stirring, until the xylene solvent is distilled and recovered. The powder obtained is crushed and passed through a 60-mesh sieve twice. The obtained powder: the volume content of PS is 40%, and the volume content of BNT is 60%.

[0027] The commercial powdered high-density polyethylene (HDPE) is ultrasonically...

Embodiment 2

[0031] Using K90 type powder (Ba-Nd-Ti system, dielectric constant 88, BNT for short), after sintering at a temperature of 1280 ℃, planetary ball milling for 30 minutes, drying out, and passing through a 120 mesh sieve. Add n-butyl titanate, which accounts for 2% of the mass of the K90 powder, after grinding and mixing, aging in a sealed bag for 24 hours for later use.

[0032] The commercial low-density polyethylene (LDPE) is ultrasonically cleaned with alcohol and dried. Weigh the LDPE and stale BNT powder at a weight ratio of 1.5:100. Put the weighed LDPE into the xylene solvent, stir and dissolve at 80°C, then add the weighed BNT powder, raise the temperature to 120°C, and continue stirring until the xylene solvent is distilled and recovered. The powder obtained is crushed and passed through a 60-mesh sieve twice.

[0033] The commercial powdered high-density polyethylene (HDPE) is ultrasonically cleaned with alcohol and dried. Mix with the BNT powder prepared in the previou...

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Abstract

The invention belongs to the field of manufacturing of microwave dielectric materials, and in particular relates to a ceramic-polymer composite microwave material as well as a preparation method and an application method thereof. The composite microwave material consists of a ceramic phase and a polymer phase, wherein the polymer phase is used as a matrix material, and the microwave dielectric ceramic phase is used as a filling material which is wrapped by a wrapping material for microwave dielectric ceramics to form a microwave dielectric ceramic phase and then is filled into the polymer phase to obtain the ceramic-polymer composite microwave material; the volume content of the microwave dielectric ceramic phase is 0-50%, and the volume content of the polymer phase is 50-100%. The preparation method of the composite material comprises the following steps: firstly, performing surface modification on ceramic powder by using an organic substance or coupling agent, then wrapping the ceramic powder by using a small amount of polymer, and finally, processing by adopting an extrusion molding process. Under the condition that the microwave frequency is about 10GHz, the dielectric constant of the composite material is 3-13 and the dielectric loss is 0.0003-0.001, so that the ceramic-polymer composite microwave material can be applied to microwave devices such as micro-strip antenna, microwave substrates and the like.

Description

Technical field [0001] The invention belongs to the field of microwave dielectric material manufacturing, and particularly relates to a ceramic-polymer composite microwave material and a preparation and application method thereof. Background technique [0002] In recent years, with the rapid development of technologies such as mobile communications, wireless broadband networks, and satellite navigation, civilian use has become the main application field of microwave technology instead of military use. Miniaturization, high performance, and low cost have become the main trends in the development of microwave products. [0003] The miniaturization of microwave devices requires microwave dielectric materials with high dielectric constant, while high performance requires microwave dielectric materials with low dielectric loss (that is, high quality factor) to ensure signal integrity and sensitivity of microwave devices. It is generally desired that the material loss is less than one th...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08L23/12C08L25/06C08K9/10C08K9/06C08K9/04C08K3/22
Inventor 张力岳振星李龙土
Owner TSINGHUA UNIV
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