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Low dielectric, wave-transparent porous ceramic material and preparation process thereof

A porous ceramic, low dielectric technology, applied in ceramic products, circuits, electrical components, etc., can solve the problems of unsatisfactory electrical properties of traditional ceramic materials, and achieve a scientific and reasonable preparation method, easy to implement, and excellent dielectric properties. Effect

Active Publication Date: 2006-06-28
SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] In the field of aerospace wave-transmitting materials, because spacecraft require materials that integrate heat protection, wave-transmitting, and load-bearing functions, ceramic materials are widely used for their excellent performance, but the electrical properties of traditional ceramic materials are not Ideally, the research on porous ceramics that can be applied to wave-transmitting materials has always been the focus of domestic and foreign scholars. Porous ceramic wave-transmitting materials with a dielectric constant less than 2 and good wave-transmitting performance are even more difficult in material research.

Method used

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  • Low dielectric, wave-transparent porous ceramic material and preparation process thereof

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Effect test

Embodiment 1

[0025] The preparation method of the low dielectric and wave-transparent porous ceramic material of the present invention is as follows:

[0026] Weigh 100 grams of quartz powder passed through a 1000 mesh sieve, with a silicon dioxide weight content of 99.99%, 90 grams of water-soluble solid aluminum phosphate powder produced by Xinxiang Fengfan Industrial Company, 9 grams of 0.45-5 micron silicon nitride powder, and α-phase nitrogen The weight content of SiO is 95%, and the ingredients are mixed with absolute ethanol by ball milling, and a foaming agent of 3% by weight of the ingredients is added for granulation, and the particle size is controlled to be 70-80 microns, wherein the foaming agent is an aqueous solution of silicon phosphate. The ratio of phosphorus to silicon is controlled to be 1:1, and the concentration is 50% by weight. The granulated particles are formed by cold isostatic pressing at a pressure of 100 MPa, and then fired at a high temperature of 930-980° C....

Embodiment 2

[0030] The preparation method of the low dielectric and wave-transparent porous ceramic material of the present invention is as follows:

[0031] Weigh 80 grams of quartz powder with a particle size of 2-10um, the weight content of silicon dioxide is 99.98%, 90 grams of aluminum phosphate powder, 12 grams of 0.5-3 micron silicon nitride powder, and the weight content of α-phase silicon nitride is 94%. , using absolute ethanol to mix the ingredients evenly by ball milling, adding a foaming agent with a weight of 5% of the ingredients to granulate, and the particle size is controlled to be 60 to 70 microns, wherein the foaming agent is an aqueous solution of silicon phosphate, and the ratio of phosphorus to silicon is controlled to be 1: 1. The concentration is 45% by weight. The granulated particles are formed by cold isostatic pressing at a pressure of 95MPa, and then fired at a high temperature of 900-960°C for 50 minutes to obtain the low-dielectric and wave-transparent poro...

Embodiment 3

[0033] The preparation method of the low dielectric and wave-transparent porous ceramic material of the present invention is as follows:

[0034] Weigh 110 grams of quartz powder with a particle size of 5-15um, the weight content of silicon dioxide is 99.99%, 85 grams of aluminum phosphate powder, 14 grams of 0.6-4 micron silicon nitride powder, and the weight content of α-phase silicon nitride is 93%. , using ball milling to mix the ingredients evenly with absolute ethanol, adding a foaming agent with a weight of 8% of the ingredients to granulate, and the particle size is controlled to be 70 to 80 microns, wherein the foaming agent is an aqueous solution of silicon phosphate, and the ratio of phosphorus to silicon is controlled to be 1: 1. The concentration is 55% by weight. The granulated particles are formed by cold isostatic pressing at a pressure of 120 MPa, and then fired at a high temperature of 1000-1060° C. for 40 minutes to obtain the low-dielectric and wave-transpa...

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Abstract

The invention relates to a improved low dielectric, wave-passable multi-hole ceramic material and the manufacturing method. The weight proportion of the raw material is that quartz: aluminum phosphate: silicon nitride= (40-55): (40-55): (5-10), and 1-10% abio-liquid foaming agent. Pressing into mold after graining, the diameter is controlled to 60-90mm. The invention would satisfy application request, and it is easy to operate.

Description

technical field [0001] The invention relates to an improved wave-transmitting material and a preparation method thereof, belonging to the technical field of special and functional ceramics. Background technique [0002] Porous ceramics, also known as porous functional ceramics, refer to new ceramic materials with a certain size and number of pore structures. Porous ceramics need to be fired at a high temperature, and a large number of interconnected or closed pores are formed in the material body during the forming and sintering process of the material. Porous ceramics have evenly distributed micropores (porosity can be as high as 50% to 90%), small bulk density, developed specific surface area and unique physical surface characteristics, and have selective permeability, energy absorption or Pressure resistance characteristics and excellent thermal, electrical, magnetic, optical, chemical and other functions. Because of its unique high temperature resistance, corrosion res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/14C04B35/447C04B35/622C04B38/02H10N30/853
Inventor 张伟儒李伶陈达谦雷加喜山玉波田柯
Owner SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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