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A kind of low dielectric porous mullite wave-transparent material and preparation method thereof

A technology of porous mullite and wave-transmitting materials, which is applied in the preparation of porous mullite wave-transmitting materials, mullite porous ceramic wave-transmitting materials and its preparation, and can solve the problem of large pore size and uneven distribution of pore diameters in porous ceramics. , Poor foam stability and other problems, to achieve the effect of high moisture resistance, stable foam and high stability

Active Publication Date: 2021-05-25
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The foaming method can be applied in the preparation of porous mullite due to the advantages of simple process and easy preparation of high-porosity porous ceramics (Chinese Publication No. CN104446623A), but the porous ceramics prepared due to its poor foam stability The pore size is large and the pore diameter distribution is uneven, which greatly affects its mechanical properties

Method used

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  • A kind of low dielectric porous mullite wave-transparent material and preparation method thereof
  • A kind of low dielectric porous mullite wave-transparent material and preparation method thereof
  • A kind of low dielectric porous mullite wave-transparent material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] (1) Preparation of ceramic slurry: with median particle size D 50 =450nm alumina powder and median particle size D 50 =3μm silicon oxide powder as raw material, ultrapure water as solvent, isobutylene-maleic anhydride copolymer as dispersant, the amount of dispersant added is 0.16wt. Ceramic slurry with a solid content of 55 vol.%;

[0043] (2) Hydrophobically modified dispersant: add 0.28wt.‰ (relative to the mass of the powder) dodecyltrimethylammonium chloride to the slurry, and continue ball milling for 30 minutes to foam;

[0044] (3) Mechanical stirring and foaming: the above-mentioned ceramic slurry is mechanically stirred, and the agitator rotating speed is 800 rev / min, and the mechanical stirring is foamed for 6 minutes;

[0045] (4) Foam slurry solidification and drying: inject the above-mentioned foam slurry into a self-made mold, solidify at room temperature for 12 hours, and demold and dry for 48 hours;

[0046] (5) Sintering: the foamed china is kept at...

Embodiment 2

[0048] The preparation process is similar to that of Example 1, except that 0.33 wt.‰ (relative to the mass of the powder) dodecyltrimethylammonium chloride is added to the slurry. The obtained mullite porous ceramics, such as figure 2 As shown in (a) and (b), the average pore diameter in the obtained mullite porous ceramics was 21 μm.

Embodiment 3

[0050] The preparation process is similar to that of Example 1, except that 0.33 wt.‰ (relative to the mass of the powder) dodecyltrimethylammonium chloride is added to the slurry. The mechanical stirring speed was 1000 rpm, and the stirring was performed for 6 minutes. The average pore diameter of the obtained mullite porous ceramics was 25 μm.

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Abstract

The invention relates to a low-dielectric porous mullite wave-transmitting material and a preparation method thereof. The porous mullite wave-transmitting material has a closed-pore structure, and its porosity is 30-70%, preferably 30-51%.

Description

technical field [0001] The invention relates to a mullite porous ceramic wave-transmitting material and a preparation technology thereof, in particular to a particle-stabilized foam by utilizing the partial hydrophobic modification of the particles by surfactant molecules, thereby preparing a foam with fine, uniform pore size and closed-cell structure. A preparation method of porous mullite wave-transmitting material belongs to the technical field of functional ceramics. Background technique [0002] Due to its special use environment, the radome needs to have the characteristics of high temperature resistance, thermal shock resistance, erosion resistance, corrosion resistance, low dielectric constant and dielectric loss, and moisture resistance. At present, ceramic materials used in radomes have more or less certain disadvantages. Among them, the most mature quartz ceramics and their composite materials (China Publication No. CN103724037B) have excellent thermal shock resi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/185C04B35/632C04B35/626C04B35/622C04B38/10
CPCC04B35/185C04B35/622C04B35/6261C04B35/62625C04B35/632C04B38/10C04B2235/5436C04B2235/5445C04B2235/96C04B38/0054C04B38/0061
Inventor 周国红任剑涛王士维赵瑾薛振海
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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