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Dampproof method for porous ceramic material containing silicon hydroxyl

A porous ceramic and silanol-containing technology, which is applied in the field of porous ceramic materials, can solve problems such as unstable dielectric properties, easy moisture absorption, and increased dielectric loss tangent, achieving improved striking accuracy and large steric hindrance , The effect of improving the electrical properties of ceramics

Active Publication Date: 2015-02-18
湖北三江航天江北机械工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a moisture-proof method for porous ceramic materials containing silicon hydroxyl groups, which solves the problem that porous ceramic materials containing silicon hydroxyl groups are extremely easy to absorb moisture, and the dielectric loss tangent value of the material increases after moisture absorption , Unstable dielectric properties and moisture absorption rate of 8~15% under high temperature and high humidity conditions, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The moisture-proof process of porous high-silica fiber-reinforced composite ceramic materials is as follows:

[0024] 1) Soak the porous ceramics containing silanol in absolute ethanol for 30 minutes, and then bake the porous ceramics containing silanol at 120°C for 10 hours;

[0025] 2) Place the baked porous ceramics containing silicon hydroxyl groups in a box-type resistance furnace, rise from room temperature to 350°C within 150 minutes, keep warm for 150 minutes, then rise to 650°C within 70 minutes, keep warm for 20 minutes, and then cool with the furnace. The temperature is lowered to room temperature and taken out;

[0026] 3) Soak the silicon hydroxyl-containing porous ceramics treated in step 2) in silane compounds, seal and soak for 12 hours, and then pour off the upper layer solution, in which the silane compounds are composed of hexamethyldisilazane:n-hexyl Alkane = 1: 5 mixed;

[0027] 4) Repeat step 3) 3 times;

[0028] 5) Soak the silanol-containing p...

Embodiment 2

[0033] The moisture-proof process of porous high-silica fiber-reinforced composite ceramic materials is as follows:

[0034] 1) Soak the porous ceramics containing silanol in absolute ethanol for 40 minutes, and then bake the porous ceramics containing silanol at 120°C for 5 hours;

[0035] 2) Place the baked porous ceramics containing silicon hydroxyl groups in a box-type resistance furnace, rise from room temperature to 450°C within 170 minutes, keep warm for 280 minutes, then rise to 800°C within 100 minutes, keep warm for 100 minutes, and then cool with the furnace. The temperature is lowered to room temperature and taken out;

[0036] 3) Soak the silicon hydroxyl-containing porous ceramics treated in step 2) in silane compounds, seal and soak for 12 hours, and then pour off the upper layer solution, in which the silane compounds are composed of hexamethyldisilazane:n-hexyl Alkane=1:10 mixed;

[0037] 4) Repeat step 3) 2 times;

[0038] 5) Soak the silanol-containing po...

Embodiment 3

[0043] The moisture-proof process of porous high-silica fiber-reinforced composite ceramic materials is as follows:

[0044] 1) Soak the porous ceramics containing silanol in absolute ethanol for 30 minutes, and then bake the porous ceramics containing silanyl at 20°C for 24 hours;

[0045] 2) Put the baked porous ceramics containing silicon hydroxyl groups in a box-type resistance furnace, raise it from room temperature to 380°C within 160 minutes, keep it warm for 200 minutes, then rise it to 720°C within 70 minutes, keep it warm for 60 minutes, and then cool it with the furnace. The temperature is lowered to room temperature and taken out;

[0046] 3) Soak the silicon hydroxyl-containing porous ceramics treated in step 2) in silane compounds, seal and soak for 12 hours, and then pour off the upper layer solution, in which the silane compounds are composed of trichloromethylsilane:n-hexane= 1:8 mixed;

[0047] 4) Repeat step 3) once;

[0048] 5) Soak the silanol-containin...

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PUM

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Abstract

The invention discloses a damproof method for a porous ceramic material containing silicon hydroxyl. The method comprises the following steps of: firstly immersing porous ceramic containing silicon hydroxyl in absolute ethyl alcohol for 30-60 minutes; putting the baked porous ceramic containing silicon hydroxyl in a resistance furnace; heating the porous ceramic containing silicon hydroxyl to 350-450 DEG C from room temperature within 150-170 minutes, and then preserving heat for 150-280 minutes; then heating the porous ceramic containing silicon hydroxyl to 650-800 DEG C within 70-100 minutes, and then preserving heat for 20-100 minutes; cooling porous ceramic containing silicon hydroxyl in the furnace and taking the porous ceramic containing silicon hydroxyl out of the furnace when the temperature is reduced to room temperature; then immersing the porous ceramic containing silicon hydroxyl in a silane compound for 7-12 hours in a sealed manner and pouring out the solution at the upper layer; finally washing with absolute ethyl alcohol. The damproof method has the characteristics that the silicon hydroxyl-containing porous ceramic is immersed in a silane compound, and then hydrophilic silicon hydroxyl Si-OH on the surface of the porous ceramic is converted into hydrophobic Si-CH3, so that the porous ceramic has strong dampproof performance and low moisture absorption rate reduced to 0.1-0.9%.

Description

technical field [0001] The invention relates to the technical field of porous ceramic materials, in particular to a moisture-proof method for porous ceramics containing silicon hydroxyl groups. Background technique [0002] For porous ceramic materials containing silanol (such as high silica fiber reinforced composite ceramic materials, porous SiO 2 ∕SiO 2? For ceramic materials, quartz reinforced phosphate materials, etc.), the existence of pores in the material itself makes it easy to absorb moisture in the air. As a result of this phenomenon, the dielectric loss tangent of the material increases, and the microwave energy consumed increases. That is to say, it affects its wave-transmitting ability, and its water absorption rate is affected by the ambient humidity, which further leads to the instability of the dielectric properties of the substrate. The moisture absorption rate of porous ceramics without moisture-proof treatment is 8-15% under high-temperature and high-hu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/84
Inventor 雷宁佘平江尹正帅郭陪江陈海昆王芬
Owner 湖北三江航天江北机械工程有限公司