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A kind of preparation method of porous quartz ceramics

A technology of porous quartz and ceramics, applied in the field of preparation of porous quartz ceramics, which can solve the problems of high cost, complex composition of raw materials, and inability to prepare porous quartz ceramics, etc., and achieve the effects of reducing raw material costs, excellent performance, and low dielectric loss

Inactive Publication Date: 2018-12-18
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above preparation method, on the one hand, its raw materials also include glass powder and foam stabilizer, the composition of raw materials is complex, and the cost is high; on the other hand, porous quartz ceramics cannot be prepared according to the above method

Method used

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  • A kind of preparation method of porous quartz ceramics
  • A kind of preparation method of porous quartz ceramics
  • A kind of preparation method of porous quartz ceramics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The preparation method of the quartz hollow microsphere body of the present embodiment is:

[0045] (a) mixing high-purity quartz powder and water at a volume ratio of 1:3, adding a dispersant with a volume fraction of 0.5%, mixing and ball milling to obtain a quartz slurry with a solid phase volume fraction of 25%;

[0046] (b) adding propyl gallate with a volume fraction of 0.5% to the quartz slurry, and fully stirring to obtain a quartz foam slurry;

[0047] (c) adding the quartz foam slurry to a centrifugal atomization device, atomizing to form hollow slurry droplets, and spraying them into a molding chamber at 200° C., rapidly losing moisture and drying to obtain a quartz hollow microsphere body ( The average particle size is 5μm, and the bulk density is 0.30g / cm 3 ).

[0048] The preparation method of the present embodiment porous quartz ceramics, comprises the following steps:

[0049](1) Put the high-purity quartz hollow microsphere body into a mold coated wi...

Embodiment 2

[0053] The preparation method of the quartz hollow microsphere body of the present embodiment is:

[0054] (a) mixing high-purity quartz powder and water at a volume ratio of 3:2, adding a dispersant with a volume fraction of 1.0%, mixing and ball milling to obtain a quartz slurry with a solid phase volume fraction of 60%;

[0055] (b) adding propyl gallate with a volume fraction of 0.1% to the quartz slurry, and fully stirring to obtain a quartz foam slurry;

[0056] (c) adding the quartz foam slurry into a centrifugal atomization device, atomizing to form hollow slurry droplets, and spraying them into a molding chamber at 80° C., rapidly losing moisture and drying to obtain a quartz hollow microsphere body ( The average particle size is 200μm, and the bulk density is 0.80g / cm 3 ).

[0057] The preparation method of the present embodiment porous quartz ceramics, comprises the following steps:

[0058] (1) Put the high-purity quartz hollow microsphere body into a mold coate...

Embodiment 3

[0062] The preparation method of the quartz hollow microsphere body of the present embodiment is:

[0063] (a) mixing high-purity quartz powder and water at a volume ratio of 1:2, adding a dispersant with a volume fraction of 0.1%, mixing and ball milling to obtain a quartz slurry with a solid phase volume fraction of 33%;

[0064] (b) adding propyl gallate with a volume fraction of 0.2% to the quartz slurry, and fully stirring to obtain a quartz foam slurry;

[0065] (c) adding the quartz foam slurry to a centrifugal atomization device, atomizing to form hollow slurry droplets, and spraying into a molding chamber at 300° C., rapidly losing moisture and drying to obtain a hollow quartz bead body ( The average particle size is 200μm, and the bulk density is 0.40g / cm 3 ).

[0066] The preparation method of the present embodiment porous quartz ceramics, comprises the following steps:

[0067] (1) Put the high-purity quartz hollow microsphere body into a mold coated with a rele...

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Abstract

The invention relates to a preparation method of porous quartz ceramic. The preparation method of the porous quartz ceramic comprises the following steps: a quartz cenosphere green body is placed into a mold, and the mold is placed into a high-temperature sintering furnace for sintering and heated to 1,500-1,720 DEG C from 15-35 DEG C according to temperature programming steps in an inert gas at the pressure of 0.01-0.55 MPa; foaming is performed at 1,500-1,720 DEG C for 5-185 min; the temperature is reduced from 1,500-1,720 DEG C to 450-1,350 DEG C at the temperature reduction rate of 0.5-22 DEG C / min, then cooling with the high-temperature sintering furnace is performed until the temperature ranges from 15 DEG C to 35 DEG C, and a product is obtained. According to the preparation method, the porous quartz ceramic can be prepared from the quartz cenosphere green body which is taken as the only raw material through a self-foaming reaction in the inert gas, the cost of the raw material is reduced, the preparation method is simplified, and industrial production is facilitated; the porous quartz ceramic has excellent performance and the characteristics of light mass, high strength, low dielectric constant, low dielectric loss and the like.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, and in particular relates to a preparation method of porous quartz ceramics. Background technique [0002] Porous ceramics is a new type of inorganic non-metallic material with many pores. Its pore structure is evenly distributed, its specific surface area is high, its bulk density is small, and it has selective permeability, energy absorption or damping properties for liquid and gas media. Combined with the characteristics of high temperature resistance, corrosion resistance, chemical stability and dimensional stability of ceramic materials, they are widely used in molten metal filtration, catalyst carriers, advanced insulation materials, biological implant materials, sensor materials, radome materials and other fields . [0003] At present, the preparation methods of porous ceramics mainly include the following methods: adding pore-forming agent method, organic foam impregnation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/08C04B35/14
CPCC04B38/085C04B35/14C04B38/0087
Inventor 杨金龙张笑妍李娜渠亚男苏振国许杰席小庆马宁王亚利
Owner TSINGHUA UNIV
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