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High porosity porous ceramic microsphere and preparation method thereof

A technology of porous ceramics and high porosity, applied in the field of materials, can solve the problems that it is difficult to meet the requirements of performance, efficiency, economy and environmental protection at the same time, it is difficult to prepare millimeter-scale ceramic microspheres, and the price of organic templates is expensive, so as to achieve low cost , Conducive to industrial production, good reproducibility

Active Publication Date: 2018-06-19
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main problem of this method is that not only the price of the organic template is expensive, which is unfavorable for cost control, but also it is difficult to prepare millimeter-scale ceramic microspheres with larger sizes.
[0006] In summary, although most of the existing preparation methods can produce ceramic microspheres that meet different needs, it is difficult to meet the requirements of performance, efficiency, and economic and environmental protection at the same time.

Method used

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  • High porosity porous ceramic microsphere and preparation method thereof
  • High porosity porous ceramic microsphere and preparation method thereof

Examples

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Embodiment 1

[0033] A method for preparing porous alumina ceramic microspheres with high porosity in this embodiment, the method comprises the following steps:

[0034] (1) Weigh alumina (Al 2 o 3 ) Ceramic powder, carbon powder and oleic acid, the three are mixed uniformly, and the mixture is obtained through a 100-mesh sieve after ball milling;

[0035] (2) Mix the mixture prepared in step (1) with paraffin wax at a ratio of 100:15, and then stir evenly at a temperature of 120° C. to obtain a wax slurry;

[0036] (3) Continue heating the wax slurry prepared in step (2) to 130° C., and then drop the wax slurry dropwise into water at 40° C. using a No. 6 syringe needle to solidify into balls to obtain solidified microspheres;

[0037] (4) Embed the solidified microspheres prepared in step (3) into alumina powder, place them in a muffle furnace at room temperature, and heat up to 900°C at a heating rate of 1°C / min to remove wax and keep warm Cool to room temperature after 30 minutes to o...

Embodiment 2

[0041] A method for preparing porous zirconia ceramic microspheres with high porosity in this embodiment, the method includes the following steps:

[0042] (1) Weigh zirconia (ZrO 2 ) ceramic powder and acetylene black, the two are mixed uniformly, and after ball milling, cross a 100-mesh sieve to obtain the mixture;

[0043] (2) Mix the mixture prepared in step (1) with paraffin wax in a ratio of 100:10, and then stir evenly at a temperature of 120° C. to obtain a wax slurry;

[0044] (3) Continue heating the wax slurry prepared in step (2) to 155° C., and then drop the wax slurry into water at 25° C. to solidify into balls using a No. 6 syringe needle to obtain solidified microspheres;

[0045] (4) Embed the solidified microspheres prepared in step (3) into zirconia powder, place them in a muffle furnace at room temperature, heat up to 1150°C at a heating rate of 1°C / min to remove wax, and keep warm for 30min After cooling to room temperature, bisque fired zirconia ceramic...

Embodiment 3

[0049] A kind of preparation method of high porosity porous magnesia ceramic microsphere of the present embodiment, described method comprises the following steps:

[0050] (1) Weigh magnesium oxide (MgO) ceramic powder, starch and oleic acid respectively according to the weight ratio of 75:25:1, mix the three evenly, and pass through a 100-mesh sieve after ball milling to obtain the mixture;

[0051] (2) Mix the mixture prepared in step (1) with paraffin wax in a ratio of 100:40, and then stir evenly at a temperature of 95° C. to obtain a wax slurry;

[0052] (3) Continue heating the wax slurry prepared in step (2) to 135°C, and then use a No. 5 syringe needle to drop the wax slurry into silicone oil at 35°C to solidify into balls to obtain solidified microspheres ;

[0053] (4) Embed the solidified microspheres prepared in step (3) into magnesium oxide powder, place in a muffle furnace at room temperature, heat up to 950°C at a heating rate of 1°C / min to remove wax, and kee...

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Abstract

Belonging to the technical field of materials, the invention relates to a high porosity porous ceramic microsphere and a preparation method thereof. The preparation method includes: mixing ceramic powder, a pore-forming agent and oleic acid in proportion, then conducting ball milling, then mixing the mixture with paraffin in proportion, then heating and stirring the substances evenly at 80-120DEGC to obtain a wax slurry, then heating the wax slurry to 120-155DEG C, dripping the wax slurry into a low temperature liquid medium with a syringe needle dropwise for solidifying into a microsphere, conducting high temperature dewaxing treatment on the solidified microsphere for 30-120min by burying sintering process, and finally calcining the biscuit firing ceramic microsphere under a high temperature condition to obtain the porous ceramic microsphere. The method provided by the invention has the advantages of simple process, low cost and good reproducibility, and the prepared inorganic porous ceramic microsphere has high porosity. Also, the method provided by the invention can avoid deterioration of water sensitive powder during microsphere formation, and is especially suitable for preparation of water sensitive inorganic ceramic microspheres.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to porous ceramic materials. More specifically, the invention relates to a high-porosity porous ceramic microsphere and a preparation method thereof. Background technique [0002] In recent years, millimeter-scale ceramic microspheres have been widely used in nuclear fuel elements, petroleum exploration, chemical catalysis, separation and purification, and other fields. As the fourth-generation nuclear fuel element, compared with the traditional cylindrical pellet element, the ceramic microsphere fuel element will be densified under the action of irradiation and temperature, which can effectively alleviate the swelling and deformation of the cylindrical pellet due to irradiation. Problem: In the field of oil exploitation, ceramic microspheres can be used as fracturing proppant in the fracturing operation of oil and gas wells, and enter the fractures with the fracturing fluid, open t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B35/48C04B35/10C04B35/04
CPCC04B35/04C04B35/10C04B35/48C04B38/0645C04B38/068
Inventor 邓义群梁彤祥甄卓武夏婷婷汪方木蒋鸿辉杨辉刘超杨懿
Owner JIANGXI UNIV OF SCI & TECH
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