A method for preparing foamed ceramics with connected pore walls by using hollow microspheres

A foamed ceramic and connected cell technology, applied in the field of open-cell foamed ceramic materials, can solve the problems of poor air permeability, piezoresistance, and difficulty in obtaining a highly open-celled structure, and achieve the effect of uniform distribution of open cells

Active Publication Date: 2020-08-25
北京华圻生态科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, so far, most of the foamed ceramics prepared by the direct foaming method are mainly pore walls, and it is difficult to obtain a highly open-pored structure, which makes the foamed ceramics only used in heat preservation. , its air permeability must be very poor, even if it is breathable, it will face huge pressure resistance, and it cannot be applied in the fields of adsorption, catalysis, filtration, energy conversion, etc.

Method used

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  • A method for preparing foamed ceramics with connected pore walls by using hollow microspheres
  • A method for preparing foamed ceramics with connected pore walls by using hollow microspheres
  • A method for preparing foamed ceramics with connected pore walls by using hollow microspheres

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Embodiment 1

[0021] The method for preparing foamed ceramics with connected pore walls by using hollow microspheres comprises the following steps:

[0022] (1) Preparation of slurry containing 40wt% cerium oxide and 10wt% silicon oxide hollow microspheres, the average particle size of cerium oxide is 0.32 μm, and the particle size of silicon oxide hollow microspheres is mainly distributed in 15-60 μm, such as figure 1 and figure 2 As shown, its bulk density is 0.22g / cm 3 .

[0023] (2) Add 0.08wt% sodium lauryl sulfate to the prepared slurry, and then adjust the pH to 6.8.

[0024] (3) A mechanical stirrer was used to stir and foam at 2000rmp for 10 minutes to obtain a stable ceramic foam slurry. After drying, a dry body is obtained.

[0025] (4) The green body is heated to 1500°C at a heating rate of 3°C / min, and kept for 2 hours. prepared as image 3 The shown open-cell cerium oxide foam ceramics has a pore size distribution of 10-60 μm.

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Abstract

The invention discloses a method utilizing hollow micro-spheres to prepare foamed ceramic provided with communicated hole walls. The method comprises the following steps that ceramic powder and hollowmicro-spheres are used as raw materials to prepare water-based slurry with the total solid phase content of 20%-50% by weight. A surface active agent is added in the slurry to conduct hydrophobization modification on the ceramic powder. Slurry foaming is performed in a mechanical stirring mode to obtain ceramic grains and foam cooperatively stable with the hollow micro-spheres, and sintering is performed to obtain the foamed ceramic provided with communicated hole walls after foam drying. The hollow micro-spheres embedded into the hole walls play a hole formation effect through sintering treatment. Therefore, the prepared foam structure has a highly pored structure and can be applied to the fields such as adsorption, catalysis and filtration.

Description

technical field [0001] The invention belongs to the technical field of open-cell foam ceramic materials, and in particular relates to a method for preparing foam ceramics with connected pore walls by using hollow microspheres. Background technique [0002] Ceramic foam combines the advantages of porous materials and ceramic materials, and has properties such as high temperature resistance, high porosity, heat insulation, and chemical stability. It is widely used in fluid filtration, catalyst carriers, and artificial bones. The preparation methods of porous materials mainly include organic foam impregnation method, adding pore-forming agent method, direct foaming method, solid-state sintering method (also known as aggregate accumulation method), sol-gel method, freeze-drying method, etc. Compared with other methods, the slurry direct foaming method is easier to prepare high-porosity foamed ceramics, and the preparation process is relatively simple. The particle-stabilized fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/10C04B38/08C04B35/50C04B35/10C04B35/48C04B35/185
CPCC04B35/10C04B35/185C04B35/48C04B35/50C04B38/10C04B2235/3418C04B2235/36C04B38/085
Inventor 杨金龙霍文龙张笑妍任博王亚利席小庆
Owner 北京华圻生态科技有限公司
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