High-porosity porous ceramic and preparation method thereof
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A technology of porous ceramics and high porosity, which is applied to ceramic products, other household utensils, household utensils, etc., and can solve the problems of separate preparation process and complexity, and achieve the effect of increasing pore content, simplifying manufacturing process, and easy operation
Inactive Publication Date: 2012-07-18
ANHUI UNIV OF SCI & TECH
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[0006] The present invention aims to solve the problems that the slurry foaming and foam solidification processes are separated from each other and the preparation process is complicated in the preparation of high-porosity porous ceramics by the existing direct foaming technology, and provides a high-porosity porous ceramic and its preparation method
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specific Embodiment approach 1
[0021] Embodiment 1: In this embodiment, a high-porosity porous ceramic has uniform spherical honeycomb pore structure units, the pore walls are connected to each other through porous windows, and the porosity P satisfies 90%
[0022] The beneficial effect of this embodiment is: the porosity of the high-porosity porous ceramics of this embodiment can reach more than 90%.
specific Embodiment approach 2
[0023] Specific embodiment two: a kind of preparation method of high porosity porous ceramics is carried out according to the following steps:
[0024] 1. Weigh 45% to 70% of submicron ceramic powder, 0.9% to 1.8% of binder, 0.5% to 0.9% of dispersant and 26.3% to 53.6% of solvent according to mass percentage, and ball mill after mixing. Obtain a uniformly dispersed slurry;
[0025] 2. Put the slurry obtained in step 1 in a vacuum chamber, and vacuum degassing for 10-20 minutes;
[0026] 3. Test the supercooling point of the slurry treated in step 2, and obtain the supercooling point as T 1 ;
[0027] 4. Cool down the slurry treated in step 2 to T 2 ,T 1 +1℃≤T 2 ≤ T 1 +2°C, supercooled ceramic slurry is obtained;
[0028] 5. Place the supercooled ceramic slurry obtained in step 4 in a closed container with a decompression device, and within 0.5 to 1 minute, reduce the pressure in the closed container to 400 to 10 Pa to obtain a solidified foam material;
[0029] 6. The...
specific Embodiment approach 3
[0032] Embodiment 3: The difference between this embodiment and Embodiment 2 is that the submicron ceramic powder in step 1 is oxide ceramics or non-oxide ceramics with a particle size of 0.1-0.9 μm. Others are the same as in the second embodiment.
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Abstract
The invention provides high-porosity porous ceramic and a preparation method thereof, relates to porous ceramic and a preparation method thereof, and aims to solve the problems that when the high-porosity porous ceramic is prepared by adopting the prior direct foaming technology, a slurry foaming process is separated from a foam solidification process, and the preparation process is complex. The high-porosity porous ceramic is provided with even spherical honeycomb pore structure units, wherein the pore walls are mutually communicated via porous windows; and the porosity can reach above 90 percent. The preparation method comprises the steps that: I, raw materials are weighed and ball-milled to obtain slurry; II, the slurry is placed in a vacuum chamber to be degassed; III, a supercooling point of the slurry is tested; IV, the slurry is cooled to obtain supercooling slurry; V, the supercooling slurry is decompressed, foamed and solidified with foam; VI, the solidified and foamed material is dried to obtain ceramic bisque; and VII, the ceramic bisque is sintered to obtain the high-porosity porous ceramic. The preparation method has the advantages that the slurry foaming process is organically combined with the foam solidification process, the technology is simple and the porosity of the prepared ceramic reaches above 90 percent. The preparation method is used for preparing the high-porosity porous ceramic.
Description
technical field [0001] The present invention relates to porous ceramics and its preparation method. Background technique [0002] Porous ceramics have the advantages of low density, large specific surface area, and low thermal conductivity, and are widely used in many fields such as the treatment of automobile exhaust and industrial wastewater, molten metal filtration, catalyst carriers, heat insulation materials, sound insulation materials, and biological materials. The preparation methods of porous ceramics are mainly divided into replica technology, sacrificial template method and direct foaming technology. Different processing methods determine the different microstructures and properties of porous ceramics. Therefore, which preparation route to use strongly depends on the structure of the final product, the cost and operability of the process. [0003] Compared with replica technology and sacrificial template method, direct foaming technology avoids the process of tem...
Claims
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