Method for preparing composite foam ceramic

A technology of composite foam and foam ceramics, which is applied in the field of materials, can solve the problems of poor mechanical properties and anti-oxidation properties, and achieve the effects of improving anti-oxidation properties, strong adsorption, and inhibiting aging

Inactive Publication Date: 2019-05-10
常州兆威不锈钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] Technical problem to be solved by the present invention: Aiming at the problems of poor oxidation resistance and poor mechanical properties of existing foam ceramics, a preparation method of composite foam ceramics is provided

Method used

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  • Method for preparing composite foam ceramic

Examples

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Effect test

example 1

[0042] Soak the pretreated polyurethane foam in the mixed slurry for 3 hours, place it on a plate press and press it five times to obtain a ceramic foam preform; dry the ceramic foam preform at 80°C for 2 hours to obtain a dry preform ceramic foam body; the dry ceramic foam prefabricated body was sintered at a high temperature of 1400 ° C for 2 hours, and cooled at room temperature to obtain composite foam ceramics. The parts by weight of the pretreated polyurethane foam and the mixed slurry are 20 parts of the pretreated polyurethane foam and 80 parts of the mixed slurry. The specific preparation steps of the pre-treated polyurethane foam are as follows: put the high-resilience polyurethane foam in a sodium hydroxide solution, soak it at room temperature for 3 hours, and dry it at 40°C for 15 minutes to obtain the alkali-treated polyurethane foam; the alkali-treated polyurethane foam Place in polyvinyl alcohol solution, soak at room temperature for 22 hours, and dry at 40°C f...

example 2

[0044] Soak the pretreated polyurethane foam in the mixed slurry for 4 hours, place it on a plate press and press it 7 times to obtain a ceramic foam preform; dry the ceramic foam preform at 85°C for 2.5 hours to obtain a dry ceramic foam Prefabricated body: The dry ceramic foam prefabricated body is sintered at a high temperature of 1500°C for 2.5 hours, and cooled at room temperature to obtain composite foamed ceramics. The parts by weight of the pretreated polyurethane foam and the mixed slurry are 25 parts of the pretreated polyurethane foam and 90 parts of the mixed slurry. The specific preparation steps of the pre-treated polyurethane foam are as follows: put the high-resilience polyurethane foam in a sodium hydroxide solution, soak it at room temperature for 3.5 hours, and dry it at 45°C for 17 minutes to obtain an alkali-treated polyurethane foam; The foam is placed in polyvinyl alcohol solution, soaked at room temperature for 23 hours, and dried at 45°C for 25 minutes...

example 3

[0047] Soak the pretreated polyurethane foam in the mixed slurry for 5 hours, place it on a plate press and press it 10 times to obtain a foamed ceramic preform; place the foamed ceramic preform at 90°C for 3 hours to obtain a dry foamed ceramic preform body; put the dry ceramic foam prefabricated body at 1600°C for high temperature sintering for 3 hours, and cool at room temperature to obtain composite foam ceramics. The parts by weight of the pretreated polyurethane foam and the mixed slurry are 30 parts of the pretreated polyurethane foam and 100 parts of the mixed slurry. The specific preparation steps of the pre-treated polyurethane foam are as follows: put the high-resilience polyurethane foam in a sodium hydroxide solution, soak it at room temperature for 4 hours, and dry it at 50°C for 20 minutes to obtain an alkali-treated polyurethane foam; Place in polyvinyl alcohol solution, soak at room temperature for 24 hours, and dry at 50°C for 30 minutes to obtain pretreated ...

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Abstract

The invention relates to a preparation method of a composite foam ceramic, and belongs to the technical field of materials. According to the invention, zirconium oxide and aluminum oxide are used as raw materials to prepare the composite foam ceramic, and the aluminum oxide is added to generate obvious crack bifurcation and bending to lengthen a crack path, so that the phase change effect of the zirconium oxide is strengthened; and meanwhile, by thermal mismatch of the aluminum oxide and the zirconium oxide, the aluminum oxide is compressed in a matrix, a semi-coherent interface and carbonitriding structure is not easily formed at a crystal boundary, and quite high mechanical strength of the material is maintained. A composite foam ceramic is prepared by taking the polyurethane foam as a foam matrix, the polyurethane foam has an open network structure, it can be ensured that ceramic slurry freely permeates and mutually adheres, the polyurethane foam modified by a surfactant has certainhydrophilicity, the mechanical property of a final product is improved, by the sufficient resilience of the final product, it can be ensured that the shape can be quickly restored after excess slurryis extruded, and the polyurethane foam can be completely gasified without residues during high-temperature sintering.

Description

technical field [0001] The invention relates to a preparation method of composite foam ceramics, which belongs to the field of material technology. Background technique [0002] Ceramic foam is a new type of porous material, which has the advantages of high chemical stability, high strength, high temperature resistance, thermal shock resistance, low density, high porosity, large specific surface area, etc. , chemical catalysis and biomaterials and other fields have shown great application prospects. [0003] Foam ceramics are the third generation of porous ceramics developed after porous ceramics and honeycomb ceramics. They are porous ceramic bodies with high porosity and three-dimensional space grid structure. Ceramic foam has excellent ceramic intrinsic properties such as high melting point, corrosion resistance and wear resistance, and due to the introduction of a large number of pores, it also has low thermal conductivity, controllable permeability, high specific surfa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B35/48C04B35/622
Inventor 方晓俊
Owner 常州兆威不锈钢有限公司
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