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Preparation method of silicon carbide foam ceramics by thermocurable polycarbosilane

A polycarbosilane and foam ceramic technology, applied in the field of ceramic foam, can solve the problems of high oxygen content, collapsed foam pores, and difficulty in ensuring oxidation uniformity, and achieves the effects of simple preparation process, excellent performance and sufficient raw material sources.

Inactive Publication Date: 2018-11-02
宁波设会物联网科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, during the treatment process in the blast oven, especially for the treatment of large-sized and bulky slurry products, it is also difficult to ensure the uniformity of oxidation: there will be too high local oxygen content; even the polycarbosilane in the inner layer The cross-linking and curing are not completely formed, which will cause the collapse of the foam and the deformation of the pores during the sintering process

Method used

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  • Preparation method of silicon carbide foam ceramics by thermocurable polycarbosilane
  • Preparation method of silicon carbide foam ceramics by thermocurable polycarbosilane

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Experimental program
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Effect test

Embodiment 1

[0045] The preparation method of preparing silicon carbide foamed ceramics with thermally curable polycarbosilane is as follows:

[0046] (1) Preparation of PVCS

[0047] The polycarbosilane synthesized by cracking and rearranging polydimethylsilane has a softening point of 230°C and a number average molecular weight of 1750.

[0048] Add the PCS and tetravinylcyclotetrasiloxane to the reaction kettle at a mass ratio of 1:0.3, add xylene at a ratio of 10ml / g to xylene / PCS, and then use chloroplatinic acid / PCS as the Add chloroplatinic acid at a ratio of 100ppm as a catalyst, vacuumize and replace high-purity argon, then heat to 120°C, keep the temperature for 20 hours, then stop the reaction, cool to room temperature, place the product solution in a distillation device, Under protection, the temperature was raised to 80° C., and the solvent and unreacted silane compound were distilled off under reduced pressure to obtain the product PVCS.

[0049] Using the calculation metho...

Embodiment 2

[0058] The preparation method of preparing silicon carbide foamed ceramics with thermally curable polycarbosilane is as follows:

[0059] The polycarbosilane synthesized by cracking and rearranging polydimethylsilane has a softening point of 220°C and a number average molecular weight of 1700.

[0060] Add the PCS and tri(isoallyloxy)vinylsilane to the reaction kettle at a mass ratio of 1:0.5, add xylene at a ratio of 15ml / g to xylene / PCS, and then mix with chloroplatinic acid Add chloroplatinic acid at a ratio of 100ppm / PCS as a catalyst, vacuumize, replace high-purity argon three times, then heat to 120°C, keep warm for 22 hours, stop the reaction, cool to room temperature, and place the product solution in a distillation device , under the protection of high-purity argon, the temperature was raised to 90 ° C, and the solvent and unreacted silane compound were distilled off under reduced pressure to obtain the product PVCS.

[0061] Using the calculation method for the degr...

Embodiment 3

[0070] The preparation method of preparing silicon carbide foamed ceramics with thermally curable polycarbosilane is as follows:

[0071] The preparation of step (one) PVCS is the same as embodiment 1

[0072] (2) Impregnation to obtain organic foam preform

[0073] The PVCS obtained above is mixed with xylene to form a solution with a viscosity of 40 Pa·s; the organic foam is used as a template, and an organic foam preform is obtained after impregnation.

[0074] Step (three) and (four) are the same as embodiment 2

[0075] Obtain black bright silicon carbide foam ceramics. Bulk density 0.5g / cm 3 , The open porosity is between 85%, and the flexural strength is up to 2.3MPa.

[0076] Using an EMGA-620W model oxygen and nitrogen analyzer, the oxygen content of the silicon carbide foam ceramics prepared above was measured to be 7.5 wt%.

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Abstract

The invention discloses a preparation method of silicon carbide foam ceramics by thermocurable polycarbosilane. In the preparation method, polycarbosilane and silane containing vinyl are synthesized into polycarbosilane with thermocuring property through hydrosilylation, then organic foam preform containing polycarbosilane with thermocuring property are prepared by impregnation with organic foam as template, and the removal of the solvent and cross-linking curing of polycarbosilane are realized through performing thermal treatment on the organic foam preform; at last, silicon carbide foam ceramics are obtained by pyrolysis at high temperature, the preparation method is simple, the cost is low, the shrinkage rate of prepared SiC foam ceramics line is less than 3%, volume density is smallerthan 0.6 g / cm<3>, the open porosity is between 75% and 91%, and the breaking strength is 2.0-2.5 MPa, and can be used at 1,100 DEG C for a long time.

Description

technical field [0001] The invention belongs to the technical field of ceramic foam, and in particular relates to a preparation method for preparing silicon carbide foam ceramics by using heat-curable polycarbosilane. Background technique [0002] Silicon carbide foam ceramics have excellent characteristics: good adaptability, oxidation resistance, corrosion resistance, low thermal expansion coefficient, good thermal stability, low thermal conductivity, high permeability, good fluid adsorption, high selective permeability, energy absorption or resistance Good compressibility, and excellent performance such as small stress load deformation. Widely used in filtration, bioceramics, sound absorption, catalyst carrier and chemical fillers and other fields. In recent years, with the increasing demand for foam ceramics, the preparation of high-performance foam ceramics has become an urgent task. [0003] Since SiC is a strong covalent bond compound, the self-diffusion coefficient...

Claims

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Application Information

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IPC IPC(8): C04B38/06C04B35/571
CPCC04B35/571C04B38/0615C04B2235/658
Inventor 高锦荣江海源
Owner 宁波设会物联网科技有限公司
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