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.
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Example Embodiment
[0044] Example 1:
[0045] The preparation method for preparing silicon carbide foam ceramics with heat-curable polycarbosilane is as follows:
[0046] (1) Preparation of PVCS
[0047] The polycarbosilane synthesized by pyrolysis and rearrangement of polydimethylsilane has a softening point of 230°C and a number average molecular weight of 1750.
[0048] The PCS and tetravinylcyclotetrasiloxane were added to the reactor at a mass ratio of 1:0.3, and xylene was added at a ratio of xylene / PCS of 10ml / g to be uniformly mixed, and then chloroplatinic acid / PCS was used as Add chloroplatinic acid as a catalyst at a ratio of 100 ppm, vacuum to replace high-purity argon, then heat to 120°C, keep the reaction for 20 hours, and stop the reaction. After cooling to room temperature, place the product solution in a distillation apparatus and place it in the high-purity argon. Under protection, the temperature is raised to 80°C, and the solvent and unreacted silane compound are distilled off under...
Example Embodiment
[0057] Example 2:
[0058] The preparation method for preparing silicon carbide foam ceramics with heat-curable polycarbosilane is as follows:
[0059] Polycarbosilane synthesized by cracking and rearrangement of polydimethylsilane has a softening point of 220°C and a number average molecular weight of 1700.
[0060] Add the PCS and tris(isoallyloxy)vinylsilane to the reaction kettle at a mass ratio of 1:0.5, add xylene at a ratio of xylene / PCS of 15ml / g, and mix it with chloroplatinic acid. Add chloroplatinic acid in the ratio of 100ppm as a catalyst, vacuumize, replace high-purity argon for three times, then heat to 120℃, keep the reaction for 22h, stop the reaction, cool to room temperature, place the product solution in the distillation device Under the protection of high-purity argon, the temperature is raised to 90°C, and the solvent and unreacted silane compounds are distilled off under reduced pressure to obtain the product PVCS.
[0061] According to the calculation method o...
Example Embodiment
[0069] Example 3:
[0070] The preparation method for preparing silicon carbide foam ceramics with heat-curable polycarbosilane is as follows:
[0071] Step (1) The preparation of PVCS is the same as in Example 1
[0072] (2) Dipping to obtain organic foam preform
[0073] The PVCS obtained above and xylene are mixed to form a solution with a viscosity of 40 Pa·s; organic foam is used as a template to obtain an organic foam preform after immersion.
[0074] Steps (3) and (4) are the same as in Example 2
[0075] A black bright silicon carbide foam ceramic is obtained. Bulk density 0.5g / cm 3 , The open porosity is between 85%, and the flexural strength reaches 2.3MPa.
[0076] Using an EMGA-620W model oxygen and nitrogen analyzer, the oxygen content of the silicon carbide foam ceramic prepared above was measured to be 7.5 wt%.
PUM
Property | Measurement | Unit |
---|---|---|
Softening point | aaaaa | aaaaa |
Bulk density | aaaaa | aaaaa |
Flexural strength | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap