Preparation method of high-strength open-hole SiOC ceramic material

A ceramic material and high-strength technology, applied in the field of porous ceramic materials, can solve the problems of difficult control of pore structure and size, limit the application of such materials, and high density of porous ceramics, and achieve low price, low cost, and high porosity. Effect

Inactive Publication Date: 2018-05-18
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These documents and patents have made good progress in porous ceramic materials and applications, but the density of porous ceramics obtained by most methods is high, and the pore structure and size are not easy to control, especially open-pore ceramics with micron and submicron pore sizes. Separation, catalyst support and functional ceramic materials play an important role
Therefore, the current preparation technology of porous ceramic materials greatly limits the application of such materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0025] The preparation method of the high-strength perforated SiOC ceramic material of the present invention specifically comprises the following steps:

[0026] Step 1. Fully stir the organosilicon polymer and the reaction phase separation agent in the solvent, then add the catalyst and mix evenly to obtain a reaction solution, wherein the mass ratio of the organosilicon polymer to the reaction phase separation agent is 1:0.2-5, The mass ratio of the organosilicon polymer to the catalyst is 1:0.0001-0.1, and the added amount of the solvent is 0-30% of the total mass of the organosilicon polymer and the reaction phase separation agent.

[0027] The main chain of the silicone polymer is a Si-O-Si structure, and the side group is a hydrogen atom or a hydrocarbon group composed of 1-12 carbons, including an alkyl, aryl, alkaryl or aralkyl group, which can be specifically It is methyl, ethyl, propyl, butyl, phenyl, vinyl, etc., and the end group is silanol or siloxy, such as metho...

Embodiment 1

[0039] After fully stirring 20g of methoxy-terminated polymethylphenylsiloxane (methyl / phenyl=0.5) and 60g of polymethylstyrene, add 0.5g of ammonia water, mix well, pour into the mold, heat to 180°C, Keep warm for 3 hours, take out the green body, place it in an inert atmosphere, raise it to 300°C at a rate of 2°C / min, keep it warm for 1 hour, then raise it to 900°C at a rate of 5°C / min, keep it warm for 2 hours, and cool naturally to obtain a porous SiOC ceramic material. The inert atmosphere is argon.

[0040] Gained porous SiOC ceramic material density is 0.44g / cm 3 , the porosity is 77%, and the compressive strength is 6.01MPa.

Embodiment 2

[0042] After fully stirring 30g of hydroxyl-terminated polymethylphenylsiloxane (methyl / phenyl=2) with 50g of polyvinyl acetate and 10g of dioxane, add 0.05g of acetic acid, mix well, pour into the mold, and heat to 150°C, keep warm for 5 hours, take out the green body, put it in an inert atmosphere, raise it to 300°C at a rate of 2°C / min, keep it for 1 hour, then raise it to 1100°C at a rate of 5°C / min, hold it for 2 hours, and cool it naturally , to obtain porous SiOC ceramic materials. The inert atmosphere is argon.

[0043] Gained porous SiOC ceramic material density is 0.66g / cm 3 , the porosity is 66%, and the compressive strength is 45.5MPa.

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Abstract

The invention relates to a preparation method of a high-strength open-hole SiOC ceramic material. The preparation method comprises the following steps: taking an organic silicon polymer as a precursorto prepare a blank by molding through a reaction induced phase separation method, then carrying out cracking at an inert atmosphere to obtain the porous SiOC ceramic material, wherein the mass ratioof the organic silicon polymer to a reaction phase separating agent is 1:(0.2-5), the mass ratio of the organic silicon polymer to a catalyst is 1:(0.0001-0.1), and the mass of the addition amount ofa solvent accounts for 0-30% of the total mass of the organic silicon polymer and the reaction phase separating agent. The ceramic material provided by the invention has the characteristics of simpleprocess, low cost, high opening rate of the prepared material, good air permeability, high mechanical strength, thermal shock resistance and the like, can be widely used as a high-temperature filter material, and can also be used as a carrier material and high-temperature heat-insulation material for chemical reactions.

Description

technical field [0001] The invention relates to a preparation method of a high-strength perforated SiOC ceramic material, which belongs to the field of porous ceramic materials. Background technique [0002] Porous ceramics have special properties such as high porosity, high specific surface area, low bulk density and energy absorption or damping properties, as well as the unique high temperature resistance, corrosion resistance, low thermal conductivity, high chemical stability and dimensional stability of the base ceramic material Porous ceramics are widely used in filtration, catalysis, sound absorption, heat preservation and other fields due to their unique physical properties such as sex. The methods for preparing porous ceramics mainly include solid-state sintering, adding pore-forming agents, template replication, foaming, molten salt, and gel injection molding. You can refer to the following review literature: "Preparation of porous ceramics by foaming method, three...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/56C04B35/622C04B38/06
CPCC04B35/5603C04B35/622C04B38/067C04B2235/483C04B2235/77C04B2235/96C04B38/0054C04B38/0067C04B38/0074
Inventor 王筠孔磊严蛟冯志海左小彪
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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