SiC ceramic foam material is a closed loop polygon as the basic unit, the base unit communicating with each other to form a three-dimensional network structure, the material sheet having a corrugated shape of a pleated, corrugated or smooth shape may be triangular waveform.
These problems make the application of SiC foam ceramics, especially the new application, subject to different constraints.
Development and Application
Silicon carbide foamed ceramics
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Mechanical p roperties
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Introduc tion
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ቤተ መጻሕፍቲ ባይዱ
Fabricating methods
Development an d Application
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Mechanical properties
SiC foam as a catalyst carrier
SiC foam ceramic filter
biomimetic approach silicon carbide whiskers
Silicon carbide ceramic foam packing
Combustor with silicon carbide
Fabricating methods
powder sintering method
solid-phase reaction sintering method
silicon resin pyrolysis
vapor deposition
powder sintering method Powder sintering method is to contain a certain amount of silicon carbide powder and a sintering aid linking agent (such as hydrolyzed ethyl silicate, silica sol, etc.) into a suitable slurry concentration after enrobing the polyurethane foam, curing After drying at 200 ~ 600 ° C range prolapse linking agent and a polyurethane foam, and then, the temperature was raised to between 1500 ~ 2200 ° C so obtained sintered silicon carbide ceramic foam.
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The four methods have their own shortcomings
The first three methods because there is no pressing process, the initial density is not high, the preparation of silicon carbide ceramic foam is not dense, and thus low intensity, and the solid-phase reaction sintering method and the silicone resin pyrolysis pore volume and size is difficult to control; while Vapor Deposition face high production costs, slow and other issues.
Silicon carbide ceramic foam as a new functional material having light weight, high dielectric constant, large surface area, excellent chemical resistance, in a harsh environment for a long time used in the aerospace, electronics , bio-medicine, metallurgy, composite materials and other fields with a wide range of applications
solid-phase reaction sintering method
Solid-phase reaction sintering method is a The strains like blowing agent homogeneously mixed with silica and carbon molding, extrusion foaming by melting or vaporization, obtained after high temperature reaction sintering silicon carbide ceramic foam.
vapor deposition
Vapor deposition method is a chemical vapor deposition method using silicon carbide deposited onto the carbon fiber weave mesh body to obtain silicon carbide ceramic foam.
Silicon carbide heat exchanger
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Mechanical properties
80-95 parts of silicon carbide micro powder particles, 5-20 parts of polycarbosilane powder and 40-170 parts of organic solvent. A template of the silicon carbide foamed ceramics is made of polymeric sponge.
silicon resin pyrolysis
Silicone resin pyrolysis is silicone precursor a polymer gel, the gel extrusion of the organic solvent to give a foam-like silicon resin, the full preoxidation is obtained after pyrolysis of silicon carbide foam.