Preparation of Oriented Porous Silicon Carbide Bodies by Freeze-Casting Process

Jie Tang; Yu Feng Chen; Hua Wang; Hai Lin Liu; Qi Sheng Fan

doi:10.4028/www.scientific.net/KEM.280-283.1287

Paper Titles

Microstructure and Properties of Reaction-Formed Silicon Carbide
p.1271

Spheroid Growth during Sintering of Copper Coated Silicon Carbide Particles in the Fabrication of Nanocomposite
p.1275

On the Theoretical Model for Radar Absorbing Property of SiC
p.1279

Investigation on Superposition Rule and Influence of Multi-Thermal-Source Temperature Field on SiC Synthesizing
p.1283

Preparation of Oriented Porous Silicon Carbide Bodies by Freeze-Casting Process
p.1287

Gelcasting of Aqueous Silicon Carbide / Carbon Black Slurry
p.1291

Formation Mechanism of Interior Microflaws in the Preparation of Polymer-Derived Silicon Carbide Fibers
p.1297

Fabrication and Characterization of Porous Mullite Coating on Porous Silicon Carbide Support
p.1301

Characterization of Fiber-Reinforced SiC Composites by Precursor-Pyrolysis and Hot-Pressing
p.1305

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Preparation of Oriented Porous Silicon Carbide Bodies by Freeze-Casting Process

Abstract:

Porous ceramics green bodies of silicon carbide were formed by freeze-casting of silicon carbide/carbon black aqueous slurries in a mold where temperature distribution was controlled. The influence of solid loading on the pore structure of green bodies was investigated. Pore morphology of green bodies formed from slurries with various solid loading ranging from 25 to 50vol% experienced a gradual change. Appropriate solid loading of silicon carbide/carbon black slurry was concluded for fabrication of SiC ceramics with oriented pore structure. Two means were employed for changing ice crystallizing velocity, so that the influence of ice crystallizing velocity on pore size of green bodies was explored. It was concluded that pore size became larger under slow freezing condition, whereas smaller with the pre-cooling of silicon carbide/carbon black slurry.