Fabrication of Porous Silicon Nitride with High Porosity

Shao Yun Shan; Jian Feng Yang; Ji Qiang Gao; Wen Hui Zhang; Zhi Hao Jin; Rolf Janßen; Tatsuki Ohji

doi:10.4028/www.scientific.net/KEM.336-338.1105

Paper Titles

Processing and Characterization of Carbothermal Reduction and Nitridation from Kaolinite-Polyacrylamide Intercalation Compound
p.1093

Fabrication of Reticulated Porous Ceramics with Controlled Structure by Centrifuging Process
p.1096

Preparation of Porous Ceramic Support with Inorganic Filtration Membrane
p.1099

Preparation of Porous Wollastonite Ceramics for Filtration
p.1102

Fabrication of Porous Silicon Nitride with High Porosity
p.1105

Properties and Application of Oriented Porous SiC as Transpiration Cooling Materials
p.1109

Fabrication of Porous Cellular SiC Ceramics from Wood by Embedding in Si/SiO₂ Powder Mixture
p.1113

Study of Affecting Factors on Porosity in Gel-Casting Foam
p.1117

Preparation and Characterization of ZrO₂ Microspheres by Internal Gelation Process
p.1121

HomeKey Engineering MaterialsKey Engineering Materials Vols. 336-338Fabrication of Porous Silicon Nitride with High...

Fabrication of Porous Silicon Nitride with High Porosity

Abstract:

In this study, porous Si3N4 ceramics were fabricated by carbothermal reduction reaction between silicon dioxide and carbon. The influences of different starting powders and sintering additives on microstructure and mechanical properties were investigated. XRD analysis demonstrated the formation of single-phase β-Si3N4 except for glass phase and minor of α-Si3N4 phase. SEM analysis showed that the resultant porous Si3N4 ceramics occupied fine microstructure and uniform pore structure. The samples with fine starting powder showed fine, high aspect ratio of β-Si3N4 grains and good mechanical properties. The addition of Al2O3 accelerated the densification of porous Si3N4 ceramics. With an increasing in the sintering additive content, the porosity decreased, the flexural strength increased.