@article { author = {Haghshenas Gorgani, Mehran and Mirkazemi, S. M. and Golestani Fard, Farhad}, title = {Fabrication and Characterization of Porous Silicon Nitride Bodies through Starch Consolidation Casting and Pressureless Sintering}, journal = {Advanced Ceramics Progress}, volume = {5}, number = {Issue 2}, pages = {32-38}, year = {2019}, publisher = {Materials and Energy Research Center (MERC) Iranian Ceramic Society (ICERS)}, issn = {2423-7477}, eissn = {2423-7485}, doi = {10.30501/acp.2019.95731}, abstract = {Porous Si3N4 ceramics were prepared by a novel colloidal method called starch consolidation casting. In this method, starch plays both pore-forming and consolidating roles. The effect of starch content on the viscosity of Si3N4/starch slurry was investigated in this research. Rotational Rheometer was used to study the rheological behavior of Si3N4/starch slurry. Green samples with 5 to 10MPa flexural strength were shaped by casting slurries in a nonporous mold and held at 80°C for 120min. Afterward the samples burned-out and sintered at 1650°C for 4h in an air furnace under a nitride powder bed condition. Thermal behavior, phase evolution, and microstructure of sintered samples were characterized through Thermogravimetric analysis (TGA), X-ray diffraction (XRD), and scanning electron microscope (SEM). The XRD results showed that was the main phase in the sintered samples. The  phase content was as much as 90wt% in the sintered samples. Finally, a porous silicon nitride sample was successfully produced with 44vol% open porosity and Flexural strength of 108.9MPa through the starch consolidation casting method. }, keywords = {Starch Consolidation,Gel-Casting,Porous Ceramics,Si3N4}, url = {https://www.acerp.ir/article_95731.html}, eprint = {https://www.acerp.ir/article_95731_7526a20b86060c11a502314f099d1a59.pdf} }