Synthesis of the in-Situ Si<sub>3</sub>N<sub>4</sub>-SiC Composite Nano Powders by Carbothermal Reduction
F. Caliskan, S. Comert, E. Kocaman
proceeding (Uluslararası, Hakemli) | Yazar(lar): F. Caliskan, S. Comert, E. Kocaman | Yıl: 2017 | Dergi/Kurum: ACTA PHYSICA POLONICA A | İndeks: WOS.SCI,WOS.ISTP | DOI: 10.12693/aphyspola.131.601 — Özet: Si3N4-SiC micro-nano composite powder has been studied by a group of authors during the last decade. Previous works
Si3N4-SiC micro-nano composite powder has been studied by a group of authors during the last decade. Previous works have shown that SiC-Si3N4 ceramics exhibits good mechanical properties and high corrosion resistance at elevated temperatures. In this study, we have tried a new approach to obtaining SiC-Si3N4 ceramic composite powder by changing the conditions in the carbothermal reduction process. Starting powders were quartz mineral, received from Ege-Sil Co., as silicon-source and, carbon, as silica-reducing and carburizing agent. These powders were ground in the ring mill, separately and together. Carbothermal reduction-nitridation/carburization reactions were carried out in a tube furnace at > 1400 degrees C for 4 hours under N-2 and Ar gas, used as nitriding and shielding atmosphere. The synthesized powders were characterized by X-ray diffraction, SEM, and EDS. Results have shown that production of Si3N4-SiC micro-nano composite powder was achieved in the modified nitrogen and argon atmosphere above 1400 degrees C. Determination of the Si3N4/SiC ratio was possible with sensitive control of the system conditions.