Synthesis of the in-Situ Si3N4-SiC Composite Nano Powders by Carbothermal Reduction |
F. Çalışkana, E. Kocamanb and S. Cömerta
aSakarya University, Faculty of Technology, Department of Metallurgical and Materials Engineering bBulent Ecevit University Faculty of Engineering Department of Metallurgical and Materials Engineering |
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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°C for 4 hours under N2 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°C. Determination of the Si3N4/SiC ratio was possible with sensitive control of the system conditions. |
DOI: 10.12693/APhysPolA.131.601 PACS numbers: 81.05.-t |