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Synthesis of the in-Situ Si₃N₄-SiC Composite Nano Powders by Carbothermal Reduction

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Çalışkan F., Kocaman E., Cömert S.

Acta Physica Polonica A

2017

vol. 131

issue 3

601-604

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.

Fabrication of Functional Graded Al2124 Composite Reinforced with Al₂O₃ Particles

100%

Çalışkan F., Cömert S., Kocaman E.

Acta Physica Polonica A

2017

vol. 131

issue 3

437-439

The composite materials formed by powder metallurgy are mostly used in industry due to their excellent properties such as low density, high strength, and hardness. The aim of this study is to produce functional graded Al material reinforced with macro-sized Al₂O₃. To fabricate the aluminum matrix composite, commercial Al 2124 aluminum alloy powder (from Gürel Makina), which is used in aerospace and defense industries, was chosen as a matrix material. Powder metallurgy was used to produce the functional graded material because it allows an easy incorporation of reinforcement phase into the matrix. The sintered samples were characterized using optical microscopy, SEM, and X-Ray diffraction analysis. The results show that functional graded material structure and the transition interlayers were achieved by the presented process.

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2 Acta Physica Polonica A

2 2017

2 Cömert S.

2 Kocaman E.

2 Çalışkan F.

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Synthesis of the in-Situ Si₃N₄-SiC Composite Nano Powders by Carbothermal Reduction

Fabrication of Functional Graded Al2124 Composite Reinforced with Al₂O₃ Particles