Production and characterization of boron carbide powder by mechanochemical method

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BerkayBuyukluoglu-MSThesis_Cilt.pdf

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2023-1-27

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Büyüklüoğlu, Berkay

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In this study, the production of boron carbide (B4C) powders at room temperature by mechanochemical alloying is investigated. The conventional production methods of this industrially important material requires high energy consumption, whereas the low energy production methods could only produce small amounts. By optimizing the mechanochemical alloying, the know-how for the larger scale production is developed. The mechanochemical method consists of mechanical grinding and acid leaching to remove by-products and impurities from the system. A mechanical chamber is designed with high friction strength, resistance to pressure and temperature and that is also suitable for scaled-up production while avoids large amounts of contamination. The process parameters, namely ball to powder ratio (BPR), ball mill speed (RPM), and grinding time are optimized. For the second stage, acid leaching, the parameters acid molarity, magnetic stirrer table speed, and temperature, and leaching time are optimized. The powders that produced with different processing parameters are characterized for present phases, particle size and morphology by X-ray diffraction (XRD), laser diffraction, and scanning electron microscopy (SEM), respectively. Also, kinetics of B4C formation is studied. Within the scope of these studies, boron carbide particles with a particle size of approximately 2 µm and a purity of 98% are produced by mechanochemical method at room temperature with low energy consumption.

Subject Keywords

Boron carbide, Mechanochemical operation, Ball mill, Mechanical alloying, Acid leaching, Room temperature production

URI

https://hdl.handle.net/11511/102529

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

B. Büyüklüoğlu, “Production and characterization of boron carbide powder by mechanochemical method,” M.S. - Master of Science, Middle East Technical University, 2023.