Production and characterization of boron carbide powder by mechanochemical method

Download

BerkayBuyukluoglu-MSThesis_Cilt.pdf

Date

2023-1-27

Author

Büyüklüoğlu, Berkay

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

483
views

396
downloads

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

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Production of boron nitride by carbothermic and mechanochemical methods, and nanotube formation Camurlu, HE; Aydogdu, A; Topkaya, Yavuz Ali; Sevinc, N (2003-09-12) The formation of hexagonal boron nitride by carbothermic reduction of boron oxide and nitridation has been examined. Experiments were conducted in the temperature range of 1100-1500degreesC for durations between 15-240 minutes. Products were examined by X-ray, SEM and chemical analysis. The results showed that the reaction proceeds through a gaseous boron containing species, which is most probably 13203(g). It was found that all of the carbon was consumed and formation of boron nitride was complete in 2 hou...
Production of lightweight aerated alkali-activated slag pastes using hydrogen peroxide Sahin, Murat; Erdoğan, Sinan Turhan; Bayer, Özgür (Elsevier BV, 2018-08-30) This study investigated the production of lightweight aerated alkali-activated slag pastes (LAAASP) using hydrogen peroxide (H2O2). A mixture of sodium hydroxide and sodium silicate solution was used for the activation of slag. Physical, mechanical, and thermal properties of samples cured under different curing conditions were investigated. Various water-to-slag ratios (W/S) and H2O2 contents were used to explore the expansion mechanism of fresh mixtures and to investigate their effect on apparent density. ...
Production and characterisation of PMN-PT piezoceramics modified by yttrium and bismuth Camurlu, HE; Timucin, M (2004-01-01) This study was carried out to investigate the effects of Bismuth (Bi+3) and Yttrium (y(+3)) on the dielectric and piezoelectric properties of Lead Magnesium Niobate-Lead Titanate (PMN-PT) compositional system. The ceramic powders were produced by thermal synthesis using a modified mixed oxide technique. The sintering parameters were optimized for developing piezoelectric ceramics with enhanced piezoelectric strain coefficients.
Characterization and Electrical Conductivity of Poly(ethylene glycol)/Polyacrylonitrile/Multiwalled Carbon Nanotube Composites Aqeel, Salem M.; Kucukyavuz, Zuhal (Wiley, 2011-01-05) Polymer blends based on poly(ethylene glycol), polyacrylonitrile, and multiwalled carbon nanotubes (MWNTs) were prepared by the solvent cast technique from the dispersion of the MWNTs in the concentration range 0-3.45 wt %. The interaction of the MWNTs with the polymer blend was confirmed by a Fourier transform infrared (FTIR) spectroscopy study. The thermal properties of the polymer blend with the MWNTs were carried out by means of differential scanning calorimetry (DSC). It was evident from DSC that the p...
Characterization of Ti-6Al-4V alloy foams synthesized by space holder technique ESEN, ZİYA; Bor, Sakir (2011-03-25) Ti-6Al-4V foams, biomedical candidate materials, were synthesized by powder metallurgical space holder technique as a result of evaporation of magnesium to achieve desired porosity content. Final products contained porosities in the range similar to 43-64% with an average macropore size between 485 and 572 mu m and a lamellar type Widmanstatten microstructure composed of alpha-platelets and beta-laths. Unlike the case of bulk Ti-6Al-4V alloy tested under compression loading, compression stress-strain curves...

Citation Formats

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