Publications by authors named "Seth Iwan"
A boron-rich boron-carbide material (BC) was synthesized by spark plasma sintering of a ball-milled mixture of high-purity boron powder and graphitic carbon at a pressure of 7 MPa and a temperature of 1930 °C. This high-pressure, high-temperature synthesized material was recovered and characterized by X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectroscopy, Vickers hardness measurements, and thermal oxidation studies. The X-ray diffraction studies revealed a single-phase rhombohedral structure (space group R-3m) with lattice parameters in hexagonal representation as = 5.
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- Metal oxide thermal reduction using microwave-induced plasma was employed to create high entropy borides (HEBs), utilizing an argon-rich plasma for efficient energy transfer.
- Two synthesis methods were compared: boro/carbothermal reduction (with carbon) and borothermal reduction (without carbon), revealing distinct differences in microstructural and mechanical properties.
- The HEBs produced with carbon showed greater hardness (38 ± 4 GPa) and density, as well as reduced porosity, compared to those made without carbon (28 ± 3 GPa).
Article Synopsis
- High-entropy borides (HEB) with multiple metal elements show promise for materials that can withstand extreme conditions due to their crystalline stability, strength, and thermal resistance.
- The study explores HEBs like (Hf, Mo, Nb, Ta, Ti)B and (Hf, Mo, Nb, Ta, Zr)B through theoretical modeling and extensive experiments at high pressures and temperatures, yielding significant findings.
- Results reveal a bulk modulus of about 276 GPa and compressive yield strength of 28 GPa at 65 GPa pressure, indicating their suitability for use in demanding applications like nuclear and aerospace technology.