Omar Cedillos-Barraza

Omar Cedillos-Barraza
University of Texas at El Paso | UTEP · Department of Mechanical Engineering

PhD, Imperial College London, UK

About

11
Publications
2,555
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372
Citations
Additional affiliations
September 2016 - present
University of Texas at El Paso
Position
  • Professor (Assistant)
October 2011 - August 2015
Imperial College London
Position
  • PhD Student

Publications

Publications (11)
Research
Found that Ultra-High Temperature Ceramics have high Vickers hardness, chemical stability, low vapor pressures, high melting points, good thermal shock resistance, good under compression, and high modulus of elasticity.
Research
The motivation of this investigation is to be more aware of the synthesis and processing of (TaC-HfC) ultra-high temperature composite ceramics for hypersonic flight or propellant applications in the field of engineering. Being known that there are many ways synthesized and process materials. Based on this investigation I was able to find that TaC-...
Article
Full-text available
TaC, HfC and their solid solutions are promising candidate materials for thermal protection structures in hypersonic vehicles because of their very high melting temperatures (>4000 K) among other properties. The melting temperatures of slightly hypostoichiometric TaC, HfC and three solid solution compositions (Ta1−xHfxC, with x = 0.8, 0.5 and 0.2)...
Article
Solid solution formation and sintering behaviour of TaC–HfC ceramics made from commercial TaC and HfC powders prepared using spark plasma sintering (SPS) at temperatures up to 2450 °C was investigated. Phase analysis and lattice parameter measurements using X-ray Diffraction (XRD) showed mutual diffusion of Hf and Ta with increasing sintering tempe...
Conference Paper
Tantalum carbide (TaC), hafnium carbide (HfC) and compounds in the TaC-HfC system have extremely high melting points (>3700ºC) making them potential candidates for thermal protection structures in hypersonic space vehicles. Information regarding mechanical and thermal properties of these compounds and their solid solutions is scarce, hence the impo...
Article
Micro-cavities on the surface of dense ZrB2/20 vol.% SiC composites, machined by ultra-fast laser ablation, were filled with Gd2O3 nanopowder and oxidized in static air at 1600 °C. Optimized rectangular pattern of cavities, 10 μm diameter and deep, 20 μm apart conferred improved oxidation resistance compared to the untreated ZrB2/20 vol.% SiC due t...
Article
Full-text available
Pure ZrB2 powder was Flash sintered in an SPS furnace (FSPS). The samples were densified up to 95.0% in 35 s under an applied pressure of 16 MPa. Compared to Conventional SPS (CSPS), the newly developed FSPS technique resulted in an unprecedented energy and time savings of about 95% and 98% respectively. ZrB2 monoliths obtained by CSPS and FSPS wer...
Conference Paper
Compounds of the TaC-HfC system have extremely high melting points (e.g. 4TaC-1HfC: 3990°C) making them candidates for thermal protection structures in hypersonic space vehicles. Compounds of 4TaC-1HfC were synthesised and sintered using various methods. Commercial powders of TaC and HfC were mixed with 0.5 wt% C and B4C as sintering aids and sinte...
Conference Paper
Compounds of the TaC-HfC system have extremely high melting points (4TaC-1HfC: 3990°C, 5TaC-1HfC: 3950°C, 3TaC-1HfC: 3890°C), making them potential candidates for thermal protection structures in hypersonic space vehicles. TaC-HfC compounds have been synthesised and sintered using various methods and techniques. Self-propagating high-temperature sy...
Conference Paper
Compounds in the TaC-HfC system have extremely high melting points (>3900°C), making them potential candidates for thermal protection structures in hypersonic vehicles. Self-propagating High-temperature Synthesis (SHS) and Reactive Spark Plasma Sintering (RSPS) are used in this work to fabricate TaC-HfC Ultra High Temperature Ceramics (UHTCs). Six...
Poster
Ternary compounds the TaC-HfC systems have extremely high melting points, making them potential candidates for thermal protection structures in hypersonic space vehicles. Information about this system is scarcely available, only melting points and some oxidations studies are known. Three different compositions have been selected (4TaC-1HfC, 3TaC-1H...

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