The etch rate of 4H–SiC in a SF6 helicon plasma has been investigated as a function of pressure, power injected in the source, substrate bias voltage, and distance between the substrate holder and the helicon source. The highest etch rate yet reported of 1.35 mm/min along with good uniformity on 2 in. SiC substrates was achieved when this distance was minimum. Smooth etched surfaces free of mic...

Micro-coiled fibers of carbon, Sic, Si N Tic, ZrC and Hf C were prepared by a metal-impurity activa?e%'chemical vapor deposition or vapour phase metallizing of the coiled carbon fibers. The growth conditions, morphology, growth mechanism and some properties were examined. The double-coiled carbon fibers were prepared using acetylene as a carbon source and various powders or plates of transition...

Composites of the Cu47Ti34Zr11Ni8 bulk metallic glass, reinforced with up to 30 vol % SiC particles are synthesized and characterized. Results based on x-ray diffraction, optical microscopy, scanning Auger microscopy, and differential scanning calorimetry ~DSC! are presented. During processing of the composites, a TiC layer forms around the SiC particles and Si diffuses into the Cu47Ti34Zr11Ni8...

SiC/Fe and MoSi2/Ni interfaces are investigated using first principles calculations in order to determine the structure of the interfaces and calculate ideal adhesion energies. As a baseline for comparison, calculations were also performed on the Cr/Fe interface, which shows strong adhesion, even stronger than the intrinsic adhesion of Fe. Both ceramic/metal interfaces show good adhesion. Evide...

We report the first Fe isotopic anomalies and the first Ni isotopic ratio measurements in presolar SiC grains of separate KJG from the Murchison meteorite. With NanoSIMS, we analyzed Fe and Ni in 37 X grains from Type II supernovae and 53 SiC grains of other types. TheNi/Fe and Co/Fe ratios in grains of all types aremuch higher than in the gas from which the grains are believed to have condense...

Energy-efficient CH4-CO2 valorization to fuels and chemicals presents an urgent need considering the great variety of methane sources removal greenhouse gases. In present work, microwave-assisted dry reforming methane, DRM, has been carried out in a custom-designed rectangular mono-mode microwave applicator over several catalyst-support combinations, i.e., Pt/C, Ni/Al2O3, mechanical mixture Ni/...

In this study, we investigated the characteristics of n-type Ni/SiC ohmic contact using laser annealing process on thin wafers. The electrical behavior contacts was tested in 4H-SiC JBS diode devices. As a result, wafer thickness 100 μm achieved forward voltage 1.33 V at 20 A with Ni silicide. Using μm, an on-resistance decrease almost 22% demonstrated. Based our experimental results, suggest a...