Results 221 to 230 of about 11,543 (271)

Electron spectroscopic studies of tantalum carbide

Surface Science Letters, 1985
Abstract Carbon-K characteristic loss, carbon-KVV Auger, and valence-band X-ray photoelectron spectra were measured for a well-ordered, nearly stoichiometric (100) surface of tantalum carbide. These spectra compare well with curves that were generated by using a calculated total density of states.
G.R. Gruzalski, D.M. Zehner, G.W. Ownby
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Vaporization of Tantalum Carbide‐Hafnium Carbide Solid Solutions

Journal of the American Ceramic Society, 1965
The vaporization rates in vacuum of hot‐pressed HfC, TaC, and solid solutions of these carbides in the range 2225° to 2725°C were determined by a Langmuir‐type method. A composition near 80TaC.ZOHfC (mole %) exhibited the lowest vaporization rate of the compositions within this pseudobinary system.
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Femtosecond pulsed laser ablation deposition of tantalum carbide

Applied Surface Science, 2007
In this work a frequency-doubled Nd:glass laser with a pulse duration of 250 fs has been used to ablate a TaC target and to deposit thin films on silicon. The results have been compared with those previously obtained by nanosecond pulsed laser deposition and evidence of large differences in the plasma characteristics has been revealed.
R Teghil, A De Bonis, A Galasso, P Villani, A Santagata   +4 more
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Low Temperature Tungsten, Tungsten Carbide and Tantalum Carbide Film Growth

MRS Proceedings, 2000
Abstract:Low temperature chemical vapor deposition of tungsten, tungsten carbide and tantalum carbide films on SiO2/Si(100) surfaces was studied by X-ray photoelectron spectroscopy (XPS) and electron microscopy. Tungsten carbide films were deposited using the W(CO)6precursor with and without ethylene over temperatures ranging from 250 to 500 °C.
Y.-M. Sun, S.Y. Lee, E. R. Engbrecht, K. Pfeifer, S. Smith, J. M. White, J. G. Ekerdt   +6 more
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Analyzing Tantalum Carbide (TaC) and Hafnium Carbide (HfC) for Spacecraft Material

2021
Spacecraft needs thermal protection systems material that rise more than ±1.260 °C on nose cap and wing leading edge. It depends on the heat loading encountered during the re-entry of the orbiter into the atmosphere. Recently, the spacecraft uses thermal protection system (TPS) materials like reinforced carbon-carbon (RCC), High-Temperature Reusable ...
Sovian Aritonang, W. S. Ezha Kurniasari, Riyadi Juhana, Tutut Herawan   +3 more
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Tantalum carbide ohmic contacts to n-type silicon carbide

Applied Physics Letters, 1999
Tantalum carbide contacts with and without Au, Pt, and W/WC overlayers on n-type 6H–SiC (0001) were ohmic after annealing at temperatures between 800 and 1075 °C. Specific contact resistivities (SCRs) were calculated from current–voltage measurements of transmission line model patterns at temperatures ranging from 20 to 400 °C in air.
T. Jang, L. M. Porter, G. W. M. Rutsch, B. Odekirk   +3 more
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VAPOUR-PHASE SYNTHESIS OF SUBMICRON TANTALUM CARBIDE

Powder Metallurgy, 1971
AbstractThe synthesis of pure, submicron, crystalline TaC powder by the vapour-phase reaction of methane and TaCl5 has been studied in the range 1400–1600°C (1673–1873 K). Particular attention was given to the effect of process variables on particle characteristics.
PHILIP H. CRAYTON, MARVIN C. GRIDLY
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THE EFFECT OF COMPOSITION ON THE POROSITY, STRUCTURE, AND PROPERTIES OF NICKEL-TANTALUM, NICKEL-TANTALUM CARBIDE, AND NICKEL-TANTALUM-TANTALUM CARBIDE ALLOYS

Powder Metallurgy, 1963
AbstractA series of alloys has been produced from nickel powder, tantalum metal powder, and tantalum carbide powder, by powder-metallurgical techniques. A typical analysis of the powders is given.The effect of increasing additions of tantalum and tantalum carbide to nickel, both singly and in combination, has been investigated.
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High temperature erosion of tantalum carbide composites

Wear, 1976
Abstract Selected compositions of tantalum carbide composites containing excess free carbon and tungsten-rhenium were tested for erosion resistance at 1800 °C and room temperature. Specimens were fabricated at 2150 °C using hot pressing techniques. Tantalum carbide exhibited superior erosion resistance at both temperatures and displayed evidence of ...
L. Honeycutt, W.H. Jennings, C.R. Manning   +2 more
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Electron Spectroscopic Studies of Substoichiometric Tantalum Carbide

MRS Proceedings, 1985
ABSTRACTXPS was used to determine core-level binding energies and valence-band structure for TaCx over the range 0.5 ≲ × ≲ 1.0. As x decreased, the carbonls binding energy (BE) changed very little, the carbon-2s BE shifted toward the Fermi level, the position of the p-d valence-band peak shifted toward the Fermi level more, and the tantalum-4d and -4f ...
G. R. Gruzalski, D. M. Zehner, G. W. Ownby   +2 more
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