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Showing 1 to 20 of 165 for “"Tantalum"”.
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Corrosion studies on alpha tantalum and beta tantalum coated steel
Tantalum coating by sputtering, one form of physical vapor deposition (PVD), has been investigated as a replacement for chromium coatings on gun bores to protect them from erosion and corrosion due to its high ductility and high corrosion resistance in aggressive environments. When deposited as a …
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Nanocrystalline copper-tantalum composites
This research investigated the physical metallurgy, high temperatures coarsening, and processing/structure relationships for Cu$\sb{\rm 1-x}$Ta$\sb{\rm x}$ (x = $\sim$5 to 20 atomic percent) alloys. These metastable alloys were produced using a plasma assisted physical vapor deposition (PAPVD) …
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The system tantalum-rhenium
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Metallurgy, 1960.
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Light Scattering From Tantalum-Diselenide
Made available in DSpace on 2015-05-13T15:22:16Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7915326.PDF: 4050739 bytes, checksum: db8b84b58c9ed465f3ca7fc2f5203a35 (MD5) Previous issue date: 1979
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Hydrogen in niobium-tantalum superlattices
Hydrogen has been dissolved in Nb/Ta superlattices for which the structural and thermodynamic properties of this new H-metal system were studied, in situ, by x-ray diffraction. It is found that H induces a strain modulation exhibiting a Curie-Weiss type temperature dependence, thus, providing a …
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Light scattering from tantalum diselenide
… light scattering properties of the 2Hpolytype of tantalum diselenide has been carefully studied. Below a 120 K phase transition, incommensurate charge density waves appear which introduce .additional structure into the Raman spectra. The charge density waves become commensurate below a 110 K phase …
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The Solubility of Hydrogen in Tantalum
Made available in DSpace on 2014-12-12T01:04:11Z (GMT). No. of bitstreams: 1 7511772.pdf: 1690748 bytes, checksum: 185edd287d9cab0b2d6c2e8920d994d0 (MD5) Previous issue date: 1974
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Sol-gel derived tantalum oxide thin films
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1987.
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Deposition and characterization of magnetron sputtered BCC tantalum
… results for developing and characterizing tantalum (Ta) coatings on steel substrates deposited by DC magnetron sputtering. Deposition of tantalum on steel is of special interest for the protection it offers to surfaces, e.g. the surfaces of gun barrels against the erosive wear of hot …
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Low temperature anomalies in niobium, vanadium and tantalum
The specific heats of superconducting Nb, V and Ta and of normal Ta have been measured in the temperature range 0.05 - 2 K in an outgassed condition and with H or D added as interstitial solutes. The presence of H or D in these bcc transition metals produces an isotope dependent specific heat …
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Examining Tantalum-Based Photocatalysts for Photoinactivation of E. coli
… of E. coli. This work helped to determine if tantalum pentoxide (Ta2O5) and tantalum oxynitride (TaON) can photoinactivate E. coli (DH5-Alpha). The results support the extrapolation that these two tantalum-based oxides have the ability to photoinactivate E. coli, but quantification is arduous …
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Microstructural formations and phase transformation pathways in tantalum carbides
… resistance, and high melting temperatures. Tantalum carbide (TaC) and its sub-stoichiometric Ta2C and Ta4C3 phases have emerged as candidate materials for ultra-high temperature structural applications. A consequence of the high melting temperature is the limiting methods to fabricate …
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Microstructures and oxidation properties in hafnium-tantalum-nitride ceramics
Ultra high temperature ceramics (UHTC) comprise a class of materials characterized by high melting points, chemical inertness, high hardness, and moderate oxidation. These ceramics typically comprise either group IV or V metals bonded with boron, carbon or nitrogen. When in equal atomic ratio, a MX …
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Synthesis, characterisation and properties of tantalum based inorganic nanofibres
… is a common theme throughout. High aspect ratio tantalum disulfide, TaS2 nanofibres were prepared from a 1:2 stoichiometric mixture of elemental powders in a one-step synthesis utilising silica ampoules. A surface assisted growth phenomena was investigated and found to significantly increase the …
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A study of the properties of tantalum - molybdenum alloys
Thesis (Ph.D.) Massachusetts Institute of Technology. Dept. of Chemistry, 1949.
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In search of martensite : titanium-tantalum shape-memory alloy
… concerning the potential of SME-capable titanium-tantalum alloys to replace Ni-based alloys in medical implants. A method for heat treatment of Ti -Ta alloys of varying compositions to induce formation of martensite was developed. Heat-treated alloys were then tested for SME and superelastic …
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Interdiffusivity in titanium-tantalum alloys processed at 1473 K
Titanium-tantalum (Ti-Ta) alloys are likely to have a high biocompatibility and corrosion resistance that renders them novel materials of interest for biomedical applications[7, 14, 2]. With high strength and a low elastic modulus, Ti-Ta alloys have attracted attention as candidates for such uses …
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