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3 edition of Reaction layer formation at the graphite/copper-chromium alloy interface found in the catalog.

Reaction layer formation at the graphite/copper-chromium alloy interface

Reaction layer formation at the graphite/copper-chromium alloy interface

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Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC], [Springfield, Va .
Written in English

    Subjects:
  • Chromium-copper alloys.,
  • Wetting.

  • Edition Notes

    StatementSandra M. DeVincent and Gary M. Michal.
    SeriesNASA contractor report -- 189147., NASA contractor report -- NASA CR-189147.
    ContributionsMichal, Gary Max., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL17678300M

    During formation and cycling of nickel–metal hydride (NiMH cells), surface corrosion on the metal hydride particles forms a porous outer layer of needle-shaped rare-earth hydroxide crystals. Under this layer, a denser but thinner oxidized layer protects the inner metallic part of the MH electrode powder particles. Nano-sized nickel-containing clusters that are assumed to promote .   The conversion coatings were made on an AZ31B magnesium plate. The plate with a size of was mechanically polished up to no. emery paper, rinsed with deionized water, and cleaned in acetone ultrasonically, followed by drying using a stream of hot air. Prior to immersion, the weight of the coupon was measured by an electronic balance with an accuracy .

    Butt joints of A aluminum alloy and SS steel, with a new type of chamfered edge, are welded by means of metal inert gas welding and ER Al-Si filler metal. The microhardness and microstructure of the joint are investigated. An intermetallic layer is found on the surface of the welding seam and SS steel sheet. The hardness of the intermetallic layer is examined . The ability to synthesize two-dimensional (2D) oxide layers with nonbulk structures on transition-metal surfaces has attracted attention as a method to expand the range of 2D structures and properties beyond those accessible by thinning known layered materials. In this paper, a combination of surface spectroscopies, scanning tunneling microscopy (STM), and density .

      This site uses cookies. By continuing to use this site you agree to our use of cookies. To find out more, see our Privacy and Cookies policy.   Nevertheless, most highly conductive sulfide-type solid electrolytes (such as Li 7 P 3 S 11, Li 10 GeP 2 S 12) have an unstable interface against lithium metal, forming a new interface layer which is commonly composed of Li 2 S, Li 3 P, etc. 34, Another key challenge is the formation of Li dendrite along the voids and grain boundaries in.


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Reaction layer formation at the graphite/copper-chromium alloy interface Download PDF EPUB FB2

The reaction layers adhere to the graphite surface. The copper wets the reaction layer to form a contact angle of 60 deg or less. X-ray diffraction results indicate that the reaction layer is chromium carbide. The kinetics of reaction layer formation were modeled in terms of bulk diffusion by: Get this from a library.

Reaction layer formation at the graphite/copper-chromium alloy interface. [Sandra M DeVincent; Gary Max Michal; United States. National Aeronautics and Space Administration.]. Reaction layer formation at the graphite/copper-chromium alloy interface.

Journal Article Devincent, S M; Michal, G M - Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States) Sessile drop tests were used to obtain information about copper-chromium alloys that suitably wet graphite.

Characterization of. Reaction layer formation at the graphite/copper-chromium alloy interface Sessile drop tests were used to obtain information about copper chromium alloys that suitably wet graphite. Characterization of graphite/copper-chromium alloy interfaces subjected to elevated temperatures were conducted using scanning electron micrography, energy.

Research highlights The wettability improves with increasing Cr content in the alloy as a result of phase transition from Cr 3 C 2 to more wettable and metallic-like Cr 7 C 3 developed at the interface of the Cu–Cr/graphite system. The spreading kinetics is controlled by the interfacial reaction in the early stage and the diffusion of Cr from the drop bulk to the triple Cited by:   As the depletion of Ti the reaction will stop and a layer of Cu will be finally formed at the PyC and CG TiC interface.

In this case, the TiC layer is usually more dense and the grains of TiC are larger, and almost no residual Cu are found at grain boundaries of CG TiC (Fig. 7(a)). The grains of “Cu layer” almost have the same crystalline. As a result, a discontinuous Cr 7 C 3 layer was precipitated at the early stage of interface reaction and resulted in a partially wetting of Sn Cr alloys on CVD diamond.

This inference is supported by the interface microstructure between Sn 2Cr alloy and CVD diamond at °C (see Fig. 6(a)). EDS analysis of the cross-sectional reaction layer (see Figure S2 in supplementary materials) and the XRD patterns acquired at the reaction interface between Sn-V alloys and porous graphite substrates after wetting at °C (see Figure S3 in supplementary materials) indicated that the vanadium carbides were composed of V 2 C, V 8 C 5 or V 6 C 5.

On the other hand, the formation of more TiFe 2 compound resulted in thinning of Ti 3 (Cu,Al) 3 O reaction layer because the Ti element reacted with alumina was limited. If the reaction layer was too thin, it cannot transfer sufficient shear load.

It also led to the result that a low joint strength was gained with a weak brazing parameter. The role of inclusion and pore content on the fracture toughness of powder-processed blended elemental titanium alloys N.

Moody, W. Garrison, J. Smugeresky. Unidirectionally reinforced graphite/copper composites have been fabricated using a pressure infiltration casting procedure.

T and T graphite fibers have been used to reinforce copper and copperchromium alloys. The effects of the chromium level in the copper matrix on the tensile strength, stiffness, and thermal expansion behavior of the composites have been evaluated.

Phase equilibria in the ternary systems M–Si–N and M–B–N (M = Cu, Ag, Au, Zn, Cd, Al, In, Tl, Sn, Pb, Sb, and Bi) at temperatures 50– °C below the melting point of the metal components were investigated by means of x-ray powder analysis and are represented in the form of isothermal sections.

nanostructural oxide layers enriched with phosphates, which enhanc e their bioactivity. The formation of anodic layers: thick or thin, compact or porous, gel-like and nanostructural on titanium and its alloys Ti6Al4V and Ti6Al7Nb in phosphoric acid solutions of different concentrations is described in this charter.

The authors used depth-resolved cathodoluminescence spectroscopy and current-voltage measurements to probe the temperature-dependent formation of native point defects and reaction layers at metal-ZnO interfaces and their effect on transport properties.

These results identify characteristic defect emissions corresponding to metal-Zn alloy versus oxide formation. In this contribution, we investigate the formation and evolution of LiCoO2–LiPON interfaces upon annealing using photoelectron spectroscopy.

We identify interlayer compounds related to the deposition process and study the chemical reactions leading to interlayer formation.

Based on the structure of the pristine interface as well as on its evolution upon annealing, we relate reaction layer. either at the metal/oxide interface, within the bulk oxide or at the oxide/electrolyte interface [19].

Nowadays, it is generally accepted that the oxides simultaneously grow at both interfaces, e.g., at the metal/oxide interface by Al3+ transport and at the oxide/electrolyte interface by oxygen ion transport [21, 24].

By the reaction of the appropriate organometallic precursors and tetrakishydroxymethyl phosphonium chloride (THPC) at the toluene−water interface, we have prepared nanocrystalline films of Au−Ag and Au−Cu alloys with a range of compositions.

The films have been characterized by X-ray diffraction, electron microscopy, optical spectroscopy. The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device.

The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. Titanium carbide (TiC), is the most thermodynamically stable compound in the Ti–C–Cu system, which makes it a suitable reinforcement phase for copper matrix composites.

In this work, the interaction of a Ti–Cu alloy with different forms of carbon was investigated to trace the structural evolution leading to the formation of in-situ TiC–Cu composite structures. The hypoeutectic alloys show two endothermic peaks in DTA, which correspond to the eutectic and the liquidus temperatures.

Three reaction layers are formed at the Sn–Zn/Cu interface without containing Sn: the thick γ–Cu 5 Zn 8 adjacent to the solder, the thin β′–CuZn in the middle, and the thinnest layer adjacent to Cu.

Although many. SEM and TEM Analysis of the Implant–Bone Interface. To investigate the chemical changes in the newly generated tissues during the Mg alloy degradation process, five different regions at increasing distance from the implant were identified based on chemical composition changes from the merged image of the fluorescence and SEM images as shown.

The composition of the oxide film over the entire composition range can be explained in terms of the thermodynamic stability of the oxides of Fe, of, and alloys of all compositions that have been investigated the first reaction is one of selective oxidation, creating a Ni‐rich metal layer at the alloy‐oxide interface.

The core part of the book deals with all important aspects of electroplating, including a systematic discussion of co-deposition of metals and formation of alloys.

It also discusses such related subjects as oxide layer formation and hydrogen evolution as a side reaction.