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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Exploring the ambient metastability of yttrium substituted Bi2O3 electrolyte materials
Not Available
Experimental measurements of surface damage and residual stresses in micro-engineered plasma facing materials
Not provided.
Revisited reaction-diffusion model of thermal desorption spectroscopy experiments on hydrogen retention in material
Desorption phase of thermal desorption spectroscopy (TDS) experiments performed on tungsten samples exposed to flux of hydrogen isotopes in fusion relevant conditions is analyzed using a reaction-diffusion model describing hydrogen retention in material bulk. Two regimes of hydrogen desorption are identified depending on whether hydrogen trapping rate is faster than hydrogen diffusion rate in material during TDS experiments. In both regimes, a majority of hydrogen released from material defects is immediately outgassed instead of diffusing deeply in material bulk when the evolution of hydrogen concentration in material is quasi-static, which is the case during TDS experiments performed with tungsten samples exposed to flux of hydrogen isotopes in fusion related conditions. In this context, analytical expressions of the hydrogen outgassing flux as a function of the material temperature are obtained with sufficient accuracy to describe main features of thermal desorption spectra (TDSP). These expressions are then used to highlight how characteristic temperatures of TDSP depend on hydrogen retention parameters, such as trap concentration or activation energy of detrapping processes. The use of Arrhenius plots to characterize retention processes is then revisited when hydrogen trapping takes place during TDS experiments. Retention processes are also characterized using the shape of desorption peaks in TDSP, and it is shown that diffusion of hydrogen in material during TDS experiment can induce long desorption tails visible aside desorption peaks at high temperature in TDSP. These desorption tails can be used to estimate activation energy of diffusion of hydrogen in material.
Incorporating defects into model predictions of metal lattice-structured materials
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The Importance of Bulk Viscoelastic Properties in “Self-Healing” of Acrylate-Based Copolymer Materials
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Low-cost high-temperature brazing material
Commercially available nickel-copper wire containing 6 and 12 percent nickel is used in high temperature furnace brazing of rocket engine parts. Brazed joints have properties comparable to or better than those brazed with more expensive materials, and cost savings are substantial.
Modifying Metastable Sr 1– x BO 3−δ (B = Nb, Ta, and Mo) Perovskites for Electrode Materials
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Enabling materials informatics for 29Si solid-state NMR of crystalline materials
Not Available
Realizing high conversion efficiency of Mg3Sb2-based thermoelectric materials
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Modeling flow-based electrophoretic deposition for functionally graded materials
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Melting behaviour of simulated radioactive waste as functions of different redox iron-bearing raw materials
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Theoretical investigation of reactive burn in a highly cracked energetic material
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Properties for Thermally Conductive Interfaces with Wide Band Gap Materials
Not Available