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8 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on ZrCu(O2F3)2 by Materials Project

ZrCu(O2F3)2 crystallizes in the monoclinic P2_1/c space group. The structure is one-dimensional and consists of two ZrCu(O2F3)2 ribbons oriented in the (1, 0, 1) direction. Zr is bonded to six F atoms to form ZrF6 octahedra that share corners with two equivalent CuO4F2 octahedra. The corner-sharing octahedral tilt angles are 17°. There are a spread of Zr–F bond distances ranging from 2.02–2.08 Å. Cu is bonded to four O and two equivalent F atoms to form CuO4F2 octahedra that share corners with two equivalent ZrF6 octahedra. The corner-sharing octahedral tilt angles are 17°. All Cu–O bond lengths are 1.80 Å. Both Cu–F bond lengths are 2.36 Å. There are two inequivalent O sites. In the first O site, O is bonded in a single-bond geometry to one Cu atom. In the second O site, O is bonded in a single-bond geometry to one Cu atom. There are three inequivalent F sites. In the first F site, F is bonded in a single-bond geometry to one Zr atom. In the second F site, F is bonded in a single-bond geometry to one Zr atom. In the third F site, F is bonded in a distorted linear geometry to one Zr and one Cu atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ZrCu(PO6)2 by Materials Project

ZrCu(PO6)2 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. Zr is bonded to six O atoms to form ZrO6 octahedra that share corners with six equivalent PO4 tetrahedra. There are a spread of Zr–O bond distances ranging from 2.08–2.11 Å. Cu is bonded to six O atoms to form distorted CuO6 octahedra that share corners with two equivalent PO4 tetrahedra. There are a spread of Cu–O bond distances ranging from 1.82–2.18 Å. P is bonded to four O atoms to form PO4 tetrahedra that share a cornercorner with one CuO6 octahedra and corners with three equivalent ZrO6 octahedra. The corner-sharing octahedra tilt angles range from 16–52°. There is three shorter (1.54 Å) and one longer (1.57 Å) P–O bond length. There are six inequivalent O sites. In the first O site, O is bonded in a bent 150 degrees geometry to one Zr and one P atom. In the second O site, O is bonded in a single-bond geometry to one Cu atom. In the third O site, O is bonded in a bent 120 degrees geometry to one Cu and one P atom. In the fourth O site, O is bonded in a linear geometry to one Zr and one P atom. In the fifth O site, O is bonded in a single-bond geometry to one Cu atom. In the sixth O site, O is bonded in a bent 150 degrees geometry to one Zr and one P atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ZrCu by Materials Project

CuZr is Tetraauricupride structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Zr is bonded in a body-centered cubic geometry to eight equivalent Cu atoms. All Zr–Cu bond lengths are 2.83 Å. Cu is bonded in a body-centered cubic geometry to eight equivalent Zr atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ZrCu by Materials Project

CuZr is delta Molybdenum Boride-like structured and crystallizes in the monoclinic P2_1/m space group. The structure is three-dimensional. Zr is bonded in a 7-coordinate geometry to seven equivalent Cu atoms. There are a spread of Zr–Cu bond distances ranging from 2.76–2.95 Å. Cu is bonded in a 9-coordinate geometry to seven equivalent Zr and two equivalent Cu atoms. Both Cu–Cu bond lengths are 2.53 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ZrCu by Materials Project

CuZr crystallizes in the monoclinic Cm space group. The structure is three-dimensional. there are three inequivalent Zr sites. In the first Zr site, Zr is bonded in a 7-coordinate geometry to seven Cu atoms. There are a spread of Zr–Cu bond distances ranging from 2.68–2.99 Å. In the second Zr site, Zr is bonded in a 7-coordinate geometry to seven Cu atoms. There are a spread of Zr–Cu bond distances ranging from 2.71–2.88 Å. In the third Zr site, Zr is bonded in a 7-coordinate geometry to seven Cu atoms. There are a spread of Zr–Cu bond distances ranging from 2.76–2.91 Å. There are three inequivalent Cu sites. In the first Cu site, Cu is bonded in a 10-coordinate geometry to seven Zr and three Cu atoms. There are one shorter (2.62 Å) and two longer (2.66 Å) Cu–Cu bond lengths. In the second Cu site, Cu is bonded in a 10-coordinate geometry to seven Zr and three Cu atoms. Both Cu–Cu bond lengths are 2.58 Å. In the third Cu site, Cu is bonded in a 9-coordinate geometry to seven Zr and two Cu atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2025

Enhancing Dihydrogen Interaction of a Zirconium Metal–Organic Framework by Metal Doping

Advancing efficient hydrogen storage technologies is essential for enabling a sustainable energy future, especially in onboard applications. While hydrogen offers high gravimetric energy density and zero-emission combustion, its low volumetric energy density presents significant storage challenges. Metal-organic frameworks (MOFs), well known for their tunable porosity and high surface areas, have emerged as promising candidates for adsorption-based hydrogen storage. This study investigated a chemically robust zirconium-based MOF, MOF-808, as a representative platform for hydrogen storage enhancement through metal ion doping. Various divalent metal ions were introduced into MOF-808 via one-pot synthesis or post-synthetic modification (PSM) to evaluate their effects on metal doping efficiency, framework stability, and hydrogen adsorption performance. Our findings demonstrate that metal doping enhanced the hydrogen binding affinity of MOF-808 while preserving its structural integrity and excellent stability. A Mg-doped MOF, MOF-808@Mg 2:1, showed a 59% increase in hydrogen uptake, and a Cu-doped MOF, MOF-808-ZrCu, exhibited a 33% increase in isosteric heat of adsorption for H 2 compared to the pristine MOF-808 activated at the same temperature. This work highlights the potential of metal-functionalized stable MOFs for practical hydrogen storage applications. Furthermore, these materials are also being studied for their potential to enhance CO 2 adsorption.

Adsorption↗
NASA NTRS1990

Hydrocarbon-fuel/combustion-chamber-liner materials compatibility

Results of material compatibility experiments using hydrocarbon fuels in contact with copper-based combustion chamber liner materials are presented. Mil-Spec RP-1, n- dodecane, propane, and methane fuels were tested in contact with OFHC, NASA-Z, and ZrCu coppers. Two distinct test methods were employed. Static tests, in which copper coupons were exposed to fuel for long durations at constant temperature and pressure, provided compatibility data in a precisely controlled environment. Dynamic tests, using the Aerojet Carbothermal Test Facility, provided fuel and copper compatibility data under realistic booster engine service conditions. Tests were conducted using very pure grades of each fuel and fuels to which a contaminant, e.g., ethylene or methyl mercaptan, was added to define the role played by fuel impurities. Conclusions are reached as to degradation mechanisms and effects, methods for the elimination of these mechanisms, selection of copper alloy combustion chamber liners, and hydrocarbon fuel purchase specifications.

Gage, Mark L.↗
NASA NTRS1990

Corrosion Prevention in Copper Combustion Chamber Liners of Liquid Oxygen/Methane Booster Engines

Prior research conducted by United Technologies Research Center and Rockwell International Rocketdyne Division encountered severe copper corrosion while flowing hydrocarbon fuels through copper cooling tubes. These experimental results have very important implications for the development of low-cost, regeneratively cooled, oxygen/hydrocarbon bipropellant booster engines. Aerojet TechSystems undertook a program sponsored by NASA/Lewis Research Center in 1986 with two objectives: (1) to define the corrosive interaction process that occurs between hydrocarbon fuels and copper combustion chamber liner materials, using both static and dynamic test methods, and (2) to identify and demonstrate protective measures against this corrosive process. The results of the first program task demonstrated that the most damaging corrosive process was caused by trace amounts of sulfur-containing impurities in the hydrocarbon fuel which react with the copper chamber liner material to form cuprous sulfide (Cu2S), as reported in Paper No. AlAA 88-3215. Experiments were conducted which demonstrated this corrosive process with Mil-Spec RP-1, propane, and methane fuels in contact with OFHC, NASA-Z, and ZrCu coppers. The preliminary results of the second program task demonstrated that electrodeposited gold and platinum coatings held promise of preventing corrosion of copper chamber liners by methane contaminated with sulfur-containing impurities, as reported in Paper No. AIAA 89-2738. Experiments were conducted which demonstrated greatly reduced corrosion of copper by hydrogen sulfide (H2S) and methyl mercaptan (CH3SH) as measured impurities in methane. This paper presents the concluding, confirmatory results from the second program task. The efficacy of a protective gold coating on NASA-Z copper cooling channel walls was conclusively demonstrated. Tests were conducted in the Aerojet Carbothermal Test Facility which provide realistic simulations of booster engine cooling channel conditions such as temperature, pressure, flow velocity, and heat flux. Dynamic test series were performed with methane containing 5 and 10 ppm (by volume) hydrogen sulfide. Gold-plated and unplated copper alloy specimens were evaluated. The tests demonstrated that gold coatings were effective in preventing corrosion of the copper. Posttest metallographic examinations of the unplated specimens showed severe corrosion as a result of reaction with the sulfur containing contaminant in the fuel. In contrast, posttest metallographic examination of the gold-coated specimens showed no corrosion under similar operating conditions. The findings from metallurgical and chemical analyses of the copper specimens, chemical analysis of the methane, and description of all test conditions are provided. Conclusions are reached as to the efficacy of the plating methods and the effectiveness of the metal coatings in the prevention of corrosion in hydrocarbon-fueled booster engine combustion chamber liners.

S D Rosenberg↗