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Oxidation behavior of iron-chromium alloys at elevated temperatures: A reactive-element effect

Description: Oxidation tests were conducted on samples of Fe-25Cr, Fe-25Cr,-0.3-1.0Y, and Fe-25Cr-1Ce at temperatures of 700 to 1000{degrees}C and oxygen partial pressures of 1 to 20 atm for time periods of 19 to 160 h. In some tests, oxidized samples were quenched from test temperature to room temperature in {approximately}20 min to examine characteristics of the spallation scales. The results showed that the scales, even though of the same composition, spalled totally when developed on Fe-25Cr alloy, whil… more
Date: March 1, 1992
Creator: Park, J. H. & Natesan, K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Novel concept development of an internal recirculation catalyst for mild gasification

Description: The objective of this program is to provide an overall evaluation of a novel process concept for mild gasification by completing work in three major tasks: (1) Laboratory-Scale Experiments, (2) Bench-Scale Tests, and (3) Proof-of-Concept Tests and Evaluation (optional). During this quarter, experimental work involving potential recirculating catalysts for coal, initiated in the previous quarter, was continued. The construction and shakedown of an all quartz laboratory-scale isothermal free-fall… more
Date: October 1, 1988
Creator: Knight, R. A.; Babu, S. P.; Martin, K. A. & Chao, S. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A Novel Coal Feeder for Production of Low Sulfur Fuel

Description: A dual-screw feeder was designed and tested for desulfurization of coal. The key parts of this reactor are two screw tubes which independently feed coal and calcined lime, the inner tube acting as a coal pyrolizer and the outer tube acting as a desulfurizer with hot calcined lime pellets or other renewable sorbent pellets. The objective of this project is to study the feasibility of this advanced concept of desulfurization using the coal feeder. In this quarter, the following tasks have been pe… more
Date: January 1, 1992
Creator: Khang, S. J.; Keener, T. & Lin, L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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275 C Downhole Switched-Mode Power Supply

Description: A vee-square (V2) control based controller IC is developed for a switch mode power supply capable of operating at extreme temperature/harsh environment conditions. A buck type regulator with silicon carbide power junction field effect transistors (JFET) as power devices is used to analyze the performance of controller. Special emphases are made on the analog sub-blocks--voltage reference, operational transconductance amplifier and comparator as individual building blocks. Transformer coupled ga… more
Date: August 31, 2008
Creator: Hutchens, Chris & Madhuravasal, Vijay
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Oxidation of spent fuel in air at 175 degree to 195 degree C

Description: Oxidation tests in dry air were conducted on four LWR spent fuels at 175{degrees} and 195{degrees}C to determine the effect of the fuel characteristics on the oxidation state likely to exist at the time leaching occurs in a potential repository. Weight changes were measured and samples were examined by XRD, ceramography, TEM, and TGA. Despite local variations in the grain boundary susceptibility to oxidation, all four fuels progressed toward an apparent endpoint at an oxygen-to-metal (O/M) rati… more
Date: April 1, 1992
Creator: Einziger, R. E.; Buchanan, H. C.; Thomas, L. E. (Pacific Northwest Lab., Richland, WA (United States)) & Stout, R. B. (Lawrence Livermore National Lab., CA (United States))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Robotic weld overlay coatings for erosion control

Description: Twelve weld overlay hardfacing alloys have been selected for preliminary erosion testing based on a literature review These alloys have been separated into three major groups: (1) Cobalt containing alloys, (2) Nickel-base alloys, (3) Iron base alloys. These alloys are being applied to carbon steel substrates and will undergo preliminary erosion testing to identify candidates weld overlay alloys for erosion control in CFB boilers. The candidate alloys selected from the preliminary erosion tests … more
Date: April 18, 1993
Creator: Levin, B. F.; Dupont, J. N. & Marder, A. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Inelastic deformation and damage at high temperature

Description: Combined experimental and theoretical investigations into the inelastic deformation and damage behavior of engineering alloys at elevated temperatures are being pursued. The analysis of previously performed strain rate change and relaxation tests on modified 9Cr-1Mo steel showed the need for inclusion of a recovery of state term in the growth laws for the state variables of the viscoplasticity theory based on overstress (VBO). Recovery of state terms were introduced and the experimental results… more
Date: January 1, 1992
Creator: Krempl, E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Conversion of ethane and of propane to higher olefin hydrocarbons

Description: Initial work on this project has shown that it is possible to convert ethane and propane in the presence of steam and oxygen over a catalyst comprising calcium-nickel-potassium oxide to both lower and higher hydrocarbons at temperatures in the range of 300--600{degree}C. Major amounts of CO{sub 2} are formed at the higher temperatures and conversions are relatively low at the lower temperatures. However, there are indications that the objective of preparing C{sub 6} to C{sub 12} olefins may be … more
Date: December 1, 1991
Creator: Heinemann, H. & Somorjai, G.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Depletion and recovery behavior of the Gladys McCall geopressured geothermal reservoir

Description: Many sedimentary basins throughout the world contain sealed fault blocks in which the pore fluids are at higher pressures and temperatures than normal as a consequence of their depositional environment. The U.S. Department of Energy has drilled, completed, and tested four deep research wells in selected geopressured geothermal prospects in the Texas-Louisiana Gulf Coast region to evaluate the recoverability of the thermal, hydraulic, and chemical (methane) energy in this potential energy resour… more
Date: June 1, 1990
Creator: Riney, T.D. (S-CUBED, La Jolla, CA (USA))
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Process and analytical studies of enhanced low severity co-processing using selective coal pretreatment

Description: The objectives of the project are to investigate various coal pretreatment techniques and to determine the effect of these pretreatment procedures on the reactivity of the coal. Reactivity enhancement will be evaluated under both direct hydroliquefaction and co-processing conditions. Coal conversion utilizing low rank coals and low severity conditions (reaction temperatures generally less than 350{degrees}C) are the primary focus of the liquefaction experiments, as it is expected that the effec… more
Date: 1990-06~
Creator: Baldwin, R. M. & Miller, R. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The dynamics of adsorption on clean and adsorbate-modified transition metal surfaces

Description: Research is being carried out on both nondissociative and dissociative adsorption of gases on transition metal surfaces, with emphasis on alkanes. Particular attention is be placed on understanding the effects of adsorbed species on adsorption probabilities and on clarifying the role of energy exchange processes at the surface in both dissociative and nondissociative adsorption. Molecular beam methods are coupled with methods of surface science to gain the greatest control of the variables of t… more
Date: June 1, 1991
Creator: Madix, R.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Conversion of ethane and of propane to higher olefin hydrocarbons

Description: It has become apparent during the past few months that results obtained in the oxidative coupling of methane cannot be extended to ethane and propane. Good selectivities and yields for the oxydehydrogenation to olefins can be obtained but production of higher hydrocarbons is small. The present report summarizes results of experiments using zeolite based catalysts and compares these with basic oxide catalysts. The oxydehydrogenation of ethane over zeolite based catalysts (H[sup [minus plus]] Na[… more
Date: September 1, 1992
Creator: Heinemann, H. & Somorjai, G.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Conversion of ethane and of propane to higher olefin hydrocarbons

Description: Purely thermal reactions for the conversion of ethane were carried out in an empty and in a quartz chip filled reactor over a temperature range of 300--800{degrees}C in the absence and presence of oxygen and oxygen plus water. Ethane alone shows no conversion below 600{degrees}C and some conversion to CH{sub 4} and very little C{sub 2}H{sub 4} at 700{degrees} and 800{degrees}C. Ethane and oxygen produce CO{sub 2} as the major product above 400{degrees}C. The additional presence of water does no… more
Date: October 1, 1991
Creator: Heinemann, H. & Somorjai, G.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The thermal decomposition of methane in a tubular reactor

Description: The reaction rate of methane decomposition using a tubular reactor having a 1 inch inside diameter with an 8 foot long heated zone was investigated in the temperature range of 700 to 900 C with pressures ranging from 28.2 to 56.1 atm. Representing the rate by a conventional model, {minus}dC{sub CH4}/dt= k1 C{sub CH4} {minus}k2 C{sub H2}{sup 2}, the rate constant k1 for methane decomposition was determined. The activation energy, 31.3 kcal/mol, calculated by an Arrhenius Plot was lower than for … more
Date: January 1, 1992
Creator: Kobayashi, Atsushi & Steinberg, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Orientational phase transitions in alloys. [CsPb; NaSn]

Description: Plastic crystal behavior is observed in semiconducting CsPb and NaSn at high temperature (600 and 500 C, respectively). This behavior is associated with M{sub 4}{sup 4{minus}} or A{sub 4}M{sub 4} structural units orientationally disordering about 50 C below the melting point where translational disorder sets in. This orientational disorder is different in the two phases, exhibiting jump reorientations in CsPb and a more isotropic behavior in NaSn. In other Zintl compounds such as KPb, there is … more
Date: September 22, 1992
Creator: Saboungi, M.L.; Johnson, G.K. & Price, D.L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Development of an experimental data base and theories for prediction of thermodynamic properties of aqueous electrolytes and nonelectrolytes of geochemical significance at supercritical temperatures and pressures

Description: This project is divided into method experimental measurements, theoretical development, and geochemical applications. We have completed experimental volumetric measurements on aqueous solutions of CO{sub 2} H{sub 2}S, CH{sub 4}, NH{sub 3} and B(OH){sub 3} at 25 to 432{degree}C and 280 and 350 bar. A vibrating tube densitometer that allows density measurements near bubble point and also measures the bubble pressure was developed and used to measure densities and bubble pressures of aqueous Co{su… more
Date: February 24, 1992
Creator: Wood, R.H.; Hnedkovsky, L.; Lin, Ching Lung (Delaware Univ., Newark, DE (United States). Dept. of Chemistry and Biochemistry) & Shock, E.L. (Washington Univ., St. Louis, MO (United States). Dept. of Earth and Planetary Sciences)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Direct determination of organic and inorganic sulfur in coal by controlled oxidation

Description: The overall objective of this project is to develop an analytical method to directly measure the forms of organic sulfur in coal. The method will provide a route to monitor the effectiveness of coal preparation research directed toward removal of organic sulfur in coal. The approach involves subjecting diluted coal samples simultaneously to an oxygen flow and a linear increase in temperature. Distinctive sulfur dioxide evolution patterns are observed among coals of different rank and between ra… more
Date: January 1, 1992
Creator: LaCount, R.B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Temperature and ion-mass dependence of amorphization dose for ion beam irradiated zircon (ZrSiO[sub 4])

Description: The temperature dependence of amorphization dose for zircon under 1.5 MeV Kr ion irradiation has been investigated using the ANL HVEM-Tandem Facility. Three regimes were observed in the amorphization dose-temperature curve. In the first regime (15 to 300 K), the critical amorphization dose increased from 3.06 to 4.5 ions/nm[sup 2]. In the second regime (300 to 473 K), there is little change in the amorphizationdose. In the third regime (> 473 K), the amorphization dose increased exponentially t… more
Date: December 1, 1992
Creator: Wang, L. M.; Ewing, R. C.; Weber, W. J. & Eby, R. K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Performance of HT9 clad metallic fuel at high temperature

Description: Steady-state testing of HT9 clad metallic fuel at high temperatures was initiated in EBR-II in November of 1987. At that time U-10 wt. % Zr fuel clad with the low-swelling ferritic/martensitic alloy HT9 was being considered as driver fuel options for both EBR-II and FFTF. The objective of the X447 test described here was to determine the lifetime of HT9 cladding when operated with metallic fuel at beginning of life inside wall temperatures approaching [approximately]660[degree]C. Though stress-… more
Date: January 1, 1992
Creator: Pahl, R.G.; Lahm, C.E. & Hayes, S.L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Requirements for design of Class 1 elevated temperature nuclear system components (supplement to ASME Code Case N-47)

Description: This standard provides rules for the design of Class 1 nuclear components for use at elevated temperatures. It constitutes a complete set of requirements only when used in conjunction with Section III of the ASME Boiler and Pressure Vessel Code (ASME Code) and addenda, and ASME Code Case N-47. Unmodified portions of Code Case N-47 are not repeated in this standard but are considered requirements of this standard.
Date: June 1, 1986
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Reaction of porous beryllium in steam

Description: This report presents the findings of some additional investigations into the reaction of beryllium of approximately 88% theoretical density with steam. An earlier investigation had shown this material to be extremely reactive compared to dense beryllium. Inductively heated samples developed self-sustaining reactions due to the exothermic heat of reaction at temperatures between 600[degrees]C and 700[degrees]C. These initial tests did not completely explain the mechanisms causing this behavior. … more
Date: July 1, 1992
Creator: Smolik, G. R.; Merrill, B. J. & Wallace, R. S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Synergistic Effects of Silver Films and Synthetic Lubricants on Boundary-Lubrication Behavior of Ceramics

Description: In a study seeking to achieve low friction and low wear on ceramic materials, we investigated a new lubrication concept that explores the synergistic effect of a silver film and a recently developed synthetic oil on the boundary lubrication behavior of silicon nitride (Si[sub 3]N[sub 4]) ceramics. Friction and wear tests were performed on a wear test machine at temperatures up to 380[degree]C. Under the test conditions explored, we found that the friction coefficients of Si[sub 3]N[sub 4]/Si[su… more
Date: November 1, 1992
Creator: Erdemir, A.; Ajayi, O. O.; Erck, R. A.; Fenske, G. R.; Nichols, F. A.; Ockers, J. M. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The role of grain boundary chemistry and structure in the environmentally-assisted intergranular cracking of nickel-base alloys

Description: Stress corrosion cracking tests in constant extension rate tensile (CERT) and constant load tensile (CLT) tests were conducted on Ni-xCr- 9Fe-yC in Ar, water, and a LiOH-boric acid solution. Cr and C improve the resistance of Ni-base alloys to IG cracking in both Ar and water at 360C. Since creep plays a role in IG cracking, one possible explanation for the role of the environment involves its effect on the creep. Experiments were conducted on the role of C in the deformation behavior and failu… more
Date: July 1, 1992
Creator: Was, G.S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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