106 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Boron Oxides"  
Results: 1 - 24 next
open access

Chemical Processing Technology Quarterly Progress Report, January-March 1961

Description: Studies are reported on aqueous zirconium processing, dissolution of BeO- UO/sub 2/ ceramic fuel, the aqueous stainless steel process, the behavior of dibutyl phosphates, use of boron (boric acid) solution to assure critical safety, fluidized bed calcination, conversion of amorphous alumina to alpha alumina, the Demonstrational Waste Calcining Facility, removal of long-lived radioisotopes from waste solutions, separation of iron, nickel, and chromiun from stainless steel waste solutions, electr… more
Date: October 31, 1962
Creator: Bower, J. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Development of glass formulations containing high-level nuclear wastes

Description: The effects of Na/sub 2/O, K/sub 2/O, B/sub 2/O/sub 3/, TiO/sub 2/, CaO, and ZnO contents were determined on the leach rate and homogeneity of a potential high-level waste glass. It was found that the two characteristics are in competition, with variations of CaO having the greatest effect and TiO/sub 2/ having the least effect. Boron oxide content is important in control of Na/sub 2/MoO/sub 4/ formation and separation. Sodium molybdate formation can also be controlled by the use of reducing ag… more
Date: February 1, 1978
Creator: Ross, W.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Phase Transformations in Alumina. Technical Report, May to December 1961

Description: e transformation studies showed that synthetic aluminas produced in the laboratory were not transformed to alpha alumina at 400 to 700' deg n the presence of nitric acid and water vapor. Amorphous aluminn produced in the pilot plant was transformed to alpha alumina. This indicated that the amorphous alumina produced in the pilot plant is structurally predisposed to form alpha alumina. Most additives did not appear to have any special effects. Lithium formed zeta alumina, LiAl/sub 5/O/sub 8/. Ph… more
Date: December 1, 1961
Creator: Eding, H J; Huggins, M L & Brown, A G
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Chemical Processing Technology Quarterly Progress Report, October-December 1961

Description: The ICPP processed Al fuel, prtncipally of the MTR-ETR type, durtng this quarter. Newly designed and installed processing equipment exhibited excellent operating performance. This included direct-air-pulsed extraction, stripping and scrub columns, and a cascade-controlled continuous evaporator in first cycle product concentration service. Aqueous zirconium fuel processing studies continued with the objective of adapting the hydrofluoric acid process to continuous dissolution-complexing to incre… more
Date: March 28, 1962
Creator: Bower, J. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

DETERMINATIONS OF THE KINETICS AND MECHANISMS OF DEBORONIZATION AT 1135 C

Description: The mechanisms and kinetics of the loss of boron during heating at 1135 deg C under various dynamic environments were determined from powder compacts of 5 wt% elemental boron dispersed in matrices of Fe, Cr, Ni, Si, Fe/sub 2/O/sub 3/, Cr/sub 2/O/sub 3/, NiO, and SiO/sub 2/, compacts of austenitic stainless steel alloy powder containing 0.25 wt% boron, and wrought specimens of 0.13 wt% boron-- stainless steel alloy. The compacts containing 5 wt% boron were heat treated in vacuum, highpurity argo… more
Date: September 15, 1961
Creator: Cherubini, J.H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Trace Metal Speciation in Saline Waters Affected by Geothermal Brines. [GEOCHEM]

Description: A description is given of the chemical equilibrium computer program GEOCHEM, which has been developed to calculate trace element speciation in soil, irrigation, drainage, or Salton Sea waters affected by geothermal brine. GEOCHEM is applied to irrigation water-brine mixtures and to Salton Sea water-brine mixtures in order to compute the chemical speciation of the elements Cd, Cu, Hg, Ni, Pb, and Zn, along with the oxyanions of As and B. The results suggest that the computer simulation can have … more
Date: November 1, 1977
Creator: Sposito, G. & Page, A. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

THE CONTINUOUS MONITORING OF BORIC ACID CONCENTRATION BY NEUTRON ABSORPTIOMETRY

Description: A neutron absorption cell was built to monttor continuously the boric actd concentration of reactor water flowing through a purtfication loop. The instrument was calibrated over the range from 0 to 2.65 g/l with a maxtmum absolute error of 0.05 g/-l. (auth)
Date: October 1, 1961
Creator: Armani, R.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Inelastic scattering from amorphous solids

Description: The potential of inelastic neutron scattering techniques for surveying various aspects of the dynamics of amorphous solids is briefly reviewed. The recent use of the Intense Pulsed Neutron Source to provide detailed information on the optical vibrations of glasses is discussed in more detail. The density of states represents an averaged quantity which gives information about the general characteristics of the structure and bonding. More extensive information can be obtained by studying the deta… more
Date: August 1, 1985
Creator: Price, D.L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Low-frequency nuclear quadrupole resonance with a dc SQUID

Description: Conventional pure nuclear quadrupole resonance (NQR) is a technique well suited for the study of very large quadrupolar interactions. Numerous nuclear magnetic resonance (NMR) techniques have been developed for the study of smaller quadrupolar interactions. However, there are many nuclei which have quadrupolar interactions of intermediate strength. Quadrupolar interactions in this region have traditionally been difficult or unfeasible to detect. This work describes the development and applicati… more
Date: July 1, 1991
Creator: Chang, J.W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Optimization of glass composition for the vitrification of nuclear waste at the Savannah River Plant

Description: Waste glasses of different compositions were compared in terms of leachability, viscosity, liquidus temperature, and coefficient of expansion. The compositions of the glasses were determined by statistical optimization. Waste glass of the optimized composition is more durable than the current reference composition but can still be processed at low temperature.
Date: January 1, 1982
Creator: Soper, P. D.; Roberts, G. J.; Lightner, L. F.; Walker, D. D. & Plodinec, M. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Role of structure in ion movement of glasses

Description: Can the structure of a melt much above the glass transition temperature (Tg) determine the structure and (transport) properties of glass In other words, are there extremely long lasting configurations in a melt which would affect ion transport in the glassy state A major effort during the past year has been to address these very fundamental questions. An important consideration here is to separate the effect of the variable melt structure from that of a variable cooling rate in the glass transf… more
Date: January 15, 1992
Creator: Jain, Himanshu
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Effects of composition on properties in an 11-component nuclear waste glass system

Description: Ninety simplified nuclear waste glass compositions within an 11-component oxide composition matrix were tested for crystallinity, viscosity, volatility, and chemical durability. Empirical models of property response as a function of glass composition were developed using statistical experimental design and modeling techniques. A new statistical technique was developed to calculate the effects of oxide components on each property. Independent melts were used to check the prediction accuracy of t… more
Date: September 1, 1981
Creator: Chick, L. A.; Piepel, G. F.; Mellinger, G. B.; May, R. P.; Gray, W. J. & Buckwalter, C. Q.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Development of glass compositions for immobilization of Savannah River Plant waste

Description: Two fundamental problems related to processing Savannah River Plant wastes are the formation of ferrite-spinel crystals during melting, and the high viscosity and ready devitrification of high aluminum sludge-melts. The effects of several glass composition variables on these processing problems have been investigated. The most important variables are the TiO/sub 2/ content, the molar alkali-to-silica ratio, and the molar ratio of Li/sub 2/O to total alkali. As the TiO/sub 2/ content decreases, … more
Date: January 1, 1978
Creator: Plodinec, M.J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A study of potential high band-gap photovoltaic materials for a two step photon intermediate technique in fission energy conversion

Description: A diamond synthesis chamber and an ion implanter have been constructed. Work has been rapidly progressing and diamond has been synthesized. There are five variables which affect the quality of diamond: (1) mass flow of methane, (2) mass flow of hydrogen, (3) filament temperature, (4) substrate temperature, and (5) substrate material. Enclosed are pictures and data of previous diamond growth experiments. Current work is focused on the conditions which produce the best quality diamond films. In t… more
Date: August 16, 1991
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

First-order model for durability of Hanford waste glasses as a function of composition

Description: Two standard chemical durability tests, the static leach test MCC-1 and product consistency test PCT, were conducted on simulated borosilicate glasses that encompass the expected range of compositions to be produced in the Hanford Waste Vitrification Plant (HWVP). A first-order empirical model was fitted to the data from each test method. The results indicate that glass durability is increased by addition of Al{sub 2}O{sub 3}, moderately increased by addition of ZrO{sub 2} and SiO{sub 2}, and d… more
Date: April 1, 1992
Creator: Hrma, P.; Piepel, G. F.; Schweiger, M. J. & Smith, D. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

SiO sub 2 Membranes for H sub 2 Separation in Coal Gas Processing

Description: The project objectives are (1) to synthesize permselective ceramic membranes by chemical vapor deposition of SiO{sub 2} and other oxides within the walls of porous support tubes, (2) measure membrane permeability and thermal stability to various gases at 200--700{degrees}C and (3) develop a mathematical model for the chemical vapor deposition of the permselective oxide within the porous support tube.
Date: January 1, 1990
Creator: Gavalas, G. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Method of inspecting Raschig rings by neutron absorption counting

Description: A neutron counting method for inspecting borosilicate glass Raschig rings and an apparatus designed specifically for this method are discussed. The neutron count ratios for rings of a given thickness show a linear correlation to the boron oxide content of the rings. The count ratio also has a linear relationship to the thickness of rings of a given boron oxide content. Consequently, the experimentally-determined count ratio and physically-measured thickness of Raschig rings can be used to stati… more
Date: July 27, 1979
Creator: Morris, R.N.; Murri, R.L. & Hume, M.W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Development of glass compositions for immobilization of SRP waste

Description: An improved composition of glass frit, termed 411, was developed for the immobilization of SRP high-level radioactive waste. In comparison with frit compositions previously studied, the new composition offers the following advantages: the amount of ferrite-spinel crystals formed is greatly decreased because the TiO/sub 2/ content is much lower; a higher lithium-to-sodium ratio decreases the viscosity of glass mixtures containing high-aluminum waste. The compositional studies leading to the deve… more
Date: February 1, 1979
Creator: Plodinec, M.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Relationship between borosilicate glass composition, structure, and durability test response (SRS)

Description: The chemical durability of 30 glasses from the Na[sub 2]O [center dot] B[sub 2]O[sub 3] [center dot] SiO[sub 2] [center dot] Al[sub 2]O[sub 3] [center dot] Fe[sub 2]O[sub 3][center dot]CaO system was examined. Two standard leach tests, MCC-1P and PCT, were performed in unbuffered, deionized water. PCT tests were performed for durations up to twenty-four weeks to obtain glass dissolution rate data. Short-term MCC-1P test leachate solutions are determined by the glass composition. Long-term glass… more
Date: January 1, 1992
Creator: Ramsey, W. G.; Jantzen, Carol M. & Taylor, T. D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Microwave sintering of titanium diboride

Description: Titanium diboride was heated to high temperatures using microwaves. The highest temperature obtained was 2245/degree/C. Unfortunately, oxidation was a problem, especially at the higher temperatures, although an argon flush and a carbon getter were used. To completely stop oxidation, the oxygen potential must be below 10/sup /minus/18/ atmospheres. Using an argon flush and a carbon getter, titanium diboride was successfully densified to 82% of theoretical without measurable oxidation by heating … more
Date: January 1, 1989
Creator: Katz, J. D.; Blake, R. D. & Scherer, C. P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Effect of composition and temperature on viscosity and electrical conductivity of borosilicate glasses for Hanford nuclear waste immobilization

Description: Viscosity and electrical conductivity of 79 simulated borosilicate glasses in the expected range of compositions to be produced in the Hanford Waste Vitrification Plant were measured within the temperature span from 950 to 1250[degree]C. The nine major oxide components were SiO[sub 2], B[sub 2]O[sub 3], Li[sub 2]O, Na[sub 2]O, CaO, MgO, Fe[sub 2]O[sub 3], Al[sub 2]O[sub 3], and ZrO[sub 2]. The test compositions were generated statistically. The data were fitted by Fulcher and Arrhenius equation… more
Date: April 1, 1993
Creator: Hrma, P.; Piepel, G. F.; Smith, D. E.; Redgate, P. E. & Schweiger, M. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

SiO2 Membranes for H2 Separation in Coal Gas Processing. Quarterly Progress Report, March 1, 1990--May 31, 1990

Description: The project objectives are (1) to synthesize permselective ceramic membranes by chemical vapor deposition of SiO{sub 2} and other oxides within the walls of porous support tubes, (2) measure membrane permeability and thermal stability to various gases at 200--700{degrees}C and (3) develop a mathematical model for the chemical vapor deposition of the permselective oxide within the porous support tube.
Date: December 31, 1990
Creator: Gavalas, G. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Manufacturing tailored property ceramic composites

Description: Composite materials are desirable for many advanced engineering applications where the properties of a single phase material cannot meet all of the service requirements; however, existing process technology has limited the development and commercialization of composites. Lack of reproducible sintering to high density is one of the major obstacles to commercializing ceramic composites. Final-stage, non-reactive liquid phase sintering (NLPS) theory provides metrics for sinterability that can be u… more
Date: November 14, 1994
Creator: Ewsuk, K. G. & Harrison, L. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Friction of self-lubricating surfaces by ion beam techniques. Final technical report

Description: UES, Inc. conducted a research and development program designed to establish conditions for ion implantation/mixing of suitable additives into the surfaces of bulk ceramics and metals for obtaining self-lubricating low friction and wear characteristics. The substrates considered were ZrO{sub 2}, Al{sub 2}O{sub 3}, Si{sub 3}N{sub 4}, steel and Ni-base superalloy. The lubricant additives chosen were BaF{sub 2}/CaF{sub 2}Ag, MoS{sub 2}, WS{sub 2}and B{sub 2}O{sub 3}. The initial tasks of the progr… more
Date: May 1, 1992
Creator: Bhattacharya, R. S. & Rai, A. K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen