Characterization of Highly Waste Loaded Glass for HLW

1994 ◽  
Vol 353 ◽  
Author(s):  
Kazuhiro Kawamura ◽  
Jin Ohuchi
Keyword(s):  
Waste Glass ◽  
Apatite Crystal ◽  
Borosilicate Glasses ◽  
Good Thermal Stability ◽  
Leach Rate ◽  
Heat Treated ◽  
Simulated Waste ◽  
Temperature Transformation ◽  
Thermal Stability Of

AbstractPossibility of highly waste loaded borosilicate glasses up to 65wt% were investigated for HLW. In the case the waste was loaded at a content higher than 45wt%, apatite crystal was identified in the glasses. Adding above 2.5wt% of M0O3, yellow phase was observed in the 45wt% waste glass. In the case the composition of actual waste was simulated, waste(25–45wt%) glasses were characterized. Chemical durability of 45wt% waste glass was equivalent to that of 25wt% waste glass under the condition of Na20 content lower than 12wt%. Rheological behavior of 45wt% waste glass was equivalent to that of 25wt% waste glass in the range of melting temperature. Electrical resistivity of 45wt% waste glass were a little lower than that of 25wt% waste glass and it depended on the noble metal content. The Time-Temperature-Transformation (T-T-T) diagram and the leach rate of heat treated glass indicated a good thermal stability of highly waste loaded glass below the glass transition temperature. Possibility of high waste loading up to 45wt% was elucidated.

In situ characterization of foam morphology during melting of simulated waste glass using x-ray computed tomography

2020 ◽  
Vol 46 (11) ◽  
pp. 17176-17185 ◽  
Author(s):  
Steven A. Luksic ◽  
Richard Pokorny ◽  
Jaime George ◽  
Pavel Hrma ◽  
Tamas Varga ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Waste Glass ◽  
In Situ Characterization ◽  
X Ray ◽  
Foam Morphology ◽  
Simulated Waste ◽  
X Ray Computed

Synthesis and Characterization of Supramolecular Elastomers from Polyacids Composed of Vegetable Oils

2013 ◽  
Vol 747 ◽  
pp. 505-508 ◽  
Author(s):  
Ehsan Zeimaran ◽  
Sobhan Bahraeian ◽  
Taravat Ghanbari ◽  
Sara Pourshahrestani ◽  
Hussin Mohd Nor
Keyword(s):  
Thermal Stability ◽  
Structure Type ◽  
Good Thermal Stability ◽  
Thermogravimetric Analyzer ◽  
Fatty Amides ◽  
Amine Groups ◽  
Multiple Hydrogen Bonding ◽  
Synthesized Materials ◽  
Thermal Stability Of

Supramolecular elastomers were synthesized using vegetable oil materials namely palm acid oil (PAO) and sunflower oil (SFO). The oils were first epoxidized using formic acid and hydrogen peroxide. The epoxidized oils and adipic acid were then reacted to make polyacids, mainly triacid. Finally, diethylenetriamine (DETA) was added to polyacid to yield fatty amide and a polycondensation with urea performed to achieve the desired elastomers. The synthesized materials were characterized by using Fourier Transform Infrared (FTIR), Nuclear Magnetic Resonance (NMR) and Thermogravimetric Analyzer (TGA) in order to determine structure, type of bonding and thermal stability. The spectrums revealed that the synthesized fatty amides are contained amide groups that correctly formed from reaction of amine groups of DETA and acid functionality of polyacids. Moreover, the resulted structures showed the formation of multiple hydrogen-bonding in the elastomers. TGA thermograms clearly indicated good thermal stability of the elastomers to 500 °C.

scholarly journals Devitrification Behavior of SRL Defense Waste Glass

1983 ◽  
Vol 26 ◽  
Author(s):  
Dennis F. Bickford ◽  
Carol M. Jantzen
Keyword(s):  
Aluminum Content ◽  
Waste Glass ◽  
Minor Effect ◽  
Cooling Curves ◽  
Volume Percent ◽  
Similar Composition ◽  
Heat Treated ◽  
Temperature Transformation ◽  
Transformation Diagrams ◽  
Normal Processing

ABSTRACTSimulated SRL waste was prepared with compositions varying in iron and aluminum content. Two batches with similar composition were produced with different amounts of reducing agent added. Samples were isothermally heat treated and used to derive time-temperature-transformation diagrams. Supplementary samples were cooled in a manner programmed to simulate the cooling curves of production canisters. Less than 10% total devitrification occurs during normal processing. However, when waste glass 165 was purposely devitrified, un to 30 volume percent total spinel and acmite formed. Formation of these species had minor effect on leachability in MCC-1 and accelerated leach tests.

Surface Layer Formation on a Nuclear Waste Glass

1982 ◽  
Vol 15 ◽  
Author(s):  
Werner Lutze ◽  
GÜnter Malow ◽  
Harald Rabe ◽  
Thomas J. Headley
Keyword(s):  
Waste Glass ◽  
Layer Formation ◽  
Surface Layers ◽  
Protective Function ◽  
Leach Rate ◽  
Simulated Waste ◽  
Volcanic Glasses ◽  
The Stability ◽  
Kinetics Of ◽  
Surface Layer Formation

Surface layers are a common feature of leached surfaces of borosilicate waste glasses. Layers are also observed upon weathering of volcanic glasses[l] and of silicate minerals[2]. The question of whether these layers can protect the glass against further attack by decreasing the leach rate is stïll a subject of controversy[3]. Both in geochemical work[4] and in work on waste forms [5,6], surface layers are attributed a protective function, and the stability of leached, million years old volcanic glasses[1] may be due to the presence of palagonite, a thin (≤100 μm) alteration layer, which forms in a few years but does not seem to increase in thickness after this time. The present study investigates the effects of layer formation on leaching kinetics of a borosilicate waste glass containing 20 wt.% LWR-type simulated waste oxides.

The Development of Thermally Stable Sealing Glass in the BaO–B2O3–SiO2 System for Planar SOFC Applications

2008 ◽  
Vol 5 (3) ◽  
Author(s):  
Lian Peng ◽  
Qingshan Zhu
Keyword(s):  
Thermal Stability ◽  
Coefficient Of Thermal Expansion ◽  
Glass Network ◽  
Good Thermal Stability ◽  
Sealing Material ◽  
Heat Treated ◽  
Thermal Stability Of ◽  
Sealing Glass ◽  
B2o3 Glass

The purpose of the present paper is to study the influence of glass composition on the thermal stability in the SiO2–B2O3–BaO system, and three glasses were consequently investigated. Although Glass A has a coefficient of thermal expansion (CTE) that shows the best match with those of anode and electrolyte materials of solid oxide fuel cells (SOFCs), the thermal stability of Glass A is quite poor, where after being heat treated at 800°C for only 8h, the CTE of the glass increased more than 24%. The change of the CTE value was mainly attributed to the fast crystallization that formed high CTE value phases such as BaB2O4 and Ba2Si3O8. In order to improve the thermal stability, BaO in Glass A was replaced by B2O3 (Glass B) and SiO2 (Glass C). It was found that the decrease in the BaO content improved the thermal stability of the resultant glasses. Glass B showed less than 8% change of the CTE during annealing time at 800°C, while Glass C exhibited superior long-term thermal stability, where the change of the CTE was within the equipment detection limit after being heat treated for 300h at 800°C. The good thermal stability of Glass C was believed to be due to the formation of a more compact glass network after the substitution as compared with that of Glass A. The good thermal stability makes Glass C attractive to be used as the sealing material for SOFC applications.

Study of the Adhesion and the Thermal Stability of CrN and CrAlN Thin Films

2011 ◽  
Vol 227 ◽  
pp. 168-172
Author(s):  
Fatima Zohra Mammeri ◽  
Lounis Chekour ◽  
Nadjet Rouag
Keyword(s):  
Thermal Stability ◽  
Vapour Deposition ◽  
Annealing Temperature ◽  
Morphological Characterization ◽  
Thin Layers ◽  
Good Thermal Stability ◽  
Physical Chemical ◽  
Thermal Stability Of ◽  
Lower Adherence

The chromium nitride thin layers have became more and more popular in the last decade because of their good physical, chemical and mechanical properties. The present study deals the morphological characterization of hard Cr-N and CrAlN thin layers deposited on silicon (100) substrates by physical vapour deposition (PVD). The effect of the annealing temperature on the adherence and the thermal stability of CrN layers are considered. SEM observations and EDS microanalyses were performed. Cr-N films, 1μm thick, were annealed for 1 hour at 600 to 1000°C under flux of nitrogen. These layers presented a good thermal stability at low temperatures. Moreover SEM observations showed that the CrN films had a low adhesion at high temperatures. In addition, after annealing at 700°C for 4 hours, CrAlN coating of 1μm thickness presents a better thermal stability than CrN coating but with lower adherence. The results given by SEM-EDS and XRD are compared.

Raman studies of technetium in borosilicate waste glass

2007 ◽  
Vol 95 (5) ◽  
Author(s):  
David A. McKeown ◽  
Andrew C. Buechele ◽  
Wayne W. Lukens ◽  
D. K. Shuh ◽  
Ian L. Pegg
Keyword(s):  
Raman Spectroscopy ◽  
Waste Glass ◽  
Borosilicate Glasses ◽  
Coordination Environment ◽  
X Ray ◽  
Waste Vitrification ◽  
X Ray Absorption ◽  
Raman Spectral

The characterization of technetium (Tc) environments in borosilicate glasses is important with regard to the long-term isolation of Tc in nuclear wastes from the environment by waste vitrification. In this study, Raman spectroscopy was used to detect Tc in various borosilicate waste glass formulations in which Tc valence and average coordination environment were previously characterized by X-ray absorption spectroscopy. Raman spectral comparisons between chemically equivalent Tc-containing and Tc-free borosilicate glass pairs indicate Tc-dependent features near 320 and 910 cm

REPUBLIC HP 9-4-30

Alloy Digest ◽  
1972 ◽  
Vol 21 (7) ◽  
Keyword(s):  
Thermal Stability ◽  
Fracture Toughness ◽  
Heat Treating ◽  
Good Thermal Stability ◽  
Treated Condition ◽  
Heat Treated ◽  
Long Time ◽  
Heat Treated Condition ◽  
Thermal Stability Of ◽  
Minimum Yield

Abstract REPUBLIC HP 9-4-30 is a heat-treated alloy steel capable of developing minimum yield strengths up to 190,000 psi with superior toughness characteristics. It is designed for sheet, plate, and forging applications, and can be welded in the heat-treated condition. The good thermal stability of this alloy makes it attractive for applications requiring long-time exposures at temperatures up to 700 F. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness, creep, and fatigue. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SA-278. Producer or source: Republic Steel Corporation.

Synthesis and Characterization of Multi-Functional Substituted POSS

2012 ◽  
Vol 554-556 ◽  
pp. 227-230
Author(s):  
Li Ying Zhang ◽  
Xiao Jing Zhao ◽  
Ping Chen ◽  
Sheng Di Fan
Keyword(s):  
Thermal Stability ◽  
Nuclear Magnetic Resonance ◽  
Synthesis And Characterization ◽  
Wide Angle ◽  
X Ray Diffraction ◽  
X Ray ◽  
Good Thermal Stability ◽  
Elementary Analysis ◽  
Thermal Stability Of

Five different multifunctional nitro octaphenyl silsesquioxane (NPS) were Synthesised and reduction was carried out to obtain amino octaphenyl silsesquioxane(APS). These compounds were characterized with elementary analysis, fourier transform infrared(FTIR), nuclear magnetic resonance (NMR, 29Si), wide-angle X-ray diffraction(XRD) and thermogravimetry (TG). Experiental results showed that the longer the nitration time, the more nitro connected to the OPS, but not positively, nitro number remained unchanged after five hours. NPS has good thermal stability than corresponding APS under 450°C, and the thermal stability of APS are decrease with the increase of amino number.

Effect of Preparation Method on Film Structure and Thermal Stability of Me/MeN/Me (Me = Al, Ti) Multilayer Thin Films

2012 ◽  
Vol 465 ◽  
pp. 283-286
Author(s):  
Zhang Lian Hong ◽  
Jian Feng Xu ◽  
Shi Feng Zhou ◽  
Zhong Long ◽  
Hong Xiao ◽  
...  
Keyword(s):  
Thin Films ◽  
Thermal Stability ◽  
Film Structure ◽  
Silicon Substrates ◽  
Multilayer Thin Films ◽  
Good Thermal Stability ◽  
Heat Treated ◽  
Plating Method ◽  
Auger Electron Spectra ◽  
Thermal Stability Of

Me/MeN/Me (Me=Al, Ti ) multilayer thin films were deposited on silicon substrates by a multi-arc ion plating method (MAIP) and successive magnetron sputtering method (MS) respectively. The as-prepared and heat-treated films were characterized by scanning electron microscope (SEM) and auger electron spectra (AES). The results revealed that MS method has an advantage over MAIP method to prepare the Al/AlN/Ti submicron thin films which have high density, clear interface and smooth surface. In addition, the present study indicated that both the deposition sequence and mid-layer composition have a significant effect on the thermal stability. After heat-treatment at 500 oC for 10 min, the Al/AlN/Ti multilayer film prepared by the MS method has good thermal stability without surface crack or surface flaking. Furthermore, significant diffusion of oxygen element and nitrogen element within the multilayer interface was observed by the AES measurement. It is believed that the element diffusion in the multilayer interface plays an important role in the binding strength of multilayer interface.

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