Density, thermal expansion coefficient and viscosity of sodium tetraborate (borax)-UO2 and of sodium metaborate-UO2 solutions at high temperatures

Donne, M. Dalle; Dorner, S.; Roth, A. P.

doi:10.1016/0022-3115(83)90225-8

Cited by 6 publications

(4 citation statements)

References 2 publications

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“…How the stresses are redistributed will depend on the porosity morphology. Second, any pores that contain cracks may contribute to the crack length, decreasing the amount of stress required to cause failure as shown in Equation (11).…”

Section: Ch 6: Results and Discussionmentioning

confidence: 99%

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Crush Strength Analysis of Hollow Glass Microspheres

Dillinger

Clark

Suchicital

et al. 2018

Ceramic Engineering and Science Proceedings

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Porous Wall Hollow Glass Microspheres (PWHGMs) were developed by the Savannah River National Laboratory. What makes these microspheres unique is the interconnected porosity spread throughout their wall allowing various materials to travel from the surface to the hollow interior. With their characteristic porosity, the PWHGMs are a great tool for encapsulating or filtrating different materials. Unfortunately, there is little information available on the mechanical properties of PWHGMs. The main goal of this research was to develop a method to crush individual microspheres and statistically analyze the results. One objective towards completing this goal was to measure the microsphere diameter distribution. Microsphere diameter is a major factor affecting strength as well as the Weibull parameters. Two different methods, microscopy counting and laser light scattering, used in the research yielded similar distributions. The main objective of this research was to analyze the crush strength of individual microspheres. Using nanoindentation, data were collected to analyze the crush strength of PWHGMs in uniaxial compression. Nanoindentation data were used to analyze how the strength of the PWHGMs changes through the different stages of production and at different diameter ranges. Data for 3M commercial microspheres were compared to ARC microspheres. Most data were analyzed using a statistical technique known as the two parameter Weibull analysis. The data indicated that the strength generally decreased as the microsphere diameter increased. Scattering in the data was nearly the same across all sample sets tested. Results indicated that the PWHGMs were weaker than the ARC hollow glass microspheres (HGMs). This is primarily due to the addition of wall porosity in the PWHGM.

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Section: Ch 6: Results and Discussionmentioning

confidence: 99%

“…Heat treating the glass will also relieve internal stresses produced during production. The difference in the thermal expansion coefficients between the two phases could potentially cause new internal stresses to form in the microsphere during cooling [11], [12].…”

Section: This Development Creates Many New Applications For Filtratiomentioning

confidence: 99%

Crush Strength Analysis of Hollow Glass Microspheres

Dillinger

Clark

Suchicital

et al. 2018

Ceramic Engineering and Science Proceedings

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“…[16][17][18][19] To enable comparison of our findings with those of a previous study using a Sn alloy/chloride system, 3) the same experimental conditions as those in the previous study were adopted in the present study, including the sampling method, height of each liquid phase, gas flow rate, and composition of the Sn alloy.…”

Section: Methodsmentioning

confidence: 97%

“…(6) for the oxide and chloride systems. 3,[14][15][16][17][18][19][22][23][24][25] It was clear that the difference in the parameter (μ s /μ m ) 0.15 between the two systems was much larger than the difference in other parameters. Therefore, the difference in the viscosity of the upper phase between the two systems might be the key factor governing he difference in the droplet size between the systems.…”

Section: Size Of Metal Dropletsmentioning

confidence: 99%

Metal Emulsion in Sn Alloy/oxide System by Bottom Gas Injection

et al. 2017

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A metal emulsion is formed by the passage of gas bubbles through the interface between the metal phase and the slag phase in the steelmaking process. Emulsified metal droplets have great potential to improve the chemical reaction efficiency during motion in bulk slag. Several studies have focused on the formation mechanism of metal droplets and on the influence of the physical properties of the system on this mechanism. In this study, Sn alloy and sodium tetraborate were used to simulate molten steel and slag, respectively. Gas bubbles were introduced from the bottom of a molten metal bath at various gas flow rates. Slag containing metal droplets at the center of the slag phase was sampled, and the metal droplets were extracted by the dissolution of the oxide in a solvent. The number and diameter of the droplets were measured using a digital microscope. Under the same experimental conditions, the number of metal droplets in the oxide system was smaller but their size was larger than those in a previously investigated Sn alloy/chloride system. In both the systems, the total mass of metal droplets formed by a single bubble increased with an increase in the volume of the gas bubble, and when the volume of the gas bubble was small, the total mass of droplets in the oxide system was smaller than that in the chloride system. The sedimentation rate and coefficient in the oxide system were lower than those in the chloride system.

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