Processing of uranium oxide and silicon carbide based fuel using polymer infiltration and pyrolysis

Singh, Abhishek Kumar; Zunjarrao, Suraj C.; Singh, Raman P.

doi:10.1016/j.jnucmat.2008.04.022

Cited by 16 publications

(6 citation statements)

References 35 publications

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“…Pellets with designed porosity can provide reservoirs for the fission gases and potentially solve this problem. It should be noted that most of the open pores can be closed with several polymer infiltration and pyrolysis cycles [24,25]. This process will be reported in a subsequent publication.…”

Section: Effect Of Cold Pressing Pressurementioning

confidence: 81%

Low-temperature synthesis of silicon carbide inert matrix fuel through a polymer precursor route

Shih

Tulenko

Baney

2011

Journal of Nuclear Materials

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Section: Effect Of Cold Pressing Pressurementioning

confidence: 81%

Low-temperature synthesis of silicon carbide inert matrix fuel through a polymer precursor route

Shih

Tulenko

Baney

2011

Journal of Nuclear Materials

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“…The loss in weight is attributed to the loss of low-molecular weight oligomers and hydrogen gas [15]. About 72-74% ceramic yield in the form of amorphous SiC was obtained in the range of 900-1650 C. The material processed to 1150 C is stoichiometric SiC, as discussed in [16].…”

Section: Experiments and Resultsmentioning

confidence: 99%

Advanced Model of Silicon Carbide Based Uranium Ceramic Nuclear Fuel Production

Wang

Zunjarrao

Singh

et al. 2009

Journal of Thermophysics and Heat Transfer

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A system-level model combining heat and mass transport and chemical reaction is developed to study siliconcarbide-based uranium ceramic material processing. This process is based on pyrolysis and synthesis of a mixture of preceramic polymers and uranium oxide particles. Three key steps for polymer pyrolysis and one key reaction for uranium oxide and silicon carbide interaction are established for the processing. The mechanism of vapor species transport is described by introducing a driving force induced by both natural and forced convection. The effects of geometry of sample, driving force, and particle size and volume fraction of filler, uranium oxide, on the porosity evolution, species uniformity, and reaction rate of the sample are investigated. Nomenclature C p = specific heat at constant pressure, J=kg K d p = equivalent average particle diameter, m d = particle diameter, m E a = activation energy, J=mol f = volume fraction K = permeability, m 2 k = thermal conductivity, W=m K M = mass, kg n = ratio of diameter of large particles and small particles P = pressure, Pa q 00 = heat flux, W=m 2 _ R = reaction rate R = universal gas constant, 8.314 J=mol K r = radial coordinate T = temperature, K T" = tortuosity t = time, s u = velocity vector u r = radial velocity, m=s u z = axial velocity, m=s V = volume, m 3 Y = species mass fraction Z = preexponential H = heat of reaction, J=mol P 1 = driving force induced by natural convection, Pa P 2 = driving force induced by forced convection, Pa Z = elevation difference, m " m = emissivity " = porosity = viscosity, kg=m s = density, kg=m 3 Subscripts eff = effective g = gas r = radial direction s = mixed solid side = side surface top = top surface total = total 1 = surrounding 0 = reference 1 = first reaction, uranium oxide 2 = second reaction, polymer 3 = third reaction

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“…Since AHPCS derived SiC has been evaluated as a potential candidate for structural applications as well as matrix for nuclear fuel [6], physical properties like thermal conductivity and density are also of great concern for increase in thermal efficiency. Moraes et al reported increase in density with increasing processing temperature for SiC derived from AHPCS [1].…”

Section: Introductionmentioning

confidence: 99%

Effect of degree of crystallinity on elastic properties of silicon carbide fabricated using polymer pyrolysis

Rahman

Zunjarrao

Singh

2016

Journal of the European Ceramic Society

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Please cite this article in press as: A. Rahman, et al., Effect of degree of crystallinity on elastic properties of silicon carbide fabricated using polymer pyrolysis, J Eur Ceram Soc (2016), http://dx. a b s t r a c tIn this study, silicon carbide (SiC) is fabricated using polymer infiltration and pyrolysis (PIP). Allylhydridopolycarbosilane (AHPCS) is used as the preceramic polymer. Final processing temperatures are varied to observe the change in microstructure as well as physical and mechanical properties. Density, porosity and thermal conductivity are determined as a function of processing temperatures. Microstructural characterization, done using atomic force microscopy (AFM) and X-ray diffraction (XRD), has revealed the presence of nanocrystalline domains with grain sizes in the range of 5-20 nm. The degree of crystallinity is determined using non-contact mode atomic force microscopy. The degree of crystallinity follows an increasing trend with processing temperature. Hardness and modulus are determined using nanoindentation, and are found to be influenced by the degree of crystallinity.

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Processing of uranium oxide and silicon carbide based fuel using polymer infiltration and pyrolysis

Cited by 16 publications

References 35 publications

Low-temperature synthesis of silicon carbide inert matrix fuel through a polymer precursor route

Low-temperature synthesis of silicon carbide inert matrix fuel through a polymer precursor route

Advanced Model of Silicon Carbide Based Uranium Ceramic Nuclear Fuel Production

Effect of degree of crystallinity on elastic properties of silicon carbide fabricated using polymer pyrolysis

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