Vitrification of radioactive waste by reaction sintering under pressure

Gong, Weiliang; Lutze, W.; Abdelouas, Abdesselam; Ewing, R.C.

doi:10.1016/s0022-3115(98)00654-0

Cited by 8 publications

(4 citation statements)

References 22 publications

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“…In a previous work, 5 we showed that refractory oxides (in this case ZrO 2 ), as a powder, react under RSIP conditions quantitatively well below 1000°C, to form a Na 2 O−ZrO 2 −SiO 2 glass. Therefore it was expected that hydroxylapatite would react with other starting materials during RSIP.…”

Section: Glass-ceramicmentioning

confidence: 82%

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Porous bioactive glass and glass-ceramics made by reaction sintering under pressure

Gong

Abdelouas

Lutze

2000

J. Biomed. Mater. Res.

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A glass and a rhenanite-wollastonite glass-ceramic were synthesized with the qualitative composition Na2O-CaO-SiO2-P2O5. Both materials were prepared by reaction sintering under isostatic pressure (RSIP) using powder mixtures. Solid state reactions were complete within a few hours at 950 degrees C under modest pressure. Formation of the glass and crystalline phases was driven by an intermediate, reactive, low viscosity Na2O-SiO2 phase. A reaction mechanism is suggested. Porous materials were obtained with two ranges of pore sizes: 100-200 microm and < or =5 microm in diameter. The glass and the glass-ceramic were corroded in simulated body fluid at 37 degrees C. The evolution of surface features was studied. Gel layers formed on both materials. Corrosion was fastest inside the pores. Microcrystals of apatite were identified by crystal structure analysis and by chemical analysis. During corrosion of the glass-ceramic, rhenanite most likely was converted into apatite. Comparison of these results with published information suggests that the glass and glass-ceramic are bioactive. We suggest that RSIP can be used (a) to control the surface porosity and pore size of bioactive implants, thereby increasing the stability of tissue/implant interfaces; (b) to make glasses and glass-ceramics with new properties; and (c) to make near net-shape materials.

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Section: Glass-ceramicmentioning

confidence: 82%

“…11 Hence, CaO does not initiate reaction sintering with SiO 2 at 950°C. The prime candidate for initiating reaction sintering with amorphous silica is Na 2 O. Respective evidence was provided by Gong et al, 5 who studied this reaction in detail.…”

Section: Glassmentioning

confidence: 99%

Porous bioactive glass and glass-ceramics made by reaction sintering under pressure

Gong

Abdelouas

Lutze

2000

J. Biomed. Mater. Res.

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“…Because of these chemical gradients, perturbations such as pH and redox changes may alter the performance of the barriers over time (Bildstein and Claret 2015). Last but not least, radiological effects also exist in association with the radiological inventory of waste independently from the technological solution, retreatment or direct disposal of irradiated fuels (Odorowski et al 2017) or after reprocessing (Gong et al 1999;Berner et al 2013). Moreover, an additional challenge arises because all of the THMC phenomena described above are coupled.…”

Section: A Need To Consider Coupled Processesmentioning

confidence: 99%

RTM for Waste Repositories

Bildstein

Claret

Frugier

2019

Reviews in Mineralogy and Geochemistry

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“…Sintering is the process of compacting and forming a coherent material under the action of heat. this process is used in several domains such as reconstruction of bone defect in maxillofacial, dental and orthopedic applications (Rodriguez-Lorenzo et al, 2003), (Guidara et al, 2011), treatment of nuclear waste (Gong et al, 1999), fabrication of conductive electrodes for several optoelectronic devices (Sun et al, 2010), etc.…”

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confidence: 99%