کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1486050 1510550 2006 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Manufacturing of porous niobium phosphate glasses
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Manufacturing of porous niobium phosphate glasses
چکیده انگلیسی

Niobium phosphate glasses with composition 33P2O5 · 27K2O · 40Nb2O5 are usually very stable with regard to crystallization resistance, with a relatively high glass transition temperature (Tg ∼ 750 °C), and are potentially suitable for nuclear waste immobilization. Porous niobium phosphate glasses were prepared by the replication method. The porous glasses were produced via the dip-coating of an aqueous slurry containing 20 wt% powdered glass into commercial polyurethane foams. The infiltrated foams were oxidized at 600 °C for 30 min to decompose the polymeric chains and to burn out the carbon, leading to a fragile glass skeleton. Subsequent heating above the glass transition temperature in the range of 780–790 °C for 1 h, finally resulted in mechanically stable glass foams, which maintained the original interconnected pore structure of the polyurethane foam. The struts showed the neck formation between particles, evidencing the initial stage of sintering. The open and interconnected porosity of the glassy foams lies in the range of 85–90 vol.%. It was concluded that porous niobium phosphate glasses are potential candidates for immobilizing liquid nuclear waste.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Crystalline Solids - Volume 352, Issues 32–35, 15 September 2006, Pages 3739–3743
نویسندگان
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