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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Manufacturing of porous niobium phosphate glasses
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Manufacturing of porous niobium phosphate glasses

机译：多孔磷酸铌玻璃的制造

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Niobium phosphate glasses with composition 33P(2)O(5)center dot 27K(2)O center dot 40Nb(2)O(5) are usually very stable with regard to crystallization resistance, with a relatively high glass transition temperature (T-g 750 degrees 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 degrees 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 degrees 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. (c) 2006 Elsevier B.V. All rights reserved.
机译：组成为33P（2）O（5）中心点27K（2）O中心点40Nb（2）O（5）的磷酸铌玻璃通常具有非常高的抗结晶性，且玻璃化转变温度较高（Tg 750）摄氏度），并且可能适合固定化核废料。通过复制法制备多孔磷酸铌玻璃。多孔玻璃是通过将包含20 wt％的粉末状玻璃的水性浆料浸涂到商用聚氨酯泡沫中制成的。渗透的泡沫在600摄氏度下氧化30分钟，以分解聚合物链并燃烧掉碳，导致玻璃骨架易碎。随后在780-790摄氏度范围内的玻璃化转变温度之上加热1小时，最终产生机械稳定的玻璃泡沫，该泡沫保持了聚氨酯泡沫的原始互连孔结构。支杆显示出颗粒之间的颈状结构，证明了烧结的初始阶段。玻璃泡沫的开孔和互连的孔隙率在85-90vol。％的范围内。结论是多孔磷酸铌玻璃是固定液态核废料的潜在候选者。 （c）2006 Elsevier B.V.保留所有权利。

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