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首页> 外文会议>Ceramic materials for energy applications II >THE EFFECT OF TEMPERATURE AND UNIAXIAL PRESSURE ON THE DENSIF1CATION BEHAVIOR OF SILICA AEROGEL GRANULES
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THE EFFECT OF TEMPERATURE AND UNIAXIAL PRESSURE ON THE DENSIF1CATION BEHAVIOR OF SILICA AEROGEL GRANULES

机译：温度和单轴压力对二氧化硅气凝胶颗粒致密化行为的影响

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Materials are being developed in the U.S. for the removal and immobilization of radioiodine from the gas streams in a nuclear fuel reprocessing. Silver-functionalized silica aerogel is being investigated because of its high selectivity and sorption capacity for iodine and its possible conversion to a durable silica-based waste form. In the present study, we investigated the effect of pressureless isothermal sintering at temperatures of 900-1400 ℃ for 2.5-90 min or isothermal hot-pressing at 1200 ℃ for 2.5 min on densification of raw and silver-functionalized silica aerogel granules with nitrogen sorption and helium pycnometry. Rapid sintering was observed at 1050 and 1200 ℃. Pressureless sintering for only 15 min at 1200 ℃ resulted in almost complete densification: the macropores disappeared, the specific surface area decreased from 114m~2/g to 25 m~2/g, pore volume from 7.41 × 10~(-3) m~3/kg to 9×10~(-5)m~3/kg, and adsorption pore size from 18.7 to 7 nm. The skeletal density of sintered granules was similar to the bulk density of amorphous silica (2.2 × 10~3 kg/m~3). Low-pressure hot-pressing accelerated the sintering process, decreasing significantly the pore size and pore volume.
机译：在美国，正在开发用于在核燃料后处理中从气流中去除和固定放射性碘的材料。由于银官能化的二氧化硅气凝胶对碘的高选择性和吸附能力，并且可能转化为耐用的二氧化硅基废物形式，因此正在研究中。在本研究中，我们研究了在900-1400℃的温度下进行2.5-90分钟的无压等温烧结或在1200℃的条件下进行等温热压2.5分钟对具有氮吸附作用的原料和银官能化二氧化硅气凝胶颗粒致密化的影响和氦比重瓶。在1050和1200℃观察到快速烧结。在1200℃下仅15分钟的无压烧结导致几乎完全致密化：大孔消失，比表面积从114m〜2 / g降至25 m〜2 / g，孔体积从7.41×10〜（-3）m 〜3 / kg至9×10〜（-5）m〜3 / kg，吸附孔径为18.7至7 nm。烧结颗粒的骨架密度类似于无定形二氧化硅的堆积密度（2.2×10〜3 kg / m〜3）。低压热压加速了烧结过程，显着减小了孔径和孔体积。

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  • 会议地点 Daytona Beach FL(US);Daytona Beach FL(US);Daytona Beach FL(US);Daytona Beach FL(US);Daytona Beach FL(US);Daytona Beach FL(US)
  • 作者

    J. Matyas; M. J. Robinson; G. E. Fryxell;

  • 作者单位

    Pacific Northwest National Laboratory Richland, WA, USA;

    Pacific Northwest National Laboratory Richland, WA, USA;

    Pacific Northwest National Laboratory Richland, WA, USA;

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