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首页> 外文会议>Proceedings of the workshop on manufacturing technology and process for reactor fuels >Study on the change in pore characteristics and sinterability of UO_2 powder by attrition-milling
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Study on the change in pore characteristics and sinterability of UO_2 powder by attrition-milling

机译：磨磨法研究UO_2粉末的孔特性和烧结性变化

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The change of characteristics of pores in the power particles by milling was investigated together with those of powder characteristics and sinterability. The sample used in the experiment was the UO_2 powder prepared by AUC conversion process, of which the characteristics are ; of average particle size of 20μm and spheroidal shape giving free flowing property. When the powder underwent milling treatment for about 1 hr, average particle size decreased from 25 to 0.5μm corresponding the surface area increase from 4.8m~2/g to 6.0m~2/g.rnThe pore size distribution for unmilled powder was bimodal, the first peak being between 3 and 8μm and the second between 0.05 and 0.2μm. As milling continued, change in pore volume was such that the first peak decreased and that of the second increased both in the powder and compacted body, but the size unchanged.rnWhen the milled powder was compacted, pore size and volume decreased as compaction pressure increased. As the sinterability of milled UO_2 powder increased due to the change in powder characteristics, about 3% T.D. of sintered density increment occurred compared with virgin condition in reducing atmosphere(1700℃ /4h, H_2 atm.), grain size being independent of the change in powder characteristics. When the powder was sintered in oxidizing atmosphere(1250℃/4h, CO_2/CO atm.), grain size increased up to about 2 times(9-16μm) but also found to be independent of powder characteristics in this atmosphere.
机译：研究了粉磨过程中粉末中气孔特性的变化以及粉末特性和可烧结性的变化。实验中使用的样品为通过AUC转化法制备的UO_2粉末，其特征为：平均粒径为20μm的球状，具有自由流动的特性。粉末经过约1小时的研磨处理后，平均粒径从25μm减小到0.5μm，表面积从4.8m〜2 / g增加到6.0m〜2 /g。rn未研磨粉末的孔径分布是双峰的，第一个峰在3至8μm之间，第二个峰在0.05至0.2μm之间。随着研磨的进行，粉体和压实体的孔体积发生变化，第一个峰减小，第二个峰增加，但尺寸不变.rn当压实粉体时，随着压实压力的增加，孔尺寸和体积减小。随着粉体特性的变化，UU_2粉末的烧结性提高，在还原气氛（1700℃/ 4h，H_2 atm。）下，与原始状态相比，烧结密度增加了约3％TD。在粉末特性上。当在氧化气氛（1250℃/ 4h，CO_2 / CO atm。）下烧结粉末时，晶粒尺寸增加了约2倍（9-16μm），但在这种气氛下也不受粉末特性的影响。

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