原子能科学技术
原子能科學技術
원자능과학기술
ATOMIC ENERGY SCIENCE AND TECHNOLOGY
2014年
11期
2094-2100
,共7页
Al-UO2 弥散芯块%无压烧结%真空%密度%相结构
Al-UO2 瀰散芯塊%無壓燒結%真空%密度%相結構
Al-UO2 미산심괴%무압소결%진공%밀도%상결구
Al-UO2 dispersion pellet%free pressure sintering%vacuum%density%phase structure
本文研究了环形薄壁Al‐20％UO2弥散芯块的热压烧结和无压烧结工艺，分析了芯块的性能。研究发现：真空热压烧结弥散芯块的密度较低，且易出现开裂问题；真空无压烧结能制备合格的Al‐20％UO2弥散芯块。对Al粉进行PVA湿法造粒，再与UO2粉末进行两步均匀混合，在550MPa成型，Al‐20％UO2压块的成型相对密度达93.45％，外径和内径的弹性后效分别为0.455％和0.194％。在490℃、4×10－2Pa真空无压烧结1h，Al‐20％UO2弥散芯块的烧结相对密度达94.54％；外径为（53.230±0.006）mm，膨胀率为0.415％；内径为（45.506±0.017）mm，膨胀率为0.278％。芯块不经研磨加工，可直接装管密封制成靶件。
本文研究瞭環形薄壁Al‐20％UO2瀰散芯塊的熱壓燒結和無壓燒結工藝，分析瞭芯塊的性能。研究髮現：真空熱壓燒結瀰散芯塊的密度較低，且易齣現開裂問題；真空無壓燒結能製備閤格的Al‐20％UO2瀰散芯塊。對Al粉進行PVA濕法造粒，再與UO2粉末進行兩步均勻混閤，在550MPa成型，Al‐20％UO2壓塊的成型相對密度達93.45％，外徑和內徑的彈性後效分彆為0.455％和0.194％。在490℃、4×10－2Pa真空無壓燒結1h，Al‐20％UO2瀰散芯塊的燒結相對密度達94.54％；外徑為（53.230±0.006）mm，膨脹率為0.415％；內徑為（45.506±0.017）mm，膨脹率為0.278％。芯塊不經研磨加工，可直接裝管密封製成靶件。
본문연구료배형박벽Al‐20％UO2미산심괴적열압소결화무압소결공예，분석료심괴적성능。연구발현：진공열압소결미산심괴적밀도교저，차역출현개렬문제；진공무압소결능제비합격적Al‐20％UO2미산심괴。대Al분진행PVA습법조립，재여UO2분말진행량보균균혼합，재550MPa성형，Al‐20％UO2압괴적성형상대밀도체93.45％，외경화내경적탄성후효분별위0.455％화0.194％。재490℃、4×10－2Pa진공무압소결1h，Al‐20％UO2미산심괴적소결상대밀도체94.54％；외경위（53.230±0.006）mm，팽창솔위0.415％；내경위（45.506±0.017）mm，팽창솔위0.278％。심괴불경연마가공，가직접장관밀봉제성파건。
The hot‐press and free pressure sintering processes of the annular and thin‐walled Al‐20% UO2 dispersion pellets and their properties were studied . The vacuum free pressure sintering can produce good pellet ,but the pellets produced by vacuum hot‐press sintering may easily encounter the problems of low density and cracks .The granu‐lation of Al powders by PVA solution method and two‐step mixing process with UO2 powders were used to fabricate the green body of Al‐20% UO2 with density of 93.45%TD at 550 M Pa ,and it’s outside diameter increases 0.455% and inside diameter increa‐ses 0.194% compared to die‐hole size .The Al‐20% UO2 dispersion pellet was sintered by vacuum free pressure process at 490 ℃ and 4 × 10-2 Pa for 1 h with density of 94.54% TD , and outside diameter of (53.230 ± 0.006) mm with swelling rate of 0.415% ,and inside diameter of (45.506 ± 0.017) mm with swelling rate of 0.278% .These pellets can be loaded into clad tube directly and sealed to assemble target without grinding .
