ICF物理实验用纳米Cu块体靶材的制备研究
Preparation synthesis of nanocrystalline copper target material for ICF experiments
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摘要: 采用自悬浮定向流法制备了金属纳米粉体并采用真空手套箱专利技术和冷压法在高压（1.5 GPa）作用下保压40 min后，成功制备出了相对密度达97％和显微硬度达1.85 GPa的金属Cu纳米晶材料。经XRD分析，其晶粒大小为20 nm。正电子湮没(PAS)实验结果表明，其空隙大小和数量与采用惰性气体冷凝法原位压制(IGC)的样品相比，空位簇数量较多，微空隙的大小和数量基本相当。激光惯性约束聚变（ICF）模拟实验表明：采用该方法制备的纳米Cu块体材料靶的激光转换效率比常规Cu材料靶高5倍。Abstract: Copper nano-particles were prepared by flow-levitation method and compacted for 40 min under pressure of 1.5 GPa by cold pressing method . The pressing process was studied well under 25 ℃ and inert gas protection. The relative density and the microhardess of a specimen were 97% and 1.85 GPa, respectivity. XRD analysis showed that the average grain size of the specimens was 20 nm. The positron annihilation spectroscopy (PAS) results showed that the size and amount of the vacancies and microvoids were similar to those of the nanocrystalline Cu prepaered by inert gas condensation method (IGC) but more large voids. The simulation experiment of inertial confinement fusion indicated that the efficiency of Kα-ray conversed from laser with nanocrystalline Cu was 5 times higher than that of coars
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