ICF靶PVA-PS双层空心微球的研制

FABRICATION OF PVAPS DOUBLELAYERED SHELLS FOR ICF TARGTETS

介绍了惯性约束聚变（ＩＣＦ）靶用聚乙烯醇－聚苯乙烯（ＰＶＡ－ＰＳ）双层塑料空心微球的制球工艺及实验结果。采用微封装技术及三维旋转真空干燥技术，制得的ＰＶＡ－ＰＡ双层空心微球，直径１００～５００μｍ，壁厚１０～３５μｍ，（ＰＶＡ层５～１５μｍ，ＰＳ层５～３０μｍ），球形度及同心度分别优于９５％及８５％，表面粗糙度低于３００ｎｍ。该双层微球的主要技术指标均已达到ＩＣＦ制靶要求。

y microencapsulation and rotating drying technique, we have produced PVAPS doublelayer shells that can be used as fuel container of inertial confinement fusion (ICF) targets. First, the W1 phase which contains 3￣7 g PVA and 93￣97 g H2O is poured into a stirred O phase which contains 5￣10 g PS and 90￣95 g CH2Cl2, W1/O is formed. To obtain W1/O/W2 emuision, W1/O emulsion is stirred into W2 phase (1 g gelatin and 99 g H2O). By heating, the CH2Cl2 is removed, solid PS shells which encapsulate W1 phase are formed. After filtered, the PS shells are dried at 40￣50 ℃ and -70￣-50 kPa in a threedimesion rotating dryer, finally PVA is deposited on the inner surface of the PS shells, and PVAPS shells are formed. The doublelayered shells diameter and wall thickness are 100￣500 μm and 10￣35 μm(PVA 5￣15 μm,PS 5￣30 μm) respectively. The nonsphericity and nonconcentricity are less than 5% and 10%. While the surface roughesses are no more than 300 nm.