摘要
为实现惯性约束聚变靶用空心玻璃微球的干凝胶法高效制备,从数值模拟和工艺实验两个方面研究了载气组份对干凝胶粒子炉内成球过程及最终空心玻璃微球性能的影响。结果表明：载气组份显著影响粒子/微球与载气之间的热量和质量传递过程,但载气组份对粒子/微球在炉内的下落速度影响很小;提高载气中氦气的体积分数可以显著提高干凝胶粒子在吸热阶段的升温速率,更为迅速有效地完成封装过程,这不仅使得干凝胶粒子发泡成为空心球的比例增大,而且还有利于制备得到大纵横比的空心玻璃微球;但是,在载气中保持适当体积分数的氩气,有利于提高玻璃微球的表面质量和成品率。当载气中氦气的体积分数在50%－80%时,干凝胶粒子的成球率较高,空心玻璃微球的球形度、同心度和表面粗糙度能满足制靶要求。
To fabricate high quality hollow glass microspheres （HGMs） for inertial confinement fusion （ICF） targets by sol- gel technology, effects of furnace atmosphere composition on the transformation process from gel particles to HGMs and the re- sulting quality of HGMs were investigated by numerical simulation and experiments. The results show that the furnace atmos- phere composition significantly affects the heat and mass transfer process between particles/microspheres and furnace atmosphere, but the falling velocity of the particles/microspheres in drop-tower furnace changes only slightly with the furnace atmosphere com- positions. The heating-up rate of gel particles in heat-absorbing stage increases remarkably with the increase of the content of heli- um in the furnace atmosphere and increasing the helium content accelerates effectively the encapsulation of gel particles. Conse- quently, higher helium content in furnace atmosphere will result in higher HGM yield with high quality and larger HGM aspect ra- tio. However, maintaining a proper proportion of helium in the furnace atmosphere is necessary to improve HGM surface smooth- ness. With the volume percentage of helium ranging from 50% to 80%, HGMs with high sphericity, concentricity and surface smoothness can be fabricated with high yield.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2010年第7期1543-1547,共5页
High Power Laser and Particle Beams
基金
高温高密度等离子体物理国防科技重点实验室基金项目(9140C6806030908)
关键词
干凝胶法
空心玻璃微球
惯性约束聚变
靶制备
sol-gel technology
hollow glass microsphere
inertial confinement fusion
target fabrication
