模板法制备透明氧化铝空心球的研究

发布时间：2018-05-31 17:51

本文选题：模板法 + 乳液微封装法　；参考：《西南科技大学》2015年硕士论文

【摘要】：在ICF研究中,制靶技术是其四大支柱之一。在ICF制靶技术中,如何获得高能量增益的靶,是制靶技术的关键。而透明氧化铝空心球由于其独特的优点作为ICF的靶丸具有良好的应用前景。本文探讨了以聚甲基丙烯酸甲酯(PMMA)微球为模板,采用化学包覆法制备氧化铝空心球,但没有获得预期的结果;研究了利用乳液微封装技术结合溶胶-凝胶法制备氧化铝空心球及透明氧化铝空心球,采用傅立叶红外光谱仪(FT-IR)、X射线衍射仪(XRD)、扫描电子显微镜(SEM)及能谱分析仪(EDX)等对样品进行了表征,并探讨了空心球的形成机理。以悬浮聚合法合成了粒径为0.5~3mm单分散性良好的PMMA模板球,结合化学包覆法制备的核壳结构Al2O3/PMMA,由于包覆层较薄,致密度较低,煅烧后不能得到Al2O3空心球。利用乳液微封装法制备出了球径在500μm~2200μm之间,壁厚在30~100μm的单分散性良好的Al2O3空心球,其表面光滑,球形度在98%以上,而不同心度在3%左右,粒径40%集中在1100~1300μm之间,80%左右集中在900~1500μm之间。掺杂烧结助剂的空心球样品经真空烧结制备出了透明氧化铝空心球,其表面均方根粗糙度约为3.13μm;以氮作为气体,透明样品的综合热传递系数数量级在103W·m-2·K-1。经研究:掺杂适量的La2O3和Mg O可以抑制晶粒的生长,促进烧结的致密化,提高透明氧化铝陶瓷的光透过率。La2O3和Mg O的含量分别为0.1wt.%和0.1wt.%时,透明氧化铝陶瓷空心球在激光波长为532nm处的光透过率分别为42%左右和45%左右。
[Abstract]:In the research of ICF, target making technology is one of its four pillars. In the ICF target making technology, how to obtain the target with high energy gain is the key of the target making technology. The transparent alumina hollow ball has a good application prospect as a target of ICF because of its unique advantages. In this paper, the preparation of alumina hollow spheres using polymethyl methacrylate (PMMA) microspheres as template and chemical coating method was studied, but the expected results were not obtained. The preparation of alumina hollow spheres and transparent alumina hollow spheres by emulsion microencapsulation combined with sol-gel method was studied. The samples were characterized by FT-IR X-ray diffractometer, scanning electron microscope (SEM) and energy dispersive analyzer (EDX), and the formation mechanism of hollow spheres was discussed. PMMA template spheres with good monodispersity of 0.5~3mm were synthesized by suspension polymerization. Al _ 2O _ 3 / PMMA with core-shell structure was prepared by chemical coating method. Because of the thin coating layer and low density, Al2O3 hollow spheres could not be obtained after calcination. Al2O3 hollow spheres with a diameter of 500 渭 m or 2 200 渭 m and a wall thickness of 30 ~ 100 渭 m were prepared by emulsion microencapsulation. The surface of the hollow spheres was smooth, the sphericity was over 98%, and the concentricity was about 3%. The particle size of 40% was concentrated in the range of 1100 ~ 1300 渭 m and 80% in the range of 900 ~ 1500 渭 m. Transparent alumina hollow spheres were prepared by vacuum sintering of hollow spheres doped with sintering aids. The surface root-mean-square roughness was about 3.13 渭 m, and the comprehensive heat transfer coefficient of transparent samples was 103W m-2 K-1 with nitrogen as gas. The results show that doped with La2O3 and MgO can inhibit grain growth and promote sintering densification. When the content of La _ 2O _ 3 and MgO is 0.1 wt.% and 0.1 wt.%, respectively, the light transmittance of transparent alumina ceramics can be increased by 0.1 wt.% and 0.1 wt.%, respectively. The optical transmittance of transparent alumina hollow spheres at 532nm is about 42% and 45% respectively.
【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ133.1

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