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近年来利气相生长的方法制备高质量薄膜倍受人们重视。在地面上用气相沉积方法生长薄膜。由于重力作用人们很难精确控制传热和传质行为,从而影响薄膜质量。微重力条件,可以抑制气相传输过程中重力引起的对流,可望获得厚度均匀、表面质量好、结构完整的高质量薄膜。美国、俄国、日本、欧空局所属国等都投入相当大的人力、物力进行这一领域的研究工作。但是,空间实验昂贵,设备复杂,限制了空间实验的大量进行;进行充分的地基工作,如进行样品筛选、研究重力场效应等是十分迫切的任务。通过改变薄膜生长方向与重力场方向之间的相对取向关系来研究重力场的作用,对于指导地面及空间实验、对于探讨重力场对薄膜生长的物理本质具有重大意义。
In recent years, the development of gas-phase growth method to produce high-quality film much attention. The film is grown on the ground by vapor deposition. It is difficult to precisely control the heat transfer and mass transfer behavior due to gravity, thus affecting the film quality. Microgravity conditions, can inhibit the convection caused by gravity during the gas phase transmission, is expected to obtain high-quality thin film with uniform thickness, good surface quality and complete structure. The United States, Russia, Japan, ESA-affiliated countries and so on have devoted considerable manpower and resources to conducting research in this field. However, the space experiment is expensive and the equipment is complicated, which restricts the large-scale experiment of space. It is a very urgent task to conduct sufficient foundation work such as sample screening and grasping of gravity field effect. Studying the effect of gravitational field by changing the relative orientation between the growth direction of the film and the direction of the gravitational field is of great significance for guiding the experiment of the ground and space in order to discuss the physical nature of the gravitational field on the growth of the thin film.