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  • Fabrication method of FGM thin films using very strong acceleration field

    Paper number

    IAC-05-A2.1.01

    Author

    Mr. Takashi Nishiyama, Kyushu University, Japan

    Coauthor

    Mr. Shusaku Iba, Kyushu University, Japan

    Coauthor

    Prof. Kunihito Nagayama, Kyushu University, Japan

    Year

    2005

    Abstract
    The material that has continuous change of the composition or of the function is called functionally graded material (FGM).  In the 1980s, the concept of FGM was  first proposed by aerospace researchers in Japan.  Recently, FGM researches are active  in various fields, including fields of energy materials, optoelectronics, and biomaterials, etc. as well as aerospace field.  Moreover, the research using a strong acceleration field  for that purpose has not been made extensively compared with the research of microgravity field.
    We think that it is possible to realize the composition of two-component system thin film material gradient by using a strong acceleration field, and we are developing a centrifuge machine to make FGM thin films.  This equipment has a mechanism to generate a strong acceleration field by a high-speed rotating disc in the vacuum chamber that can achieve its gravity about 100,000 G on the thin film sample. 
    In acceleration field, a body force acts directly to each atom according to its atomic weight.  Heavy atoms are exerted stronger force in the acceleration direction than light atoms.  As a result, atomic-scale-graded structure will be generated in the two-component solid material system.  This phenomenon was confirmed and reported in a variety of two-component bulk material system.  On the other hand, the behavior of atoms is not clarified when the target material is a thin film. The aim of this research is to generate the atomic-scale-graded structure in the thin film, and to clarify the effect that high gravity causes the thin film. 
    FeSi\small2 thin film made on the sapphire substrate by sputter method is used as an experimental sample.  After the sample has been given centrifugal processing, it is examined by EDX method to obtain the change in the element distribution, and the effect of a strong gravitational field on the composition of the thin film is revealed. 
    
    Abstract document

    IAC-05-A2.1.01.pdf

    Manuscript document

    IAC-05-A2.1.01.pdf (🔒 authorized access only).

    To get the manuscript, please contact IAF Secretariat.