1. The Use of a Functionally Graded Material in the Manufacture of a Graded Permittivity Element
- Author
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A. Tokumura, Y.W. Kim, Niichi Hayashi, T. Ishikura, Y. Uchida, D. Dykes, Gerard Touchard, Shigeo Watanabe, and S. Higa
- Subjects
Permittivity ,Engineering drawing ,Materials science ,Scanning electron microscope ,law ,Lamination ,Relative permittivity ,Conductivity ,Composite material ,Functionally graded material ,law.invention - Abstract
1. ABSTRACT The authors of this paper have previously developed a vacuum filtration technique for the manufacture of functionally graded materials (FGMs) by a progressive lamination method. For this, they have been granted a U. S. patent. Using this method, it is possible to manufacture FGMs with thicknesses ranging from several millimetres to several centimetres. The authors have already produced an iron (III) oxide-kaolin FGM, the graded condition of which they have verified by means of a scanning electron microscope. In addition, they have performed measurements to determine this material’s electrical properties viz: conductivity, relative permittivity and magnetic permeability. The present paper reports an experiment to create a different type of FGM, characterised by graded permittivity. The constituent materials used are titanium oxide and kaolin. The graded condition of manufactured specimens was investigated by mean of scanning electron microscope photographs and measurements of relative permittivity. Relative permittivity was found to vary between 2 and 5, while the photographs confirmed that the specimens were smoothly graded. On the basis of these results, it seems probable that graded permittivity elements can be manufactured using the authors’ method.
- Published
- 1997