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Overview of FGM Research in Japan

Published online by Cambridge University Press:  29 November 2013

M. Koizumi  and
M. Niino
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Extract

Space planes require high-performance heat-resistant materials which can withstand ultrahigh temperatures and extremely large temperature gradients. To meet these needs, functionally gradient materials (FGMs) were proposed about 10 years ago in Japan.

Figure 1 shows a conceptual diagram of functionally gradient materials, taking into account the relaxation of thermal stress. For the surface that contacts high-temperature gases at thousands of degrees, ceramics are used to provide adequate heat resistance. For the surface that provides cooling, metallic materials are used to furnish the necessary thermal conductivity and mechanical strength. In addition, the composition of these materials is formulated to provide optimum distribution of composition, structure, and porosity to effectively relax thermal stress.

Since fiscal 1987, an R&D project entitled “Research on Fundamental Techniques to Develop Functionally Gradient Materials for Relaxation of Thermal Stress,” which aimed to develop ultra heat-resistant materials, had been carried out with special coordination funds from the Science and Technology Agency. The five-year project had two phases; Phase I was carried out from 1987 to 1989, and Phase II from 1990 to 1991.

Type
Functionally Gradient Materials
Information
MRS Bulletin , Volume 20 , Issue 1 , January 1995 , pp. 19 - 21
Copyright
Copyright © Materials Research Society 1995

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References

1.Investigation Report on the Fundamental Techniques of New Composite Materials for Relaxation of Thermal Stress (Science and Technology Agency of Japan, March, 1987).Google Scholar
2.National Project Research Report, “Research on Functional Techniques to Develop Functionally Gradient Materials for Relaxation of Thermal Stress, Phase I,” edited by Research Society of Functionally Gradient Materials (May 1990).Google Scholar
3.National Project Research Report, “Research on Functional Techniques to Develop Functionally Gradient Materials for Relaxation of Thermal Stress, Phase II,” edited by Research Society of Functionally Gradient Materials (October 1992).Google Scholar
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7.Investigation Report on the Improvement of Energy Conversion Efficiency by Functionally Gradient Material Technology (Science and Technology Agency of Japan, 1993).Google Scholar