Phase Transformation of Powdered Material by Using Metal Jet

Akio Kira; Ryuichi Tomoshige; Kazuyuki Hokamoto; Masahiro Fujita

doi:10.4028/www.scientific.net/MSF.706-709.741

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HomeMaterials Science ForumMaterials Science Forum Vols. 706-709Phase Transformation of Powdered Material by Using...

Phase Transformation of Powdered Material by Using Metal Jet

Abstract:

The various techniques of phase transformation of the material have been proposed by many researchers. We have developed several devices to generate the ultrahigh pressure by using high explosive. One of them uses metal jets. It is expected that the ultrahigh pressure occurs by the head-on collision between metal jets, because the velocity of the metal jet is very high. By mixing a powdered material with metal jets, the pressure of the material becomes high. The purpose of this study is to transform the phase of the powdered material by using this high pressure. The powders of the graphite and hBN were applied. The synthesis to the diamond and cBN was confirmed by X-ray diffraction (XRD). In this paper, the mechanism of the generation of the ultrahigh pressure is explained and the results of the observation of the powder by using scanning transmission electron microscope (STEM) are reported.

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Periodical:

Materials Science Forum (Volumes 706-709)

Pages:

741-744

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.706-709.741

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Online since:

January 2012

Authors:

Akio Kira, Ryuichi Tomoshige, Kazuyuki Hokamoto, Masahiro Fujita

Keywords:

Extremely High Impulsive Pressure Generator, Metal Jet, Phase Transformation

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References

[1] R. Tomoshige, M. Fujita, A. Kato, K. Hokamoto, S. Itoh and Y. Ujimoto: Impact Eng. and Application Vol. II (2001), pp.927-932.

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[2] A. Kira, K. Hokamoto, Y. Ujimoto, S. Kai and M. Fujita: International Journal of Modern Physics B, Vol. 22, No. 9, 10 and 11 (2008), pp.1653-1658 Fig. 5 STEM micrograph and EDX analysis result.

DOI: 10.1142/s0217979208047213

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