Generation of Ultrahigh Pressure and Application of Ultrahigh Pressure to Formation of Diamond from Graphite Powder

Akio Kira; Yoshiaki Tsutsumi; Akio Tasaka; Ryuichi Tomoshige; Kazuyuki Hokamoto; Masahiro Fujita

doi:10.4028/www.scientific.net/MSF.673.275

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Explosive Welding Using Underwater Shock Wave Generated by the Detonation of the Detonating Code
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A Deburring Process Performed by Underwater Shock Wave
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Generation of Ultrahigh Pressure and Application of Ultrahigh Pressure to Formation of Diamond from Graphite Powder
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Structural Evolution of the Cu-Ni Solid Solution Formed by Ball Mechanical Alloying Treatment (BMAT)
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Hot Explosive Compaction of Zinc Sulfide Based Electroluminescent by Double Cylinder Implosion Technique
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Eccentric Spherical Forming of Metal Plate by Underwater Shock Loading
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Dynamic Forming of AZ91 Magnesium Alloy Using Explosive Energy
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HomeMaterials Science ForumMaterials Science Forum Vol. 673Generation of Ultrahigh Pressure and Application...

Generation of Ultrahigh Pressure and Application of Ultrahigh Pressure to Formation of Diamond from Graphite Powder

Abstract:

The purpose of our research is to generate the ultrahigh pressure by using high explosive and to transform a phase of a material. The extremely high impulsive pressure generator that has been developed by us uses the head-on collision between metal jets. Because the velocity of the metal jet is very high, the ultrahigh pressure will generate. If a powdered material is mixed to metal jets, it is expected that the material is transformed to a high pressure phase by this ultrahigh pressure. A graphite powder was used to synthesize a diamond. The existence of the diamond 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 (Volume 673)

Pages:

275-278

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.673.275

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Online since:

January 2011

Authors:

Akio Kira, Yoshiaki Tsutsumi, Akio Tasaka, Ryuichi Tomoshige, Kazuyuki Hokamoto, Masahiro Fujita

Keywords:

Extremely High Impulsive Pressure Generator, Metal Jet, Phase Transformation

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References

[1] 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.

DOI: 10.1142/s0217979208047213

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[2] A. Kira, K. Hokamoto, Y. Ujimoto, S. Kai and M. Fujita: Mater. Sci. Forum Vol. 566 (2008), pp.315-320.

DOI: 10.4028/www.scientific.net/msf.566.315

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