A new method has been developed to generate an extremely high impulsive pressure by
using a metal jet that is discharged when a metal collides with another metal. The high pressure is
used to synthesize a new material. When a metal plate was accelerated by the detonation of an
explosive, it collides with the concentric circle of the conic surface of a conical concave metal block
metal jets are discharged from all parts on the concentric circle. The metal jets fly toward the center
while converging and collide with each other at the central axis. Because those collide at high-speed
pressure becomes extremely high. The flight direction of the converged metal jet changes
downward. The metal jet collides with the bottom of the block. A large hole is formed inside the
bottom. The formation process of the hole was examined by the observation of the section of the
block. A specimen powder that was rubbed to the conic surface is discharged with the metal jet and
become the high pressure. The specimen powder is synthesized to a different material. The
synthesized material is held inside the formed hole. The existence of cBN was confirmed by the
X-ray diffraction of the synthesized material, in the case that BN was used as the specimen powder.
Similarly, the existence of diamond was confirmed in the case of graphite powder.
