| 摘要 |
An improved ultrahigh pressure apparatus which comprises; a pair of opposed frustoconical punches, an annular die which has a central bore therethrough formed straight-cylindrical at least partially at an inner portion and which is placed between and in alignment with said punches, a rigid hollow cylinder which is placed in a circumferential contact with the straight cylindrical bore face of the die, and a pair of gaskets of a readily deformable material which are each placed around a conical face of punches and adjacent to a bore face portion of the die outside the rigid cylinder and to an orifice of said cylinder, which apparatus is characterized in that said rigid hollow cylinder has a bore face formed substantially quarter-circular or quarter-elliptical, in a radial section taken along an axis thereof, starting at either axial end and ending at a central portion thereof.
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