| 摘要 |
An apparatus for operation in the temperature range above 1000 degrees Centigrade and at pressures above 50 kilobars, for making industrial diamonds or the like, includes arrangements for more reliably maintaining uniform temperature while compressing the charge. The high pressure cavity includes the usual insulating cylindrical liner made of a salt, or other insulating material, to facilitate the application of electricity to heat the charge, and the liner stops short of the end of the cylindrical high pressure cavity to avoid deformation as the main piston moves into the end of the high pressure cavity. A ring or rings of zinc and/or lead and/or a zinc-lead alloy, may be located immediately adjacent the end of the insulating liner, and a thin layer of lead may extend across the main piston, to insure confinement within the cavity. Heating arrangements are provided to compensate for the cooling which occurs along and at the ends of the high pressure cavity to thereby achieve more uniform temperature. Arrangements are provided for preventing the tilting of the end heating structure and for stabilizing the movement of the end heater and/or the charge as the heating and compression cycle is initiated. This is accomplished by keeping the space extending from the inner edge of the insulating liner across its opening free of zinc and/or lead which constitute the hydraulic fluid during the heating/compression cycle.
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