Abstract:
A high temperature high pressure apparatus which comprises: an annular die having a straight cylindrical bore and a substantially conical face in adjacency outwards with each end thereof, a pair of tapered punches which are in opposed and axial alignment with the die so that a conical face of each punch is substantially in parallel with that of the die, a pair of inner gaskets, each of which is made of fired refractory and is arranged in direct abutment on the conical face of the punch and the bore of the die, a pair of outer gaskets, which are made of material of intermediate hardness level and is arranged in adjacency outside the inner gasket, and a pair of stopper rings of readily deformable but highly tough material and arranged in adjacency outwards to the outer gaskets.
Abstract:
Reaction vessel construction is described for suppressing spontaneous diamond nucleation and simultaneously reducing the flaw content in the main body of diamond grown from diamond seed material by the process broadly disclosed in U.S. Pat. No. 3,297,407 to Wentorf, Jr.In the reaction vessel construction the body of catalyst-solvent metal is formed with at least one small tip projecting from the underside thereof. A single diamond seed is placed in contact with this (or each) tip. The underside of the plug of catalyst-solvent metal is in contact with a nucleation-suppressing disc, or layer, of a material different from the catalyst-solvent and selected from a specific group of materials. In each case the tip of catalyst-solvent metal projects through a hole in the disc or layer to make contact with the diamond seed material.
Abstract:
A device for building-up high pressures, in which the die surfaces facing each other are provided with circular grooves intended to be filled with a solid medium and arranged concentrically to, and beyond, the central sections of the dies. On closing of the dies, these circular grooves form spaces filled with the solid medium.
Abstract:
A piston type system for forming industrial diamonds is provided with a pressure vessel which includes a tungsten carbide member having a central opening which has a tapered mouth at one end, and which is lined with a salt bushing. A charge including invar and graphite to be converted to diamond is inserted within the pressure chamber inside the salt bushing. An end load plate has a central opening of substantially the same diameter as the opening in the salt bushing and has a tapered flange which fits into the tapered mouth in the tungsten carbide pressure vessel. A tungsten carbide piston which has a diameter about 0.003 inch less than the diameter of the opening in the end plate, and which has a lead gasket between its surface and that of the opening in the end plate, is forced through the end plate and applies high pressure at high temperatures to the charge, thereby converting the graphite to diamond after the passage of a suitable period of time. The tungsten carbide piston need only have the diameter of the inner diameter of the salt bushing, instead of a diameter equal to the full I.D. of the tungsten carbide pressure vessel.
Abstract:
A high pressure/temperature device comprises two complementary dies with recesses in locking surfaces thereof, the recesses forming a reaction chamber accommodating a reaction mass container. Radial slots in the die locking surface are intended for disposing therein electric conductors connected to a measuring element, e.g. a thermojunction, incorporated into the reaction mass.
Abstract:
A high pressure apparatus for synthesizing diamonds which comprises a pair of opposed tapered pistons each having a truncated end surface, a pair of hollow truncated-conical piston protectors each of which is made of a ductile metal and arranged on the tapered piston surface, and annular die member having a substantially cylindrical wall of a diameter larger than that of each piston truncated end surface, a hollow cylindrical body made of less compressibility coefficient material than the die material and having an outer diameter substantially same or slightly smaller than the diameter of said truncated end surface of each pistons and positioned coaxially within the die cylindrical wall, and gaskets placed respectively at the ends of said cylindrical body.
Abstract:
A device for generating high pressures and temperatures, in which in the pressure chamber of a high strength metallic pressure container, a charge of material laterally surrounded by electrically insulating material by means of two piston rams movable in opposite direction with regard to each other and sealed relative to the pressure container is subjected to pressure while being electrically heated. The pressure container comprises at least two axially aligned metallic ring members of high strength hard metal which define a pressure chamber, while between the rings and between the rings and a matrix surrounding the rings, pressure resistant electrically insulating material is provided. Outside the pressure chamber, sealing means of plastically deformable strong metallic material are provided between the piston rams and the rings.
Abstract:
A die pair for use in high temperature high pressure apparatus for use in the synthesis of super hard materials such as diamonds, cubic boron nitride or the like in which the dies include an annular step structure on confronting cooperating faces of the dies to afford over an extended period of time stable, repetitive temperatures in the order of thousands of degrees centigrade and pressures in the order of 60 thousand atmospheres; the confronting die faces having recesses forming a pressure chamber and step structure cooperating with a deformable container of a thermo-and-electro-insulating material such as lithographic stone etc. which deforms as heated and has pressure applied thereto to form an annular sealing ''''burr'''' of a greater volume than an outer surrounding annular slot filled with a porous plastic, electro-insulating material such as ''''technical rubber'''' etc.; the deformable container being of a volume to fill the space both inwardly and outwardly of the material being treated up to the confronting edge of annular surrounding steps; the outer steps having radial, transverse slots; staggered in confronting relation; for readily accommodating the porous plastic outer seal.
Abstract:
This invention relates to high-pressure dies normally used for use in the synthesis of diamonds. The die comprises a die ring having a through cavity within which there is formed a pressure chamber that is lined with a pyrophyllite sleeve. Respectively entering the ends of the sleeve are two plungers. These plungers are capable of sliding in the sleeve until near the end of their compressive strokes so that little or no axial pressure is applied to the ends of the sleeve.
Abstract:
AN IMPROVED HOUSING FOR A HIGH PRESSURE CHAMBER IS DESCRIBED. THE PRIMARY RESISTANCE TO RADIAL PRESSURES DEVELOPED IN THE HIGH PRESSURE CHAMBER IS PROVIDED BY A HOUSING WHICH IS SPLIT INTO A NUMBER OF SEPARATE PIECES HAVING GAPS BETWEEN, THE GAPS BEING INCLUDED IN ONE OR
MORE CLOSED SPACES FILLED WITH PRESSURE SUPPORTING MATERIAL, I.E. MATERIAL WHICH ACTS AS A LIQUID AT HIGH PRESSURE, AND WHICH IS PRESSURIZED AS THE PRESSURE IN THE HIGH PRESSURE CHAMBER IS INCREASED.