A method for manufacturing a plurality of synthetic single crystal diamonds, the method comprising: forming a plurality of seed pads, each seed pad comprising a plurality of single crystal diamond seeds anchored to, or embedded in, an inert holder; loading a carbon source, a metal catalyst, and the plurality of seed pads into a capsule; loading the capsule into a high pressure high temperature (HPHT) press; and subjecting the capsule to a HPHT growth cycle to grow single crystal diamond material on the plurality of single crystal diamond seeds, the HPHT growth cycle comprising: initiating HPHT growth of single crystal diamond material on the plurality of single crystal diamond seeds by increasing pressure and temperature; maintaining HPHT growth of single crystal diamond material on the plurality of single crystal diamond seeds via a pressure driven growth process by controlling and maintaining pressure and temperature; and terminating HPHT growth of single crystal diamond material on the plurality of single crystal diamond seeds by reducing pressure and temperature, wherein the plurality of single crystal diamond seeds remain anchored to, or embedded in, the inert holders during the HPHT growth cycle.

Methods for forming cutting elements comprising polycrystalline materials, methods for forming polycrystalline compacts for cutting elements of a drilling tool, methods for forming polycrystalline diamond compacts, and resulting polycrystalline compacts and cutting elements are disclosed. Grains of a hard material are introduced to a press and subjected to a high-pressure, high-temperature (HPHT) process to sinter the grains. The system conditions (i.e., temperature and pressure) are then adjusted past a phase or state change point, after which, at least one of the system conditions is held during an anneal stage before the system conditions are adjusted to final levels. The resulting compacts and cutting elements may therefore include inter-granularly bonded hard material grains with a more stable microstructure (e.g., less stressed microstructure) than a polycrystalline compact and cutting element formed without an anneal stage during the HPHT process.

In an embodiment, a cell assembly for use in a high-pressure cubic press may include at least one can assembly containing a diamond volume. The at least one can assembly may include an end surface in proximity to the diamond volume. The cell assembly may include at least one heating element including a major surface generally opposing and positioned adjacent to the end surface of the at least one can assembly. The at least one heating element may be positioned and configured to heat the diamond volume. The cell assembly may include at least one pressure transmitting medium extending about the at least one can assembly, and a gasket medium that defines a receiving space configured to receive the at least one can assembly, the one or more heating elements, and the at least one pressure transmitting medium.

HPHT press system includes a thermal insulation layer. The thermal insulation layer includes CsCl, CsBr, CsI, or a combination thereof, and the thermal insulation layer is electrically insulating. The thermal insulation layer may include a thermal insulation sleeve and/or a thermal insulation button for an HPHT cell.

A method capable of obtaining pure single phase hexagonal diamond in an industrially usable size (bulk) is provided. Highly oriented and highly crystallized graphite having a mosaic spread of 5 or less is used as a starting material, and is subjected to a temperature ranging from 1000 to 1500 C. at a pressure ranging from 20 to 25 GPa. The size of the bulk sintered body of pure single-phase hexagonal diamond obtained by this method depends on the size of the starting graphite. However, as long as the pressure and temperature can be entirely provided (i.e., as long as the adequate high pressure and temperature are applied to the sample chamber of high pressure apparatus), any desired size can be obtained.

Disclosed herein is an apparatus and method for growing a diamond. The apparatus for growing a diamond comprises: a reaction cell that is configured to grow the diamond therein; a main heater including a main heating surface that is arranged along a first inner surface of the reaction cell; and a sub-heater including a sub-heating surface that is arranged along a second inner surface of the reaction cell, the second inner surface being non-parallel with the first inner surface.

A cartridge assembly having a chamber for containing hydraulic fluid, an intensifier element capable of reciprocating in the chamber and displacing the hydraulic fluid responsive to a drive system acting on the intensifier element, and a piston capable of reciprocating in the chamber and being displaceable responsive to a change in the pressure of the hydraulic fluid. The cartridge assembly is configured so that when the pressure in the fluid increases responsive to a first force being applied by the drive system on the intensifier, the hydraulic fluid will exert a second force on the piston, the second force being greater than the first force; the mass of the hydraulic fluid being substantially conserved within the cartridge assembly.

Luminescent diamond is made subjecting a volume of diamond grains and catalyst material to high-pressure/high-temperature (HPHT) conditions. A pressure apparatus and/or a pressure cell is specially configured to impose a differential or asymmetric pressure onto the diamond volume during the HPHT conditions. This subjects the diamond grains to differential strain that increases the degree of plastic deformation of the diamond grains to increase the formation of nitrogen vacancy centers. Diamond pellets formed by such process and subjected to differential pressure can have an aspect ratio, or an aspect ratio change, of greater than one. The temperature of the HPHT process is 1.800? C. or less to facilitate desired nitrogen migration to preferentially promote formation of NV centers over NVN and N3 centers in the diamond pellets to provide a degree of luminescence in a red wavelength spectrum greater than diamond pellets formed by some other HPHT processes.

The invention relates to a method for obtaining synthetic diamonds from sucrose, and to a device for carrying out said method, the method comprising: introducing sucrose or a solution of water and sucrose into a hermetic capsule without air, which is surrounded by an external container that keeps the volume of the capsule constant during the entire process; increasing the pressure inside the capsule by breaking down the sucrose inside the capsule, either by increasing the temperature or by combining the sucrose with sulfuric acid, until the carbon resulting from said pressure conditions of the capsule is transformed into diamond; and controlling the pressure generated inside the capsule, using containing means that apply pressure externally around the container of the capsule. In addition, extra carbon is added, increasing the dimensions of the diamond.

A pressure booster having two cylinders with two pistons, connected such that they operate simultaneously, which can be mounted in a multi-chamber containing simple pressure boosters nested that can be used to increase the pressure depending on the simple boosters being used is provided.