A diamond polycrystal includes diamond grains, the diamond polycrystal including a cubic diamond and a 6H type hexagonal diamond, wherein the cubic diamond and the 6H type hexagonal diamond exist in the same or different diamond grains, and a ratio Ab.sub.1/Ab.sub.2 is more than or equal to 0.4 and less than or equal to 1, Ab.sub.1 representing a maximum value of absorption in a range of more than or equal to 1200 cm.sup.−1 and less than or equal to 1300 cm.sup.−1 in an infrared absorption spectrum, Ab.sub.2 representing a maximum value of absorption in a range of more than or equal to 1900 cm.sup.−1 and less than or equal to 2100 cm.sup.−1.

The present invention provides a preparation method of amorphous GeH, and belongs to the field of preparation technologies of amorphous GeH. The preparation method provided in the present invention includes the following step: sealing crystalline GeH, a pressure calibration object, and a pressure transmitting medium in a cavity of a diamond anvil cell, and adjusting pressure in the cavity to obtain amorphous GeH. In the present invention, pressure is applied to the GeH in the sealed diamond anvil cell, to implement amorphization of the GeH at room temperature. In this way, impurities can hardly be found in the preparation method, and pure amorphous GeH can be obtained. In addition, the method provided in the present invention has simple operations and good repeatability.

A diamond polycrystal includes diamond grains, the diamond polycrystal including a cubic diamond and a 6H type hexagonal diamond, wherein the cubic diamond and the 6H type hexagonal diamond exist in the same or different diamond grains, and a ratio Ab.sub.1/Ab.sub.2 is more than or equal to 0.4 and less than or equal to 1, Ab.sub.1 representing a maximum value of absorption in a range of more than or equal to 1200 cm.sup.1 and less than or equal to 1300 cm.sup.1 in an infrared absorption spectrum, Ab.sub.2 representing a maximum value of absorption in a range of more than or equal to 1900 cm.sup.1 and less than or equal to 2100 cm.sup.1.

Systems and methods include a computer-implemented method for manufacturing a binder for spraying onto tools. A binder is manufactured for binding compacts onto a tool substrate. The binder is designed to provide a coating strength on the tool substrate. The binder includes: a metal selected from iron (Fe), cobalt (Co), and nickel (Ni); an alloy including the metal selected from Fe, Co, and Ni; or a refractory alloy selected from tungsten, tantalum (Ta), molybdenum (Mo), and niobium (Nb). An ultra-high-pressure, high-temperature operation is performed on pure wurtzite boron nitride (w-BN) powder to synthesize w-BN and cubic boron nitride (c-BN) compact. A binder-compact mixture is produced by turbulently mixing the binder with the compact in a mixer within a vacuum. The binder-compact mixture is thermally sprayed onto a tool substrate to coat the tool.

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.

An apparatus for the manufacture of synthetic diamonds includes a pressure vessel having a chamber therein, and a body located in the chamber. The pressure vessel and the body are formed of materials having different coefficients of expansion. The coefficient of expansion of the body is greater than the coefficient of expansion of the pressure vessel. The pressure vessel is formed from a material having a melting point in excess of 1327 C. and capable of withstanding a pressure of at least 4.4 Gpa at a temperature of at least 1327 C. The chamber is configured to receive the body, and a carbon source, the apparatus further comprising a heating means configured to heat at least the body to a temperature at least of 1327 C. The coefficient of expansion of the body is selected such that upon heating thereof to at least 1327 C. the pressure exerted on the carbon source is at least 4.4 Gpa.

A polycrystalline diamond construction comprising a body of polycrystalline diamond material formed of a mass of diamond grains exhibiting inter-granular bonding, wherein between around 50 wt % to around 99 wt % of the diamond grains in a cross-section of the body of polycrystalline diamond material taken at any orientation have a sectorial growth structure. A method of making the polycrystalline diamond construction is also disclosed.

Methods of forming polycrystalline diamond compacts include employing field assisted sintering techniques with high temperature and high pressure sintering techniques. For example, a particle mixture that includes diamond particles may be sintered by subjecting the particle mixture to a high temperature and high pressure sintering cycle, and pulsing direct electrical current through the particle mixture during at least a portion of the high temperature and high pressure sintering cycle. The polycrystalline diamond compacts may be used to form cutting elements for earth-boring tools. Sintering systems are configured to perform such sintering processes.

Assemblies as disclosed herein for making superhard products by HPHT process comprise a first can portion for accommodating a mixture of materials therein and a second can mated with the first can portion. A leak-tight seal is provided between the first can portion and second can portion in a manner that accommodates the manufacture of relatively longer superhard products without having to change other elements or members used for HPHT processing to thereby provide improved manufacturing flexibility and cost efficiency.

A synthetic block for optimizing the performance of diamonds and gemstones is provided, including: a sealing material, a thermal insulation material, conductive materials, and a heating material. The conductive materials are provided at both ends of the sealing material. The heating material abuts between the conductive materials, and a high-temperature and high-pressure area is formed inside the heating material. The thermal insulation material includes a first thermal insulation tube and a second thermal insulation tube that are sequentially telescoped the conductive materials. The first thermal insulation tube abuts on an outer wall of the heating material, the second thermal insulation tube is provided between the sealing material and the first thermal insulation tube, a height of the second thermal insulation tube is greater than that of the first thermal insulation tube, and the synthetic block is square.