A superhard insert for a machine tool, comprising a superhard cutter structure 20 defining a rake face 22, a flank 24 and a rounded cutting edge 26 formed by the transition between the rake face 22 and the flank 24; the flank 24 comprising a convex arcuate surface portion 28 extending away from the cutting edge 26, ...

Abstract A polycrystalline diamond (PCD) composite compact element 100 comprising a substrate 130  a PCD structure 120 bonded to the substrate 130  and a bond material in the form of a bond layer 140 bonding the PCD structure 120 to the substrate 130; the PCD structure 120 being thermally stable and having a mean...

A process is described for preparing metal hydroxides, hydroxyl organometals an white carbon. The purity and biocompatibiity of the thus obtained substances is such that they can be used for several applications, while being particularly suitable for use in Ayurvedic medicine. Specifically, this process involves an ...

A chemical vapour deposition (CVD) method for synthesizing diamond material on a substrate in a synthesis environment, said method comprising: providing the substrate; providing a source gas; dissociating the source gas; and allowing homoepitaxial diamond synthesis on the substrate; wherein the synthesis environment...

A method of manufacturing synthetic CVD diamond material the method comprising: providing a microwave plasma reactor comprising: a plasma chamber; one or more substrates disposed in the plasma chamber providing a growth surface area over which the synthetic CVD diamond material is to be deposited in use; a microwave...

A microwave plasma reactor for manufacturing synthetic diamond material via chemical vapour deposition the microwave plasma reactor comprising: a microwave generator configured to generate microwaves at a frequency f; a plasma chamber comprising a base a top plate and a side wall extending from said base to said top...

A microwave plasma reactor for manufacturing synthetic diamond material via chemical vapour deposition, the microwave plasma reactor comprising: a microwave generator configured to generate microwaves at a frequency f; a plasma chamber comprising a base, a top plate, and a side wall extending from said base to said ...

A PCD structure comprising a first region, in a state of residual compressive stress, and a second region in a state of residual tensile stress adjacent the first region; the first and second regions each formed of respective PCD grades and directly bonded to each other by intergrowth of diamond grains, the PCD grad...

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A method of producing a CVD diamond layer having a high colour, which is suitable for optical applications, for example. The method includes adding a gaseous source comprising a second impurity atom type to counter the detrimental effect on colour caused by the presence in the CVD synthesis atmosphere of a first imp...

Starting from a diamond material which shows a difference in its absorption characteristics after exposure to radiation with an energy of at least 5.5 eV (typically UV radiation) and thermal treatment at 798K, controlled irradiation is applied so as to introduce defects in the diamond material. After the controlled ...

A method of producing a single crystal CVD diamond of a desired colour which includes the steps of providing single crystal CVD diamond which is coloured and heal treating the diamond under conditions suitable to produce the desired colour. Colours which may be produced are. for example, in the pink-green range. ...

A CVD single crystal diamond material suitable for use in, or as, an optical device or element. It is suitable for use in a wide range of optical applications such as, for example, optical windows, laser windows, optical reflectors, optical refractors and gratings, and etalons. The CVD diamond material is produced b...

A diamond layer of single crystal CVD diamond which is coloured, preferably which has a fancy colour, and which has a thickness of greater than 1 mm.

A body of single crystal CVD (chemical vapour deposition) diamond particularly suitable as a wear resistant material for wear applications, such as wire drawing dies, graphical tools or stichels, or fluid jet nozzles. The diamond typically has a low wear rate, exhibits a low birefringence indicative of low strain an...

A method of producing a plate of single crystal diamond, having the steps of providing a diamond substrate, growing diamond homoepitaxially on a surface of the substrate by chemical vapour deposition (CVD) and severing the homoepitaxial CVD grown diamond and the substrate transverse to the surface of the substrate o...

A method of producing coated ultra-hard abrasive material, in particular coat diamond and CBN material. In a first step, an element capable of forming (sing or in combination) carbides, nitrides or borides to the surface(s) of the abrasion material is is applied using a hot coating process. At least one outer layer ...

A coated super-hard abrasive comprises a core of super-hard abrasive material which is typically diamond or cBN based, an inner layer of a metal carbide, nitric or carbonitride chemically bonded to an outer surface of the super-hard abrasi material and an outer layer of tungsten physically deposited on the inner lay...

A coated super-hard abrasive comprises a core of super-hard abrasive materii which is typically diamond or cBN based, an inner layer of a metal carbide, nitrid boride or carbonitride chemically bonded to an outer surface of the super-ha abrasive material and an outer layer of a metal carbonitride, in particular tita...

A layer of single crystal boron doped diamond produced by CVD and having a total boron concentration which is uniform. The layer is formed from a single growth sector, or has a thickness exceeding 100 (m, or has a volume exceeding 1 mm3, or a combination of such characteristics

A method of producing a single crystal CVD diamond of a desired colour which includes the steps of providing single crystal CVD diamond which is coloured and heat treating the diamond under conditions suitable to produce the desired colour. Colours which may be produced are, for example, in the pink-green range. ...

Single crystal diamond having a high chemical purity i.e. a low nitrogen content and a high isotopic purity i.e. a low 13C content, methods for producing the same and a solid state system comprising such single crystal diamond are described.

A solid state system comprising a host material and a quantum spin defect, wherein the quantum spin defect has a T2 at room temperature of about 300 µs or more and wherein the host material comprises a layer of single crystal CVD diamond having a total nitrogen concentration of about 20 ppb or less, wherein the surf...

A method of making fancy orange synthetic CVD diamond material is described. The method comprises irradiating a single crystal diamond material that has been grown by CVD to introduce isolated vacancies into at least part of the CVD diamond material and then annealing the irradiated diamond material to form vacancy ...

A method of introducing NV centres in single crystal CVD diamond material is described. One step of the method comprises irradiating diamond material that contains single substitutional nitrogen to introduce isolated vacancies into the diamond material in a concentration of at least 0.05 ppm and at most 1 ppm. Anoth...

A method of producing a grown single crystal diamond substrate comprising: (a) providing a first diamond substrate which presents a (001) major surface, which major surface is bounded by at least one <100> edge, the length of the said at least one <100> edge exceeding any dimension of the surface that is orthogonal...

A method of producing a CVD diamond layer having a high colour, which is suitable for optical applications, for example. The method includes adding a gaseous source comprising a second impurity atom type to counter the detrimental effect on colour caused by the presence in the CVD synthesis atmosphere of a first imp...

A single crystal CVD synthetic diamond layer comprising a non parallel dislocation array wherein the non parallel dislocation array comprises a plurality of dislocations forming an array of inter crossing dislocations as viewed in an X ray topographic cross sectional view or under luminescent conditions. ...

A method of incorporating a mark of origin, such as a brand mark, or fingerprint in a CVD single crystal diamond material, includes the steps of providing a diamond substrate, providing a source gas, dissociating the source gas thereby allowing homoepitaxial diamond growth, and introducing in a controlled manner a d...

A method of making fancy pale blue or fancy pale blue/green CVD diamond material is described. The method comprises irradiating single crystal diamond material that has been grown by a CVD process with electrons to introduce isolated vacancies into the diamond material, the irradiated diamond material having (or aft...