Abstract: 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 plate defining a resonance cavity for supporting a microwave resonance mode between the base and the top plate; a microwave coupling configuration for feeding microwaves from the microwave generator into the plasma chamber; a gas flow system for feeding process gases into the plasma chamber and removing them therefrom; a substrate holder disposed in the plasma chamber and comprising a supporting surface for supporting a substrate; and a substrate disposed on the supporting surface, the substrate having a growth surface on which the synthetic diamond material is to be deposited in use, wherein the substrate dimensions and location within the resonance cavity are selected to generate a localized

Abstract: The invention relates to a speaker dome comprising: a polycrystalline diamond dome body formed of a material of high stiffness with a Young's modulus greater than 50 GPa and having respective inner and outer surfaces; and a coating on at least one side of the dome body, wherein the coating comprises an optically refractive metal compound layer which is semi-transparent and which forms one or more colours via interference of reflected light from front and rear surfaces of the layer. The invention also relates to a diamond component comprising: a diamond body; and a coating on at least one side of the diamond body; wherein the coating comprises at-least two layers including a first layer bonded to the at least one side of the diamond body and a second layer disposed over the first layer, the second layer being an optically refractive metal compound coating which is semi-transparent and which forms one or more colours via interference of reflected light from front and rear surfaces of the second layer.

Abstract: A bipolar cell for a reactor for treatment of electrolyte such as waste water and effluent or for electrosynthesis comprises end electrodes and at least one bipolar electrode therebetween. The or each bipolar electrode comprises a diamond sheet. The cell includes a porous support structure, for example in the form of spacers, a lattice of plastic rods, or a woven mesh, between each end electrode and the adjacent diamond sheet, there being porous support structure between the or each pair of adjacent diamond sheets, the support structures acting to contact or support the or each diamond sheet.

Abstract: A method of forming an instrumented cutting element comprises forming a free standing sintered diamond table having at least one chamber in the free standing sintered diamond table, providing a doped diamond material within the at least one chamber, and attaching a substrate to the free standing sintered diamond table to form an instrumented cutting element. The instrumented cutting element includes the doped diamond material disposed within the sintered diamond table on the substrate. A method of forming an earth-boring tool comprises attaching at least one instrumented cutting element to a body of an earth-boring tool. The at least one instrumented cutting element has a diamond table bonded to a substrate. The diamond table has at least one sensing element disposed at least partially within the diamond table. The at least one sensing element comprises a doped diamond material.

Abstract: (EN): A microwave power delivery system for supplying microwave power to a plurality of microwave plasma reactors (8), the microwave power delivery system comprising: a tuner (14) configured to be coupled to a microwave source (4) and configured to match impedance of the plurality of microwave plasma reactors to that of the microwave source; and a waveguide junction (18) coupled to the tuner and configured to guide microwaves to and from the plurality of microwave plasma reactors, wherein the waveguide junction comprises four waveguide ports including a first port coupled to the tuner, second and third ports configured to be coupled to respective microwave plasma reactors, and a fourth port coupled to a microwave sink (20), wherein the waveguide junction is configured to evenly split microwave power input from the tuner through the first port between the second and third ports for providing microwave power to respective microwave plasma reactors, wherein the waveguide junction is configured to decouple the se

Abstract: An earth-boring drilling tool comprises a cutting element. The cutting element comprises a substrate, a diamond table, and at least one sensing element formed from a doped diamond material disposed at least partially within the diamond table. A method for determining an at-bit measurement for an earth-boring drill bit comprises receiving an electrical signal generated within a doped diamond material disposed within a diamond table of a cutting element of the earth-boring drill bit, and correlating the electrical signal with at least one parameter during a drilling operation.

Abstract: A component that is rigid and three-dimensional and has a relatively low mass. The component has a foil body formed of a metal or metal alloy matrix that is embedded with ultra-hard particles or grit, such as diamond and/or cBN. It can be used in applications where a combination of high rigidity and low mass is required, such as in audio applications, for example.

Abstract: The invention concerns a composite diamond window (10) which includes a CVD diamond window pane (12) which is mounted to a CVD diamond window frame (14). The frame (14) is thicker than the pane (12) and has a radiation transmission aperature (16) therein across which the pane spans.

Abstract: The invention concerns a composite diamond window (10) which includes a CVD diamond window pane (12) which is mounted to a CVD diamond window frame (14). The frame (14) is thicker that the pane (12) and has a radiation transmission aperature (16) therein across which the pane spans.

Abstract: A window for a waveguide for a beam of electromagnetic radiation. The window includes a layer of a material capable of allowing electromagnetic radiation to pass therethrough and a support on each side of the layer. Each support defines a passage for electromagnetic radiation. Further, the layer is provided with at least one recess formed in the periphery thereof.