A diamond-coated tool comprising a base material made of a cemented carbide and a diamond layer disposed on the base material, wherein when a cross section of the diamond layer along a normal line to a surface of the diamond layer is observed using a scanning electron microscope, the diamond layer has an average void area ratio of 0% or more and 0.2% or less in a region R surrounded by an interface S1 between the base material and the diamond layer and a virtual surface Q that is located at a distance of 5 μm from interface S1 toward a surface side of the diamond layer.

A non-planar chemical vapour deposition polycrystalline diamond body has a dome body having an apex and an outer periphery. The dome body has an average radius of curvature in a range of 4 mm to 25 mm and a maximum linear dimension at the outer periphery of the dome body of no more than 26 mm. The average radius of curvature is no less than 0.6 times the maximum linear dimension at the outer periphery. A method of fabricating the non-planar diamond body is also disclosed.

An electrochemical sensor unit including: a working electrode; and a counter electrode, wherein the working electrode includes a diamond film which generates a redox reaction on a surface when a voltage is applied between the working electrode and the counter electrode, and a support which is formed of a material different from diamond and supports the diamond film, when the working electrode is viewed laterally, in the support, a width of a surface opposite to a surface in contact with the diamond film is smaller than a width of the diamond film, and a liquid test sample is supplied to the working electrode from the diamond film side.

Provided is a hot filament CVD device capable of performing coating treatment on a base material while stably correcting slack of a filament due to thermal expansion. The hot filament CVD device includes a chamber, a base material support that supports multiple base materials, multiple filaments, a first frame, a second frame, a power source, a drive unit, a drive control unit, a calculation unit, and a temperature information acquisition unit. The temperature information acquisition unit acquires information on temperature of the multiple filaments, the temperature changing with application of voltage. The calculation unit calculates an amount of thermal expansion of the multiple filaments based on the acquired information on temperature. The drive control unit causes the second frame to move apart from the first frame in accordance with the amount of thermal expansion calculated by the calculation unit.

The present disclosure relates to methods and systems for producing structured carbon materials in a microgravity environment. A benefit of the methods and systems disclosed herein can include producing structured carbon materials having fewer defects and reducing excess carbon dioxide in an atmosphere by converting carbon dioxide from an ambient gas into a structured carbon material.

Provided is a hot filament CVD device capable of easily attaching, detaching, and replacing a filament. The hot filament CVD device includes a chamber, a base material support that supports multiple base materials, filament cartridges, and paired holding parts. The filament cartridges each include multiple filaments (60), a first frame, a second frame, and paired connecting members. The paired holding parts guide each of the filament cartridges when it is inserted into the chamber, and hold the filament cartridges in the chamber so that the filament cartridges face the multiple base materials.

An electrode for an ozone generator or chlorine generator includes an electrically conductive substrate, a doped-Si layer disposed over the conductive substrate, and a boron-doped diamond (BDD) layer disposed over the doped-silicon layer. The doped-silicon layer defines a discrete architecture that maintains adhesion throughout a high temperature CVD boron-doped diamond process. Another electrode having a PVD nitrogen-doped diamond (ta-C:N) layer disposed over a conductive substrate is also provided.

A cutting tool, including a silicon nitride (Si.sub.3N.sub.4) ceramic substrate, and a diamond film coated on the surface of the Si.sub.3N.sub.4 ceramic substrate. The diamond film has a thickness of 7-12 μm. The cutting tool includes a tool nose, a blade, and a handle. The blade has a rake angle γ of 5-15°, a clearance angle α of 10-14°, and a helix angle of 15-45°. The blade includes four cutting edges.

A diamond-coated tool includes: a substrate; and a diamond layer that coats the substrate, wherein the diamond layer includes a first region that is in contact with the substrate, the first region includes a region S1 surrounded by an interface P between the substrate and the diamond layer and an imaginary plane V1 separated from the interface P by a distance of 2 μm, and the region S1 has crystal grains grown in random directions.

The present disclosure provides a diamond formed of a single crystal diamond consisting of carbon and tantalum with unavoidable impurities, and having a tantalum content in a range of 10.sup.18 to 10.sup.21 atoms/cm.sup.3, wherein the diamond has a black appearance.