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Results of investigations into strengthening the nickel host in the diamond composite electro chemical coating (DCEC) with nanodispersed particles are reflected. Diamond nanopowders of the detona tion synthesis, which were introduced into the DCEC through the electrolyte, are applied as the strengthen ing phase. As a result, the microhardness of the nickel host increased by a factor of 3, while the durability of tubular drilling tools after the deposition of the diamond coating increased by a factor of 4. The developed technology can be used when producing a diamond tool for cutting stone, glass, and ceramic materials, as well as to produce correcting tools. Fig. 4. X ray diffraction pattern of nanodiamonds. Inten sity lines correspond to the phase of cF8/1 cubic diamond.

Various samples of multisectoral high‐pressure high‐temperature (HPHT) single‐crystal diamond plate (IIa type) (4 × 4 × 0.53 mm) are tested for particle detection applications. The samples are investigated by X‐ray diffractometry, photoluminescence spectroscopy, Raman spectroscopy, Fourier‐transform infrared, and visible/ultraviolet (UV) absorption spectroscopy. High crystalline perfection and low impurity concentration (in the {100} growth sector) are observed. To investigate detector parameters, circular 1.0 and 1.5 mm diameter Pt Schottky barrier contacts are created on {111} and {100} growth sectors. On the backside, a Pt contact (3.5 × 3.5 mm) is produced. The {100} growth sector is proved to be a high‐quality detector: the full width at half maximum energy resolution is 0.94% for the 5.489 MeV 226Ra α‐line at an operational bias of +500 V. Therefore, it is concluded that the HPHT material {100} growth sector is used for radiation detector production, whose quality is not worse than the chemical vapor deposition method or specially selected natural diamond detectors.