[en] A coating technology for application of hardening of diamond coatings on carbide tools for treatment of mineral fiberglass based on quartz texture with chromate-phosphate cohesive (FQTCC) is proposed. The purpose of this development is to increase the edge strength of the tool. The use of the technology described above allowed, in comparison with the cutter without diamond coating, to increase the productivity of processing by 11.5 times, by cutting speed by 2.3 times, and by the minute supply by 5.0 times. The approach is based on changing the configuration of the microwave field when applying a diamond coating on hard alloy substrates in the microwave plasma of the ARDIS-100 reactor by using specially designed plateholders. This method allows for the group coating on several substrates in a single process. A simplified mathematical model for calculating the temperature of the top of the cutter during the growth of a CVD diamond film, taking into account heat transfer through thermal conductivity and radiation, has been constructed. Temperature distribution on the surface of a tungsten carbide cutter in the temperature range optimal for diamond growth was constructed. The difference between the average (experimental) and maximum (calculated) temperature in such a cutter was from 80 to 138°C. (paper)

[en] Raman and fluorescence spectroscopic techniques were used to study doped nanodiamonds synthesized at high pressure and high temperature (HPHT technique) and by chemical vapor deposition from the gas phase (CVD technique). For the CVD diamonds, a hundred-fold increase in fluorescence intensity of the silicon-vacancy centers normalized to the volume of the probe material was observed with an increase in synthesized diamond particle diameter from 150 to 300 nm. Graphitization temperature upon heating in the air significantly lower than for detonation nanodiamonds was found for the boron-doped HPHT nanodiamonds.

[en] We demonstrated a laser beam profiling method based on imaging of the laser induced photoluminescence of a transparent single-crystal diamond plate. The luminescence at 738 nm is caused by silicon-vacancy color centers formed in the epitaxial diamond film by its doping with Si during CVD growth of the film. The on-line beam monitor was tested for a cw laser emitting at 660 nm wavelength. (letter)

[en] We produced a nanocarbon colloid by electro-spark discharge as substrate seeding for microwave plasma-assisted chemical vapor deposition (MPACVD) synthesis of micro- and nano-crystalline diamond films and solid free-standing microcrystalline diamond plates. The colloid was produced by a specially designed device via a pulse electro-spark discharge in ethanol. The nanocrystalline diamond films and polycrystalline plates that were grown were examined by optical, SEM and TEMmicroscopies and Raman spectroscopy. (paper)