Впервые методом 3D-печати получены образцы сетчатых сцинтилляционных керамических элементов сложной формы на основе граната Gd 3 Al 2 Ga 3 O 12 :Ce для использования в сцинтилляционных проточных детекторах α-, β- и γ-излучения в газообразных и жидких средах. Описан способ их получения, представлены результаты измерений выхода сцинтилляций при облучении α-частицами образцов керамических элементов, предложены пути улучшения их сцинтилляционных характеристик. Рассмотрена возможность их применения в негомогенных проточных сцинтилляционных ячейках, используемых в высокоэффективной жидкостной хроматографии. Отмечаются уникальные возможности технологии 3D-печати при создании детекторных элементов сложной формы с оптимизированной эффективностью.

The influence of the structure and properties of acrylate monomers on the rheology and polymerization of suspensions containing partially stabilized zirconium dioxide, a dispersant and a photoinitiator as a ceramic filler is investigated. It has been shown that the use of the DISPERBYK 2013 additive makes it possible to obtain suspensions containing 1,6-hexanediol diacrylate, dipropylene glycol diacrylate and tripropylene glycol diacrylate with a viscosity value below 5 Pa?s at high (up to 41 vol. %) filling with TZ-3YS-E powder. The possibility of using the obtained suspensions for three-dimensional printing of high-density ceramic products with complex geometry has been established.

The rheological characteristics of systems based on stabilized zirconium dioxide containing previously unused dispersing additives from BYK-Chemie, GmbH, have been studied to obtain photo-cured suspensions with properties that allow 3D printing of ceramic samples of complex shape by stereolithography. The suitability of the compositions has been demonstrated on prototypes of thin-walled ceramic crucibles for thermal analysis.

The rheological properties of highly concentrated suspensions consisting of nanocrystalline powders of zirconium oxide with monoclinic, tetragonal, and cubic modification (stabilized at molar content of yttrium oxide 4 and 8%) and liquid UV-photocured monomers of different nature were studied. The dynamic viscosity of the suspensions with the highest filling to 32% by volume was equal to 3 Pa · sec at shear rate 10 sec – 1 and of the order of 1 Pa · sec at 100 sec – 1 and 20°C.

We present a methodology of studying particle size distribution of Ce-doped YAG (yttrium aluminum garnet) powders by laser diffraction method based on the difference in the character of laser beam scattering by the particles of different size. Since the measurements are taken in a flow of dispersion medium, powder aggregation probably occurred during measurement procedure can result in overvaluation of the particle size in the distribution thus obtained. Different dispersion media (water, ethanol, isopropanol) and additives (Na salts and commercial surfactants) are used to lower powder aggregation. Most of the modified systems demonstrate reduced agglomeration of the particles during measurement procedure compared to standard «water - powder» dispersion system. The best and most stable results are obtained in isopropanol or water added with phosphate-based electrolyte which effectively prevent aggregation. Addition of surfactants appeared ineffective with regard to the stability of the results. Water with addition of sodium orthophosphate is proposed as the most convenient medium, in which dispersion is stable and all the components are readily available.

The method of slip casting is used to make dense ceramic crucibles of cerium-doped alumo-yttrium garnet. Use of the crucibles to heat-treat this material does not lead to its contamination at temperatures up to 1600°C. A laboratory technology for making the crucibles is described.

The investigating results are given for the mechanical and luminescent properties of the cerium-doped yttriumaluminum ceramic samples (Y 2,97 Ce 0,03 Al 5 O 12 ). The samples were manufactured out of the nanosturctured powder with the 50 nanometers primary particle size, which has been obtained by means of co-precipitation method, with subsequent pressing and sintering. Ill. 5. Ref. 20. Tab. 2.

Results are provided for a study of the mechanical and luminescence properties of aluminum-yttrium garnet ceramic specimens alloyed with cerium (Y2.97Ce0.03Al5O12). Specimens are prepared from nanostructured powder with a primary particle size of the order of 50 nm prepared by coprecipitation, compaction, and sintering.

The influence of the synthesis conditions (duration and accepted acoustic power, concentration of the precipitator and initial reagents) on the size and size distribution of Fe 3 O 4 nanoparticles was determined. The optimum ultrasonication time with a frequency of 35 kHz and an accepted acoustic power of 3.7 W for the synthesis of the nanoparticles with the narrowest size distribution is 5 min. The synthesized nanoparticles were characterized by scanning electron microscopy and X-ray diffraction analysis.

Coprecipitation is used to synthesize aluminum-yttrium garnet powder, activated with europium and alloyed with boron. The powder obtained may be used for manufacturing high-temperature functional ceramics. It is shown that addition of boron leads to intensification of particle growth and an increase in photoluminescence intensity. This is connected with the effect of boron on powder liquid-phase sintering mechanism.