The state of the art and prospects of detonation-synthesis nanodiamond applications in Belarus

Technological features of the commercial production of detonation-synthesis nanodiamonds at the SINTA Joint-Stock Company and the characteristics of the nanodiamonds and diamond-containing mixtures produced are considered. Nanodiamond applications in the production of composite electrolytic coatings that are based on chromium, nickel, gold, and silver, exhibit good service properties, and save on the use of noble metals and electric power are exemplified. Nanodiamond applications for the modification of plastics, antifriction lubricants, and oxide coatings grown by microarc oxidation of aluminum alloys are also considered. The prospective application of nanodiamonds as a raw material in the synthesis of diamond powders and superhard composites by static and shock-wave loading is demonstrated.     

Influence of the properties of an oxide film on the oxidation of aluminium powders

The structure of oxide films of aluminium powders has been established to depend on the size of its particles. The temperature dependence of the oxidation of the powder in air is ascribed to changes in both the structure of the oxide laver and the pressure of saturated aluminium vapor. The porous, permeable product consists of hollow microspheres of -Al₂O₃.

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. , . , –Al₂O₃.

     

Upconversion Luminescence of Er3+ Ions from Barium Titanate Xerogel Powder and Target Fabricated by Explosive Compaction Method

Journal of Applied Spectroscopy - Photo- and cathodoluminescence in the visible range from erbium-doped barium titanate xerogels obtained in the form of a powder and a target pressed from it by...     

Preparation of the iron carbide-fullerene black nanostructured composite coating on the steel-45 surface

Fullerene black at 1150°C interacts with the surface of iron to form a nanostructured composite coating consisting of orthorhombic iron carbide crystallites of 60–100 nm size and dispersed islands of fullerene black. In the process of formation of the composite coatings both the fullerene black with a particle size of 40–50 nm and the carbon oxide formed in the process were involved. Under the conditions of the process, the content of hydrogen and oxygen in the structure of fullerene black decreased, straightening out curved surfaces occurred, and appeared a system of aromatic conjugation.     

Compaction of nanodiamonds produced under detonation conditions and properties of composite and polycrystalline materials made on their basis

It is believed that materials based on ultrafine (nanoscale) diamond powders can possess high-level physical-mechanical and performance parameters characteristic of a nanocrystalline state. In certain cases, however, conventional methods for compacting ultrafine-dispersed diamonds (UDDs) fail and cannot be used to fabricate materials with desired properties. The difficulties associated with the ultrafine-dispersed state of the initial diamond powders can be surmounted by modifying the chemical and phase composition of the UDD surface. The possible use of UDDs as a catalyst that is conductive to the occurrence of chemical and phase transformations in certain substances at high pressures is analyzed. Sintering UDDs in the region of metastability of diamond makes it possible to produce porous polycrystalline aggregates with large specific surface area and very hard transparent particles.