Films based on the phases in the Si-C-N System: Part 1. Synthesis and characterization of bis(trimethylsilyl)ethylamine as a precursor

The characterization of bis(trimethylsilyl)ethylamine was carried out using a combination of IR, UV, ¹H, ¹³C, ²⁹Si, and ¹⁵N NMR spectroscopy, as well as elemental analysis. The spectral characteristics of the compound were determined. The temperature dependence of the saturated vapor pressure was established by tensimetric studies, and the thermodynamic characteristics of vaporization were calculated. Thermodynamic simulation of the chemical vapor deposition was performed and was used as a basis for predicting the composition of the deposited phase complexes depending on the type of reagent and the process conditions.     

The motion of a manifold of finely dispersed liquid droplets in the counterflow of high-temperature gases

The motion of a manifold of liquid droplets in the counterflow of high-temperature (above 1000 K) gases has been experimentally studied for variable initial size (0.01–0.05 mm) and velocity (0.1–0.5 m/s) of droplets and the gas flow velocity (0.1–2 m/s). The properties of gas-vapor-droplet mixtures were monitored by optical diagnostic techniques. Conditions under which the trajectories and velocities of droplets moving in a high-temperature gas counterflow exhibit significant changes are determined.     

Electroplating kinetics of cadmium from γ-butyrolactone-containing aqueous perchlorate electrolytes

γ-butyrolactone (GBL) is found to act as an inhibitor of an electrode reaction in a broad concentration range. The deceleration of the discharge of Cd²⁺ ions in the ranges of the structure stability of water and nonaqueous component is determined by the adsorption of the electrochemically active substance formed in the surface layer and caused both by the blockade of the cathode surface and the shift in the Φ′ potential at the adsorption of positively charged complexes. The lowest rate of the electrode reaction is observed in the mixtures with the least compact structure under conditions when sufficiently strong Cd²⁺-butyrolactone complexes are predominantly involved in the electrode reaction, and their discharge is preceded by their impelled dissociation on the electrode surface as they penetrate via the adsorption layer formed by organic molecules.     

Thermal stability of nickel structure obtained by high-pressure torsion in liquid nitrogen

Using transmission electron microscopy and durometry, the structural evolution of commercially pure nickel (99.6%) under high-pressure torsion (HPT) in liquid nitrogen and subsequent annealings in the temperature range 100–400°C has been investigated. In this nickel, at cryogenic temperature, HPT gives rise to a nanocrystalline structure with the record high microhardness (6200 MPa) and average crystallite size ～80 nm. The obtained structure is stable at room temperature and possesses a relatively low thermal stability, since recrystallization occurs at lower temperatures than after conventional deformation or HPT at room temperature.     

Structural changes accompanying color center formation in lithium fluoride exposed to femtosecond laser pulses

This paper examines structural changes produced in crystalline LiF by high-power femtosecond laser pulses and provides some insight into the mechanisms of structural damage to the material. In the region of the onset of multiple femtosecond laser beam filamentation and in the central part of the filaments, we observed partial melting of the material, cracking, and the formation of structural nanodefects that showed up as step pyramids and nanogratings in atomic force microscopy images.     

Application of Acoustic Pulse Reflectometry in Nondestructive Testing of Heat Exchanger Pipes

Chemical and Petroleum Engineering - The article presents the results of three years of work with a PACT-04 device for detecting defects of inner section of pipes by acoustic pulse reflectometry in...     

Software for Simulation of Low-Speed Machining

Russian Engineering Research - Software for the simulation of low-speed machining based on the SolidWorks and Deform-3D CAD/CAE systems is analyzed. The following properties are established: the...