Features of Pulsed Laser Annealing of BC3 Films on a Sapphire Substrate

Technical Physics Letters - The morphology, chemical composition, microstructure, and electrical properties of BC3 thin films subjected to melting by a nanosecond laser pulse are investigated. The...     

Effect of some technical and technological parameters on the efficiency of ladle treatment of steel

The effect of the inert-gas blowing intensity, the arrangement of blowing bottom tuyeres, and the refining-slag thickness on the melt temperature during heating in a ladle-furnace unit is studied by computer simulation and upon full-scale experiments. A shift of the blowing holes from the vertical axis of the ladle and an increase in the slag thickness are found to decrease the rate of metal heating.     

Properties and preparation of amorphous chromium carbide electroplates

The electrochemical and corrosion behavior of chromium electroplates formed in sulfuric acid solutions of Cr(III) in the presence of oxalates was studied by measuring steady-state polarization curves in 0.5 M H₂SO₄ solution. These electroplates demonstrate no active dissolution region and their open-circuit potentials are located in the passivity region, i.e. shifted substantially in the positive direction as compared with those of metallurgical chromium and electroplates from standard chrome-plating baths. The results of X-ray photoelectron spectroscopy (XPS) studies evidence that the passive metal surface layer several nanometers thick consists of chromium oxides with incorporated carbides formed during electroplating. It is supposed that the peculiarities of the corrosion and electrochemical behavior of the deposits under study can be attributed to the presence in them of chromium carbides, which operate as cathodic agents. At the same time, the formation of these carbide compounds during the cathodic deposition of chromium electroplates from sulfuric acid Cr(III) solutions in the presence of sodium oxalate is a result of electrocatalytic activity of metal chromium. The latter assumption is confirmed by XPS analysis of surface layers formed during the exposure of chromium to sulfuric acid solutions containing organic substances.     

Characteristics of flow between a rotating and a static disk in the presence of radial flow

An improved method is proposed for the calculation of the flow in the gap between a rotating and a static disk in the presence of radial flow. The algorithm of the solution is realized on a Nairi-2 computer.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 32, No. 2, pp. 234–241, February, 1977.