Yu.S. Borisov

Modeling of motion and heating of powder particles in laser, plasma, and hybrid spraying

Mathematical models for simulation of motion and heating of fine ceramic particles in plasma and laser spraying, as well as under conditions of a new technological process, that is, hybrid laser plasma spraying, are proposed. Trajectories, velocities, and temperature fields of fine SiO2 particles being sprayed using the argon plasma jet, CO2 laser beam, and their combination have been calculated. It is shown that the space-time distribution of temperature in spray particles greatly depends on the spraying method.

Composite Ti-Si-C System Coatings

Abstract Composite Ti-Si-C system coatings consist of a siilicide matrix and hard carbide containing inclusions. Plasma spraying of the composite powders of desired composition provides coatings combining the high wear and corrosion resistance with a low friction coefficient.

TRANSITION METAL-NONMETALLIC REFRACTORY COMPOUND COMPOSITE POWDERS FOR THERMAL SPRAYING

The study was intended to establish the thermal spraying effectivity of composite povders consisting of transition metals (chrome, titanium, zirconium etc) and nonmetallic high-melting compounds (silioon carbide, boron carbide, silicon nitride, boron nitride). Coatings of these components interactions products (mixtures of carbides, silicides, and carbosilicides; borides and carbides; nitrides and silicides; borides and nitrides) show high wear and corrosion resistance; the synthesis process is exothermic.

Surface Modification of Iron Carbon Alloys by Plasma Detonation Treatment

Abstract Plasma detonation method (PDM) is based on the use of pulse plasma jets formed by transformation of a detonation wave into a plasma pulse. Energy density in such a jet amounts to 107 W cm−2, Consumable electrodes used here allow the vapors of various metals to be introduced into the jet. PDM is applied for heat treatment of surfaces, their alloying, as well as for coating deposition. The process of surface modification of carbon steels using various electrodes is investigated. The effect of the treatment conditions and the electrode materials on surface hardening is discussed.

Thermal Sprayed Aluminum-Silicon Alloy Coatings

Abstract Composite materials based on aluminum-silicon alloy were produced by the methods of flame, plasma, and high-velocity oxygen flame (HVOF) spraying. The effect of carbide and oxide additions on structure and properties of the coatings was studied.

Laser-Microplasma Reactive Powder Spraying of Titanium Coatings with Nitride Phases

One of the actual problems of modern surface engineering is to improve the wear and corrosion resistance of structural elements made of titanium and titanium alloys, which owing to a number of unique characteristics are becoming more widely used in industries such as aerospace, chemical engineering, medicine and many others. Promising way to improve the tribological characteristics as well as corrosion resistance in aggressive environments of such materials is the formation of titanium nitride layers on the surface. Titanium nitride is characterized by high hardness (up to 20000 MPa), wear resistance, chemical resistance and high refractory properties [1], which allows to significantly expand applicability and product lifetime of these materials.

Production of powders for thermal spraying of coatings by mechanical alloying and mechanochemical synthesis

Special features of the production of powders for thermal spraying of coatings by mechanical alloying and mechanochemical synthesis are described.

Producing powders for thermal spraying by mechanical alloying and mechanochemical synthesis

Special features of the production of powders for thermal spraying by mechanical alloying and mechanochemical synthesis are described.