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Article
Structural-Phase State and Mechanical Properties of a Laser Cladding Titanium Matrix Composite Based on Ti64 Alloy and TiB2 Ceramics
The paper presents experimental studies on laser cladding synthesis of a titanium matrix composite based on Ti64 titanium alloy and TiB2 ceramic reinforcement. The weight percentage of TiB2 ceramics in the compos...
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Article
INFLUENCE OF SUBSTRATE PREHEATING ON THE STRUCTURAL AND PHASE COMPOSITION OF A NICKEL-BASED CERMET COATING
The deposition process of a nickel-based cermet coating with a high (60 wt.%) mass content of tungsten carbide was investigated. The results showed preheating the substrate to 500°C prevented the formation of ...
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Article
EFFECT OF SUBSTRATE PREHEATING ON THE CERMET COATING STRUCTURE OBTAINED USING ADDITIVE TECHNOLOGIES
This paper is devoted to the influence of substrate preheating on the structure of cermet coatings made of TI–6AL–4V alloy reinforced with B4C particles using direct metal deposition. Coatings with a 15% mass fra...
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Article
Critique of Yakov Zeldovich’s “The Theory of Ignition by a Heated Surface”: Self-Ignition of an Infinite Combustible by Heated Bodies
The basic principles of a thermal explosion had been studied and published by 1980. It seemed that the research was completed, but later it was discovered that Zeldovich’s “ignition condition” does not correla...
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Article
Quantum Chemical Analysis of the Electronic Spectra of Molecular, Ionic, and Zwitterionic forms of 1-Amino- and 1-(N-Phenyl)Aminonaphthalene-8- Sulfonic Acids
Geometric and electronic structures of molecular (AH), cationic \((\text{AH}_{2}^{+})\) , zwitterionic (A–H+), and ani...
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Article
Synthesis of Ni–Cu Solid Solutions by Precipitation in the Supercritical CO2 Medium
The effect of precipitation conditions of acetate precursors in the supercritical СО2 medium (temperature, pressure, solvent composition) for the synthesis of mixed Ni–Cu systems is studied. Synthesized samples a...
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Article
The Effect of TiN Nanoparticles on the Structure and Mechanical Properties of the Porous–Solid Steel Joint Formed by Laser-Beam Welding
Abstract—The formation of a crystal structure and properties of a welded joint between a porous stainless steel plate and a solid plate of greater thickness with the use of nanomodifying additives has been experi...
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Article
In-Situ Reactions during Direct Laser Deposition of a Functionally Gradient Ti64-B Composite
The paper presents the results of experimental studies on the synthesis of a metal-matrix composite by direct laser deposition, including the assessment of optimum irradiation modes to make such a material fre...
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Article
Microstructure and Mechanical Properties of a (TiB + TiB2 + TiC)/Ti–6Al–4V Composite Material Formed in the Process of in situ Synthesis in Selective Laser Melting
A study has been made of the physicomechanical properties of a heterogeneous material based on TiB, TiB2, TiC, and B4C ceramics and a Ti–6Al–4V metal alloy formed by the method of selective laser melting. Conside...
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Article
Experimental Investigation of the Effect of Laser Treatment on the Resistance of a Cermet Coating to a High-Speed Impact
For the first time, experimental investigations of the resistance of a cermet coating formed by a combined method (cold gas-dynamical spraying with subsequent laser treatment) to high-speed impact was carried ...
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Article
Optimization of the Parameters of Additive Growing of Functionally Heterogeneous Nickel-Based Materials
Optimization of the parameters of laser cladding of an N85Yu15 nickel-alumide powder to obtain single tracks has been carried out. In the course of the experiment, the authors changed the laser-radiation power...
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Article
Formation of the Structure and Mechanical Properties of Rolled Products for Upsetting Automotive Metal Products
Abstract—To improve the quality of metal products, enterprises are forced to seek reserves at all positions of the technological chain of transformation of an initial rolled metal. The maximum effect is achieved ...
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Article
Experimental Investigation of the High-Rate Interaction of a Cloud of Microparticles with a Metal with the Use of a Rail Accelerator
A new electrodynamic method of deposition of microparticles of a solid material (tungsten carbide) on the surface of a steel target is considered. A tungsten carbide powder enclosed in a plastic container was ...
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Article
A Mathematical Theory of Ignition by an Incandescent Surface
In the theory of ignition, the criterion obtained by Ya.B. Zeldovich in 1939, which made it possible to calculate the parameters of some ignition processes approximately, became widely known. In 1984, one of t...
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Article
STUDY OF PHYSICAL PROPERTIES OF TiC–NiCr CERMET COMPACTS OBTAINED BY HOT PRESSING
Results of an experimental study of physical properties, microstructure, and phase composition of a TiC–NiCr cermet compact obtained by hot pressing are presented. It is shown that an increase in the volume fr...
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Article
Laser Welding of Heterogeneous Materials Ni-Fe-Cu and Fe-C-Mn-Si for Production of Drilling Tools
A technology has been developed for laser welding of dissimilar materials based on the Ni-Fe-Cr and Fe-C-Mn-Si systems, which can replace the technology of brazing joints between a diamond unit and a steel tub...
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Article
CREATION OF A HETEROGENEOUS MATERIAL BASED ON THE TITANIUM ALLOY AND TITANIUM BORIDE BY SELECTIVE LASER MELTING
Results of theoretical and experimental investigations of physical and mechanical properties of a heterogeneous material based on the TiB ceramics and Ti–6Al–4V metallic alloy obtained by means of selective la...
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Article
Long-Term Consequences of the Effect of Copper and an Electromagnetic Field on the Size and Weight Parameters and Activity of Digestive Glycosidases in Underyearlings of Roach Rutilus rutilus
The long-term (postponed) consequences of the separate and combined effects of Cu2+ ions (0.001, 0.01, and 0.1 mg/L) and a low-frequency electromagnetic field (50 Hz, 10 μT) on roach Rutilus rutilus (L.) embryos ...
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Article
Formation of B4C – Ti-6Al-4V Cermet Coatings by the Method of SLM
The process of formation of a multilevel multilayer B4C – Ti-6Al-4V cermet coating by the method of SLM is studied. The coating is characterized by presence of heterogeneous zones differing in the mechanical prop...
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Article
A Review of Methods for Studying the Elastic Characteristics of Nanoobjects
This work is an overview of studies on the determination of the elastic characteristics of nanomaterials published over the past 20 years in peer-reviewed Russian journals. It is known from the liter...
