Search results

In this study the structure and properties of surface layers obtained on cp-titanium workpieces by non-vacuum electron beam cladding of titanium carbide powder were investigated.
One of the promising techniques of titanium tribological properties improvement is the formation of hard coatings containing high-strength titanium carbide particles.
The high power beam injected to the atmosphere allows fabricating thick (up to 2 mm) high-quality coatings [11] without sacrificing properties of a base material.
Remy,  Mechanical, structural and tribological properties of titanium nitrided by a pulsed laser, Surf.
Li, Microstructure and Mechanical Properties of an in situ Synthesized TiB and TiC Reinforced Titanium Matrix Composite Coating, J.

These results show that the electrical properties can be improved by control of the microstructures.
The electro-mechanical coupling factor and piezoelectric constant of NKN-5LT ceramics were improved in the samples with A-site ions excess NKN-5LT.
Electrical properties of K2O excess NKN-5LT ceramics.
These results show that the electrical properties can be improved by control of the microstructures.
The excellent piezoelectric and electromechanical properties in modified NKN-5LT ceramics indicate that this system is potentially good candidate as lead-free material for a wide range of electro-mechanical transducer applications.

The advantages of squeeze casting include elimination of gas and shrinkage porosity, reduction of metal wastage and improvement of mechanical properties.
The results indicate that the properties of the SiCp/Al composites depends on the particle volume fraction and are greatly improved by hot extrusion, while, the extrusion ratio does not affect the properties of the extruded composites.
Because of the addition of the aluminum powder in the preform, some Al2O3 phases were introduced in the SiCp/Al composite, which affects the properties of the composite.
The mechanical behavior of a composite is affected by the presence of reinforcement particles dispersed in matrix material.
The yield strength of the matrix in the extruded composite may, in fact, be higher than that in the as-cast composite because of factors such as increased dislocation density and reduced grain size.

In modern construction, the use of fine-grained concrete (FGC) is due to its special properties compared to traditional heavy concrete.
The third factor ‒ the content of the chemical additive does not directly affect the strength of the FGC, since its task is to regulate the W/C.
Factor х3 (plasticizer) also significantly affects the density; a coefficient b33 = –53.66 indicates the presence of an optimal area.
Dvorkin, Design prediction of properties and design of concrete compositions, М.: Infra Engineering, 2016
Dvorkin, Physico-mechanical properties of activated cement-ash binders, Concrete Technology, 2010, no. 11-12, pp. 35-37

Abrasion results in the conjugating clearance of the parts increasing, which affects the machine precision, and shorten serving life of the machine.
Ion nitrocarburizing technics may enhance obviously the friction reduction, wear resistance and scuffing resistance properties of the substance by preparing the ion nitrocarburized layer on the surface of the part[5-9].
The friction and wear properties were investigated on a SRV–4 friction and wear tester.
The friction factors were real time noted by random software.
The above analyses show that at different temperature the friction factors of ion nitrocarburized layer is always less than that of the plain surface, and especially at 150 ˚C the friction factor of ion nitrocarburized layer reduces about 36% than that of the plain surface, which explains that at higher temperature ion nitrocarburized layer may greatly improve the friction reduction property of the substrate.

Introduction It is known that one of the main factors that determine the reliability of machine parts during their operation is their fatigue strength.
Stretching of the samples to determine the mechanical properties of metals was carried out on a tensile power machine Tinius Olsen H100KU.Investigation of the structure of metals and fracture surfaces was performed on a JSM-3U scanning microscope.
An increase in the number of parameters at the input of a neural network, a change in its architecture and the presence of a large database will further allow investigating other factors that affect the fatigue strength of metals at low temperatures, but which are difficult to study in climatic chambers.
Kozhevnikov, Thermophysical properties of materials at low temperatures, Directory, Mechanical Engineering, 1975
Physicomechanical properties of metals, Nauka. 1974 179-183.

Therefore, the weldability, the welding procedure and parameters as well as the overall properties of T24 weld joints must be carefully studied and analysed.
The chemical composition and the mechanical properties of the used material are presented in Tables 1 and 2, respectively.
Kubon, Aplication properties of T24 welded joints for boiler waterwalls, in: PROMATTEN 2011. 1. issue.
Pecha, Experience with utility properties of the T24 steel, in: Zvaranie Svarovani-61. 1. issue.
Mohyla, Influence of the heat treatment temperature on the mechanical properties of low alloy creep resistant steel welded joints, in: 20th International Conference on Heat Treatment.

Low durability and compressive strength are the main factors that led to the development of different strategies of enhancement taking even under consideration the surroundings.
Nanoparticles can alter the properties of materials and improve the pore structure, which in turn affects their durability.
As advanced materials, nanoclays enhance the physical and mechanical properties, can reduce permeability and offer protection against environmental factors, such as chemicals, moisture and gases [34-36].
Apart from the physical properties tested, the mechanical properties of the samples were examined as well.
Mechanical properties of the materials.

The analysis of factors affecting the state of the metal of pipelines of heating networks on the territory of hazardous production facilities is carried out, of which the effect of mechanical loads should be especially distinguished.
All these factors lead to deterioration of the mechanical properties of the metal as a result of aging; in addition, various stress concentrators can be present in the metal.
Despite the large number of operating conditions used in the design and strength calculations of main pipelines, all the factors of pipeline operation are often difficult to take into account, since in most cases the calculation results change significantly due to the simplification of the design schemes, inaccuracy of the initial information, changes in operating conditions, etc.
(Moscow: Mechanical Engineering) p 511
[22] Kultaev MA 2018 Innovations in information technologies, mechanical engineering and vehicles.

The performance of PU is affected by several factors [8–11], including macromolecular structure of chains, the degree of branching, and the amount of crosslinks.
Mechanical properties and wear-resistance performance of prepared materials are discussed.
Results and discussion Mechanical Properties and Friction Performance.
Content of functional fiber was another important factor influencing the properties.
Mechanical and wear-resistance properties were observed relatively stable.