the article deals with the problem of the development of materials science. The author pays special attention to the issue of the development of new materials, which is associated with the increasing requirements to boost the level of their physical, chemical, technological and operational properties and the creation of technologies for obtaining and production. The idea is substantiated that the development and production of instrumental materials is of particular scientific and practical interest. It is known that in mechanical engineering and other industries, labor productivity and the qua...
the technological principles of increasing the physical and mechanical characteristics of oxide and nitride ceramics plates by surface treatment, combining various options of abrasive action and coating are revealed in this article. The author carried out the analysis of wear-resistant coating compositions for various operating conditions of ceramics and provided information about their effect on strength characteristics and the distribution of residual stresses in the surface layer.
the issues of increasing of the energy efficiency of technological processes of vacuum plasma spraying coating by optimizing the parameters of the supply voltage of the asynchronous electric drive of the forevacuum pump are considered in this article. The author puts forward methodology of a technique for an automatic control system for the parameters of the supply voltage of an asynchronous pump motor.
The SLM-process has been optimized for manufacturing of parts from Co-base alloy powder on the machine ПТК-ПС. The XRD analysis is researched and physic-mechanical properties of the samples made on optimum parameters of selective laser melting are defined.
the theoretical and experimental results of the investigation of fixed abrasive polishing of ceramic are presented in the paper. The equations of the intensity of dispersion allowing to assess the performance and the accuracy of shaping by using related technological environment and the geometry of the lapping are given in the article.
this paper discusses the rule that polymorphic transformation does not occur in heat-resistant steels and alloys. The basic theoretical principles used to analyze the most diverse processes occurring in heat resistant steels and alloys have been analyzed and described. The crystallization process of various alloys, the formation and decomposition of austenite, and the new phase formed during various operations of chemical-heat treatment are described. Extensive experimental data has been widely used to address the issues discussed, which allows us to evaluate and verify the reliability of theo...
in article there are discussed the basic results of theoretical investigating continuous ultra-dispersed powder materials pressing process for obtaining lengthy products with nano-crystal structure. Within the framework of the hypothesis about similarity under stress conditions in compressible and incompressible materials in the pressing channel, the pressure distribution along the pressing channel is established. Using G.M. Zhdanovich equation with new material density distribution boundary conditions along the length of the pressing channel is found.
it is more appropriate to describe mathematic model for gas-thermal surfaces by means of finite triangular elements, for thin surfaces one should use shell finite elements. In mathematic model for plasma surfaces is more appropriate to present the thickness of layer by means of plate set or shell set and bar elements.
in the article the current ways and the equipment for batching of powder шmaterials are considered. On the basis of an estimation of volume feeders accuracy authors revealed a necessity of use instead of them weight feeders: vibratory feeders or feeders of a suspension of powders in gas. There is perspective to use of feeders of suspensions of powders in gases for batching of ultra tiny portions of powders.
сoating deposition on dielectrics is used a source of metal atoms and fast gas molecules produced due to charge exchange collisions of accelerated ions in a processing chamber is described. The metal atoms are produced due to ion sputtering of a target placed at the bottom of the hollow cathode inside the source. When a mixture of argon and nitrogen is used, nitride coatings are produced with deposition rate up to 4 µm/h, the coatings being interruptedly bombarded by molecules with energy rеgulated from 10 to 300 eV.
given clause describes the done job routed on a raise of accuracy of got canals, in details from fragile rigid nonmetallic stuffs, during drilling by their diamond drill.
The development of a simulation model of heating mould sets connector parts edges by laser thermal treatment hardening for producing molding glass is described in the article. The mathematical model experimental verification was carried out.
In this article the results of theoretical investigation of fibers impregnation in manufacturing high filled composite by pultrusion are represented. A criterion is maximum intention of technological process. An analytical investigation of intention depending on main physical factors is proposed.
In this article the results of theoretical investigation of the process feeding fibers during the formation of high filled composites in pultrusion way are given. The main physical factors which influence on a section change of fiber are considered. It is developed a mathematical model describing a single fiber and their total as an isotropic material. An analytical dependence a concentration of fibers in prepared manufacture from a volume stuff in die entrance is obtained.
The paper presents results investigated a lubricating properties of SN 150 mineral base oil modified with exploitation preparations R-2000 (soft material based preparation), MOTOR LIFE (chemical preparation) and Acorox 880 (zinc preparation). The test was conducted using the T-02 tester (four ball apparatus).
