Development of electricarc pseudoalloy coatings for the strengthening of copper walls of molds
Journal Title: Восточно-Европейский журнал передовых технологий - Year 2018, Vol 3, Issue 12
Abstract
<p>On the basis of the requirements for protective coatings of molds, the materials of pseudoalloys were determined for applying coatings from two wires. One of the wires is copper, which provides maintaining a sufficient thermal conductivity of the layer, and the second one consists of a material, which provides wear resistance of a coating. As the second wire, the wires NiCr, Mo, Ti and a flux-cored wire were used, consisting of a steel sheath and a filler – FeB powder. Based on the calculation data on the thermal conductivity of coatings, taking into account the coefficients of heat transfer, the estimation of the influence of these coatings on the thermal processes in the mold (temperature of the wall surface, intensity of heat removal from the wall) was performed. Applying electric-arc spraying, the pseudoalloy coatings with a uniform distribution of components were produced, one of which is copper with a hardness of 1,320–1,460 MPa, and the second one is the strengthening component NiCr, with a hardness of 2,440 MPa; Mo, with a hardness of 5,350 MPa; Ti, with a hardness of 7,540 MPa; FeB, with a hardness of 7,050 MPa.</p><p>As a result of measurements of the coefficient of thermal expansion of coatings, it was found that the coating Cu-NiCr is the closest to the coefficient of thermal expansion of copper. Then it is followed by Cu-FCW (FeB), Cu-Ti and Cu-Mo. The abrasive wear resistance of pseudoalloy coatings at a room temperature exceeds pure copper 1.4–2.3 times. The tests of pseudoalloy coatings for resistance to wear during heating to 350 °C showed that the wear resistance of Cu-NiCr and Cu-FCW (FeB) coatings exceeds the resistance of pure copper 4.5 and 22 times, respectively. The hot hardness of the coating Cu-NiCr in the range of 20–400 °C exceeds the hardness of pure copper 3 times.</p>
Authors and Affiliations
Yuri Borisov, Nataliia Vigilianska, Ivan Demianov, Oleksandr Grishchenko
Keywords
Related Articles
- EP ID EP528037
- DOI 10.15587/1729-4061.2018.134337
- Views 65
- Downloads 0
Investigation of multiple contact interaction of elements of shearing dies
<p>When justifying the design parameters, it is necessary to carry out the analysis of the strain-strain state of individual elements of technological systems, which are sets of parts under contact interaction conditions...
Current distribution of 137cs in sod-podzolic soils of different types of forest conditions
We have examined the current distribution of <sup>137</sup>Cs in the turf-podzolic forest soils for different types of forest conditions. The analysis of the redistribution of <sup>137</sup>Cs in soil in 30 years after t...
Construction of a generalized model of the harmful substances biochemical destruction process kinetics under conditions of substrate inhibition using the methods of simulation modeling
<p>For the purpose of obtaining the complete range of solutions for substrate inhibition of varying intensity, the mechanism of enzyme kinetics in a biocell was modeled by a multi-channel queuing system. A full range of...
The effect of template residual content on supercapacitive characteristics of Ni(OH)2, obtained by template homogeneous precipitation
Nickel hydroxide is widely used in hybrid supercapacitors. High electrochemical activity is demonstrated by α-Ni(OH)<sub>2</sub> prepared by template<strong> </strong>homogeneous precipitation. A possible disadvantage of...
Devising a procedure for the synthesis of electromechanical systems with cascade-enabled fractional-order controllers and their study
An approach to the synthesis of automatic control circuits has been proposed, based on a fractional characteristic polynomial, which makes it possible to ensure the desired quality of a transition process under condition...