Definition of synthesis parameters of ultrafine nickel powder by direct electrolysis for application in superalloy production
Journal Title: Восточно-Европейский журнал передовых технологий - Year 2018, Vol 1, Issue 6
Abstract
<p>The optimization of the synthesis method of ultrafine nickel powder for the production of superalloys, by means of direct electrolysis of the nickel ammine complex, has been conducted. The influence of electrolyte temperature and ammonia concentration on the electrolysis process and powder characteristics has been studied. It has been revealed that an increase in electrolyte temperature leads to a larger particle size of the powder and formation of compact metal particles. It has been determined that the maximum electrolyte temperature must not exceed 50 °С. By recording the polarization curves, it was established that an increase in ammonia concentration leads to increased polarization of nickel formation and formation of finer powder. Lowering of ammonia concentration leads to contamination of the powder with barely soluble hydroxyl compounds of nickel. Analysis of the anodic curves has revealed that the nickel anode is partly soluble. It has been discovered that the addition of Trilon B to the electrolyte has a positive effect on powder characteristics. The powder formed under optimal conditions was composed of coral-like particles with the size of 40–70 µm, which could be easily ground to their spherical components if no compact metal particles were present. High purity of the powder was confirmed by the EDX. The cathodic and anodic current yields were determined to be: 35–41 % and 5–8 % respectively.</p>
Authors and Affiliations
Vadym Kovalenko, Valerii Kotok, Sergey Vlasov
Keywords
Related Articles
- EP ID EP527770
- DOI 10.15587/1729-4061.2018.121595
- Views 83
- Downloads 0
Research into the process of multi-level management of enterprise production activities with taking risks into consideration
<p>The study considers the process of management of the production activity of an enterprise during a certain interval of time. It takes into account components of the production process and an influence of various produ...
Development of geomodel for concentration determination of hazardous chemicals in the atmosphere
A critical analysis of the approaches to the development of a model for determining the concentration of hazardous chemicals (HC) in the atmosphere, which are the basis of computeraided environmental monitoring systems...
Definition of synthesis parameters of ultrafine nickel powder by direct electrolysis for application in superalloy production
<p>The optimization of the synthesis method of ultrafine nickel powder for the production of superalloys, by means of direct electrolysis of the nickel ammine complex, has been conducted. The influence of electrolyte tem...
Intensification of the process of metallizing tungstencontaining ore raw materials by the powder metallurgy method
<p>X-ray diffraction phase analysis of samples performed on a DRON-6 diffractometer has shown that the processes of CaWO<sub>4</sub> transition to WC and W<sub>2</sub>C had the highest probability in the temperature rang...
Analysis of interaction between a configurable stone and a water flow
<p class="a">Erosion and destruction of riverbeds, foundations of flooded engineering structures are accelerated during natural phenomena, accompanied by a significant increase in the rate and wetted perimeter of river f...