Abstract
This article is devoted to the characterization of a new Co-W-Al alloy prepared by an aluminothermic reaction. This alloy is used for the subsequent preparation of a special composite nanopowder and for the surface coating of aluminum, magnesium, or iron alloys. Due to the very high temperature (2000 °C–3000 °C) required for the reaction, thermite was added to the mixture. Pulverized coal was also added in order to obtain the appropriate metal carbides (Co, W, Ti), which increase hardness, resistance to abrasion, and the corrosion of the coating and have good high temperature properties. The phase composition of the alloy prepared by the aluminothermic reaction showed mainly cobalt, tungsten, and aluminum, as well as small amounts of iron, titanium, and calcium. No carbon was identified using this method. The microstructure of this alloy is characterized by a cobalt matrix with smaller regular and irregular carbide particles doped by aluminum.
Highlights
X-ray fluorescence cannot determine the carbon content; instead, energy dispersive spectroscopy (EDS) analysis was performed on a scanning electron microscope to determine its amount
From the results of the X-ray fluorescence method and EDS analysis on a scanning electron microscope, it can be stated that the alloy Co70W12Al15 consists of the basic elements of the alloy, namely: cobalt, aluminum, and tungsten
A new alloy Co70W12Al15 was successfully prepared by aluminothermic reaction
Summary
The preparation of particular multicomponent alloys containing metals with melting points of 660 ◦ C (aluminum) as well as high-melting point-metals such as cobalt (1495 ◦ C), titanium (1668 ◦ C), molybdenum (2623 ◦ C), and tungsten (3422 ◦ C) is very difficult [1,2,3,4]. Another problem with the preparation of these alloys containing aluminum-refractory metals is the extensive dispersion of density and the fact that these alloys do not form solid solutions with one another in most cases.
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