Investigation of gas dynamic coatings based on electroerosive aluminum powders

Purpose of reseach. Study of the microstructure of experimental blanks of new tungsten-free hard alloys.

Methods. The experimental solid–alloy powder material (charge) was fused by the method of material synthesis by pulsed plasma fusion, which makes it possible to obtain high-quality compact products from metal powders and composites with minimal material and energy losses (SPS - Spark Plasma Sintering). The method is based on the effect of high voltage and impulsive electric current on metal particles inside the mold. This process is accompanied by the formation of a high-temperature plasma that occurs directly around each individual metal particle. Plasma causes a rapid local increase in temperature and pressure, which contributes to the intense diffusion interaction of particles and the formation of dense structured products. The microstructure of the alloy was studied using a QUANTA 600 FEG scanning electron microscope.

Results. The alloy has a complex microstructure consisting of various phases and inclusions. 1. Titanium Carbide (TiC) phase: large grains, which are titanium carbide (TiC), have a straight shape and are evenly distributed throughout the entire volume of the alloy; Titanium carbide is an important component of the alloy, as it provides high hardness and wear resistance. 2. Alloy matrix: an alloy matrix is located between the grains of titanium carbide, which consists of nickel (Ni) and molybdenum (Mo). This matrix ensures the ductility and strength of the alloy; The matrix has a granular morphology, which indicates the presence of small grains, which are the result of heat treatment during pulsed plasma fusion. 3. Defects and dislocations: There are minor defects and dislocations, especially near the interface. These defects can contribute to the formation of an additional reservoir of strength and resistance to fatigue damage.

Conclusion. A study of the microstructure of a new tungsten-free hard alloy has shown that the alloy has a complex two-phase structure consisting of titanium carbide and a matrix enriched in nickel and molybdenum. This structure provides the alloy with high hardness, wear resistance and durability. The presence of defects and dislocations can help improve the mechanical properties of the alloy. These results confirm the prospects of developing new tungsten-free hard alloys that can become an alternative to traditional materials containing expensive tungsten.

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