phase composition
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2022 ◽  
Vol 48 ◽  
pp. 103963
Author(s):  
Hamdy A. Abdel-Gawwad ◽  
Khalil A. Khalil ◽  
Ayman A. Gouda ◽  
Abdelrahman H. Elkhoresy ◽  
Mohammed A. Arif

2022 ◽  
Vol 28 ◽  
pp. 101651
Author(s):  
Guipeng Li ◽  
Guihong Song ◽  
Nan Wang ◽  
Fang Hu ◽  
Yusheng Wu ◽  
...  

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 658
Author(s):  
Štefan Michna ◽  
Anna Knaislová ◽  
Iryna Hren ◽  
Jan Novotný ◽  
Lenka Michnová ◽  
...  

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.


2022 ◽  
Vol 1 (1) ◽  
pp. 41-48
Author(s):  
Anvar Kadirmetov ◽  
Dmitrii Popov ◽  
Stepan Agarkov

The microstructure and phase composition of the coating obtained by plasma spraying of FeCoCrAlTiCuMo powder in an equiatomic ratio of components have been investigated. The results showed the possibility of creating a multicomponent single-phase solid solution by plasma spraying and the expediency of studying it.


2022 ◽  
pp. 37-43
Author(s):  
G. K. Zhanbolatova ◽  
A. Z. Miniyazov ◽  
T. R. Tulenbergenov ◽  
I. A. Sokolov ◽  
O. S. Bukina

This paper presents the results of a study of the formation of a carbidized layer under various experimental conditions and the choice of optimal parameters for carbidization of a tungsten surface under plasma irradiation. To study the effect of the surface temperature of a tungsten sample and the duration of plasma irradiation, experiments were carried out at a sample surface temperature of 1300 °C and 1700 °C with an irradiation duration of 300–2400 s. Analysis of the research results showed that the maximum formation of W2C on the surface is observed at a test temperature of 1700 °C. At a temperature of 1300 °C, the phase composition of the carbidized layer depends on the duration of plasma irradiation. According to the literature analysis, the formation of WC occurs on the surface of tungsten, from which C diffuses into the particle and forms the underlying layer of W2C. With an increase in the ion fluence, depending on the irradiation time and the temperature of the sample surface, the diffusion of C into W accelerates, the WC content decreases, and W2C becomes the dominant carbide compound.


Coatings ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 70
Author(s):  
Evgeniy Rumyantsev ◽  
Varvara Rumyantseva ◽  
Viktoriya Konovalova

The article presents a method for obtaining white phosphate coatings on steel by cold method. The deposition of protective phosphate coatings was carried out from solutions based on the preparation “Majef”, consisting of manganese and iron phosphates. To obtain phosphate films of white color, it is proposed to introduce zinc and calcium nitrates into phosphating solutions at the rate of 25–30 g/L. The surface of phosphate coatings was studied using the SolverP47-PRO atomic force microscope images, and the average grain size was determined. The structural and phase composition of phosphate coatings was been studied using X-ray diffraction analysis. The protective properties of phosphate coatings were estimated by corrosion rate indicators calculated from corrosion diagrams. Fine-crystalline uniform coatings were obtained from modified phosphating solutions at room temperature on steel. The white color of phosphate coatings is due to the increased content of phosphophyllite, hopeite, and parascholzite in their structural and phase composition. By applying protective phosphate coatings of white color on a steel product, corrosion can be slowed down by 4–4.5 times. However, white phosphate coatings are inferior in protective properties to unpainted coatings. The index of change in the mass of samples with white phosphate coatings because of corrosion is 0.371–0.41 g/(m2·h), and with unpainted coatings is 0.128 g/(m2·h).


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