Improving the Efficiency of Air Plasma Spraying of Titanium Nitride Powder

Kengesbekov, Aidar; Rakhadilov, Bauyrzhan; Sagdoldina, Zhuldyz; Буйткенов, Д.Б.; Dosymov, Yelmurat; Kylyshkanov, Manarbek

doi:10.3390/coatings12111644

Cited by 7 publications

(2 citation statements)

References 31 publications

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“…The values of the coefficient of dry friction at the beginning of the test increase from 0.05 to an average of 0.45, which roughly corresponds to rubbing materials "steel-steel" during sliding. According to the results of a comparative analysis of the tribological properties (Figure 9 ), the EPH of steel 14X17H2 (431 AISI, SAE, ASTM) causes a significant 2.36 times to decrease in wear intensity without lubrication, under conditions of adhesive wear in the absence of noticeable frictional heating, as well as during sliding friction on a steel plate in the presence of lubricant, under conditions of boundary friction [28][29].…”

Section: Fig 5 Cyclic Electrolytic-plasma Hardeningmentioning

confidence: 99%

Improving wear resistance by electrolyte-plasma hardening of corrosion-resistant steel of the tip

et al. 2023

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The development of new fields in the oil and gas industry of Kazakhstan, the exploitation of fields with hard-to-recover reserves, and the exclusion of harmful environmental impacts require the study of new advanced technologies in the manufacture of valves. Hardening of the throttle tip in the factory from low-carbon corrosion steel is provided traditionally: carburizing in a solid carburetor, followed by hardening and normalization in an electric furnace. However, this process is accompanied by high heat losses, long time spent on heating and cooling the furnace to the required temperature, and high-energy consumption - power costs are 60-100 kW/h. The carbon penetration rate is low, and for depths of 1-1.5 mm, it becomes necessary to heat the workpiece in a carburetor for 8-10 hours at a certain temperature, followed by hardening and normalization. The technological process of traditional hardening by cementation, followed by hardening and normalization, is accompanied by the appearance of various defects. The most common defects include the formation of microcracks, warpage, scale, and peeling of the metal, as well as high labor intensity and energy intensity. A technology has been developed for hardening the tip on an electrolytic-plasma modification installation, which includes heating the part to 910-9600C and quenching in an electrolyte flow at 330-3600C, characterized in that the part is heated by electrolyte plasma, the temperature of which exceeds 6000 K. Analytically and experimentally it was determined that heating with electrolyte plasma for quenching is achieved within 4 seconds and quenching in the electrolyte flow is achieved within 8 seconds. With cyclic electrolytic plasma hardening at the 10th cycle with 40 seconds of total processing, optimal hardening rates are achieved. An electron microscopic study of the hardened structure indicates a phase transformation and the formation of hardening martensite with a carbide network, which strengthens the steel. The tribological properties and friction coefficient of the surface layers formed during electrolytic-plasma hardening indicate an increase in the wear intensity by more than two times.

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Section: Fig 5 Cyclic Electrolytic-plasma Hardeningmentioning

confidence: 99%

Improving wear resistance by electrolyte-plasma hardening of corrosion-resistant steel of the tip

et al. 2023

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“…Small and large fractions are proposed to be screened out, which is not economically viable. The temperature regimes for processing polymers have narrow temperature ranges compared to metals and ceramics [14,15]. Polymers are prone to degradation-this imposes special requirements on the exact choice of temperature regimes.…”

Section: Introductionmentioning

confidence: 99%

Development and Studying of the Technology for Thermal Spraying of Coatings Made from Ultra-High-Molecular-Weight Polyethylene

et al. 2023

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UHMWPE is resistant to acids, alkalis and radiation. Its combination of unique properties makes this material attractive for obtaining multifunctional coatings. However, in practice, obtaining coatings based on UHMWPE is associated with difficulties associated with low thermal conductivity and high viscosity of the material. The possibility of overcoming the technological problems of obtaining gas-thermal coatings based on UHMWPE was studied in the present work. A physical model of a flame with UHMWPE particles moving along the central axis was developed by the finite element method. The temperature along the central axis of the plume was determined. The interaction between a gas-thermal torch and a UHMWPE particle was established. It was determined that the residence time of UHMWPE particles in a gas-thermal flame is not enough for its complete penetration, which is the reason for the appearance of various defects. The interrelation of the particle heating rate in the torch depending on its diameter was determined. A new variant of coating deposition with preliminary heating of the powder in a fluidized bed was proposed. The thermal characteristics of UHMWPE powder were determined by differential scanning calorimetry and thermogravimetric analysis. The allowable temperature interval for UHMWPE deposition was established. Coatings were obtained under various deposition modes. It was established using the methods of X-ray diffraction analysis and infrared spectroscopy that the structure of the crystal lattice of UHMWPE did not change after deposition. Significant oxidation processes do not occur during spraying. It was found using scanning electron microscopy that the coatings obtained with preliminary heating of the powder in a fluidized bed do not have air inclusions. The obtained results make it possible to obtain higher quality coatings.

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Effect of Helium Plasma Irradiation on Microstructures and Mechanical Properties of Tungsten

Kengesbekov,

Rakhadilov,

Satbaeva

et al. 2024

Advances in Materials Science and Engineering

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The paper presents the results of the study of tungsten surface structure modification under helium plasma irradiation. It is revealed that during irradiation of samples, surface modification in the form of relief development as a result of irradiation is observed. X‐ray phase analysis showed that no new phases of the W system were found after irradiation, only an increase in the intensity of diffraction lines was observed. There are significant differences in the microstructure of tungsten depending on the temperature of helium plasma irradiation in the above range. It is assumed that the cause of defects is the extremely low solubility of helium in tungsten. Metallographic analysis has shown that at irradiation of tungsten samples in time modes 1 and 1.5 hours, the degree of relief development is not high in comparison with the tungsten sample irradiated in the 0.5‐hour mode. The greatest increase in surface roughness of the sample irradiated for 1 hour was registered, which is associated with the formation of small cracks, bubbles, and pores in the surface layer. At the same time, in the samples irradiated for 1.5 hours, the surface of which is characterized by chaotically located protrusions and depressions of various shapes, the roughness parameter Ra was 0.0603 μm. It was found that at temperature regimes T = 1200°C and T = 1500°C, the microhardness of tungsten increases by 10% and 11%, respectively.

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Improving the Efficiency of Air Plasma Spraying of Titanium Nitride Powder

Cited by 7 publications

References 31 publications

Improving wear resistance by electrolyte-plasma hardening of corrosion-resistant steel of the tip

Improving wear resistance by electrolyte-plasma hardening of corrosion-resistant steel of the tip

Development and Studying of the Technology for Thermal Spraying of Coatings Made from Ultra-High-Molecular-Weight Polyethylene

Effect of Helium Plasma Irradiation on Microstructures and Mechanical Properties of Tungsten

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