Technology of Obtaining Long-Length Powder Permeable Materials with Uniform Density Distributions

Zabolotnyi, Oleg; Povstyanoy, Oleksandr; Somov, Dmytro; Sychuk, Viktor; Svirzhevskyi, Kostiantyn

doi:10.1007/978-3-030-20904-9_5

Cited by 3 publications

(3 citation statements)

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“…У роботі [8] викладено графіки ізостатичного пресування, що є досить близькими до наших вихідних даних, а тому по зміні їх пористості можна порівнювати даний процес для спікання корпускулярних тіл з сферичних та губчастих часток.…”

Section: вступunclassified

“…Число зерен на одиницю площі за Тамманом зменшується з часом відпалу по рівнобокій гіперболі (8), або по нерівнобокій (9 вище 800 °С -взаємодія з парами води [13]. А 855,2 °С -температура монотропного перетворення брукіту та анатазу в оксидній плівці титану в брукіт; 883 °С -температура початку процесу перетворення низькотемпературного α-титану з високотемпературним гранецентричним щільним пакуван-ням в решітці в β-титан з гранецентричним кубічним пакуванням.…”

Section: результати та обговоренняunclassified

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Модель Формування Пористості Брикетів Губчастого Титану На Стадії Спікання

Klymenko¹,

Andrieiev²,

Sluchak³

et al. 2023

aktt

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This article examines the peculiarities of the formation of interparticle connections in porous products based on titanium powders using sponge titanium as an example, which are used in the aviation industry and airfield management. The developed model is based on the results of a previous study, where the structure of cuboctahedral and inverse cuboctahedral clusters of packing spherical powder particles was determined at the most dense packing. During the study, a model of the fusion of particles at the points of pressing deformation due to recrystallization under the influence of high temperatures in a vacuum was developed. 4 main stages of powder briquette sintering were considered, and a mathematical model was developed for each of them. Thus, the stage of liquid evaporation is considered from the viewpoint of the cavitation effect of boiling on the surface of particles and boiling of plasticizers. Euler's film boiling formula was used to describe the forces acting on the particle surface; Tolubinsky's formula was used for bubble boiling; convective heat exchange was considered part of the final stage of sintering. The stage of the formation of metallic bonds is modeled on the basis of the results of practical studies in the REV 5.5 furnace, recrystallization based on differential scanning colorimetry on the NETZSCH STA 449F1 Proteus device, and determining the change in grain size according to the E19 ASTM scales using the Jeffers method. The diffusion stage is modeled on the basis of the approximation of the particle deformation model in the contact zones at the pressing stage using the Frenkel formula. Linear shrinkage is modeled based on direct measurement of sample sizes before and after sintering. The developed model has a certain versatility when applied to simulate the interaction of particles of metal powders under the conditions of the formation of porous briquettes, especially if the shape of the particles is close to round or spongy. The obtained result will make it possible to more accurately evaluate such a factor as the adhesion between the particles of the pressing and predict the tensile strength of the material. Additionally, due to the mathematical characterization of the peculiarities of the formation of corpuscular porosity under the conditions of sintering in a vacuum, we can design materials with differentiated porosity, as well as lay the foundations for powder 3D printing of such materials, by assembling grain by grain, or layer by layer with the adjustment of the force of particle compression one into the other.

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Section: вступunclassified

Section: результати та обговоренняunclassified

Модель Формування Пористості Брикетів Губчастого Титану На Стадії Спікання

Klymenko¹,

Andrieiev²,

Sluchak³

et al. 2023

aktt

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“…Zabolotnyi et al [21,22] proposed a technology to obtain long-length, permeable powder materials with uniform density distribution and stable operational characteristics. Somov et al [23] developed an experimental stand to process powder materials using a vibratory actuator.…”

Section: Introductionmentioning

confidence: 99%

An Increase in the Energy Efficiency of Abrasive Jet Equipment Based on the Rational Choice of Nozzle Geometry

Baha,

Mižáková,

Pavlenko

2023

Energies

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Permanently increasing requirements for the accuracy of abrasive jet machining (AJM) predetermine a need to increase requirements for the rational choice of the related energy-efficient technological equipment. Due to the relatively cheap and high-quality cleaning of materials from contaminants using AJM, the problem of increasing the energy efficiency of the corresponding equipment based on the rational choice of nozzle geometry becomes more topical. This is also because the working nozzle is a consumable part that requires periodic replacements. Therefore, this article deals with rational designing working nozzles as a reliable way to decrease the power consumption of the compressor equipment while engaging in AJM. For this purpose, experimental and numerical studies of the operating processes in the nozzle were carried out. The main idea of increasing the nozzle’s efficiency was to reduce the contact area between the working flow and the nozzle. Due to this, the friction of the abrasive material with its walls was decreased. As a result, the AJM was accelerated, and the energy consumption of the corresponding compressor equipment was reduced. The research showed that a decrease in the nozzle’s length up to 4 mm increased the flow ratio by 84% and decreased the energy consumption of the 40 kW compressor unit by 4.5 times.

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Effect of Erosion on Surface Roughness and Hydromechanical Characteristics of Abrasive-Jet Machining

Baha,

Pitel,

Pavlenko

2024

JES

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The article contains the fundamental results of the experimental and numerical investigations for pneumo-abrasive unit nozzles with different geometries. The research was purposed by the pressing need to develop an inexpensive and effective working nozzle design of the air-abrasive unit which can be applied for surface processing before some technological processes are performed, as well as for surface coating, descaling after thermal treatment, processing of hollow holes of the crankshafts, smoothing of the inner surfaces of the narrow channels between the impeller blades after electric discharge machining for ultrahigh-pressure combination compressors. Several designs were considered, ranging from the simplest to those with a complicated inner channel geometry. The impact of the nozzle material and challenging inner surface application on its characteristics has also been studied. The research was done using the application of modern CFD complexes for numerical modeling of the air-abrasive mixture discharge from the working nozzle of the pneumo-abrasive unit. In addition, physical experimentation was provided. The methods applied in the research allow for profound, systematic research of spraying units operating on the air-abrasive mixture within a wide range of geometrical and mode parameters. The novelty of the gained results lies in the development of the mathematical model of the pneumo-abrasive nozzle operating process, the working out of a cheaper nozzle design, getting information about air-abrasive mixture distribution along the nozzle length, giving practical recommendations for calculation and designing a working nozzle for the jet-abrasive unit.

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Technology of Obtaining Long-Length Powder Permeable Materials with Uniform Density Distributions

Cited by 3 publications

References 3 publications

Модель Формування Пористості Брикетів Губчастого Титану На Стадії Спікання

Модель Формування Пористості Брикетів Губчастого Титану На Стадії Спікання

An Increase in the Energy Efficiency of Abrasive Jet Equipment Based on the Rational Choice of Nozzle Geometry

Effect of Erosion on Surface Roughness and Hydromechanical Characteristics of Abrasive-Jet Machining

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