Synthesis and processing of powder materials in DC arc thermal plasma

Самохин, А. В.; Алексеев, Н. В.; Astashov, A. G.; Kirpichev, D. E.; Fadeev, A. A.; Sinaiskiy, M. A.; Tsvetkov, Yu. V.

doi:10.1088/1742-6596/1393/1/012126

Cited by 5 publications

(3 citation statements)

References 6 publications

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“…Plasma atomization is a relatively new process, developed to produce high-purity powders from reactive metals and high-melting-point alloys such as titanium, zirconium, and tantalum [5,6]. Plasma atomization allows us to produce fine particles with a highly spherical shape and a low oxygen content.…”

Section: Introductionmentioning

confidence: 99%

Thermal Plasma Spheroidization and Characterization of Stainless Steel Powders Using Direct Current Plasma Technology

Iovane,

Borriello,

Pandolfi

et al. 2024

Plasma

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The production of spherical powders has recently registered a boost due to the need to fabricate new printing materials for Additive Manufacturing applications, from polymers and resins to metals and ceramics. Among these materials, stainless steels powders play a leading role, since they are widely used in industry and everyday life; indeed, micron-sized spherical stainless steel powders have specific characteristics and are considered as one of the best candidates for Additive Manufacturing systems and for application in a wide range of sectors. In this paper, stainless steel 316 L powders were used to explore and identify the best process parameters of a thermal plasma process able to produce spherical powders for Additive Manufacturing applications. X-ray Diffraction, Scanning Electron Microscopy, Particle Size Distribution and Flowability analysis were performed to characterize reagents and products. Powders with a high circularity (>0.8) and improved flowability (<30 s/50 g) were successfully obtained. The collected results were compared with data available from the literature to identify the potential use of the spherical produced powders.

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Section: Introductionmentioning

confidence: 99%

Thermal Plasma Spheroidization and Characterization of Stainless Steel Powders Using Direct Current Plasma Technology

Iovane,

Borriello,

Pandolfi

et al. 2024

Plasma

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“…The atmosphere used for the above said processes are mainly: Ar, N 2 ,H 2 , He, CH 4 ,NH 3 [10] or mixture of two gases [18,19]. Rotary Kiln [12], TG [4,20], EAF [2,10], Plasma [21,22], Microwave [23], Blast Furnace [24][25][26], Mechanical Alloying [27,28], Fluidized Bed Reactor [29,30], etc., were used as a reactor for reduction purpose. However, in the present study clay crucibles were used as a reaction chamber for reduction and electrically heated muffle furnaces are used as a source of heat.…”

Section: Introductionmentioning

confidence: 99%

An Innovative Process for Production of TiO2 from Low Grade Raw Materials

Paswan¹,

Madhurai²

2023

Iron Ores and Iron Oxides - New Perspectives

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Conventionally titanium oxide is produced from Ilmenite ore by carbothermic reduction of iron in the ore. The metal is subsequently leached out to produce high purity titanium oxide which leads to a loss of metallic iron. In addition, the process requires elaborate steps for disposal of effluents which are produced in proportion equal to that of the oxide. This adds to the cost of the process considerably. Other process routes for the production of titanium oxide from the ore suffer from similar drawbacks. Therefore, the objective is to develop an innovative process for the production of titanium oxide using ilmenite ore and lean grade coal via reduction technique and separation of iron from titanium oxide through melting route.

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“…Форма и размер частиц сильно зависят от метода, используемого для их получения [1,2]. К основным методам получения порошков можно отнести механосинтез [3,4], химическое осаждение [5], детонационный синтез [6,7], электролиз [8], плазмохимический метод [9] П и метод электровзрыва [10]. На образование связей между частицами во время прессования и дальнейшего спекания существенное влияние оказывают физические и химические свойства исходных порошков, что, в свою очередь, влияет на характеристики получаемых компактов [11,12].…”

Section: Introductionunclassified

Impulse pressing of diamond-containing metal materials

Kolosova,

Rusin,

Khlybov

2023

Vestnik IzhGTU imeni M.T. Kalashnikova

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He results of a study of the structure and wear resistance of compacts obtained from a finely dispersed mixture on a nickel bond of composition 70% Ni - 25% Cu - 5% Fe (average particle size about 50 μm) with the addition of micropowder diamond with a grain size of 5/3 with a 100% reference concentration were presented. Impulsed pressing of powder materials was carried out using a modified Kolsky method, which makes it possible to control the loading parameters and choose rational modes of powder material compaction with loading pulse durations in the range of 100-400 μs with pressure amplitudes up to 2000 MPa. Impulse pressing was carried out at a temperature of 20 °С. As a result, compacts with relative density of more than 98 % were obtained. Metallographic studies carried out on a NEOPHOT-32 microscope showed that the resulting compacts have a fairly uniform fine-grained structure. The overall pattern of pore distribution is quite uniform, the observed pore shapes are close to spherical and semiregular convex-concave volumes. X-ray microanalysis carried out on an energy-dispersive spectrometer in the mode of scanning along the surface line and transverse sections of the obtained compacts showed that dynamic pressing does not lead to a noticeable change in the distribution of the elements Ni, Cu, Fe, and C over the sample volume. The measurements of the microhardness of compacts showed that dynamic pressing leads to its growth, compared with the same parameter obtained on sheet samples after rolling and sintering. The compacts were tested for wear resistance in the dry friction mode according to the “rotating disk - stationary sample” scheme. The relationships of the mass loss of compacts and the test time are presented. It has been experimentally established that the wear resistance of compacts obtained by impulse pressing and subsequent sintering is higher compared to compacts obtained by traditional modes of pressing and subsequent sintering.

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Synthesis and processing of powder materials in DC arc thermal plasma

Cited by 5 publications

References 6 publications

Thermal Plasma Spheroidization and Characterization of Stainless Steel Powders Using Direct Current Plasma Technology

Thermal Plasma Spheroidization and Characterization of Stainless Steel Powders Using Direct Current Plasma Technology

An Innovative Process for Production of TiO2 from Low Grade Raw Materials

Impulse pressing of diamond-containing metal materials

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