Study on effect of dielectric gas type on electrical discharge erosion synthesis of tungsten carbide nanopowder

Kabirinia, Farid; Shabgard, Mohammad Reza; Tabrizi, Nooshin Salman

doi:10.1007/s00339-019-2888-y

Cited by 7 publications

(8 citation statements)

References 28 publications

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“…Из-за высокой твердости, прочности и химической стойкости твердые сплавы приходится перерабатывать затратными химическими методами с применением опасных и вредных реактивов, загрязняющих окружающую среду [6][7][8][9]. Одним из перспективных альтернативных методов получения порошков напрямую из кусков материала без использования опасных реактивов является электроэрозионное диспергирование (ЭЭД) [10][11][12][13][14][15][16].…”

Section: введение введениеunclassified

Comparative analysis of the tool life of submicron hard alloy WC-10Co sintered from powder obtained by electro discharge in oil

Vlasova

2023

Izv. VUZ. Poroshk. Met.

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In this paper, comparative studies of the microstructure, mechanical characteristics and service life of a cutting insert made of submicron cemented carbide WC-10Co, obtained as a result of recycling VK10 cemented carbide by Electro Discharge Erosion (EDE) in oil, were carried out. The specific energy consumption directly for the formation of pulses in the process of EDE is to a relatively small value (5.7 kW·h/kg). Excess carbon formed as a result of oil pyrolysis during EDE was removed by heat treatment. The granulometric composition of the obtained powder and the microstructure of the particles were studied. It is shown that the particles of the resulting powder consist of plate-like WC grains with an average diameter of 0.46 pm and interlayers of cobalt. The WC-10Co cutting insert, obtained by sintering this powder in vacuum, was used for a comparative analysis of service life during fine turning of aluminum alloy D16T. As objects for comparative analysis, cutters equipped with blades made of industrial alloys VK8 and VK6OM of a similar design were used. The microstructure and mechanical characteristics of the experimental alloy and the analogues presented have been studied. On the basis of studies of the microstructure and chemical composition of the back surface of the cutting inserts, the wear mechanism of the cutters was analyzed. It is shown that the hardness of the alloys has the main effect on their wear resistance when cutting an aluminum alloy with the presented cutters. The influence of the hardness of the cutters on the surface roughness of the resulting part was also studied. The obtained submicron cemented carbide WC-10Co exhibits the highest hardness (1590 HV) and wear resistance of the presented samples due to the smallest WC grain diameter (0.59 pm).

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Section: введение введениеunclassified

Comparative analysis of the tool life of submicron hard alloy WC-10Co sintered from powder obtained by electro discharge in oil

Vlasova

2023

Izv. VUZ. Poroshk. Met.

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“…6б) от кристаллизации паровой фазы и пиролиза жидкости. Диаметры наночастиц, зависящие от температуры разрядного канала [20,30,41], мало влияют на средний диаметр частиц, так как находятся в виде агломератов, близких по размеру к сферическим частицам. Средний диаметр сферических частиц зависит от объема струи расплава, выбрасываемой из кратера, а также от свойств материала.…”

Section: морфология и гранулометрический состав порошковunclassified

“…Из-за высокой твердости, прочности и химической стойкости твердые сплавы приходится перерабатывать дорогостоящими химическими способами с использованием опасных и вредных реагентов [17][18][19]. Электроэрозионное диспергирование (ЭЭД) является одним из перспективных альтернативных методов получения порошков без использования этих опасных и дорогостоящих реагентов [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35].…”

Section: Introductionunclassified

“…После завершения искрового разряда пузырек пара схлопывается, а расплавленный и кипящий материал выбрасывается в межэлектродный промежуток и охлаждается со скоростью 10 6 -10 9 °С/с [39]. В результате закалки образуются наноразмерные [20,21,25,26,35,40,41], ультрамелкозернистые [27, 31,32,42,43] и аморфные частицы сферической формы. Эти сферические частицы, полученные методом ЭЭД, могут быть использованы в производстве ультрамелкозернистого твердого сплава, 3D-печати для изготовления индивидуальных изделий сложной формы [44][45][46] и нанесении покрытий методом высокоскоростного газопламенного напыления [47].…”

Section: Introductionunclassified

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Influence of Liquid Composition and Discharge Energy on Process Performance, Composition, and Properties of Particles Formed During Electric Discharge Erosion of WC-5TiC-10Co Alloy

Dvornik¹,

Burkov²,

Mihailenko³

et al. 2023

EOM

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Increasing the hardness and wear resistance of powder alloys and coatings through the use of ultrafine-grained powders and metastable phases is a promising way in powder metallurgy. This paper presents the results of the studies of the process of obtaining ultrafine powders by the electric discharge erosion of the cemented carbide waste WC-5TiC-10Co on a special installation. An empirical model that describes the dependence of the productivity of the process on the discharge energy and properties of the liquid is provided. The dependence of the chemical and phase compositions of the obtained powder on the composition of the used liquid and specific energy consumption has been investigated. The effect of the discharge energy on the morphological composition and average particle diameter has been examined. It is revealed that the formation of a metastable solid solution (W, Ti)C and a decrease in the concentration of cobalt induce an increase in the hardness of the resulting spherical particles from 1410HV0.05 to 2540HV0.05.

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“…Reducing the particle size of tungsten carbide and subsequent products can potentially improve the mechanical properties of the material, such as hardness, viscosity, and transverse tensile strength. Despite this, the production of nanoscale tungsten carbide powders on an industrial scale is constrained by the need to use expensive equipmen [16,17,18,19].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Effect of Tungsten Carbide (WC) Nanopowder on Iron-Based Powder Structural Materials

Gavrish

Chayka

Baranov

2021

SSP

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Studies of a powder used as a modifier obtained from solid-alloy waste, such as tungsten carbide (drill balls), are presented. Dispersion, particle morphology and phase analysis of the powder were studied. The powder obtained from solid-alloy waste is a phase – it is tungsten carbide WC, it consists of nanoobjects of various shapes (nanoparticles, nanoplastics) up to 100 nm in size, with a slight presence of agglomerates up to 250 nm in size. The influence of tungsten carbide nanopowder as a modifier on the mechanical properties (strength and hardness) of PK70D3 iron-based powder structural steel has been studied. For the study, two different modes of preparation of powder alloy have been used with the use of one-stage and two-stage sintering. The influence of additive nanopowder of tungsten carbide on the mechanical properties of structural alloy powder based on iron PK70D3 has been defined: strength increases by more than 23% (in single-stage sintering), by more than 28% (in double-sintering), hardness decreases by more than 6% in single-stage sintering and increases by more than 26% with two stages of sintering, compared to the initial alloy. It has been shown that samples, obtained using double sintering with a tungsten nanopowder modifier (2.5%), have higher values of strength (more than 80%) and hardness (more than 13%), compared to modified samples, obtained by single-stage sintering technology. Thus, the modification of a 2.5 % nanoprobe of tungsten carbide, a widely used structural powder alloy based on iron PC70D3 allows for a significant change in mechanical properties. The use of powder alloys in double sintering technology provides the material hardness and the strength increase.

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Study on effect of dielectric gas type on electrical discharge erosion synthesis of tungsten carbide nanopowder

Cited by 7 publications

References 28 publications

Comparative analysis of the tool life of submicron hard alloy WC-10Co sintered from powder obtained by electro discharge in oil

Comparative analysis of the tool life of submicron hard alloy WC-10Co sintered from powder obtained by electro discharge in oil

Influence of Liquid Composition and Discharge Energy on Process Performance, Composition, and Properties of Particles Formed During Electric Discharge Erosion of WC-5TiC-10Co Alloy

Investigation of the Effect of Tungsten Carbide (WC) Nanopowder on Iron-Based Powder Structural Materials

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