Alternative Method for Determining Compressibility of Powder Systems

Minitsky, A. V.; Лобода, П. І.

doi:10.1007/s11106-017-9912-6

Cited by 3 publications

(2 citation statements)

References 5 publications

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“…We used the iron powder of brand PZHRV200.28 delivered as is; pressing it from the state of the stillage was carried out in a separate steel mold with an output working diameter of 10 mm. For a two-side single-stage pressing, we placed the mold with the embedded lower punch on rubber plates in advance, then filled it with batches of the same mass, 8.0 g. Then we pressed the batches and inserted the upper punch, then we carried out pressing (at pressures of 200, 400, 600, and 800 MPa) and unpressed the sample, a cylindrical green compact, according to the methodology given in work [13].…”

Section: Materials and Methods To Study Iron-based Green Compactsmentioning

confidence: 99%

Determining the influence exerted by the static conditions of final squeezing on the compaction process of iron-based powder materials

Minitsky

Minitska

Okhrimenko

et al. 2021

EEJET

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This paper reports a study into the process of re-compaction of powder briquettes in the conditions of static pressing at a pressure of 800 MPa. The technological parameters of the pressing process have been analyzed, which make it possible to improve the compaction of powder briquettes based on iron. Such parameters are the outer greasing, which reduces friction between a green compact and the walls of the press tool matrix, and the firing, which removes the deformation strengthening of the green compacts and increases their plasticity. The green compacts’ sealing mechanism involved in the final squeezing process has been established, which is associated with the grinding of pre-compressed particles due to the strain in the contact areas. The increase in the stressed state of green compacts following the final squeezing was confirmed by the results of studying the residual micro-strains. The change in the stressed state of iron green compacts has been confirmed by the study into the structurally sensitive characteristics, which include the materials’ magnetic and electrical properties. Determining the magnetic characteristics has shown that final squeezing leads to an increase in coercive force, which can be explained by both the increase in the stressed state and the grinding of grains. Investigating the impact exerted by the annealing environment on the value of magnetic characteristics has demonstrated that annealing in hydrogen is more effective in terms of improving magnetic properties than annealing in a vacuum. This is due to the refining of grain boundaries through the processes of reduction of oxide films. The study of the mechanical characteristics of green compact materials based on iron powder has established that final squeezing leads to an increase in the hardness and strength of materials depending on the conditions of deformation. A significant improvement in the green compacts’ strength (820‒824 MPa) is due to both a decrease in porosity by 8‒10 % and an increase in the contact area as a result of plastic deformation after the annealing

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Section: Materials and Methods To Study Iron-based Green Compactsmentioning

confidence: 99%

Determining the influence exerted by the static conditions of final squeezing on the compaction process of iron-based powder materials

Minitsky

Minitska

Okhrimenko

et al. 2021

EEJET

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“…A TiH 2 powder sample weighing 11 g was loaded into the die. To reduce external contact friction, the die channel was evenly lubricated with adipose with a high molecular weight and a high content of stearic acid (pursuant to the procedure described in [14]) prior to loading each sample. The sample was subjected to single-stage (without additional compaction) double-action pressing; the lower punch was inserted into the die before the powder sample was loaded.…”

Section: Methodsmentioning

confidence: 99%

Pressing of Long-Length Pellets From Titanium Hydride Powder

Minitsky

Лобода

2018

Powder Metall Met Ceram

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The paper examines pressing of the titanium hydride powder in a die lubricated with adipose to produce pellets with H/d  4/1 and additional compaction of these pellets with a combined lubricant separating them from the die. The pellet extrusion pressure in the additional compaction process is one order of magnitude lower than when the powder is pressed in a lubricated die. This is indicative of drastic decrease in the external contact friction during additional compaction. Compaction of the titanium hydride powder mixed with a water-soluble organic lubricant has been experimentally studied.

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