Mathematical Formalism of Pore Stereology of Powder Materials

Мельник, Виктория Николаевна; Rud, V. D.; Melnik, Yury A.

doi:10.1007/s11106-014-9592-4

Cited by 5 publications

(3 citation statements)

References 4 publications

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“…The processing of sintered porous materials differs from compact steels due to porosity and often inhomogeneous microstructure [16]. It's confirmed by research the pore stereology of powder materials [17] using the original computer-informative software for research of the new materials [18].…”

Section: Literature Reviewmentioning

confidence: 95%

Influence of the Cutting Temperature on the Surface Layer Quality When Grinding Sintered Porous Materials

Zabolotnyi

Bozhko

Machado

et al. 2021

Lecture Notes in Mechanical Engineering

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One of the features of sintered materials is porosity. Depending on the application, this can be both a disadvantage and an advantage. The porosity geometry affects the propagation of heat during the grinding of the sintered material. An experimental study of the temperature in the cutting zone during the grinding of sintered porous materials was carried out. The relationship between the contact temperature in the cutting zone, the parameters of the cutting modes during grinding, and the porosity of the part is revealed. It was found that the use of process coolants is not always possible due to the presence of pores in the material. It is proved that the cutting temperature of porous materials is higher due to the deteriorated heat dissipation properties, but the cutting temperature does not affect the degree of compaction of the surface layers of the powder material. An adequate mathematical model is obtained, which describes the change of cutting temperature depending on the material's cutting depth, grinding speed, and porosity.

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Section: Literature Reviewmentioning

confidence: 95%

Influence of the Cutting Temperature on the Surface Layer Quality When Grinding Sintered Porous Materials

Zabolotnyi

Bozhko

Machado

et al. 2021

Lecture Notes in Mechanical Engineering

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“…Taking into account the complex structure of natural aluminosilicate materials, we can say that traditional methods of quantitative description of structure formation processes fit poorly. Our experience shows that for the registration of weak structural responses of dispersed clay systems, a set of experimental methods is required that simultaneously detect the generation of the secondary phase morphologies at the millimeter, micron, and submicron levels [5]. Along with optical microscopy, which provides images of dispersed samples surfaces, modern computer processing of these images is required, with the help of methods of colorimetric gradation, methods of multifractal and wavelet analyses.…”

Section: Cristalizaram a Composição Do Ambiente Na Câmara De Micromentioning

confidence: 99%

“…3 shows wavelet spectrograms carrying information on the distribution of mesostructural elements (particles) on the surface of powders. The abscissa is the wavelet (3)(4)(5)(6)(7) represents the distribution of larger elements; the upper part (7)(8)(9)(10)(11) gives a generalized picture of the surface. The correlation between the wavelet and the point profile in its vicinity is determined by the color of the corresponding region of the wavelet spectrogram [16]: white is the maximum and dark blue is the minimum of coincidences.…”

Section: Influence Of the External Environment On Structural Changes mentioning

confidence: 99%

Evolution of phase morphology in dispersed clay systems under the microwave irradiation

2018

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The results of a study of the microwave emission effect (power 700 W, frequency 2.45 GHz) on the structural changes in natural clay particles with effective diameters D≤630 μm are presented. The influence of the irradiation time (10 and 20 min) and the environment in the microwave chamber (atmospheric air and air saturated with water vapor) on the structural changes occurring in the particles were traced. During the first 10 min, capillary water was completely removed and agglomeration was carried out by attaching single dispersed particles (diffusion limited aggregation model). At the second stage (10-20 min), the already formed agglomerates grew (cluster-cluster aggregation model). A complex of independent optical-physical methods was used to analyze weak structural changes, including X-ray diffraction analysis, colorimetry and wavelet analysis. This approach increased the information content and reliability of measurements, quantitatively characterizing the structural responses in disperse clay systems. In the air, the removal of capillary water was accompanied by agglomerations of particles and polymorphic transformations of oxides: montmorillonite was completely decomposed and amorphous phases, in particular CaCO3, crystallized. The composition of the environment in the microwave chamber affected the type of phase transformations in iron compounds: iron-aluminum silicate (Fe2Al4Si5O18) was formed in the air; magnetite Fe.Fe2O4 (Fe3O4) appeared in the water vapor medium. The carried-out studies with the developed set of experimental methods indicated the possibility of regulating the processes of structure formation in dispersed clay systems by optimizing the regimes of exposure to microwave radiation.

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Investigation of the Surface Layer Hardness When Grinding Sintered Porous Workpieces

Zabolotnyi

Bozhko

Halchuk

et al. 2022

Lecture Notes in Mechanical Engineering

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Mathematical Formalism of Pore Stereology of Powder Materials

Cited by 5 publications

References 4 publications

Influence of the Cutting Temperature on the Surface Layer Quality When Grinding Sintered Porous Materials

Influence of the Cutting Temperature on the Surface Layer Quality When Grinding Sintered Porous Materials

Evolution of phase morphology in dispersed clay systems under the microwave irradiation

Investigation of the Surface Layer Hardness When Grinding Sintered Porous Workpieces

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