Nanodispersed powders: Synthesis methods and practical applications

Стороженко, П. А.; Guseinov, Sh. L.; Malashin, S. I.

doi:10.1134/s1995078009050024

Cited by 26 publications

(12 citation statements)

References 3 publications

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“…(5) and (6), experimental val ues n, k, and K or for polishing nonferrous metals are obtained (table). It is revealed that the lowest value of surface roughness, R a 0.005 μm, exists at K or equal to 0.04-0.06.…”

Section: Resultsmentioning

confidence: 99%

“…For final polishing, abrasive nanodispersed materials are applied with high hardness, for instance, nanodia mond natural and synthesized powders, as well as boron and silicon carbides, cubic boron nitride with grain sizes from 0.01-0.3 μm to 6-10 μm; in addition, ultramicropowders based on aluminum oxide (corun dum) and silicon dioxide are also applied [1][2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Final polishing of metals to obtain nanoroughened surface

Koroleva

2012

Nanotechnol Russia

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The concept of the final polishing of hardened steels and nonferrous metals using nanodispersed tri bochemically active abrasives based on solid solutions of aluminum and iron oxides is set out in terms of mechanical chemistry. It is demonstrated that the polishing velocity and quality of metals are determined by the formation of an oxide film on their surface and its removal. In order to describe polishing kinetics, the equations for heterogeneous processes are applied. It is shown that the application of these abrasive materials reduces the number of finishing operations with the achievement of a surface roughness no higher than R a 0.005 µm.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Final polishing of metals to obtain nanoroughened surface

Koroleva

2012

Nanotechnol Russia

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“…For this purpose, surface processing is applied, with the last stage being final polishing with the use of abrasive nanodispersed materials, such as natural and synthetic nanodiamond powders, boron or silicon carbides, cubic boron nitride and ultradispersed powders based on aluminum oxide (corundum) and silicon dioxide with a granularity ranging between 0.01 to 0.3 and 6 to10 µm [1][2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Nanoparticulate Zirconia-Modified Solid Solutions of Aluminum-Iron Oxides for Polishing Titanium Metal

Koroleva¹

2015

DREAM

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A synthesis mechanism of nanoparticulate zirconia-modified Al 2-x Fe x O 3 solid solutions has been studied with the application of X-ray diffraction, IR spectroscopy, DTA, particle-size analysis and chemical analysis. The solid solutions have been prepared via heat treatment of ammonium hydroxycarbonate complexes. The nanoparticles are shown to consist of crystalline rhombohedral α-Al 2-x Fe x O 3 , monoclinic and tetragonal (M-ZrO 2 and T-ZrO 2 ). The synthesized mixed oxide offers a high polishing ability (3 to 4.5 times as high), as demonstrated in polishing of titanium, and ensures surface roughness values R a ranging between 0.019 and 0.009 μm.

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“…In recent years, in the fi eld of materials science new direction associated with production of nanopowders, examination of their properties and the creation of a variety of materials based on them [1] is intensively developed. Nanoparticle powders are characterized by unique properties, and their application is extremely broad.…”

mentioning

confidence: 99%

“…Nanoparticle powders are characterized by unique properties, and their application is extremely broad. They are used as functional additives and activators in the polymerization, reaction modifi ers in composites, and other materials [1]. For example, the use of nanosized fi llers in the production of composites allows developing new classes of structural materials with improved operational parameters [2].…”

mentioning

confidence: 99%

Evaluation of filler particle size within polymer matrix by optical spectroscopy

2014

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Polymer composites with inorganic fi llers of different nature, concentration, particle size and shape were studied by optical spectroscopy (UV, visible, and IR ranges), optical and electron microscopy, and dynamic light scattering. An experiment to determine the size of the fi ller particles in aqueous suspension in the polymer matrix of a composite and directly in powders was conducted. It was shown that with increasing concentration aggregation of particles on drying an aqueous slurry occurs to a greater extent than for the fi ller in the polymer composite. It was demonstrated by examples that the optical spectroscopy can be successfully used for the analysis of sub-micron and micron sized fi ller particles in a polymer matrix or suspension.In recent years, in the fi eld of materials science new direction associated with production of nanopowders, examination of their properties and the creation of a variety of materials based on them [1] is intensively developed. Nanoparticle powders are characterized by unique properties, and their application is extremely broad. They are used as functional additives and activators in the polymerization, reaction modifi ers in composites, and other materials [1]. For example, the use of nanosized fi llers in the production of composites allows developing new classes of structural materials with improved operational parameters [2].It is well known [3] that the effi ciency of polymer modifi cation by dispersed particles depends on the characteristics of the fi ller such as particle size and shape, their volume fraction, particle size distribution, surface properties of the fi ller (surface area of the particle, its porosity, surface charge, the presence of functional groups on surface), the uniform distribution of the fi ller particles in the matrix volume, and others. The stability of the physical properties of the obtained materials is achieved by careful monitoring of the fractional composition of the fi ller. At the same time it is important not only the accuracy but also the speed of evaluation of the geometrical parameters of the fi ller particles. In practice, there are many ways to determine the particle size of a powder: sieving, sedimentation, and centrifugal methods, methods of optical and electron microscopy, dynamic light scattering method, the method of laser diffraction analysis [4][5][6].It should be noted that aggregation of nanofiller particles into larger formation occurs in the process of manufacturing the dispersion-fi lled polymer composites [7]. The process of aggregation of the particles affects the properties of composites. Aggregation of particles leads to a need to calculate the average particle diameter, since this parameter affects a value of the gap between the particles, which, for example, determines the level of structural strength and mechanical properties of the material. Therefore, monitoring of the concentration and size of aggregates of the fi ller particles, as well as their size distribution is very important in the stage of preparation ...

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Nanodispersed powders: Synthesis methods and practical applications

Cited by 26 publications

References 3 publications

Final polishing of metals to obtain nanoroughened surface

Final polishing of metals to obtain nanoroughened surface

Nanoparticulate Zirconia-Modified Solid Solutions of Aluminum-Iron Oxides for Polishing Titanium Metal

Evaluation of filler particle size within polymer matrix by optical spectroscopy

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