Preparation of materials from aluminum oxide nanopowders using modern methods of consolidation

Kislyi, P. S.; Gevorkyan, É. S.; Shkuropatenko, V.A.; Gutsalenko, Yuriy

doi:10.3103/s1063457610060031

Cited by 5 publications

(2 citation statements)

References 3 publications

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“…The search for superhard and ultra-incompressible materials is of great interest and importance in science and technology because these materials find applications for coatings on cutting tools or as abrasives and polishing media. Despite significant advances in the field of synthesis of very hard materials diamond is still considered to be the hardest material when considering its Vickers hardness (60–150 GPa) − as well as its bulk modulus (433–442 GPa). − ,, These properties are ascribed to the directional bonding in covalent networks of atoms coordinated by a small number of ligands with short interatomic distances. So called low Z compounds consisting of atoms with small atomic numbers, such as Be, B, C, N, O, Al, Si, or P fulfill these criteria.…”

Section: Introductionmentioning

confidence: 99%

Materials Properties of Ultra-Incompressible Re₂P

et al. 2012

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ABSTRACT:In situ high-pressure X-ray powder diffraction measurements on Re 2 P up to 37.0 GPa at ambient temperature in diamond-anvil cells were carried out at two different synchrotron facilities (ESRF and DESY). The compressibility of Re 2 P (Pnma, no. 62, a = 5.5464(17), b = 2.9421(8), c = 10.0483(35) Å, V = 163.97(9) Å 3 , Z = 4, R p = 0.1008, wR p = 0.1341 at ambient conditions) was investigated and resulted in a bulk modulus of B 0 = 320(10) GPa after fitting the experimental p-V data to a second-and third-order Birch-Murnaghan equation of state. In addition, the determined bulk modulus is compared to values obtained from an Eulerian strain versus normalized stress plot with values ranging form 315(7) to 321(15) GPa. These experimental findings are confirmed by DFT-calculations ranking Re 2 P amongst ultra-incompressible materials. However, the Vickers hardness of a highpressure sintered Re 2 P-Re x C y composite material in the asymptotic hardness region was found to be of only 13(2) GPa. Electrical conductivity measurements indicate that metallic Re 2 P exhibits Pauli-paramagnetism. Analysis of temperature-dependent in situ Xray diffractometry reveals an approximately isotropic expansion of the lattice parameters with a thermal expansion coefficient of (α(V) = 28.5-32.8(2)·10 -6 K -1 ).

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Section: Introductionmentioning

confidence: 99%

Materials Properties of Ultra-Incompressible Re₂P

et al. 2012

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“…Influence of technology of nanopowder production on the microstructure of the sintered by sparkplasma material on the example of aluminum oxide 1.Introduction Production of bulk materials by spark-plasma powders sintering having a nanostructure, allows to control formation of the microstructure of the sintered material and to achieve unique strength and special properties due to the short duration of the process [1][2][3][4][5]. At the same time a significant influence on the properties of the sintered material has a technology of obtaining initial nanopowder.…”

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confidence: 99%

Influence of technology of nanopowder production on the microstructure of the sintered by spark-plasma material on the example of aluminum oxide

Zholnin

Мелехов

Hafizov

et al. 2016

IOP Conf. Ser.: Mater. Sci. Eng.

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Properties of tungsten heavy alloys, prepared by spark-plasma sintering N S Ermakova, M S Yurlova and E G Grigoryev -Strength analysis of small-sized thin ceramic discs obtained by spark-plasma sintering E V Nefedova, V I Goltsev, E G Grigoryev et al. E-mail: azholnin@list.ruAbstract. A comparative study of the results of spark-plasma sintering (SPS) of two-types of aluminum oxide nanopowders, obtained by the method of conductor explosion and plasma synthesis. When the parameters of both powders are similar (spherical form of the particles, size, phase composition) as well as SPS modes the properties of the resulting compacts are significantly different both in mechanical properties and microstructure. The reason of differences in the properties of the obtained compacts is in technological impurities in powders, obtained by different methods. Artificial addition of impurities, contained in the nanopowder, obtained by electro explosion of conductor, into the powder, made by synthesis in plasma and not containing these impurities, allowed to reveal their effect on the formation of the microstructure and properties of the sintered by SPS method sample.

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