Results 121 to 130 of about 141,858 (165)

Shaping Fibre Preforms From Prefabricated Powders

SPIE Proceedings, 1987
A process has been developed, for the mechanical shaping of silica fibre preforms. Porous preforms are shaped from prefabricated powders and transfered, to glass rods by thermal treatment. Drawn fibers now have attenuations of 1 dB/km and an OH absorption. of 0.5 dB/km at 138o nm. Both single and multimode fibres have been produced.
R Dorn, A Baumgartner, A Gutu-Nelle, J Koppenborg, W Rehm, S Schneider   +5 more
openaire   +1 more source

Electrospark powders of shape memory alloys

Powder Metallurgy and Metal Ceramics, 2007
Powders of Ti-Ni and Ni-Mn-Ga alloys are obtained by the electrospark method. It is established that the largest particles are of irregular shape and the smaller ones are spherical. Some spherical particles are hollow. No carbon contamination is found within the Ti-Ni and Ni-Mn-Ga powders obtained in cryogen liquids.
G. E. Monastyrskii, Yu. N. Koval’, A. P. Shpak, R. Ya. Musienko, V. I. Kolomytsev, A. A. Shcherba, S. N. Zakharchenko, P. G. Yakovenko   +7 more
openaire   +1 more source

Preparation of nanotube-shaped TiO2 powder

Journal of Crystal Growth, 2001
Abstract Nanotube-shaped TiO2 powder was synthesized by a digestion of the crystalline powder obtained from the heat treatment of the titanium hydroxide precipitates. The influence of the crystalline phase and the digestion temperature on the formation of the TiO2 nanotube was investigated.
Dong-Seok Seo, Jong-Kook Lee, Hwan Kim
openaire   +1 more source

Metal Powder Production and Powder Size and Shape Distribution

2020
Abstract This article provides an overview of the general methods of metal powder production. It details the primary methods for particle sizing used in additive manufacturing: sieving, laser diffraction and scattering, and digital image analysis.
openaire   +1 more source

Unusual shape formation in aerosol powder particles

Refractories and Industrial Ceramics, 2011
With electron microscope study of powder of the composition ZrO 2 + 3 mol.% Y 2 O 3 , prepared by spray pyrolysis from solution, containing exothermic reaction initiators, a particle configuration not previously detected is observed, i.e., a thin-walled shell filled with fine spherical particles. Possible mechanisms are discussed for formation of these
A. V. Galakhov, L. V. Vinogradov, V. I. Antipov, N. A. Alad’ev, A. G. Kolmakov   +4 more
openaire   +1 more source

Near Net Shaping with Bimodal Powders on Shaped Membranes via EPD

Key Engineering Materials, 2009
The electrophoretic deposition (EPD) is a very promising process for shaping compacts, especially for nanopowders. Up till now EPD is not used on a large-scale production of ceramic products. Additionally, the higher cost of nanopowders was also a barrier for the development of new products. As the deposition rate at EPD is independent of particle size,
Rolf Clasen, Christian Oetzel
openaire   +1 more source

Choice of optimum magnetoabrasive powder particle shape

Soviet Powder Metallurgy and Metal Ceramics, 1983
The choice of particle shape of a MAP is determined to a large extent by the hardness of its structural components and by the machinability of the metal to be polished. In the magnetoabrasive polishing of quenched steels and other hard materials, e.g., hard metals, the best results are obtained with a MAP whose particles consist of a ferromagnetic ...
V. E. Oliker, A. F. Zhornyak, T. Ya. Gridasova   +2 more
openaire   +1 more source

Photopolymerization of powder suspensions for shaping ceramics

Journal of the European Ceramic Society, 2011
Abstract The photopolymerization of suspensions of ceramic powders in monomer solutions is the fundamental step for forming techniques where a liquid suspension is solidified with UV light. The photopolymerization behavior is determined by the properties of the monomer and photoinitiator and by the transport of photons in the suspension.
John W. Halloran, Vladislava Tomeckova, Susan Gentry, Suman Das, Paul Cilino, Dajun Yuan, Rui Guo, Andirudh Rudraraju, Peng Shao, Tao Wu, Taiwo R. Alabi, Wil Baker, Daira Legdzina, Dennis Wolski, Walter R. Zimbeck, David Long   +15 more
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Shape memory TiNi synthesis from elemental powders

Materials Science and Engineering: A, 1994
Abstract Commercially, the shape memory alloy TiNi is produced either by vacuum induction melting or by vacuum arc remelting of the pure metal ingots. Powder metallurgy techniques provide an alternative fabrication route but problems arise in achieving chemical homogeneity.
J.C. Hey, A.P. Jardine
openaire   +1 more source

Image Analysis of the Shape of Granulated Powder Grains

Journal of Pharmaceutical Sciences, 2004
This study presents and evaluates two new form factors for the characterization of pharmaceutical microparticles using image analysis techniques. The first factor, denoted Vr, is mean percentage variation in radial chord length (for a large number of radial chords drawn at small angular intervals) with respect to mean radial chord length.
Sergio, Almeida-Prieto, José, Blanco-Méndez, Francisco J, Otero-Espinar   +2 more
openaire   +2 more sources