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Submicrometer Silica Spheres Generated by Laser Fuming
C.M. Gomes1, R. Müller1, J. Günster1, T. Mühler2, R. Görke2, J.G. Heinrich2
1 BAM Federal Institute of Materials Research and Testing, Unter den Eichen 87, 12205 Berlin, Germany
2 Clausthal University of Technology, Institute of Nonmetallic Materials, Zehntnerstr. 2a, 38678 Clausthal-Zellerfeld, Germany
received September 19, 2012, received in revised form January 15, 2013, accepted January 30, 2013
Vol. 4, No. 1, Pages 11-18 DOI: 10.4416/JCST2012-00033
Abstract
The production of agglomerate-free SiO2 particles exhibiting a monomodal distribution of particle sizes of around 300 nm by means of direct laser fuming of micrometric SiO2 powders has been successfully demonstrated. With a 12 kW cw CO2 laser system, a production rate of up to 1 kilogram powder per hour was achieved. Almost ideal spherical amorphous SiO2 particles in a broad particle size distribution between 10 nm and several 100 nm (d50 ≈ 300 nm) were synthesized. Several observations suggest weak agglomeration forces between the particles. A temperature reduction of 200 °C for sintering powder compacts was observed.
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Keywords
Laser, SiO2, nanopowder
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