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Submicrometer Silica Spheres Generated by Laser Fuming

C.M. Gomes, R. Müller, J. Günster, T. Mühler, R. Görke, J.G. Heinrich

Journal of Ceramic Science and Technology, Vol. 4, No. 1 (2013), pp. 11-18

DOI: 10.4416/JCST2012-00033

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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.

Keywords

Laser, SiO2, nanopowder

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