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Plasma-chemical synthesis of ultradispersed iron oxides with pigment qualification

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Abstract

The conditions are investigated for preparing ultradispersed iron oxides with pigment qualification (iron oxide pigments) via oxidation in electric arc low temperature plasma (LTP) of: iron dichloride (crystal hydrate), iron sulfate (monohydrate), roughly dispersed iron and burnt pyrites. Using a simplified one-dimensional model, calculations are made describing the motion, heating, melting and evaporation of iron particles of <50 μm size; these agree well with experimental results. A procedure is proposed for formation of ultradispersed particle (UDP) structures. Depending on the plasma-chemical process (PCP) parameters, one can control the specific surface (dispersity) of the pigments. The influence is studied of aluminium and aluminium oxide additives on the pigmental properties of iron oxides. Depending on the PCP conditions and the UDP dispersity, the pigment's colour varies from black through dark brown, red-brown, red-violet to light brown. The pigment possesses high surface coverage combined with medium oil absorption and good compatibility with other pigments.

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Vissokov, G.P., Pirgov, P.S. Plasma-chemical synthesis of ultradispersed iron oxides with pigment qualification. JOURNAL OF MATERIALS SCIENCE 31, 4007–4016 (1996). https://doi.org/10.1007/BF00352662

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  • DOI: https://doi.org/10.1007/BF00352662

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