| 摘要 |
PURPOSE:To obtain the titled fine powder, useful as black pigments, electrically conductive materials, catalysts, raw material powder for sintered materials, etc., and having excellent dispersibility, coloring property and heat resistance, by reducing ultrafine particulate TiO2 powder which is a cubic crystal in a blended H2-N2 gas atmosphere while heating. CONSTITUTION:TiO2 powder which is a cubic crystal having 0.01-0.04mum particle diameter in an ultrafine particle state is heat-treated, reduced and fired in a blended gas atmosphere consisting of 10-95vol.% H2 and 90-5vol.% N2 at 700-1,100 deg.C for 2-3hr to afford the titled powder having 8-10 color tone (L value), sufficient blackness and 0.02-0.05mu particle diameter.
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