| 摘要 |
PURPOSE:To obtain easily preparable black powder having high degree of blackness, superior dispersibility, allowing titanium hydroxide or TiO2 powder having deposited V compd. thereon to react with gaseous NH3 by heating. CONSTITUTION:A V compd. (e.g. ammonium vanadate) is deposited on the powder of titanium hydroxide or TiO2. The powder is then allowed to react with gaseous NH3 at 550-900 deg.C to obtain aimed black pigment powder, which consists of particles of oxynitride of Ti and V contg. 0.1-7wt% V, 5-35wt% O, and 2-20wt% N. If a compound body of tetragonal and cubic crystal systems of oxynitride of Ti and V contg. larger proportion of the cubic crystal is used, the degree of blackness may be improved further.
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