摘要:
Isometric cobalt- and titanium-containing magnetic iron oxides are prepared by reacting acicular iron(III) oxide hydroxides with compounds of divalent cobalt and iron and compounds of tetravalent titanium in aqueous alkaline suspension at elevated temperature.
摘要:
A process for the preparation of finely divided and acicular hexagonal ferrites of the general formula AMe.sub.x Fe.sub.12-x O.sub.19, where x is .ltoreq.4, A is barium and/or strontium and Me is indium or equimolar amounts of zinc or cobalt and titanium, and their use for the production of magnetic recording media and plastoferrites.
摘要:
Finely divided ferrite powder of the general formulaCo.sub.x Fe.sub.3-x O.sub.4.5-0.5 xwhere x is from greater than zero to one, having an essentially isotropic particle shape, is prepared by oxidation of ferrite powder of the composition Co.sub.x Fe.sub.3-x O.sub.4, where x has the same limits, with an oxygen-containing gas at from 150.degree. to 500.degree. C.
摘要:
A process for the preparation of barium ferrite of the formula BaFe.sub.12 O.sub.19 by reacting an aqueous solution or suspension of a barium salt and an aqueous solution of an iron(III) salt with an aqueous sodium carbonate solution, removing the solvent, heating the dry salt mixture to below the melting point of the sodium salt present, but to not less than 680.degree. C., and isolating the resulting finely divided, platelet-like barium ferrite from the barium ferrite/sodium salt mixture by leaching with water.
摘要:
Ferromagnetic metal particles of substantially iron are prepared by starting from an acicular .alpha.-FeOOH, applying a shape-stabilizing finish to the particle surface, heating at 500.degree.-850.degree. C. and subsequently reducing with gaseous reducing agents at 200.degree.-500.degree. C. to the metal, and starting .alpha.-FeOOH being prepared in the presence of zinc and phosphate ions.
摘要:
Acicular ferromagnetic metal particles consisting essentially of iron are prepared by a process wherein acicular iron(III) oxide hydroxide provided with a shape-stabilizing surface coating, or iron(III) oxide obtained therefrom by dehydration, is reduced by means of a decomposable organic compound and hydrogen.
摘要:
A process for stabilizing pyrophoric acicular metal particles consisting essentially of iron, by reaction with oxygen-containing gases in two stages, wherein, in the first stage, up to 1/3 of the passivating layer present in the final state is formed at from 25.degree. to 45.degree. C. and, in a subsequent second stage, the remainder of the passivating layer is formed at from 50.degree. to 70.degree. C.
摘要:
Acicular ferromagnetic chromium dioxide is stabilized by treatment with an alkali metal hydroxide in an aqueous alkaline suspension at elevated temperatures.
摘要:
A process for the manufacture of acicular ferrimagnetic iron oxide by reducing heat-treated acicular iron(III) oxide hydroxide with an organic compound which decomposes in the presence of iron oxide at from 450.degree. to 650.degree. C., followed by at least partial oxidation with an oxygen-containing gas at from 200.degree. to 500.degree. C., wherein the iron(III) oxide hydroxide employed is heat-treated at from 450.degree. to 700.degree. C. and has a surface area, measured by the BET method, of from 10 to 23 m.sup.2 /g.