Process for producing acicular ferromagnetic alloy particles and

Details Process for producing acicular ferromagnetic alloy particles and Process for producing acicular ferromagnetic alloy particles and

1981-07-23

1983-09-27

Stallard, W.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 05BA, 148105, B22F 102, B22F 918

Patent

active

044066945

ABSTRACT:
A process for producing an acicular ferromagnetic alloy particles mainly containing iron and magnesium, which comprises preparing a suspension of iron(II) hydroxide and water-soluble magnesium salt, the suspension having a pH value of at least 11 and containing the magnesium salt in an amount of 0.5 to 20.0 atomic % based on the amount of the iron(II) hydroxide in the suspension and calculated as the ratio of Mg to Fe(II), oxidizing the suspension with an oxygen-containing gas to form an acicular particles of iron(III) oxide hydroxide substituted with magnesium, forming coats of phosphorus compound and subsequent silicon compound on the acicular particles, heating the resultant particle at 500.degree. to 900.degree. C. under a non-reducing atmosphere and then reheating the particle thus treated at 350.degree. to 600.degree. C. under reducing atmosphere.

REFERENCES:
patent: 4290799 (1981-09-01), Schroeder et al.
patent: 4323596 (1982-04-01), Buxbaum
patent: 4347291 (1982-08-01), Tokuoka
Japan Society of Powder and Powder Metallurgy, 1974, Journal of the Japan Society of Powder and Powder Metallurgy, pp. 108-109. Translation provided.

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