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Coated particles of inorganic or metallic materials and processes of producing the same

  • US 5,489,449 A
  • Filed: 07/18/1994
  • Issued: 02/06/1996
  • Est. Priority Date: 03/28/1990
  • Status: Expired due to Term
First Claim
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1. A process of producing sinterable coated particles of inorganic material in which core particles of a first inorganic material are coated on their surfaces with a powder of ultrafines having a particle size of less than 0.5 μ

  • m of a second inorganic material chemically bonded to the core particles, which comprises generating a powder of ultrafines of the second inorganic material in a vapor phase by a plasma flame in a gas in an ultrafines powder generating zone from a feed supplying material from which the ultrafines are generated to produce the powder of ultrafines in an activated state for chemical combination with the material of the core particles;

    thereafter introducing said powder of ultrafines in the activated state in the gas of the plasma flame and the core particles of the first inorganic material, while being carried by a carrier gas, into a particle contacting zone in which the core particles are brought into contact with the powder of the ultrafines while the ultrafines are in the activated state, thus having the powder of the ultrafines chemically bonded to the core particles in a gas stream comprising the said carrier gas and the gas of the plasma flame; and

    recovering the sinterable coated particles from the gas stream.

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