Title:
反応物間の熱反応を実施する方法及びそのための加熱炉
Document Type and Number:
Japanese Patent JP2004534929
Kind Code:
A
Abstract:
The present invention relates to thermal reactions performed at rapid transient temperatures, and a furnace (1) able to perform such reactions. The method and the furnace may suitably be applied to perform reactions between reactants where significant losses normally occur at certain transient temperatures or temperature ranges. One practical application of the present invention relates to a carbothermic method for producing Refractory Hard Metal powders, such as borides, nitrides and carbides, and a furnace designed for the performance of the method. In accordance with this method Refractory Hard Metal powders, such as boride powders can be produced with reduced loss of reactants such as C and B2O3. This can be achieved by rapid heating of the mixture containing the reactants in a critical temperature range. For the performance of this particular embodiment a two-step furnace has been applied, where the temperature in each individual temperature zone (37, 38) Is respectively below and above critical temperatures of the reaction. In accordance with one embodiment of the present invention high purified boride, carbide and nitride powders with a fine grain size can be produced in a simple and cost effective manner.
More Like This:
Inventors:
Yovrebyo, Darg
Clark, William George
Clark, William George
Application Number:
JP2002565896A
Publication Date:
November 18, 2004
Filing Date:
February 06, 2002
Export Citation:
Assignee:
NORSK HYDRO ASA
International Classes:
B01J19/18; C01B21/06; C01B21/076; C01B31/30; C01B35/04; F27B7/00; F27B7/06; F27B7/34; F27B9/06; F27D3/12; F27B7/26; F27D5/00; F27D19/00; F27D99/00; (IPC1-7): F27B9/06; B01J19/18; C01B21/06; C01B31/30; C01B35/04; F27B7/00; F27D3/12
Attorney, Agent or Firm:
Michiteru Soga
Michiharu Soga
Hidetoshi Furukawa
Suzuki Kenchi
Kajinami order
Michiharu Soga
Hidetoshi Furukawa
Suzuki Kenchi
Kajinami order