Patents Assigned to ELKEM CARBON AS
  • Patent number: 10131997
    Abstract: The present invention relates to a method for production of graphite bodies. Carbon bodies are formed from a mixture of electric calcined coke particles calcined at a temperature between 1200 and 3000° C. and a binder where the coke particles have sulphur-and nitrogen content varying between 0 and 1.5% by weight and where the coke particles have an average sulphur content less than 0.6% by weight and a nitrogen content of less than 0.6% by weight, baking of the carbon bodies at a temperature between 700 and 1400° C. and graphitizing of the baked carbon bodies at a temperature above 2300° C.
    Type: Grant
    Filed: January 18, 2011
    Date of Patent: November 20, 2018
    Assignee: ELKEM CARBON AS
    Inventors: Johan Arnold Johansen, Sten Yngve Larsen, Hermann Gran
  • Patent number: 8748524
    Abstract: The present invention relates to a heat crucible glue or coating for use in connection with refractory materials and ceramics. The glue or coating comprises 25 to 50 weight % silicon powder, 5 to 20 weight % SiC powder, 20 to 60 weight % formaldehyde resin or polyfurfuryl alcohol and 10 to 30 weight % of an organic solvent.
    Type: Grant
    Filed: October 13, 2011
    Date of Patent: June 10, 2014
    Assignee: Elkem Carbon AS
    Inventors: Bjorn Egeland, Alf Håberg, Johan Arnold Johansen, Stian Madshus
  • Patent number: 8535581
    Abstract: The present invention relates to an induction furnace for melting of metals that do not connect inductively in solid state. The induction furnace has a lining comprising a mixture of graphite and silicon carbide and has an electric conductivity higher than the electrical conductivity of the metal to be melted when metal is in solid state, but lower than the electrical conductivity of the metal to be melted when the metal is in molten state. The invention further relates to a lining for induction furnace and to a method for producing such lining.
    Type: Grant
    Filed: April 26, 2012
    Date of Patent: September 17, 2013
    Assignee: Elkem Carbon AS
    Inventors: Bjørn Egeland, Alf Håberg, Stian Madshus, Johan Arnold Johansen
  • Publication number: 20130004410
    Abstract: The present invention relates to a method for production of graphite bodies. Carbon bodies are formed from a mixture of electric calcined coke particles calcined at a temperature between 1200 and 3000° C. and a binder where the coke particles have sulphur-and nitrogen content varying between 0 and 1.5% by weight and where the coke particles have an average sulphur content less than 0.6% by weight and a nitrogen content of less than 0.6% by weight, baking of the carbon bodies at a temperature between 700 and 1400° C. and graphitizing of the baked carbon bodies at a temperature above 2300° C.
    Type: Application
    Filed: January 18, 2011
    Publication date: January 3, 2013
    Applicant: ELKEM CARBON AS
    Inventors: Johan Arnold Johansen, Sten Yngve Larsen, Hermann Gran
  • Publication number: 20120205829
    Abstract: The present invention relates to an induction furnace for melting of metals that do not connect inductively in solid state. The induction furnace has a lining comprising a mixture of graphite and silicon carbide and has an electric conductivity higher than the electrical conductivity of the metal to be melted when metal is in solid state, but lower than the electrical conductivity of the metal to be melted when the metal is in molten state. The invention further relates to a lining for induction furnace and to a method for producing such lining.
    Type: Application
    Filed: April 26, 2012
    Publication date: August 16, 2012
    Applicant: ELKEM CARBON AS
    Inventors: Bjørn EGELAND, Alf HÅBERG, Stian MADSHUS, Johan Arnold JOHANSEN
  • Publication number: 20120088876
    Abstract: The present invention relates to a heat crucible glue or coating for use in connection with refractory materials and ceramics. The glue or coating comprises 25 to 50 weight % silicon powder, 5 to 20 weight % SiC powder, 20 to 60 weight % formaldehyde resin or polyfurfuryl alcohol and 10 to 30 weight % of an organic solvent.
    Type: Application
    Filed: October 13, 2011
    Publication date: April 12, 2012
    Applicant: ELKEM CARBON AS
    Inventors: Bjørn EGELAND, Alf HÅBERG, Johan Arnold JOHANSEN, Stian MADSHUS
  • Publication number: 20110192254
    Abstract: The present invention relates to an induction furnace for melting of metals that do not connect inductively in solid state. The induction furnace has a lining comprising a mixture of graphite and silicon carbide and has an electric conductivity higher than the electrical conductivity of the metal to be melted when metal is in solid state, but lower than the electrical conductivity of the metal to be melted when the metal is in molten state. The invention further relates to a lining for induction furnace and to a method for producing such lining.
    Type: Application
    Filed: April 20, 2011
    Publication date: August 11, 2011
    Applicant: ELKEM CARBON AS
    Inventors: Bjørn EGELAND, Alf HÅBERG, Stian MADSHUS, Johan Arnold JOHANSEN