Patents Assigned to Crusin AS
  • Mould parts of silicon nitride and method for producing such mould parts
    Patent number: 7422631
    Abstract: The present invention relates to silicon nitride mould parts, particularly crucibles for use in connection with directional solidification and pulling of silicon single crystals. The mould parts consist of Si3N4 having a total open porosity between 40 and 60% by volume and where more than 50% of the pores in the surface of the mould parts have a size which is larger than the means size of the Si3N4 particles. The invention further relates to a method for producing the silicon nitride mould parts.
    Type: Grant
    Filed: August 13, 2003
    Date of Patent: September 9, 2008
    Assignee: Crusin AS
    Inventors: Espen Olsen, Arve Solheim, Havard Sorheim