Patents by Inventor Francisco Guitián Rivera

Francisco Guitián Rivera has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process for obtaining silicon nitride (SIN) surface coatings on ceramic components and pieces
    Patent number: 7651726
    Abstract: A process of obtaining silicon nitride (Si3N4) surface coatings on ceramic pieces and components by impregnation of the surfaces of the ceramic pieces with silicon powder suspensions with a particle size preferably less than 200 ?m. The thickness of the coatings depends on the impregnation time and on the properties of the slip and the ceramic piece. The subsequent nitridation of the coating by thermal treatment at temperatures between 1300° C. and 1500° C. in N2 atmospheres leads to a continuous Si3N4 coating. The chemical stability and compatibility between Si3N4 and molten silicon enables its application in silicon metallurgy, in manufacturing crucibles for silicon fusion or for housing said molten silicon, in manufacturing pipes and chutes for its transport or in manufacturing different components for its subsequent purification.
    Type: Grant
    Filed: February 18, 2004
    Date of Patent: January 26, 2010
    Assignee: Universidade de Santiago de Compostela
    Inventors: Alejandro Souto Serantes, Francisco Guitián Rivera, Javier Bullón Camarasa
  • Method of obtaining surface coatings of silicon nitride(si3n4)on ceramic components and parts
    Publication number: 20060251816
    Abstract: A process of obtaining silicon nitride (Si3N4) surface coatings on ceramic pieces and components by impregnation of the surfaces of the ceramic pieces with silicon powder suspensions with a particle size preferably less than 200 ?m. The thickness of the coatings depends on the impregnation time and on the properties of the slip and the ceramic piece. The subsequent nitridation of the coating by thermal treatment at temperatures between 1300° C. and 1500° C. in N2 atmospheres leads to a continuous Si3N4 coating. The chemical stability and compatibility between Si3N4 and molten silicon enables its application in silicon metallurgy, in manufacturing crucibles for silicon fusion or for housing said molten silicon, in manufacturing pipes and chutes for its transport or in manufacturing different components for its subsequent purification.
    Type: Application
    Filed: February 18, 2004
    Publication date: November 9, 2006
    Applicant: Universidade de Santiago de Compostela
    Inventors: Alejandro Souto Serantes, Francisco Guitian Rivera, Javier Bullon Camarasa