Patents by Inventor Duqing Zhang

Duqing Zhang 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).

  • Pretreatment method for improving antioxidation of steel T91/P91 in high temperature water vapor
    Patent number: 8367162
    Abstract: Disclosed is a pretreatment method for improving antioxidation of steel T91/P91 in high temperature water vapor, which includes applying a slurry, containing rare earth oxide, on a surface of a substrate; holding the temperature in a gas mixture environment of inert gas and water vapor after drying; and cleaning away the solid powder left by the slurry on the surface, thereby obtaining the substrate with a surface rich in chromium and having a small amount of rare earth oxide. As a result of the method, the antioxidation capability of steel T91/P91 in the 500-750° C. water vapor environment can be improved, and films rich in chromium oxide can be formed on the surface of steel T91/P91.
    Type: Grant
    Filed: February 17, 2011
    Date of Patent: February 5, 2013
    Assignees: Shandong Electric Power Research Institute, State Grid Corporation of China
    Inventors: Duqing Zhang, Guangming Liu, Guangcheng Zhang
  • PRETREATMENT METHOD FOR IMPROVING ANTIOXIDATION OF STEEL T91/P91 IN HIGH TEMPERATURE WATER VAPOR
    Publication number: 20120070574
    Abstract: Disclosed is a pretreatment method for improving antioxidation of steel T91/P91 in high temperature water vapor, which includes applying a slurry, containing rare earth oxide, on a surface of a substrate; holding the temperature in a gas mixture environment of inert gas and water vapor after drying; and cleaning away the solid powder left by the slurry on the surface, thereby obtaining the substrate with a surface rich in chromium and having a small amount of rare earth oxide. As a result of the method, the antioxidation capability of steel T91/P91 in the 500-750° C. water vapor environment can be improved, and films rich in chromium oxide can be formed on the surface of steel T91/P91.
    Type: Application
    Filed: February 17, 2011
    Publication date: March 22, 2012
    Applicant: SHANDONG ELECTRIC POWER RESEARCH INSTITUTE
    Inventors: Duqing Zhang, Guangming Liu, Guangcheng Zhang