Patents by Inventor Dong Sub Sim

Dong Sub Sim 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).

  • Method of producing hardmetal-bonded metal component
    Patent number: 6756009
    Abstract: A method is provided of producing a hardmetal-bonded metal component with an enhanced bond strength. The method comprises the steps of providing an iron-based metal body, mixing and compressing raw material powder of hardmetal and binder powder containing nickel, silicon and boron into a preform, heating and sintering the preform, and applying heat to the sintered body and the iron-based metal body under a state that the sintered body is brought into contact with the iron-based metal body, to thereby cause the sintered body to be bonded to the iron-based metal body. The sintered body and the iron-based metal body are thermally treated at a temperature of 1,000 to 1,200° C. for 30 or more minutes so that boron present in the sintered body is infiltrated into grain boundaries of the iron-based metal body to form a plurality of boride spikes in a bonding interface.
    Type: Grant
    Filed: December 18, 2002
    Date of Patent: June 29, 2004
    Assignee: Daewoo Heavy Industries & Machinery Ltd.
    Inventors: Dong Sub Sim, Kyung Woon Kim, Keun Chul Song, Jung Hwan Cho
  • Method of producing hardmetal-bonded metal component
    Publication number: 20030116227
    Abstract: A method is provided of producing a hardmetal-bonded metal component with an enhanced bond strength. The method comprises the steps of providing an iron-based metal body, mixing and compressing raw material powder of hardmetal and binder powder containing nickel, silicon and boron into a preform, heating and sintering the preform, and applying heat to the sintered body and the iron-based metal body under a state that the sintered body is brought into contact with the iron-based metal body, to thereby cause the sintered body to be bonded to the iron-based metal body. The sintered body and the iron-based metal body are thermally treated at a temperature of 1,000 to 1,200° C. for 30 or more minutes so that boron present in the sintered body is infiltrated into grain boundaries of the iron-based metal body to form a plurality of boride spikes in a bonding interface.
    Type: Application
    Filed: December 18, 2002
    Publication date: June 26, 2003
    Applicant: Daewoo Heavy Industries & Machinery Ltd.
    Inventors: Dong Sub Sim, Kyung Woon Kim, Keun Chul Song, Jung Hwan Cho