Patents Assigned to Cemm Co., Ltd.
  • Method for nitriding-processing iron group series alloy substrate
    Patent number: 6602353
    Abstract: A processing method for nitriding an iron group series alloy substrate, or processing subject, containing an alloy element for forming nitride by plasma nitriding treatment including a passivated membrane removing treatment step. The passivated membrane removing treatment is performed by hydrogen sputtering under reduced pressure. It is desirable that this hydrogen sputtering is initiated from a normal temperature in a process of raising a temperature of a processing subject for plasma nitriding.
    Type: Grant
    Filed: June 19, 2001
    Date of Patent: August 5, 2003
    Assignee: Cemm Co., Ltd.
    Inventors: Shigeaki Kanbe, Hironori Hukuta, Kousuke Katou