Patents Assigned to Hoeganaes Corp.
  • Patent number: 5767426
    Abstract: This invention presents, inter alia, novel iron-based powder compositions and compacted articles made from the same. The novel iron-based powder compositions of the invention are formulated with a fluoric resin, such as polytetrafluoroethylene, which provides powder mixtures with good flow properties and good uniformity. Compacted articles made from the novel iron-based powder compositions of the invention show reduced core losses and have good magnetic permeability over an extended frequency range. These compacted articles also exhibit high green density and good ejection characteristics.
    Type: Grant
    Filed: March 14, 1997
    Date of Patent: June 16, 1998
    Assignee: Hoeganaes Corp.
    Inventors: Christopher G. Oliver, Sydney Luk
  • Patent number: 5518639
    Abstract: The present invention provides lubricant compositions for the powder metallurgical field. The lubricant compositions contain a solid phase lubricant such as graphite, molybdenum disulfide, and polytetrafluoroethylene in combination with a liquid phase lubricant that is a binder for the solid phase lubricant. The binder can be chosen from various classes of compounds including polyethylene glycols, polyethylene glycol esters, partial esters of C.sub.3-6 polyhydric alcohols, polyvinyl esters, and polyvinyl pyrrolidones. The binder is solubilized in an organic solvent.
    Type: Grant
    Filed: August 12, 1994
    Date of Patent: May 21, 1996
    Assignee: Hoeganaes Corp.
    Inventors: Sydney Luk, Ann Lawrence