Patents Assigned to Ytbolaget I Uppsala Aktiebolag
  • Prosthetic articles made of surface conversion nitrided titanium or titanium alloys
    Patent number: 5427631
    Abstract: Objects of titanium or titanium alloys having the surface converted to a hard and wear-resistant nitride layer with good adhesion, which is distributed uniformly and also provides internal capillaries. The objects are produced by being treated in a vacuum furnace with an atmosphere of pure nitrogen gas at a temperature of 650.degree.-1000.degree. C. and at a pressure below atmospheric pressure. The thickness of the nitride layer can be controlled by controlling the treatment time and temperature.
    Type: Grant
    Filed: March 30, 1994
    Date of Patent: June 27, 1995
    Assignee: Ytbolaget I Uppsala Aktiebolag
    Inventors: Erik Johansson, Helena Westberg