Patents Assigned to Tisurf International AB
  • Method of producing integral, hard nitride layer on titanium/titanium alloy
    Patent number: 5320686
    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 21, 1991
    Date of Patent: June 14, 1994
    Assignee: Tisurf International AB
    Inventors: Erik Johansson, Helena Westberg