Mo Or W Containing Patents (Class 428/569)
  • Impregnated sintered material for electrical contacts and method for its production
    Patent number: 4153755
    Abstract: An impregnated sintered material for making electrical contact members which have a low fusing force and little burning in which a powder mixture of W, Ag and/or Cu, a wetting promoting metal, and 2 to 5 percent by weight graphite is granulated thermically, and another 1 to 6 percent by weight graphite admixed to the granules, after which the mixture is compacted to form a skeleton and impregnated with Ag and/or Cu. The carbon contained in the finished material is partly in bound form as WC and partly free carbon in a 1:5 to 5:1 ratio.
    Type: Grant
    Filed: February 23, 1978
    Date of Patent: May 8, 1979
    Assignee: Siemens Aktiengesellschaft
    Inventors: Bernhard Rothkegel, Horst Schreiner
  • Method of producing ferrous sintered alloy of improved wear resistance
    Patent number: 4123265
    Abstract: A method of producing a ferrous alloy material having improved wear resistance comprising (1) mixing powders of a ferrous alloy, tungsten and optionally at least one element selected from the group consisting of C, Ni, Mn, Mo, Cr, and Cu, (2) sintering the mixture of powders of step (1) to form a sintered product, (3) infiltrating the sintered product of step (2) with molten copper or a copper alloy to produce an infiltrated sintered product and (4) cooling the infiltrated sintered product of step (3).
    Type: Grant
    Filed: February 23, 1977
    Date of Patent: October 31, 1978
    Assignee: Nippon Piston Ring Co., Ltd.
    Inventors: Kentaro Takahashi, Shigeru Urano