Patents Assigned to Risi Industries, Inc.
  • Patent number: 4765950
    Abstract: Provided is a method of manufacturing sintered parts from particulate material, e.g metal or ceramic parts. The method comprises mixing together predetermined amounts of powdered particulate material and a binder, which mixture is then molded under heat and pressure. The binder comprises at least a lower melting point component and a higher melting point component, with the lower melting point component remaining in a liquid state, becoming semi-solid or relatively soft upon cooling to ambient temperatures. Prior to sintering, the lower melting point component of the binder is selectively dissolved in a liquid solvent, and the higher melting point component is removed upon heating at temperatures below the sintering temperature. The result is a process which eliminates or prevents the formation of oxides, substantially reduces the time required for debinding and sintering, and essentially eliminates cracking in the finished part.
    Type: Grant
    Filed: October 7, 1987
    Date of Patent: August 23, 1988
    Assignee: Risi Industries, Inc.
    Inventor: Kenneth P. Johnson