Patents Assigned to Jupiter Technologies, Inc.
  • Composites comprising silicon carbide fibers dispersed in magnesia-aluminate matrix and fabrication thereof and of other composites by sinter forging
    Patent number: 4871496
    Abstract: A novel ceramic-ceramic composite of a uniform dispersion of silicon carbide fibers in a matrix of MgO.multidot.nAl.sub.2 O.sub.3 wherein n ranges from about 1 to about 4.5, said composite comprising by volume from 1 to 50% silicon carbide fibers and from 99 to 50% MgO.multidot.nAl.sub.2 O.sub.3. The composite is readily fabricated by forming a powder comprising a uniform dispersion of silicon carbide fibers in poorly crystalline phase comprising MgO and Al.sub.2 O.sub.3 in a mole ratio of n and either (a) hot pressing or preferably (b) cold pressing to form a preform and then forging utilizing a temperature in the range of 1100.degree. C. to 1900.degree. C. and a strain rate ranging from about 10.sup.-5 seconds .sup.-1 to about 1 seconds .sup.-1 so that surfaces cracks do not appear to obtain a shear deformation greater than 30%.
    Type: Grant
    Filed: August 11, 1988
    Date of Patent: October 3, 1989
    Assignees: Jupiter Technologies, Inc., Cornell Research Foundation, Inc.
    Inventors: Prakash C. Panda, Edgar R. Seydel, Rishi Raj
  • Superplastic forging of zirconia ceramics
    Patent number: 4849142
    Abstract: The invention relates to producing relatively flaw free zirconia ceramic shapes requiring little or no matching by superplastic forging of a fully sintered or partially sintered preform. The preform is prepared by providing a starting powder comprising by weight from about 70% to about 100% zirconia and from about 0 to about 30% of stabilizing additives, e.g. commerically available TZ-3Y powder, cold pressing to obtain a preform of green density ranging from about 30% of theoretical density to about 75% of theoretical density and partially or fully sintering at atmospheric pressure, e.g. in argon or air at a temperature ranging from about 900.degree. C. to about 1900.degree. C. The superplastic forging is carried out by isothermally pressing the partially or fully sintered preform into substantially final shape utilizing a temperature and strain rate such that surface cracks do not occur, e.g. utilizing a temperature of 1310.degree. C.
    Type: Grant
    Filed: January 3, 1986
    Date of Patent: July 18, 1989
    Assignees: Jupiter Technologies, Inc., Cornell Research
    Inventors: Prakash C. Panda, Edgar R. Seydel, Rishi Raj
  • Superplastic forging nitride ceramics
    Patent number: 4732719
    Abstract: The invention relates to producing relatively flaw free silicon nitride ceramic shapes requiring little or no machining by superplastic forgingThis invention herein was made in part under Department of Energy Grant DE-AC01-84ER80167, creating certain rights in the United States Government. The invention was also made in part under New York State Science and Technology Grant SB1R 1985-10.
    Type: Grant
    Filed: January 3, 1986
    Date of Patent: March 22, 1988
    Assignee: Jupiter Technologies, Inc.
    Inventors: Prakash C. Panda, Edgar R. Seydel, Rishi Raj