Patents Represented by Attorney Paul E. Rochford

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  • Method of fabricating titanium alloys in foil form
    Patent number: 4838337
    Abstract: A method for forming a titanium metal foil is provided. The titanium metal may be essentially any titanium alloy. The alloy is first provided in powder form. The powder is sprayed through a low pressure RF plasma deposition apparatus onto a preformed foil mounted onto a rotating drum. The preformed foil is removed from the drum after plasma deposit of the layer of titanium alloy and the preformed foil is removed from the plasma deposit foil to leave a free standing foil of the titanium alloy.
    Type: Grant
    Filed: February 4, 1987
    Date of Patent: June 13, 1989
    Assignee: General Electric Company
    Inventor: Paul A. Siemers
  • Silicon-modified titanium aluminum alloys and method of preparation
    Patent number: 4836983
    Abstract: A TiAl composition is prepared to have high strength and to have improved ductility by altering the atomic ratio of the titanium and aluminum to have what has been found to be a highly desirable effective aluminum concentration by addition of silicon according to the approximate formula Ti.sub.54-57 Al.sub.39-41 Si.sub.4-5.
    Type: Grant
    Filed: December 28, 1987
    Date of Patent: June 6, 1989
    Assignee: General Electric Company
    Inventors: Shyh-Chin Huang, Michael F. X. Gigliotti, Jr.
  • Method of forming fatigue crack resistant nickel base superalloys and product formed
    Patent number: 4820353
    Abstract: A novel nickel base superalloy is provided. The alloy is unique in having a high enough concentration of .gamma.' strengthening precipitate to provide a valuable set of physical properties and yet retain forgeability properties similar to those of alloys having lower concentration of precipitate.
    Type: Grant
    Filed: September 15, 1986
    Date of Patent: April 11, 1989
    Assignee: General Electric Company
    Inventor: Keh-Minn Chang
  • Method of making high strength superalloy components with graded properties
    Patent number: 4820358
    Abstract: A novel heat treatment of a disk for a jet engine is provided. A temperature gradient is established on the disk to heat the inner portions to a temperature at which a subsolvus anneal takes place and to heat the outer portions to a temperature where a supersolvus anneal takes place. A reverse gradient is established from the inner portions of the disk during cooling after the anneal to cool the inner portions of the disk more rapidly than the outer portions so as to impart high tensile and fatigue strength to the inner portions and high temperature rupture life and crack growth resistance to the outer portions. A novel disk results.
    Type: Grant
    Filed: April 1, 1987
    Date of Patent: April 11, 1989
    Assignee: General Electric Company
    Inventor: Keh-Minn Chang
  • Method of forming fatigue crack resistant nickel base superalloys
    Patent number: 4816084
    Abstract: A method is provided for reducing fatigue crack propagation in nickel base superalloys. The method involves a supersolvus anneal in which essentially all .gamma.' precipitate phase is dissolved. The supersolvus anneal is folloed by slow cooling which is at a rate which substantially reduces time dependent fatigue crack growth but which preserves the strength of the alloy at a useful level for many superalloy applications.
    Type: Grant
    Filed: September 15, 1986
    Date of Patent: March 28, 1989
    Assignee: General Electric Company
    Inventor: Keh-Minn Chang
  • High strength superalloy for high temperature applications
    Patent number: 4814023
    Abstract: A novel alloy is provided having approximately the following ingredient formula:______________________________________ Element Composition in weight % ______________________________________ Ni balance Cr 10.0 Co 15.0 Mo 5.0 W 5.0 Al 3.5 Ti 3.0 Ta 7.2 Zr 0.03 B 0.03 C 0.03. ______________________________________The alloy has a solvus temperature of below 1200.degree. C. Fatigue crack propagation rate is low for metal samples cooled at rates of 50.degree. C./min to 200.degree. C./min. The alloy has uniquely high strength at temperatures at and above 1200.degree. F.
    Type: Grant
    Filed: May 21, 1987
    Date of Patent: March 21, 1989
    Assignee: General Electric Company
    Inventor: Keh-Minn Chang
  • Method for finishing the surface of plasma sprayed TI-alloy foils
    Patent number: 4805294
    Abstract: An improved method of forming titanium alloy in sheet form is taught. The sheet is formed by plasma spraying larger particles of greater than 100 .mu.m diameter onto a receiving surface to form a sheet having a rough surface due to the larger particles. An RF powered gun is employed to form the deposit using the larger particles. The formed sheet is separated from the substrate and rolled to reduce the sheet thickness as well as to render the rough surface smoother and more even.
    Type: Grant
    Filed: February 4, 1987
    Date of Patent: February 21, 1989
    Assignee: General Electric Company
    Inventor: Paul A. Siemers
  • Method of forming compacts with integral consolidation containers
    Patent number: 4805833
    Abstract: A method for forming fiber reinforced titanium alloy composite is taught. The composite is formed with an inner and outer high density skin of titanium base alloy prepared by RF plasma spray depositing larger size particles of the alloy. The first skin is formed on a substrate, the fiber reinforcement is applied over the inner portion of the first skin and then a second skin is RF plasma deposited over the reinforcement and outer or edge portions of the first skin to seal the contents of the composite. The composite is then hot isostatic pressed to densify its contents without being enclosed in any auxilliary container such as the conventional HIPing container.
    Type: Grant
    Filed: February 25, 1987
    Date of Patent: February 21, 1989
    Assignee: General Electric Company
    Inventor: Paul A. Seimers
  • Method for melt atomization with reduced flow gas
    Patent number: 4801412
    Abstract: A method of atomization of metals which melt at high temperatures is provided. The atomization is carried out in an atomization zone at the lower end of a melt delivery tube. Melt is delivered to the zone through the tube. Atomizing gas is delivered to the melt emerging from the lower end of the melt delivery tube by impinging the gas inwardly against the outer tapered end of the melt delivery tube. The tube's outer surface is formed with a concavity so that the incident atomizing gas is deflected into contact with the emerging melt stream.
    Type: Grant
    Filed: June 20, 1986
    Date of Patent: January 31, 1989
    Assignee: General Electric Company
    Inventor: Steven A. Miller
  • Thermomechanical method of forming fatigue crack resistant nickel base superalloys and product formed
    Patent number: 4793868
    Abstract: A method has been discovered for reducing fatigue crack growth in nickel base superalloys. The method involves the step of forming a part to near net shape by forging or by other forming technique. The part is then heat treated to develop regular grains by recystallization. Grains of about 35 .mu.m average diameters are prepared. The part is then deformed at least 15% to achieve a net shape desired.
    Type: Grant
    Filed: September 15, 1986
    Date of Patent: December 27, 1988
    Assignee: General Electric Company
    Inventor: Keh-Minn Chang
  • Tri-titanium aluminide base alloys of improved strength and ductility
    Patent number: 4788035
    Abstract: A titanium aluminide base composition is provided which has increased tensile strength, ductility and rupture life due to the addition of tantalum coupled with optional additions of vanadium and columbium.
    Type: Grant
    Filed: June 1, 1987
    Date of Patent: November 29, 1988
    Assignee: General Electric Company
    Inventors: Michael F. X. Gigliotti, Jr., Brian J. Marquardt
  • Silicon-carbide reinforced composites of titanium aluminide
    Patent number: 4786566
    Abstract: A method of forming a composite of fibers having high strength at high temperatures in a high temperature metal matrix is taught. The high strength fibers may be silicon carbide fibers. The fibers are aligned and disposed on a substrate surface. A metal to serve as a matrix is provided in powder form with relatively larger particles of the order of more than 100 .mu.m. The powder is plasma spray deposited on the fiber coated substrate surface to cause the metal to at least partially envelop the fibers. The composite is then separated from the substrate.
    Type: Grant
    Filed: February 4, 1987
    Date of Patent: November 22, 1988
    Assignee: General Electric Company
    Inventor: Paul A. Siemers
  • Method for continuous fabrication of fiber reinforced titanium-based composites
    Patent number: 4782884
    Abstract: A number of individual silicon carbide filaments are assembled to form a tape. The tape is passed across a drum in a low pressure plasma deposition apparatus where the surface of the drum is formed of a polished and cooled refractory metal. The tape is sprayed with a plasma spray of the titanium base alloy metal to form a sheet of such metal on the tape and on the surface of the drum. The deposited sheet including the silicon carbide reinforcement tape is removed from the drum surface by peeling. The peeled product is a composite of titanium base sheet metal which is impregnated with the filaments of silicon carbide, i.e. a metal impregnated tape.
    Type: Grant
    Filed: February 4, 1987
    Date of Patent: November 8, 1988
    Assignee: General Electric Company
    Inventor: Paul A. Siemers
  • Composite rotary anode for x-ray tube and process for preparing the composite
    Patent number: 4777643
    Abstract: A method for the diffusion bonding of a graphite member to a metallic surface as part of a composite rotary anode for an X-ray tube is set forth. In the completed structure a carbide-free compound laminate separating and metallurgically bonded to the graphite member and to the metallic surface consists of, in sequence, a layer of interdiffused metals comprising a first metal selected from the group consisting of molybdenum and tungsten and a second metal selected from the group consisting of tantalum, columbium and alloys thereof, a layer consisting essentially of the second metal, a zone of interdiffused metals comprising platinum and the second metal and then a continuous layer comprising platinum or platinum alloy.
    Type: Grant
    Filed: February 15, 1985
    Date of Patent: October 11, 1988
    Assignee: General Electric Company
    Inventor: Thomas M. Devine, Jr.
  • RF plasma method of forming multilayer reinforced composites
    Patent number: 4775547
    Abstract: The preparation of multilayer filament reinforced consolidated articles is found to be possible because of the unique properties of RF plasma sprayed deposits. Pursuant to this method, a first layer of plasma deposited foil is made with a rough upper surface. A layer of closely spaced aligned reinforcing filaments is positioned on the rough surface. A second foil of RF plasma deposited metal is formed in and on the layer of filaments. A second layer of filaments is positioned on the second foil and a third foil is formed in and on the second layer. The three foils are integrated because of the strong tendency of the RF plasma sprayed metal to penetrate through, wet the fibers, and bond to the layer underneath.
    Type: Grant
    Filed: February 25, 1987
    Date of Patent: October 4, 1988
    Assignee: General Electric Company
    Inventor: Paul A. Siemers
  • Ni.sub.3 A1 alloy of improved ductility based on iron and niobium substituent
    Patent number: 4764226
    Abstract: A melt is provided having the formula(Ni.sub.0.76 Al.sub.0.24-x Nb.sub.x).sub.89.75 Fe.sub.10 B.sub.0.25.The melt is rapidly solidified as ribbon and the ribbon is annealed at about 1100.degree. C. Desirable properties are found when x is between 0.02 and 0.10.
    Type: Grant
    Filed: October 3, 1985
    Date of Patent: August 16, 1988
    Assignee: General Electric Company
    Inventors: Shyh-Chin Huang, Keh-Minn Chang, Alan I. Taub
  • Method for fabrication of low cost finely divided silicon-germanium and consolidated compacts thereof
    Patent number: 4759905
    Abstract: Apparatus is provided for the production of ultrafine powder. The powder is produced by spark erosion within an electric discharge cell. The starting material for production of the powder is a body in chunk form of the material to be pulverized. The material is contained in an electric discharge cell having a fine mesh screen bottom. The cell and its contents are immersed in a dielectric fluid such as water, liquified gas or an organic base liquid. The cell and its contents are vibrated to cause the chunks to separate repeatedly and momentarily. A sparking voltage is impressed repeatedly through the body to develop sparks between confronting portions of separated chunk surfaces. Small particles produced as a result of the sparking fall through the screen of the cell and are collected as product.
    Type: Grant
    Filed: April 3, 1987
    Date of Patent: July 26, 1988
    Assignee: General Electric Company
    Inventors: John L. Walter, Ami E. Berkowitz
  • Ni.sub.3 Al alloy of improved ductility based on iron substituent
    Patent number: 4743315
    Abstract: A melt is provided having the formula(Ni.sub.1-x Al.sub.x).sub.99-y Fe.sub.y B.sub.1The melt is rapidly solidified as ribbon and the ribbon is annealed at about 100.degree. C. Desirable properties are found when x is between 0.21 and 0.26 and y is between 5 and 15.
    Type: Grant
    Filed: August 29, 1986
    Date of Patent: May 10, 1988
    Assignee: General Electric Company
    Inventors: Shyh-Chin Huang, Keh-Minn Chang, Alan I. Taub
  • Rapidly solidified zirconium modified nickel aluminide of improved strength
    Patent number: 4743316
    Abstract: It had been found previously that tri-nickel aluminide compositions are quite sensitive to the ratio of nickel to aluminum in their ability to receive boron as a dopant. It has now been found that compositions which are relatively poor in the aluminum component can be doped more effectively with a combination of boron and zirconium. It has been found for the nickel aluminides which have lower concentrations of aluminum that the percent of zirconium and boron which can be added to the composition to effectively increase the strength of the alloys is favored by the lower aluminum ratio. The compositions which result are found to have significant strength properties not only at room temperature but at elevated temperatures based on tensile tests of the compositions.
    Type: Grant
    Filed: October 3, 1985
    Date of Patent: May 10, 1988
    Assignee: General Electric Company
    Inventors: Alan I. Taub, Keh-Minn Chang, Shyh-Chin Huang
  • Alternating segment ring structure
    Patent number: 4726962
    Abstract: A ring is formed having alternating segments of ferromagnetic and paramagnetic materials. The ring is formed by first providing an annular ring of a high strength magnetic steel. Teeth are formed on the outer surface of the ring by forming troughs of the ferromagnetic material. Low pressure plasma deposition is used to fill in the troughs with a high strength paramagnetic material. The excess steel and excess plasma deposited material is removed to leave the finished ring of alternating segments of ferromagnetic and paramagnetic material.
    Type: Grant
    Filed: April 10, 1986
    Date of Patent: February 23, 1988
    Assignee: General Electric Company
    Inventors: Paul A. Siemers, Robert W. Kopp, Melvin R. Jackson