Abstract: Fibrous material is coated with boron nitride and a silicon-wettable material, the coated fibrous material is admixed with an infiltration-promoting material which is at least partly elemental carbon and the mixture is formed into a preform which is infiltrated with molten silicon producing a composite containing boron nitride coated fibrous material.
Type:
Grant
Filed:
June 1, 1987
Date of Patent:
May 14, 1991
Assignee:
General Electric Company
Inventors:
Marcus P. Borom, William B. Hillig, Raj N. Singh, William A. Morrison, Leonard V. Interrante
Abstract: A transfer tube is produced comprised of a high density ceramic oxide tube having directly bonded to its outer surface wall a low density ceramic oxide shell.
Type:
Grant
Filed:
April 17, 1989
Date of Patent:
April 30, 1991
Assignee:
General Electric Company
Inventors:
Marcus P. Borom, Lawrence E. Szala, Milivoj Brun, Steven A. Miller, David P. Mourer
Abstract: A composite comprised of a sintered matrix of spinel ferrite and a non-exposed continuous phase of elemental silver or Ag-Pd alloy ranging to 25 atomic % Pd is produced by co-firing a laminated structure of ferrite powder-containing tapes containing non-exposed metallization-forming material. The composite can be formed into a composite product which contains a continuous silver or Ag-Pd alloy phase with two end portions wherein only the end portions are exposed.
Type:
Grant
Filed:
May 23, 1988
Date of Patent:
March 19, 1991
Assignee:
General Electric Company
Inventors:
Richard J. Charles, Achuta R. Gaddipati
Abstract: A composite comprised of a sintered matrix of spinel ferrite and a non-exposed continuous phase of elemental silver or Ag-Pd alloy ranging to 25 atomic % Pd is produced by co-firing a laminated structure of ferrite powder-containing tapes containing non-exposed metallization-forming material. The composite can be formed into a composite product which contains a continuous silver or Ag-Pd alloy phase with two end portions wherein only the end portions are exposed.
Type:
Grant
Filed:
May 7, 1990
Date of Patent:
March 19, 1991
Assignee:
General Electric Company
Inventors:
Richard J. Charles, Achuta R. Gaddipati
Abstract: A polycrystalline Y-Ba-Cu-O superconductor doped with sufficient .sup.235 U and/or .sup.239 Pu atoms is irradiated with thermal neutrons to produce from about 2.5.times.10.sup.14 to about 50.times.10.sup.14 fission events per cubic centimeter of superconductor.
Abstract: An integral transfer tube is produced comprised of a hollow high density ceramic oxide tube having its outer surface wall surrounded by a low density ceramic oxide shell, and having a heating element comprised of a heating wound portion and two end portions wherein the wound portion is intermediate the tube and the shell, and wherein at least a sufficient amount of the end portions are exposed for electrical attachment.
Type:
Grant
Filed:
April 23, 1990
Date of Patent:
February 19, 1991
Assignee:
General Electric Company
Inventors:
Milivoj K. Brun, Marcus P. Borom, Steven A. Miller, Lawrence E. Szala, Paul S. Svec
Abstract: A superconductive polycrystalline body is produced having a composition selected from the group consisting of Y.sub.1-x (Ln).sub.x Ba.sub.2 Cu.sub.3 O.sub.7-7, La.sub.1-x (Ln).sub.x Ba.sub.2 Cu.sub.3 O.sub.7-y and a combination thereof wherein x ranges from about 0.01 to about 0.5, y ranges up to about 0.3, and where Ln is selected from the group consisting of Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb and a combination thereof.
Abstract: A composite is produced by depositing a slurry of infiltration-promoting material and organic binding material on a layer of boron nitride coated fibrous material forming a tape therewith on drying, firing the tape to burn out organic binding material and infiltrating the resulting porous body with a solution of boron and silicon.
Abstract: An integral transfer tube is produced comprised of a hollow high density ceramic oxide tube having its outer surface wall surrounded by a low density multilayered ceramic oxide shell, and having a heating element comprised of a heating wound portion and two end portions wherein the wound portion is intermediate the tube and the shell, and wherein at least a sufficient amount of the end portions are exposed for electrical attachment.
Type:
Grant
Filed:
October 27, 1989
Date of Patent:
December 18, 1990
Assignee:
General Electric Company
Inventors:
Milivoj K. Brun, Marcus P. Borom, Steven A. Miller, Lawrence E. Szala, Paul S. Svec
Abstract: A transfer tube is produced comprised of a high density ceramic oxide tube having a low density multi-layered ceramic oxide shell directly bonded to its outer surface wall.
Type:
Grant
Filed:
June 16, 1989
Date of Patent:
October 30, 1990
Assignee:
General Electric Company
Inventors:
Paul S. Svec, Marcus P. Borom, Lawrence E. Szala, Milivoj K. Brun, Steven A. Miller, David P. Mourer
Abstract: A composite comprises of a sintered matrix of spinel ferrite and an electrically conductive phase of elemental silver is produced by co-firing a laminated structure of ferrite powder-containing tapes containing a silver metallization-forming material having two end portions wherein only the end portions are exposed.
Type:
Grant
Filed:
June 5, 1989
Date of Patent:
October 30, 1990
Assignee:
General Electric Company
Inventors:
Richard J. Charles, Achuta R. Gaddipati
Abstract: A composite is produced comprised of Y--Ba--Cu--O superconductive film having a zero resistance transition temperature of at least about 38 K, a zirconium dioxide film and a substrate wherein the zirconium dioxide film is intermediate the superconductive film and the substrate.
Abstract: An integral transfer tube is produced comprised of a hollow high density ceramic oxide tube having its outer surface wall surrounded by a low density ceramic oxide shell, and having a heating element comprised of a heating wound portion and two end portions wherein the wound portion is intermediate the tube and the shell, and wherein at least a sufficient amount of the end portions are exposed for electrical attachment.
Type:
Grant
Filed:
July 10, 1989
Date of Patent:
August 7, 1990
Assignee:
General Electric Company
Inventors:
Milivoj K. Brun, Marcus P. Borom, Steven A. Miller, Lawrence E. Szala, Paul S. Svec
Abstract: Fibrous material is coated with boron nitride and a silicon-wettable material, the coated fibrous material is admixed with an infiltration-promoting material which is at least partly elemental carbon and the mixture is formed into a preform which is infiltrated with a molten solution of boron and silicon producing a composite containing boron nitride coated fibrous material.
Abstract: A composite is produced comprised of ceramic oxide fibrous material which is coated with a noble metal and disposed in a ceramic oxide matrix. The composite can be produced by contacting the coated fibrous material with matrix-forming oxide powder to form a compact and densifying the compact. Densification can be carried out by techniques such as sintering, isostatic pressing, and hot pressing. The composite can also be produced by forming the coated fibrous material into a preform having an open porosity and infiltrating the preform with a vapor of the matrix-forming material.
Abstract: A composite is produced by admixing a matrix-forming material with organic binding material, forming the resulting mixture into a tape, disposing a layer of spaced boron nitride coated filaments between at least two of the tapes to form a layered structure, laminating the layered structure, heating the layered structure to remove organic binding material and hot pressing the resulting porous structure to form a composite containing spaced boron nitride coated filaments.
Abstract: A composite is produced comprised of ceramic oxide fibrous material which is coated with a noble metal and disposed in a polycrystalline ceramic oxide matrix.
Abstract: A fiber- and filament-containing ceramic preform comprised of a mixture of discontinuous fibers and particulates surrounding a layer of continuous filaments extending substantially through the mixture is produced and infiltrated with a molten ceramic to produce a composite.
Abstract: A composite is produced by depositing an organic slurry of ceramic matrix-forming material on a layer of boron nitride coated fibrous material forming a tape therewith on drying, forming a layered structure of the tapes, laminating the structure, firing the laminated structure to burn out organic material and hot pressing the resulting porous structure to form a composite.