Graham A Whitlow

US Patent:

57019932, Dec 30, 1997

Filed:

Jun 10, 1994

Appl. No.:

8/257990

Inventors:

Graham A. Whitlow - Murrysville PA
Mehmet N. Gungor - Pittsburgh PA
William R. Lovic - New Kensington PA

Assignee:

Eaton Corporation - Cleveland OH

International Classification:

H01H 102

US Classification:

200264

Abstract:

A 100% dense, porosity free copper-chromium contact has been prepared in which deleterious porosity has been eliminated. This copper-chromium contact has been produced by pressurizing liquid copper to infiltrate an evacuated chromium based, lightly sintered, highly porous preform. The electrical contact has one of either a homogeneous Cr distribution and a graded Cr distribution. The apparatus used to effect the molten metal infiltration has two independent, physically separated chambers--a first cold chamber and a second hot chamber. The first chamber is under no applied pressure except inside a gating system used to transfer molten Cu into the porous preform in the first chamber. The new contact has about 15-30% Cr material and a high erosion resistant contact surface. The graded Cr distribution has a Cr rich layer with about 25-50% by weight Cr, an intermediate Cr layer with about 15-20% by weight Cr, a low Cr layer with about 5-15% Cr and a Cr poor layer with about 1-5% Cr above a copper substrate.

US Patent:

47376120, Apr 12, 1988

Filed:

Feb 2, 1987

Appl. No.:

7/010762

Inventors:

Gerald J. Bruck - Library PA
James E. Smith - Delmont Boro PA
Paul E. Denney - Pittsburgh PA
Ronald D. O'Brokta - Allegheny Township, Westmoreland County PA
Graham A. Whitlow - Murrysville PA

Assignee:

Westinghouse Electric Corp. - Pittsburgh PA

International Classification:

B23K 2600

US Classification:

219121LD

Abstract:

Virgin metal and metal alloy components are welded with and without filler material using a laser without cleaning the surfaces to be joined of mill scale and/or surface oxides, paints grease and other forms of contamination, and without edge preparation. The uncleaned, unprepared surfaces are placed in contact with each other, and a 100% through the thickness laser keyhole weld without filler metal is made in one pass, full penetration is achieved by two laser keyhole welds without filler metal (one made from each side), or resistively heated filler wire is fed into the metal pool of a laser conduction weld in one or more passes along each side of the confronting surfaces to be joined. Quality welds are made despite gaps of varying size up to about 0. 125 inches between the parts to be joined.

US Patent:

50752863, Dec 24, 1991

Filed:

Apr 17, 1989

Appl. No.:

7/339338

Inventors:

John C. Powell - Pittsburgh PA
Graham A. Whitlow - Murrysville PA

Assignee:

Westinghouse Electric Corp. - Pittsburgh PA

International Classification:

H01L 3924

US Classification:

505 1

Abstract:

A method of making a composite having superconducting capability is characterized by the steps: (1) forming a mixture of particulate yttrium or rare earth, that is alloyable with Ba and Cu, with particulate Ba, Cu, and Ag, where Ag additive is present in an amount of from 2 weight % to 30 weight % of the mixture, where the Ag additive has a particle size from 0. 01 micrometer to 5 micrometers, (2) melting the mixture, (3) forming on a support surface a 10% to 30% porous ribbon of alloy having an interior Ag network, (4) removing the ribbon, (5) placing the ribbon alloy on top of a metal sheet, (6) placing a metal sheet on top of the ribbon alloy, (7) sealing the ribbon alloy within the metal sheets to form a composite, (8) uni-directional rolling the composite to reduce its cross-section, and (9) annealing the composite at from 100. degree. C. to 900. degree. C. in the presence of a source of oxygen, to provide a ceramic ribbon having contacting Ag additive particles effective to carry electrical current from the ceramic ribbon to the metal sheets at temperatures greater than 100. degree. K.

US Patent:

53300882, Jul 19, 1994

Filed:

Apr 30, 1993

Appl. No.:

8/054171

Inventors:

Graham A. Whitlow - Murrysville PA
Carl B. Freidhoff - Murrysville PA
Philip E. Carpentier - Elmira NY
Paul O. Wayland - Montour Falls NY

Assignee:

Eaton Corporation - Cleveland OH

International Classification:

H01H 102
B23K 3102

US Classification:

2291791

Abstract:

A layer selected from a group comprising: molybdenum, tantalum, tungsten, osmium, rhenium, ruthenium and an alloy of two or more thereof on the under surface of an electrical contact acts as a barrier to copper diffusion from the braze material into the contact structure. A thin nickel layer on the barrier facilitates the brazing of the barrier coated contact surface to the copper electrodes.

US Patent:

49613901, Oct 9, 1990

Filed:

Feb 7, 1990

Appl. No.:

7/476215

Inventors:

Graham A. Whitlow - Murrysville PA
Suh Y. Lee - Monroeville PA

Assignee:

Westinghouse Electric Corp. - Pittsburgh PA

International Classification:

A47J 3624
F27B 736

US Classification:

110246

Abstract:

Perforated plugs fitted into combustion air holes in a rotary combustor in which combustion air for burning municipal solid waste passes through the perforations to prevent molten aluminum and fines from passing through the perforations and the method of preventing molten aluminum from passing through the perforations using the plugs.

US Patent:

55169953, May 14, 1996

Filed:

Mar 30, 1994

Appl. No.:

8/220129

Inventors:

Graham A. Whitlow - Murrysville PA
William R. Lovic - New Kensington PA
Paul G. Slade - Pittsburgh PA

Assignee:

Eaton Corporation - Cleveland OH

International Classification:

H01H 102

US Classification:

200266

Abstract:

A new class of low chop contact materials based on Ag-chromium carbide and Ag-Cr compositions have an essentially 100% dense, porosity free microstructure. These materials combine the advantageous properties of Ag-WC and Cu-Cr contacts without their disadvantages. A method of making this new class of low chop contact materials includes the steps of cold pressing a mixture of Ag and chromium or chromium carbide to form an unsintered blank and the elevated temperature infiltration of silver into the unsintered blank to obtain an essentially 100% dense, porosity free microstructure.

US Patent:

49279920, May 22, 1990

Filed:

Mar 4, 1987

Appl. No.:

7/021856

Inventors:

Graham A. Whitlow - Murrysville PA
Gerald J. Bruck - Library PA
James E. Smith - Delmont Boro PA

Assignee:

Westinghouse Electric Corp. - Pittsburgh PA

International Classification:

B23K 2600

US Classification:

21912165

Abstract:

Near net shape metal articles are cast from powder feedstock using a focused high energy beam which melts successive layers of powder as it repetitively traces the shape of the article over a substrate without the necessity for refocusing. Powder is fed into a cavity in which the article is formed at a rate to maintain a depth which provides lateral support for, and therefore forms a mold for, a thick layer of powder which is melted by the energy beam to add each layer to the article. The high energy laser or electron beam has a power density sufficient to penetrate the melted layer of powder and melt the surface of the underlying substrate or layer just enough to provide a good metallurgical bond for the layer being added. A copper fixture which supports the substrate while the article is being formed, serves as a heat sink and forms the cavity which confines the powder to the vicinity of the article being formed. Various shapes can be cast through selected programming of the repetitive pattern of relative motion between the energy beam and the substrate.

US Patent:

H9709, Oct 1, 1991

Filed:

Jun 8, 1989

Appl. No.:

7/363019

Inventors:

Thomas S. Snyder - Oakmont PA
Graham A. Whitlow - Murrysville PA

Assignee:

The United States of America as represented by the United States
Department of Energy - Washington DC

International Classification:

C25C 100
C25C 106
C25C 112

US Classification:

204105R

Abstract:

An integrated process for decontamination of metals, particularly metals that are used in the nuclear energy industry contaminated with radioactive material. The process combines the processes of electrorefining and melt refining to purify metals that can be decontaminated using either electrorefining or melt refining processes.