Paul D Gigl

US Patent:

20050211702, Sep 29, 2005

Filed:

Mar 29, 2004

Appl. No.:

10/811623

Inventors:

Paul Gigl - Centre Hall PA, US
Mark Hunt - Tomball TX, US

International Classification:

H05B006/78

US Classification:

219700000

Abstract:

Incidents of fracturing of crucibles during microwave sintering are reduced through the use of low thermal shock resistance crucibles comprised predominately of an alloy of silicon nitride and aluminum oxide.

US Patent:

49313630, Jun 5, 1990

Filed:

Jun 12, 1989

Appl. No.:

7/365268

Inventors:

David E. Slutz - Worthington OH
Paul D. Gigl - Worthington OH
Gary M. Flood - Canal Winchester OH
Gary W. Smith - New Albany OH

Assignee:

General Electric Company - Worthington OH

International Classification:

G32B 900

US Classification:

428408

Abstract:

Disclosed is a brazed implement comprising a thermally-stable polycrystalline diamond compact, e. g. a compact of self-bonded diamond particles having a network of inter-connected empty pores dispersed throughout the compact, bonded to another of said compact or bonded to a cemented carbide support by a brazing filler metal disposed therebetween. The brazing metal comprises an alloy having a liquidus above about 700. degree. C. and containing an effective amount of chromium. Translational shear strengths exceed about 50 kpsi even upon furnace cycling of the brazed implements and often exceed 90 kpsi. The method for fabricating the brazed implement also is disclosed.

US Patent:

45364427, Aug 20, 1985

Filed:

May 2, 1983

Appl. No.:

6/488003

Inventors:

Harold P. Bovenkerk - Worthington OH
Paul D. Gigl - Worthington OH
Francis R. Corrigan - Westerville OH

Assignee:

General Electric Company - Worthington OH

International Classification:

B32B 516

US Classification:

428323

Abstract:

Optical windows for hostile environments have been made from diamond and adamantine boron nitride compacts. The compact windows can comprise a single layer of large crystals bonded in a matrix. For example, they are made by exposing a sample of diamond (425-1700 micron) in a diamond and graphite matrix to high pressure-high temperature conditions (e. g. , 50 Kbar at 1400. degree. C. to 85 Kbar at 1800. degree. C. ). A typical boron nitride reaction zone assembly (cell) is shown in FIG. 1, in which carbon heater tube 1 is surrounded by tantalum foil sleeve 2. The sample of pyrolytic boron nitride 3 is disposed between carbon discs 5, tantalum foil discs 4 and hot pressed boron nitride plugs 6. The optical windows produced are capable of transmitting infrared light and visible light.

US Patent:

47386894, Apr 19, 1988

Filed:

Oct 16, 1986

Appl. No.:

6/920041

Inventors:

Paul D. Gigl - Worthington OH
Bonnie M. Hammersley - La Plata MD
David E. Slutz - Worthington OH

Assignee:

General Electric Company - Schenectady NY

International Classification:

B24D 302

US Classification:

51295

Abstract:

Disclosed is an improved polycrystalline compact of self-bonded diamond particles having a network of interconnected empty pores dispersed throughout. The improved porous polycrystalline diamond compact possesses enhanced oxidation resistance and comprises all of the exterior surfaces of the porous compact being enveloped with a continuous coating which is effective under metal bond fabrication conditions so that oxidation of the diamond in the compact does not exceed a threshold level whereat loss of diamond properties of the compact occurs. Metal bond fabrication conditions comprehend an atmosphere containing oxygen or water vapor. Metal coatings are preferred, especially in coating thicknesses in excess of about 8 microns, and applied by a chemical vapor deposition process.

US Patent:

42243807, Sep 23, 1980

Filed:

Mar 28, 1978

Appl. No.:

5/890898

Inventors:

Harold P. Bovenkerk - Worthington OH
Paul D. Gigl - Worthington OH

Assignee:

General Electric Company - Worthington OH

International Classification:

C22C 300
B24D 300

US Classification:

428545

Abstract:

In one embodiment, a compact for tools, such as cutting, drilling and shaping tools, consists essentially of self-bonded abrasive particles. The bonded particles define a substantially continuous interconnected network of pores, dispersed throughout the compact. The method for making such a compact comprises the steps of bonding a mass of abrasive particles, aided by a sintering aid material, under high temperatures and pressures (HP/HT) to form an abrasive body comprised of said particles in a self-bonded form and said material infiltrated throughout the body. The body is then treated to remove substantially all infiltrated material, thereby to produce a compact consisting essentially of the self-bonded abrasive particles. In another embodiment, a composite compact which is made in a similar manner to the first embodiment consists essentially of a layer of self-bonded abrasive particle and a substrate layer (preferably of cemented carbide) bonded to the abrasive particle layer.

US Patent:

45251797, Jun 25, 1985

Filed:

Oct 14, 1983

Appl. No.:

6/542081

Inventors:

Paul D. Gigl - Worthington OH

Assignee:

General Electric Company - Worthington OH

International Classification:

B24D 302

US Classification:

51309

Abstract:

The high pressure/high temperature (HP/HT) process for making diamond or CBN compacts has been modified by placing partitions within the crystal mass before HP/HT processing. With reference to FIG. 3, within the shield metal sleeve 11 and shield metal cup 14 are placed pliable metal shapes 20 in a honeycomb pattern. The abrasive crystals within the tubes 18 and outside the tubes 26 is sintered, and a compact containing the tubes embedded therein results. This compact can be acid leached to give a plurality of small compacts which need little if any additional shaping. The partitions can also be left intact as chip arresters.

US Patent:

60662905, May 23, 2000

Filed:

Feb 5, 1999

Appl. No.:

9/246077

Inventors:

Mahlon Denton Dennis - Kingwood TX
Rustum Roy - State College PA
Dinesh Agrawal - State College PA
Paul Gigl - Lemont PA

Assignee:

The Pennsylvania State Research Foundation - University Park PA
Dennis Tool Co. - Houston TX

International Classification:

B22F 312

US Classification:

419 38

Abstract:

This disclosure sets forth a method and apparatus for microwave processing of green work pieces. Typically, individual green work pieces are formed in a small mold cavity crucible, and individual crucibles are then indexed into and out of a tube for a controlled transit time along the tube. The tube extends in one embodiment through a preheater and then into the microwave cavity, the preheater providing an initial heating step to change the rate of absorption of microwave energy so that microwave sintering is accomplished in the cavity.

US Patent:

42551650, Mar 10, 1981

Filed:

Dec 22, 1978

Appl. No.:

5/972345

Inventors:

Mahlon D. Dennis - Columbus OH
Paul D. Gigl - Worthington OH

Assignee:

General Electric Company - Worthington OH

International Classification:

B24D 306

US Classification:

51309

Abstract:

One or more masses of bonded particles of diamond, cubic boron nitride (CBN), and wurtzite boron nitride (WBN) are sandwiched between or encapsulated by two masses of cemented carbide bonded to the particle masses. In the preferred embodiment, the particle masses are comprised of (1) at least 70% by volume of said particles, and (2) a metallic phase comprised of the cementing agent of the carbide mass. The composite compacts find utility in drill bit, mining tool and wear part applications. A method for making such a composite compact comprises (1) placing within a reaction cell masses of abrasive particles and at least two carbide masses interleaved with the abrasive particle masses, (2) the masses are placed in the cell in such a manner to allow for the accommodation of pressure and (3) simultaneously subjecting the cell and the contents thereof to temperature and pressure conditions at which the particles are stable. A method for abrading or cutting a workpiece with a composite compact comprises providing (1) a tubular carbide mass and a bonded mass of abrasive particles disposed in and bonded to the carbide mass in a central cavity thereof and (2) moving either the compact or workpiece relative to the other to provide the cutting or abrading action.