Nicholas G Grant

US Patent:

48851280, Dec 5, 1989

Filed:

Jul 30, 1985

Appl. No.:

6/760632

Inventors:

Janez Megusar - Belmont MA
Otto K. Harling - Hingham MA
Nicholas J. Grant - Winchester MA

International Classification:

G21C 101
G21C 1903
G21C 1600
G21B 100

US Classification:

376463

Abstract:

Method for extending service life of nuclear reactor components prepared from ductile, high strength crystalline alloys obtained by devitrification of metallic glasses. Two variations of the method are described: (1) cycling the temperature of the nuclear reactor between the operating temperature which leads to irradiation damage and a l The U. S. Government has rights in this invention by virtue of Department of Energy, Office of Fusion Energy, Grant No. DE-AC02-78ER-10107.

US Patent:

50493353, Sep 17, 1991

Filed:

Jan 25, 1989

Appl. No.:

7/301868

Inventors:

Toshiro Kuji - Agro, JP
Robert C. O'Handley - Andover MA
Nicholas J. Grant - Winchester MA

Assignee:

Massachusetts Institute of Technology - Cambridge MA

International Classification:

B02C 402
B22D 1100
B28B 312

US Classification:

264140

Abstract:

A magnetic material melt is solidified by cooling the material from two opposing surfaces while deforming the material by applying compressive pressure to the two opposing surfaces. Twin roller quenching is a preferred method for producing the flakes. The flakes exhibit strong texture normal to their surface, that is, there is a high degree of alignment of the magnetically easy axes of the crystals within the polycrystalline flake. The strong crystal orientation appears to result both from directional solidification in a thermal gradient and uniaxial deformation of the solid phase in the twin rollers. Magnetization studies on individual flakes show intrinsic coercivities of 14 kOe and a nearly 50% higher remanance for field normal to the flake surface than in the flake plane. Splat quenching is another suitable technique for carrying out the invention.

US Patent:

48656526, Sep 12, 1989

Filed:

Jun 24, 1988

Appl. No.:

7/211341

Inventors:

Janez Megusar - Belmont MA
Nicholas J. Grant - Winchester MA

Assignee:

Massachusetts Institute of Technology - Cambridge MA

International Classification:

C21D 800
C21D 810
B06B 300

US Classification:

148 3

Abstract:

A process for improving the swelling resistance of a titanium-modified austenitic stainless steel that involves a combination of rapid solidification and dynamic compaction techniques.

US Patent:

45795878, Apr 1, 1986

Filed:

Jan 28, 1985

Appl. No.:

6/695669

Inventors:

Nicholas J. Grant - Winchester MA
Charles H. Smith - Schenectady NY

Assignee:

Massachusetts Institute of Technology - Cambridge MA

International Classification:

C22C 100

US Classification:

75 05R

Abstract:

Metal powder-oxide compositions are provided suitable for forming high strength composite products. The compositions comprise powdered flake-like metal alloys having a thickness between 0. 5 and 2 microns wherein the oxide comprises between 0. 5 and 5 weight percent of the composite compositions.

US Patent:

40849643, Apr 18, 1978

Filed:

Mar 5, 1976

Appl. No.:

5/664208

Inventors:

Nicholas J. Grant - Winchester MA
Ramon K. Robinson - Richland WA

Assignee:

Massachusetts Institute of Technology - Cambridge MA

International Classification:

C22C 1908

US Classification:

75171

Abstract:

A new class of cobalt-based alloys and the like containing hafnium carbide (HfC) of particle size finer than about 3 microns and containing HfC in the range 2 to 15% by volume. The class has good strength characteristics at both very high and very low temperatures, it exhibits very good stability, and it has excellent oxidation characteristics even at temperatures at 2000. degree. F and above. In addition, the alloy has ductility and low-temperature toughness characteristics that make it attractive for wrought processes.

US Patent:

44858345, Dec 4, 1984

Filed:

Dec 4, 1981

Appl. No.:

6/327698

Inventors:

Nicholas J. Grant - Winchester MA

International Classification:

B22D 2300

US Classification:

164 46

Abstract:

The die comprises at least one set of opposed linearly configurated die elements spaced in substantially parallel relationship to define a longitudinally configurated die space therebetween dimensioned to pass therethrough a sheet of the molten material, the die elements defining a nozzle assembly characterized by oppositely disposed orifice-bearing surfaces. Each of the linear die elements has a gas pressure manifold for receiving atomizing gas under superatmospheric pressure, each of the oppositely disposed nozzle-defining surfaces having at least one array of orifices extending therealong and embracing each side of the longitudinally configurated die space defined by the oppositely disposed linear die elements. Conduits are provided for communicating the orifices with the gas manifold, the array of orifices in each of the die elements being convergently directed towards the other through an included angle of, for example, 40. degree. for directing atomizing gas against a predetermined focal region on a sheet of molten material passing through the longitudinal die space, each of the orifice conduits connected to resonating cavities for generating ultrasonic, high frequency shock waves for one-step disintegration of the sheet of molten material at said focal region into fine atomized particles which later solidify.

US Patent:

52250040, Jul 6, 1993

Filed:

Apr 30, 1991

Appl. No.:

7/694002

Inventors:

Robert C. O'Handley - Andover MA
Nicholas J. Grant - Winchester MA
Yutaka Hara - Tokyo, JP
Enrique J. Lavernia - Tustin CA
Tetsuji Harada - Ageo, JP
Teiichi Ando - Watertown MA

Assignee:

Massachusetts Institute of Technology - Cambridge MA

International Classification:

H01F 102

US Classification:

148101

Abstract:

Bulk rapidly solidified magnetic materials having a density of greater than 90%, a thickness of at least 250 microns, and preferably a low oxygen content, are produced by a liquid dynamic compaction process which, depending upon the chosen operating conditions, can yield materials ranging from crystalline to partially crystalline to amorphous. The materials so produced are directly useful, i. e. without having to be reduced to a powder and consolidated into a shape, to produce permanent magnets. When the materials are amorphous, they can be directly used as soft magnetic materials and for other purposes.

US Patent:

44810342, Nov 6, 1984

Filed:

Sep 13, 1982

Appl. No.:

6/417671

Inventors:

Nicholas J. Grant - Winchester MA
Ramon K. Robinson - Bellevue WA

Assignee:

Massachusetts Institute of Technology - Cambridge MA

International Classification:

C22C 1908

US Classification:

75236

Abstract:

Disclosed is a process for forming a new group of cobalt-based alloys containing 3-18% hafnium carbide (HfC), the HfC having a particle size finer than about three microns. The class of alloys exhibits excellent tensile strength characteristics at very low temperatures, exhibits very good time-temperature stability, and shows excellent oxidation characteristics even at temperatures above about 1000. degree. C. In addition, the alloy is attractive for use in the wrought state because of its ductility and low-temperature toughness characteristics.