Yang Cheng

US Patent:

7195817, Mar 27, 2007

Filed:

Sep 29, 2003

Appl. No.:

10/673762

Inventors:

Leonid C Lev - West Bloomfield MI, US
Yang T Cheng - Rochester Hills MI, US
Michael J Lukitsch - Port Huron MI, US
Anita M Weiner - West Bloomfield MI, US

Assignee:

General Motors Corporation - Detroit MI

International Classification:

G11B 5/64

US Classification:

428336, 51307, 51309, 428216, 428408, 428469, 428472, 428697, 428698, 428699

Abstract:

A diamond coated cutting tool is disclosed having a either steel or cemented carbide substrate. The interior layer disposed between the diamond coating and the substrate inhibits the diffusion of carbon and other species.

US Patent:

7879402, Feb 1, 2011

Filed:

Mar 1, 2007

Appl. No.:

11/680777

Inventors:

Leonid C. Lev - West Bloomfield MI, US
Jon T. Carter - Farmington MI, US
Yang T. Cheng - Troy MI, US
Carolina C. Ang - Bloomfield MI, US

Assignee:

GM Global Technology Operations LLC - Detroit MI

International Classification:

B23B 47/28

US Classification:

427307, 408 1 R

Abstract:

A method for forming an aperture includes stamping an aperture into the article using a pellet, and refining aperture shape(s) and/or aperture dimensions. Methods for forming articles having reduced residual compressive stress are also disclosed. Very generally, the methods include establishing a diamond coating on at least a portion of a substrate, and applying a stress-relief process to the diamond coating, the substrate, or combinations thereof.

US Patent:

8092922, Jan 10, 2012

Filed:

Jun 30, 2008

Appl. No.:

12/165627

Inventors:

Leonid C. Lev - West Bloomfield MI, US
Michael J. Lukitsch - Marysville MI, US
Yang T. Cheng - Troy MI, US
Anita M. Weiner - West Bloomfield MI, US
Robert F. Paluch - Allenton MI, US
Neil E. Anderson - Novi MI, US

Assignee:

GM Global Technology Operations LLC - Detroit MI

International Classification:

B32B 15/04

US Classification:

428627, 428610

Abstract:

A layered coating is disclosed herein. The layered coating includes a chromium layer, an intermediate layer of chromium and nitrogen established on the chromium layer, and an outer layer of chromium and nitrogen established on the intermediate layer. The intermediate layer has a gradually changing composition, wherein the chromium concentration decreases from an area of the intermediate layer adjacent the chromium layer towards a surface of the layered coating.

US Patent:

8357429, Jan 22, 2013

Filed:

Dec 28, 2010

Appl. No.:

12/979916

Inventors:

Leonid C. Lev - West Bloomfield MI, US
Jon T. Carter - Farmington MI, US
Yang T. Cheng - Troy MI, US
Carolina C. Ang - Bloomfield MI, US

Assignee:

GM Global Technology Operations LLC - Detroit MI

International Classification:

C23C 16/00
C23C 16/27

US Classification:

4272498, 4272481, 4272491

Abstract:

A method for forming an aperture includes stamping an aperture into the article using a pellet, and refining aperture shape(s) and/or aperture dimensions. Methods for forming articles having reduced residual compressive stress are also disclosed. Very generally, the methods include establishing a diamond coating on at least a portion of a substrate, and applying a stress-relief process to the diamond coating, the substrate, or combinations thereof.

US Patent:

8603703, Dec 10, 2013

Filed:

Jul 26, 2006

Appl. No.:

11/459950

Inventors:

Daniel E. Rodak - Southfield MI, US
Yang T. Cheng - Troy MI, US
Mei Cai - Bloomfield Hills MI, US
Martin S. Ruthkosky - Sterling Heights MI, US

Assignee:

GM Global Technology Operations LLC - Detroit MI

International Classification:

H01M 4/64
H01M 8/00

US Classification:

429518, 429400

Abstract:

A method for embedding a hydrophilic and electrically conductive layer into a flow field plate or bipolar plate for a fuel cell. In one embodiment, the layer is niobium doped titanium oxide in a powder form. The method includes mixing the powder material in a suitable solution, such as a solvent. The solution is deposited on a substrate, such as a stainless steel substrate, by any suitable process, such as brushing. The substrate is then heated so that the solvent evaporates to leave a coating of the powder material. The substrate is then positioned in a die press and is stamped to the shape of the bipolar plate, where the stamping operation embeds the powder material into an outer surface of the bipolar plate.

US Patent:

20060168806, Aug 3, 2006

Filed:

Mar 30, 2006

Appl. No.:

11/393248

Inventors:

Carolina Ang - Bloomfield MI, US
Jean Dasch - Bloomfield Township MI, US
Yang Cheng - Troy MI, US
Vadim Rezhets - Cape Coral FL, US
Bob Powell - Birmingham MI, US
Robert Paluch - Allenton MI, US

International Classification:

B21K 3/00

US Classification:

029888010

Abstract:

Additions of small but effective amounts of one or more of bismuth, indium, lead and/or tin to an aluminum casting alloy markedly improved the dry machinability of a casting made from the modified alloy. The added elements, which are softer and lower melting than the matrix alloy form as small globules dispersed in the microstructure of the aluminum casting. These globules do not adversely affect the strength or hardness of the casting but enable the casting to be machined without the use of a cooling and lubricating machining fluid.

US Patent:

20070215253, Sep 20, 2007

Filed:

Mar 16, 2007

Appl. No.:

11/687212

Inventors:

Jean Dasch - Bloomfield Township MI, US
Yang Cheng - Troy MI, US
Richard Waldo - White Lake MI, US

International Classification:

C22F 1/04

US Classification:

148577000, 148713000, 148028000

Abstract:

A nanofluid for dissipating friction and heat during machining includes a fluidic vehicle and a plurality of lubricious nanoparticles dispersed throughout the fluidic vehicle. A method for reducing material transfer during machining processes includes reducing a temperature of at least a portion of an article to be machined at least one of prior to machining, during machining, or combinations thereof.

US Patent:

20070256763, Nov 8, 2007

Filed:

May 3, 2006

Appl. No.:

11/416921

Inventors:

Carolina Ang - Bloomfield MI, US
Jean Dasch - Bloomfield Township MI, US
Yang Cheng - Troy MI, US

International Classification:

C22F 1/04

US Classification:

148552000

Abstract:

Additions of small but effective amounts of one or more of bismuth, indium, lead and/or tin to a silicon-containing aluminum casting alloy markedly improves the dry machinability of a casting made from the modified alloy. But dry machining of such castings is synergistically improved by the use of cutting tools with cutting surfaces coated with microcrystalline diamond or diamond-like carbon coatings. The use of such carbon-coated tools enables remarkable improvement in dry machinability even at reduced levels of the soft metal in the alloy.