Pankaj Kumar Mehrotra

US Patent:

6610113, Aug 26, 2003

Filed:

May 22, 2000

Appl. No.:

09/576833

Inventors:

Pankaj K. Mehrotra - Greensburg PA
Mark A. Garman - Johnstown PA
Chuck E. Lipniskis - Greensburg PA
Frank B. Battaglia - Latrobe PA

Assignee:

Kennametal PC Inc. - Latrobe PA

International Classification:

C04B 3518

US Classification:

51308, 264655, 264665, 407119

Abstract:

A process for making a heat treated ground ceramic cutting tool and the resultant cutting tool. The process comprising the steps of: providing an uncoated ground ceramic cutting tool having at least a portion thereof ground; and heat treating the uncoated ground ceramic cutting tool so as to form the heat treated ground ceramic cutting tool.

US Patent:

6737010, May 18, 2004

Filed:

Oct 25, 2001

Appl. No.:

10/033051

Inventors:

Pankaj K. Mehrotra - Greensburg PA
Mark A. Garman - Johnstown PA
Chuck E. Lipniskis - Greensburg PA
Frank B. Battaglia - Latrobe PA

Assignee:

Kennametal PC Inc. - Monrovia CA

International Classification:

B28B 1118

US Classification:

264604, 264162, 264234, 264235, 264655, 264663, 264678

Abstract:

A process for making a heat treated ground ceramic cutting tool and the resultant cutting tool. The process includes the steps of: providing an uncoated ground ceramic cutting tool having at least a portion thereof ground; and heat treating the uncoated ground ceramic cutting tool so as to form the heat treated ground ceramic cutting tool.

US Patent:

6905992, Jun 14, 2005

Filed:

Jul 30, 2002

Appl. No.:

10/208597

Inventors:

Pankaj K. Mehrotra - Greensburg PA, US
Shanghua Wu - Latrobe PA, US

Assignee:

Kennametal Inc. - Latrobe PA

International Classification:

C04B035/00

US Classification:

501 87, 501 88, 501 89, 501 92, 501 94, 501 951, 501 952, 501 961

Abstract:

A ceramic composite made by compacting a starting powder blend. The composite includes between about 50 volume percent and about 99 volume percent of a ceramic matrix; and between about 1 volume percent and about 50 volume percent as-processed silicon carbide whiskers. The ceramic composite having a fracture toughness (K) of greater than about 4. 0 MPam. The ceramic has a silicon carbide whisker density as measured in whiskers per square millimeter equal to or less than about 1500 times the volume percent of silicon carbide whiskers, but in a density sufficient for the ceramic composite to have the fracture toughness.

US Patent:

7455918, Nov 25, 2008

Filed:

Mar 12, 2004

Appl. No.:

10/799827

Inventors:

Pankaj K. Mehrotra - Greensburg PA, US
Charles G. McNerny - Greensburg PA, US
Peter R. Leicht - Latrobe PA, US

Assignee:

Kennametal Inc. - Latrobe PA

International Classification:

B32B 9/00

US Classification:

428701, 51307, 51309, 428698, 428702

Abstract:

A coated body that includes a substrate and a coating scheme on the substrate. The coating scheme on the substrate wherein the coating scheme includes an alpha-alumina coating layer that exhibits a platelet grain morphology at the surface of the alpha-alumina coating layer or a kappa-alumina coating layer that exhibits either a lenticular grain morphology or a polyhedra-lenticular grain morphology at the surface thereof or an alpha-kappa-alumina coating layer that exhibits either a large multifaceted grain morphology or a polyhedra-multifaceted grain morphology at the surface thereof.

US Patent:

7485278, Feb 3, 2009

Filed:

Feb 22, 2005

Appl. No.:

11/063292

Inventors:

Pankaj K. Mehrotra - Greensburg PA, US
Shanghua Wu - Latrobe PA, US

Assignee:

Kennametal Inc. - Latrobe PA

International Classification:

C01B 31/36

US Classification:

423345, 423344

Abstract:

A ceramic composite made by compacting a starting powder blend. The composite includes between about 50 volume percent and about 99 volume percent of a ceramic matrix; and between about 1 volume percent and about 50 volume percent as-processed silicon carbide whiskers. The ceramic composite having a fracture toughness (K) of greater than about 4. 0 MPam. The ceramic has a silicon carbide whisker density as measured in whiskers per square millimeter equal to or less than about 1500 times the volume percent of silicon carbide whiskers, but in a density sufficient for the ceramic composite to have the fracture toughness.

US Patent:

7785665, Aug 31, 2010

Filed:

Mar 31, 2006

Appl. No.:

11/395983

Inventors:

Pankaj K. Mehrotra - Greensburg PA, US
Charles G. McNerny - Greensburg PA, US
Peter R. Leicht - Latrobe PA, US

Assignee:

Kennametal Inc. - Latrobe PA

International Classification:

C23C 16/00

US Classification:

42725519, 42725515

Abstract:

A coated body that includes a substrate and a coating scheme on the substrate. The coating scheme on the substrate wherein the coating scheme includes an alpha-alumina coating layer that exhibits a platelet grain morphology at the surface of the alpha-alumina coating layer or a kappa-alumina coating layer that exhibits either a lenticular grain morphology or a polyhedra-lenticular grain morphology at the surface thereof or an alpha-kappa-alumina coating layer that exhibits either a large multifaceted grain morphology or a polyhedra-multifaceted grain morphology at the surface thereof.

US Patent:

8080312, Dec 20, 2011

Filed:

Jun 22, 2006

Appl. No.:

11/472921

Inventors:

Charles G. McNerny - Greensburg PA, US
Pankaj K. Mehrotra - Greensburg PA, US
Peter R. Leicht - Latrobe PA, US

Assignee:

Kennametal Inc. - Latrobe PA

International Classification:

B32B 9/00

US Classification:

428216, 428325, 428336, 428472, 428697, 428698, 428699, 428701, 428702

Abstract:

A coated body that includes a substrate and a coating scheme on the substrate. The coating scheme includes a CVD titanium carbonitride coating layer containing titanium carbonitride grains that are of a pre-selected grain size. The coating scheme further includes a first titanium/aluminum-containing coating layer containing first titanium/aluminum-containing grains applied so as to be farther away from the substrate than the titanium carbonitride coating layer. The first titanium/aluminum-containing grains are of a pre-selected grain size. The coating scheme also includes a CVD alumina coating layer containing alumina grains applied so as to be farther away from the substrate than the first titanium/aluminum-containing coating layer. The alumina grains are of a pre-selected grain size.

US Patent:

8221838, Jul 17, 2012

Filed:

Jun 12, 2008

Appl. No.:

12/137633

Inventors:

Charles G. McNerny - Greensburg PA, US
Pankaj K. Mehrotra - Greensburg PA, US
Peter R. Leicht - Latrobe PA, US

Assignee:

Kennametal Inc. - Latrobe PA

International Classification:

B05D 1/36
C23C 16/00

US Classification:

427255391, 42725532, 42725536, 4272557, 427402, 4274193

Abstract:

A method of making a coated body wherein the method includes the following sequential steps. First, providing a substrate Second, applying by chemical vapor deposition a titanium carbonitride coating layer that has a thickness equal to between about 0. 5 micrometers and about 25 micrometers Third, applying by chemical vapor deposition a first titanium/aluminum-containing coating layer that has a thickness between a greater than zero micrometers and about 5 micrometers. Fourth, applying by chemical vapor deposition an alumina coating layer that has a thickness between greater than zero micrometers and about 5 micrometers. The first titanium-containing coating layer and the alumina coating layer makes up a coating sequence, and the method includes applying a plurality of the coating sequences by CVD.