Catherine R Wong

US Patent:

8141615, Mar 27, 2012

Filed:

Aug 21, 2009

Appl. No.:

12/545095

Inventors:

William A. Ferrando - Arlington VA, US
Catherine R. Wong - Germantown MD, US

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

B22D 19/14
B22D 13/00
F02F 1/00

US Classification:

164 97, 164114, 1231932

Abstract:

A method has been found for centrifugal casting engine cylinders. A mold is charged with molten aluminum alloy and particulate silicon monoxide having an average size of 0. 01 mm to 0. 04 mm. The mold is rotated at a velocity and period of time to distribute the particulate silicon monoxide on an inner cylinder surface. The mold is allowed to cool until the aluminum alloy solidifies. A casting is demolded characterized in a uniform inner cylinder surface of the particulate silicon monoxide in an amount of 25 volume % and thickness 1 to 5 millimeters. The engine cylinders are distinguished in resistance to wear. Cylinder liners show no appreciable wear for over 100,000 miles of use.

US Patent:

20120234439, Sep 20, 2012

Filed:

Mar 9, 2012

Appl. No.:

13/416654

Inventors:

Lawrence S. Kramer - Dayton MD, US
Catherine Wong - Germantown MD, US

Assignee:

CONCURRENT TECHNOLOGIES CORPORATION - Johnstown PA

International Classification:

C22F 1/04

US Classification:

148688

Abstract:

Aluminum-magnesium alloys are ideal for ship construction; however, these alloys can become sensitized and susceptible to intergranular corrosion when exposed to moderately elevated temperatures. A stabilization treatment has been developed to reverse sensitization and restore corrosion resistance, such that in-service plate can be refurbished rather than replaced. This treatment involves a short exposure to a specific elevated temperature range and can be implemented with portable units onboard a ship.