Sadashiv K Nadkarni

US Patent:

6350532, Feb 26, 2002

Filed:

Jan 18, 2000

Appl. No.:

09/381882

Inventors:

Thomas L. Davisson - Chardon OH
Luc Montgrain - Terre Haute IN
Daniel Pulliam - Terre Haute IN
Sadashiv Nadkarni - Lexington MA

Assignee:

Alcan International Ltd. - Montreal

International Classification:

B21C 3700

US Classification:

428606, 148551, 148552, 148696, 148416, 148438, 420529, 420537, 420538, 420548, 420550, 420553

Abstract:

The invention relates to a recyclable aluminum foil. The foil is made of an alloy containing 0. 2%-0. 5% Si, 0. 4%-0. 8% Fe, 0. 1%-0. 3% Cu, and 0. 05%-0. 3% Mn by weight. with the balance aluminum and incidental impurities. The foil contains at least about 2% by weight of strengthening particulates and has at least about 0. 1% by weight of the copper and/or manganese retained in solid solution. The invention also relates to a method of manufacturing a sheet of aluminum based on an alloy which involves continuously casting an alloy of the above composition to form a sheet of alloy, coiling said sheet of alloy, cold rolling the sheet of alloy, interannealing the alloy after a first pass of the cold rolling; and further cold rolling the alloy to a final desired gauge. The foil, which is suitable for household use, has improved strength due to a larger quantity of dispersoids fortified by elements in solid solution, and can be recycled with other alloy scrap.

US Patent:

6533877, Mar 18, 2003

Filed:

Dec 6, 2000

Appl. No.:

09/622488

Inventors:

Thomas L. Davisson - Chardon OH
Luc M. Montgrain - Terre Haute IN
Sadashiv Nadkarni - Lexington MA

Assignee:

Alcan International Limited - Quebec

International Classification:

C22F 104

US Classification:

148552, 148696

Abstract:

High strength foil having dead fold foil characteristics is produced without the rolling and other production problems encountered with prior high strength foils by controlling manganese content, interannealing temperatures and, optionally, final annealing temperatures. The alloy contains 0. 05 to 0. 15 %, preferably 0. 095 to 0. 125%, manganese by weight. Cold worked sheet is interannealed at a temperature of about 200Â C. to about 260Â C. , preferably 230Â to 250 Â C. , to produce substantially fully recrystallized sheet while maintaining most of the manganese in solid solution. The interannealed sheet is rolled to final gauge and finally annealed, preferably at a temperature of about 250Â C. to about 325Â C. , more preferably about 260Â C.

US Patent:

7172664, Feb 6, 2007

Filed:

Jul 4, 2001

Appl. No.:

10/297941

Inventors:

Thomas L. Davisson - Chardon OH, US
Luc Montgrain - Terre Haute IN, US
Sadashiv Nadkarni - Lexington MA, US

Assignee:

Novelis Inc. - Toronto

International Classification:

C22F 1/04

US Classification:

148551, 148695

Abstract:

A method is described for making an aluminum alloy foil suitable for application to fins used in heat exchangers. The method comprises providing an aluminum alloy composition containing about 0. 27% to about 0. 55% by weight of iron, about 0. 06% to about 0. 55% by weight of silicon and optionally up to about 0. 20% by weight of copper; continuously casting a coiled strip from the molten aluminum alloy; cold rolling the continuously cast coil to a final gauge of about 0. 076 mm to about 0. 152 mm and partially annealing the aluminum alloy sheet at a temperature below about 260 C. , with a maximum overheat of about 10 C. to anneal the aluminum alloy foil substantially without any recrystallization.

US Patent:

7547463, Jun 16, 2009

Filed:

Jun 19, 2006

Appl. No.:

11/471171

Inventors:

Thomas L. Davisson - Chardon OH, US
Sadashiv Nadkarni - Bedford MA, US

Assignee:

Novelis Inc. - Toronto

International Classification:

B05D 1/00

US Classification:

427209, 427178, 427378, 427388, 427389, 428447, 428450, 428689, 524323, 524267, 524736, 524738, 524438

Abstract:

A method of imparting a non-stick coating to a surface of an aluminum foil sheet, and the resulting foil sheet. The method involves coating at least part (preferably at least 40%) of an area of a surface of a metal sheet article (preferably an aluminum foil sheet) with a substantially solvent-free silicone oil at an average coating application rate in a range of 1. 5 to 10 mg/ftof the coated surface area. The coated sheet article is then preferably coiled. The coated sheet article is then heated in the presence of air or oxygen at a temperature of 250 C. or higher for a period of time of at least 10 minutes. The treated surface is both non-stick and food-friendly.

US Patent:

20030133825, Jul 17, 2003

Filed:

Jan 17, 2002

Appl. No.:

10/051873

Inventors:

Tom Davisson - Chardon OH, US
Sadashiv Nadkarni - Lexington MA, US
Dave Wilbur - Grafton WV, US

International Classification:

C22C021/02

US Classification:

420/540000, 148/551000, 420/548000

Abstract:

The present invention provides an aluminum alloy foil for fins used in heat exchangers. The aluminum alloy composition consists essentially of about 0.25% to about 0.6% by weight of Si; about 0.15% to about 0.50% by weight of Fe; about 0.20% to about 0.70% by weight of Mn; less than about 0.05% Cu; and less than about 0.05% Mg, with the balance aluminum including unavoidable impurities. The alloy composition may also contain less than 0.10% Zn or 0.50-2.00% Zn. The invention also provides a method for making an aluminum alloy wherein during cold rolling interanneal is carried out at a gauge such that the cold work after internanneal is between about 30-70%.

US Patent:

20040213695, Oct 28, 2004

Filed:

Mar 31, 2004

Appl. No.:

10/815602

Inventors:

Adriano Ferreira - Oswego NY, US
Sadashiv Nadkarni - Bedford MA, US

International Classification:

C22C021/08

US Classification:

420/546000, 420/547000, 420/548000

Abstract:

Recycle friendly aluminum alloys are described which are variants of AA 3000 and AA 5000 series alloys containing higher than usual amounts of silicon and iron. The alloys contain in percentages by weight, more than 0.6-2.0% silicon, 0.9-2.4% iron, wherein the ratio of the amount of iron to the amount of silicon is in the range of 1.2-1.8:1. Other components of the alloys may include 0-0.4% copper, 0-1.5% manganese, 0-5.0% magnesium, 0-0.5% zinc, 0-3.5% chromium, 0-0.1% titanium and the balance aluminum and incidental impurities.

US Patent:

20050019205, Jan 27, 2005

Filed:

Aug 19, 2004

Appl. No.:

10/921660

Inventors:

Tom Davisson - Chardon OH, US
Sadashiv Nadkarni - Bedford MA, US
Dave Wilbur - Grafton WV, US

International Classification:

C22F001/04
C22C021/10

US Classification:

420540000, 420550000

Abstract:

The present invention provides an aluminum alloy foil for fins used in heat exchangers. The aluminum alloy composition consists essentially of about 0.25% to about 0.6% by weight of Si; about 0.15% to about 0.50% by weight of Fe; about 0.20% to about 0.70% by weight of Mn; less than about 0.05% Cu; and less than about 0.05% Mg, with the balance aluminum including unavoidable impurities. The alloy composition may also contain less than 0.10% Zn or 0.50-2.00% Zn. The invention also provides a method for making an aluminum alloy wherein during cold rolling interanneal is carried out at a gauge such that the cold work after internanneal is between about 30-70%.

US Patent:

20070023115, Feb 1, 2007

Filed:

Jun 20, 2006

Appl. No.:

11/472201

Inventors:

Adriano Ferreira - Oswego NY, US
Thomas Davisson - Chardon OH, US
Sadashiv Nadkarni - Bedford MA, US

International Classification:

C22F 1/04

US Classification:

148703000

Abstract:

A method of treating a surface of a metal foil or sheet to make the surface wettable. The method comprises obtaining a metal foil or sheet having an oil-coated surface to be treated, applying a solution of phosphoric acid in a polar, non-aqueous, water-free solvent evenly to the surface at a rate of application in a range of at least 10 mg/ft, the phosphoric acid being contained in the solution at a concentration such that the phosphoric acid contacts the surface in an amount of 0.5 to 2.0 mg/ft; and removing the solvent by either drying the surface or heating the foil or sheet at an elevated temperature above ambient to evaporate the oil from the surface to be treated with the proviso that the elevated temperature does not fall in the range between 130 to 240 C. The resulting foil has a wettable surface and can be used, for example, for coating with a layer of another material (e.g. polymer or adhesive) and achieve high peel strength.