Reducing metals as a brazing flux

• US 20030201308A1
• Filed: 04/15/2003
• Published: 10/30/2003
• Est. Priority Date: 02/20/2001
• Status: Active Grant

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Palmgren, Gary M.
• Granted Patent: US 6,858,050 B2
• Time in Patent Office: Days
• US Class Current: 228/122.1
• CPC Class Codes: B23K 1/008 Soldering within a furnace B23K1/012 takes precedence
• CPC Class Codes: B23K 1/19 taking account of the properties of the materials to be soldered
• CPC Class Codes: B23K 35/001 Interlayers, transition pieces for metallurgical bonding of workpieces
• CPC Class Codes: B23K 35/0238 layered
• CPC Class Codes: Y10T 428/12535 with additional, spatially distinct nonmetal component
• CPC Class Codes: Y10T 428/12611 Oxide-containing component
• CPC Class Codes: Y10T 428/12736 Al-base component
• CPC Class Codes: Y10T 428/12979 Containing more than 10% nonferrous elements [e.g., high alloy, stainless]

Abstract

The present invention comprises a method of manufacturing a brazed body. The method comprises forming a multi-layer assembly comprising: a first material capable of forming a first oxide and having a melting temperature higher than 660° C.; a first reducing metal adjacent the first material, the reducing metal capable of reducing at least a portion of the first oxide on the first material a braze adjacent to the reducing metal; and a second material adjacent the braze, the second material comprising a material having a melting temperature higher than 660° C. The method then comprises creating a vacuum around the assembly, and heating the assembly to melt the reducing metal and the braze. The assembly is then subject to cooling to thereby form the brazed body.

Claims

1. A brazed body comprising

(a) a first layer comprising a first material, the first material having a melting temperature higher than 660°

C.;

(b) a second layer comprising a second material, the second material having a melting temperature higher than 660°

C.; and

(c) a filler layer between the first layer and the second layer, the filler layer comprising a multi-phase alloy having a braze and aluminum oxide.

2. The brazed body of claim 1 further comprising abrasive particles in the first or second layer.

3. An abrasive article comprising

(a) a first layer comprising a fused abrasive body;

(b) a second layer comprising a material having a melting temperature higher than 660°

C.; and

(c) a filler layer between the first layer and the second layer, the filler layer comprising a multi-phase alloy comprised of a braze and a reducing metal oxide.

5. The abrasive article of claim 3 wherein the metal is stainless steel.

4. An abrasive article comprising

a plurality of abrasive particles;

a metal having a melting temperature greater than 660°

C.; and

a filler layer between the metal and the abrasive particles comprising braze and aluminum oxide.

6. A multi-layer brazing assembly comprising

(a) a braze metal foil layer;

and

(b) an aluminum layer covering at least part of one surface of the braze, the aluminum layer being between about 1 micrometer and 20 micrometers thick.

7. The multi-layer brazing assembly of claim 6 wherein the aluminum layer is about 8 micrometers thick.