US 7,451,906 B2Granted

Products for use in low temperature fluxless brazing

AssigneeDana Canada Corporation

InventorsBrian E. Cheadle, Robert H. Krueger, Feng Liang, Mark S. Kozdras

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Abstract

A brazing product for low temperature fluxless brazing comprises a filler metal-forming composition which melts in the range from about 380-575° C. The filler metal-forming composition comprises zinc optionally in combination with aluminum and/or silicon, and further comprises at least one braze promoter selected from nickel, cobalt, iron and palladium. The filler metal-forming composition may comprise a single layer or may comprise a number of distinct layers. The brazing product may take the form of a brazing preform or a brazing sheet or casting in which the filler metal-forming composition is deposited on a non-consumable substrate. The substrate may preferably comprise aluminum or an aluminum alloy, but may instead be comprised of one or more metals other than aluminum.

Claims39

Dependent claims

A brazing product for fluxless brazing comprising a filler metal-forming composition comprised of a plurality of layers, including:

(a) at least one temperature modifier layer, wherein said at least one temperature modifier layer has an overall zinc content of about 25-100% by weight of the at least one temperature modifier layer, an overall aluminum content of up to about 65% by weight of the temperature modifier layer, and an overall silicon content of up to about 18% by weight of the temperature modifier layer;
and
(b) at least one braze-promoting layer, wherein said at least one braze-promoting layer comprises at least one braze-promoting metal selected from nickel, cobalt, iron and palladium;
wherein the filler metal-forming composition melts completely at a braze temperature in the range of about 380-575° C.;
wherein said at least one braze-promoting layer comprises said at least one braze-promoting metal in an amount of from about 1-10% by weight of the filler metal-forming composition;
and
wherein said at least one temperature modifier layer comprises zinc in an amount of about 25-99% by weight of the filler metal-forming composition, aluminum in an amount of up to about 65% by weight of the filler metal-forming composition, and silicon in an amount of up to about 18% by weight of the filler metal-forming composition.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/175,053Filed 6 Jul 2005 · continuation in part
Priority: 21 Nov 2001
Published: US 2006/0027625 A19 Feb 2006
Granted: 18 Nov 2008
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

B23K 35/282
With the principal constituent melting at less than 950°C: zn as the principal constituent
Y10T 428/12736
Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]: al-base component
Y10T 428/12743
Al-base component: next to refractory [Group IVB, VB, or VIB] metal-base component
Y10T 428/1275
Al-base component: next to Group VIII or IB metal-base component

Family

Application09/990,507Parent of this continuation-in-part · filed 21 Nov 2001
Application10/300,837Parent of this continuation-in-part · filed 21 Nov 2002
Application10/300,836Parent of this continuation-in-part · filed 21 Nov 2002
Application10/424,133Parent of this continuation-in-part · filed 28 Apr 2003
US 6,815,086 B2Parent of this continuation-in-part · filed 9 Nov 2004
US 6,913,184 B2Parent of this continuation-in-part · filed 5 Jul 2005
US 2006/0027625 A1Pre-grant publication · published 9 Feb 2006
US 7,000,823 B2Parent of this continuation-in-part
US 2003/0098338 A1Published application
US 2003/0155409 A1Published application
US 2003/0189082 A1Published application
US 2004/0035910 A1Published application
US 7,451,906 B2This patent

From the US filing history. Foreign family members aren’t listed.