Method of bonding a metal to a substrate

A metal and substrate technology, applied in the direction of metal material coating process, coating, hot-dip coating, etc.

Inactive Publication Date: 2012-11-28
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The presence of lighter weight materials reduces the overall weight of automotive parts in some cases

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  • Method of bonding a metal to a substrate
  • Method of bonding a metal to a substrate
  • Method of bonding a metal to a substrate

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Embodiment Construction

[0041] Aluminum and steel can be used to make different car parts, at least because these materials have mechanical strength that contributes to the structural integrity of the part. It has been found that some aluminum or steel in the parts can be replaced with lighter weight materials such as magnesium. It is believed that the presence of lighter weight materials will reduce the total weight of automotive parts in some cases.

[0042] It has been found that magnesium can be incorporated into aluminum or steel parts via a casting method such as a method called overflow casting. It has also been found that in some cases magnesium cannot be metallurgically bonded to the underlying aluminum or steel, at least not to the extent necessary to form parts that are considered structurally sound and can be used in automobiles. For example, aluminum may include a dense oxide surface layer (e.g., aluminum oxide) formed thereon, which prevents metallurgical bonding of magnesium to aluminum ...

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Abstract

A method of bonding a metal to a substrate involves forming an oxide layer on a surface of the substrate, and in a molten state, over-casting the metal on the substrate surface. The over-casting drives a reaction at an interface between the over-cast metal and the oxide layer to form another oxide. The other oxide binds the metal to the substrate surface upon solidification of the over-cast metal.

Description

[0001] Cross-Referenced Related Applications [0002] This application claims the benefit of US Provisional Patent Application Serial No. 61 / 488995, filed May 23, 2011. technical field [0003] The present invention generally relates to methods of bonding metals to substrates. Background of the invention [0004] Many automotive parts are made, for example, of aluminum or steel. In some cases, it may be desirable to replace at least a portion of the aluminum or steel parts with lighter-weight materials such as magnesium. The presence of lighter weight materials can in some cases reduce the overall weight of the automotive part. Contents of the invention [0005] Methods of bonding metals to substrates are disclosed herein. The method includes forming an oxide layer on the substrate surface, and overcasting the metal in a molten state onto the substrate surface. The overcasting drives a reaction at the interface between the overcasting metal and the oxide layer to form...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D19/08B22D19/16
CPCB22D19/08C23C6/00
Inventor M.J.沃克A.K.萨奇德夫B.R.小鲍威尔A.A.罗
Owner GM GLOBAL TECH OPERATIONS LLC
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