Double-layer metal sheet and method of fabricating the same

a metal sheet and double-layer technology, applied in the field of double-layer metal sheets and methods of fabricating the same, can solve problems such as complicated processes, and achieve the effect of reducing or preventing warpage and reducing shrinkage differences
US20050019199A1Inactive Publication Date: 2005-01-27AGENCY FOR SCI TECH & RES
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
AGENCY FOR SCI TECH & RES
Publication Date
2005-01-27
Estimated Expiration
Not applicable · inactive patent

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Abstract

A method of bonding two powder components having different shrinkage factors, one of which is metal powder, is disclosed herein. In the preferred method, at step 1.1, each powder component is separately mixed with a powder binder to substantially match the other powder component's shrinkage factor. Then at steps 1.2 to 1.4, the powder component mixtures are compacted in a die set to form a green compact. Next at step 1.5, the green compact is debindered and at step 1.6, the green compact is sintered in a furnace while applying pressure on a surface of the green compact during the sintering process. In this way, the two powder components can be bonded directly without a need for an intermediate gradient zone and a double-layer metal sheet can be thus formed.
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Description

BACKGROUND AND FIELD OF THE INVENTION

[0001] This invention relates to a method for bonding two metal powder components having different shrinkage factors using powder metallurgy, more particularly but not exclusively, for fabricating double layer metal parts, sheets or components.

[0002] It is widely known that formation or fabrication of a double layer metal component using powder processing requires an intermediate gradient material composition disposed between the two layers of metal powder. The intermediate gradient material is a mixture of the two material powders to be bonded to mutually compensate the respective shrinkage factor of each material and thus provides a region or zone to allow a gradual change between the two material powders when the two layers are sintered together. This alleviates deformation or warpage of the two layers during sintering.

[0003] However, the use of the intermediate gradient zone creates extra process steps of preparing the intermediate mixture...

Claims

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