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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

Inactive Publication Date: 2005-01-27
AGENCY FOR SCI TECH & RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006] i. mixing one of the powder components with a powder binder to reduce the shrinkage difference between the powder components,
[0010] An advantage of the described embodiment of the invention is that the two metal powder components can be bonded without an intermediate gradient zone. The use of an appropriate amount of pressure during the sintering process helps to control the shrinkage of the compact and reduces or prevents warpage thereof.

Problems solved by technology

However, the use of the intermediate gradient zone creates extra process steps of preparing the intermediate mixture and arranging the mixture between the two layers during the fabricating process which may further complicate the process.

Method used

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  • Double-layer metal sheet and method of fabricating the same
  • Double-layer metal sheet and method of fabricating the same
  • Double-layer metal sheet and method of fabricating the same

Examples

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Embodiment Construction

[0029] A preferred embodiment of the invention will be described using an example of fabricating a double layer metal plate using powder metallurgy and FIG. 1 shows a flowchart depicting the fabrication steps.

[0030] In this embodiment, an iron (Fe) based powder material, hereinafter referred to as powder A is used to form the first metal layer. For the second metal layer, nickel (Ni) powder is used. It should be apparent that the described embodiment is also applicable to other types of metal such as titanium (Ti), stainless steel metal powder or other alloys.

[0031] Powders A and B have different shrinkage factors and to reduce the shrinkage difference, a powder binder, such as wax powder binder is used. As shown in FIG. 1, at step 1.1, powders A and B are separately mixed with respective proportions of the powder binder using an experimental blender.

[0032] In this embodiment, to achieve the desired results, typically powder B is mixed or blended with 3 to 5 wt % wax powder binde...

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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.

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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Application Information

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IPC IPC(8): B22F7/06
CPCB22F7/06
Inventor LI, QINGFAHO, MENG KWONGZHANG, SU XIA
Owner AGENCY FOR SCI TECH & RES
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