Metal and graphite laminate
The present invention is a laminate sheet having two laminae. The first lamina is a relatively hard material having first and second surfaces. The first surface has a plurality of raised and generally pointed piercing structures, each structure having a tip. The second lamina is graphite foil material, which is mated to the relatively hard material, such that at least some of the piercing structures pierce the graphite foil material. In one embodiment, the first lamina has no performations and is uniformly smooth. In another embodiment, the second surface also has a plurality of piercing structures and a third lamina comprising graphite foil is mated to the second surface.
1. A method for producing a multi-layer laminate sheet, the method comprising:
a) supplying a sheet metal core to a lamination station, the sheet metal core having a first face that is textured with a first plurality of raised and generally pointed piercing structures, and an opposed second face that is textured with a second plurality of raised and generally pointed piercing structures, wherein the first plurality of raised and generally pointed piercing structures and the second plurality of raised and generally pointed piercing structures are hook-shaped;
b) supplying a first layer of graphite foil to the lamination station, the first layer of graphite foil having a first layer inner face and an opposed first layer outer face,
c) forcing together the sheet metal core and the first layer of graphite foil to pierce the first layer inner face with the first plurality of raised and generally pointed piercing structures;
d) supplying a second layer of graphite foil to the lamination station, the second layer of graphite foil having a second layer inner face and an opposed first layer outer face; and
e) forcing together the sheet metal core and the second layer of graphite foil to pierce the second layer inner face with the second plurality of raised and generally pointed piercing structures.
2. The method of claim 1 , wherein in step c), the first plurality of raised and generally pointed piercing structures do not protrude through the first layer outer face.
3. The method of claim 1 , wherein in step e), the second plurality of raised and generally pointed piercing structures do not protrude through the second layer outer face.
4. The method of claim 1 , wherein steps a), b), and d) are carried out simultaneously.
5. The method of claim 1 , wherein steps c) and e) are carried out simultaneously.
6. The method of claim 5 , wherein steps c) and e) comprise feeding the sheet metal core, the first layer of graphite foil, and the second layer of graphite foil between rollers.
7. The method of claim 1 , wherein the sheet metal core is a sheet steel core.
8. The method of claim 1 , wherein the sheet metal core does not include perforations associated with the first plurality of raised and generally pointed piercing structures or the second plurality of raised and generally pointed piercing structures.