ELASTOMERIC GASKET HAVING A FOAM METAL SKELETAL MEMBER
A gasket for compressible placement between a first surface and a second surface is disclosed. In one embodiment, the gasket has a cellular metal skeleton embedded in a viscoelastic, pliable, deformable tacky polymer body. The skeleton has multiple strands, which connect to form multiple interconnected cells or pores. The skeleton, prior to being encapsulated in the tacky polymer body, is typically about 75% or more void space. The void space is substantially filled in the manufacture of the gasket, with the tacky uncured polymer. The uncured polymer will set up or cure, and then the gasket may be used.
1 . A gasket for compressible placement between a first surface and a second surface, the gasket comprising:
a viscoelastic, pliable, deformable, tacky polymer body; and
a cellular metal skeleton embedded in the body, the skeleton having multiple interconnected strands, some of the strands meeting at nodes, the strands and nodes defining multiple interconnected cells or pores, the skeleton having a pore density which may be measured in an x, y and z dimension, the z axis being the shortest axis and normal to the x and y axis and the first and second aircraft surfaces and defining a skeleton thickness, the skeleton having a relative density of less than about 25%.
2 . The gasket of claim 1 wherein the skeleton comprises regular-shaped cells.
3 . The gasket of claim 1 wherein the skeleton comprises irregular-shaped cells.
4 . The gasket of claim 1 wherein the skeleton has a pore density of between about 17 and 63 ppi.
5 . The gasket of claim 1 wherein the skeleton has a pore density of between about 50 and 150 ppi.
6 . The gasket of claim 1 wherein the skeleton has a pore density of between about 15 and 250 ppi.
7 . The gasket of claim 1 wherein the mass density of the skeleton is between about 0.3 and 0.6 gr/cc.
8 . The gasket of claim 1 wherein the skeleton has a thickness in the range of about 0.0125″ to about 0.50″.
9 . The gasket of claim 1 wherein the skeleton has a relative density of less than about 10%.
10 . The gasket of claim 1 wherein the skeleton requires greater than about 50 psi before there is about 20% or more of reduction to its original thickness.
11 . The gasket of claim 1 wherein the resistance of the skeleton measured in the z dimension is less than about 2.5 milliohms.
12 . The gasket of claim 1 wherein the strands and nodes of the skeleton are solid metal.
13 . The gasket of claim 1 wherein the strands and nodes of the skeleton are metal with a non-metallic core.
14 . The gasket of claim 1 wherein the body is a cured polyurethane gel.
15 . The gasket of claim 14 wherein the polyurethane has a cured hardness of between about 40 and 150 (cone penetration).
16 . The gasket of claim 15 wherein the cured body is tacky.
17 . The gasket of claim 1 , wherein the cellular skeleton is aluminum or aluminum alloy.
18 . The gasket of claim 17 , wherein the body is a cured polyurethane gel.
19 . The gasket of claim 1 , wherein the metal is nickel or nickel alloy.
20 . The gasket of claim 1 , wherein the metal is aluminum or aluminum alloy.
21 . The gasket of claim 1 , wherein cells have an average pore diameter in the range of about 0.01″ to 0.125″.
22 . A gasket for compressible placement between a first aircraft surface and a second aircraft surface, the gasket comprising:
a viscoelastic, pliable, deformable, tacky polymer body;
a cellular metal skeleton embedded in the body, the skeleton having multiple interconnected strands, some of the strands meeting at nodes, the strands and nodes defining multiple interconnected cells or pores, the skeleton having a pore density which may be measured in an x, y and z dimension, the z axis being the shortest and being normal to the x and y axis and the first and second aircraft surfaces and defining a skeleton thickness, the skeleton having a cell volume of greater than 75%.;
wherein the skeleton comprises irregular-shaped cells;
wherein the skeleton has a pore density of between about 17 and 63 ppi, wherein the pore density is substantially the same in the x, y and z dimensions;
wherein the skeleton has a relative density of less than 30%; and
wherein the strand and nodes of the skeleton are solid metal.
23 . The gasket of claim 22 , wherein the metal is nickel or nickel alloy.
24 . The gasket of claim 22 , wherein the metal is aluminum or aluminum alloy.
25 . A method of making a gasket for compressible placement between a first surface and a second surface, the method comprising the steps of:
providing an uncured polymer mix that will cure to a tacky, pliable gel;
providing a cellular metal skeleton, the skeleton having multiple interconnected strands, some of the strands meeting at nodes, the strands and nodes defining multiple interconnected cells or pores, the skeleton having a pore density which may be measured in an x, y and z dimension, the z axis being the shortest axis and normal to the x and y axis and the first and second surfaces and defining a skeleton thickness;
encapsulating the skeleton in the uncured polymer mix; and
allowing the polymer to cure.
26 . The method of claim 25 wherein the encapsulating step includes placing the skeleton and polymer mix in a mold until the gel cures, then removing it from the mold.
27 . The method of claim 25 wherein the encapsulating step is achieved by combining the mix with the skeleton without a mold.
28 . The method of claim 25 wherein the encapsulating step includes placing the skeleton and polymer mix in a mold and drawing a vacuum on the mold.
29 . The method of claim 25 wherein the encapsulating step includes allowing gravity to urge the mix into the skeleton.
30 . The method of claim 25 wherein the encapsulating step includes pressing the polymer mix into the skeleton.