METHOD FOR INCREASING THE ADHESION STRENGTH OF A POLYMER
A process for improving the adhesion of polymers to metal surfaces includes a highly porous layer that is condensed onto a metal substrate to provide a strong bond between the metal substrate and the highly porous layer. A polymer adhesive is deposited on top of the highly porous layer, where the polymer adhesive bonds to the pores that exist in the highly porous layer, improving the adhesion of the polymer adhesive to the metal substrate.
1 . A method for adhering a polymer adhesive layer to a metallic substrate, comprising the steps of:
condensing a layer of highly porous material on at least a portion of the metallic substrate; and
depositing the polymer adhesive layer on top of the highly porous layer.
2 . The method of claim 1 , wherein the condensing step comprises a physical vapor deposition condensation process.
3 . The method of claim 2 , wherein the physical vapor deposition condensation process is a bi-modal process including radio frequency enhanced physical vapor deposition or laser assisted physical vapor deposition.
4 . The method of claim 1 , wherein the highly porous material comprises a biocompatible material.
5 . The method of claim 4 , wherein the biocompatible material is selected from the group consisting of platinum, titanium, tantalum, palladium, zirconium, and diamond like carbon.
6 . The method of claim 1 , wherein the highly porous layer comprises a distribution of both mesopores and macropores.
7 . The method of claim 6 , wherein the mesopores and macropores have diameters ranging from 1 micron to 20 nanometers.
8 . The method of claim 6 , wherein the distribution of mesopores and macropores results in a highly porous layer having an open volume greater than 20% but less than 80% of the total volume of the material.
9 . The method of claim 1 , wherein the condensing step further comprises the step of introducing an additive for the active removal of high energy nuclei sites during the condensing process.
10 . A method for adhering a polymer adhesive layer to a metallic substrate, comprising the steps of:
condensing a layer of highly porous material on at least a portion of the metallic substrate by a physical vapor deposition process, such that the highly porous layer comprises a distribution of both mesopores and macropores; and
depositing the polymer adhesive layer on top of the highly porous layer.
11 . The method of claim 10 , wherein the physical vapor deposition condensation process is a bi-modal process including radio frequency enhanced physical vapor deposition or laser assisted physical vapor deposition.
12 . The method of claim 10 , wherein the highly porous material comprises a biocompatible material.
13 . The method of claim 4 , wherein the biocompatible material is selected from the group consisting of platinum, titanium, tantalum, palladium, zirconium, and diamond like carbon.
14 . The method of claim 10 , wherein the mesopores and macropores have diameters ranging from 1 micron to 20 nanometers and the distribution of mesopores and macropores results in a highly porous layer having an open volume greater than 20% but less than 80% of the total volume of the material.
15 . The method of claim 10 , wherein the condensing step further comprises the step of introducing an additive for the active removal of high energy nuclei sites during the physical vapor deposition process.
16 . A method for adhering a polymer adhesive layer to a metallic substrate, comprising the steps of:
condensing a layer of highly porous material on at least a portion of the metallic substrate, such that the highly porous layer comprises a distribution of both mesopores and macropores;
introducing an additive to the highly porous material during the condensing step for the active removal of high energy nuclei sites during the condensing process; and
depositing the polymer adhesive layer on top of the highly porous layer.
17 . The method of claim 16 , wherein the condensing step comprises a bi-modal physical vapor deposition condensation process including radio frequency enhanced physical vapor deposition or laser assisted physical vapor deposition.
18 . The method of claim 16 , wherein the highly porous material comprises a biocompatible material selected from the group consisting of platinum, titanium, tantalum, palladium, zirconium, and diamond like carbon.
19 . The method of claim 16 , wherein the mesopores and macropores have diameters ranging from 1 micron to 20 nanometers.
20 . The method of claim 16 , wherein the distribution of mesopores and macropores results in a highly porous layer having an open volume greater than 20% but less than 80% of the total volume of the material.