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Method for Bonding of Elastomer Layers to Metal

IP.com Disclosure Number: IPCOM000243697D
Publication Date: 2015-Oct-13
Document File: 3 page(s) / 578K

Publishing Venue

The IP.com Prior Art Database

Abstract

We propose a mechanism to attach the elastomeric layer which forms the stator coating on the metal body by using mechanical anchors The anchors are carbon nanotubes which are grown on the metal surface the elastomer is then deposited spread on them resulting in the nanotubes being embedded in the elastomer The strong bond between the nanotube and metal and nanotube and elastomer creates a bond stronger than an adhesive The bonding strength comes from 1 Billions of anchor locations per square inch created by the nanotubes grown on the metal surface 2 Strong adhesion between nanotubes and metal sufficient to lift few 100 tons per square inch ref gekko research stanford 3 High surface area of the nanotubes allow multiple bonding locations with elastomer 10g nanotubes have surface area of a football field 4 The nanotubes are tangled curved fibers which allows for mechanical bonding between the nanotubes and elastomers and 5 Functionalization of the nanotubes can create a chemical bond between the nanotubes and elastomer We disclose a few processes used to make this bonding between the elastomer and metal layer The same method can also be used in places where a good bonding between the elastomer and metal is needed for example in pads which are in contact with formation they traditionally suffer from a problem related to hard polymers not sticking well to metal this method will get around that limitation The other application is in high temperature mud motors HT elastomers suitable for the motor applications do not stick well to the metal surface this method gets over the limitation by creating a mechanical adhesion method stronger than most chemical bonds

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Title:

Method for bonding of elastomer layers to metal

Abstract:

We propose a mechanism to attach the elastomeric layer which forms the stator coating on the metal body by using mechanical anchors. The anchors are carbon nanotubes which are grown on the metal surface, the elastomer is then deposited/spread on them resulting in the nanotubes being embedded in the elastomer. The strong bond between the nanotube and metal and nanotube and elastomer creates a bond stronger than an adhesive. The bonding strength comes from - 1. Billions of anchor locations per square inch created by the nanotubes grown on the metal surface, 2. Strong adhesion between nanotubes and metal - sufficient to lift few 100 tons per square inch (ref: gekko research@stanford), 3. High surface area of the nanotubes allow multiple bonding locations with elastomer (10g nanotubes have surface area of a football field), 4. The nanotubes are tangled, curved fibers which allows for mechanical bonding between the nanotubes and elastomers, and 5. Functionalization of the nanotubes can create a chemical bond between the nanotubes and elastomer. We disclose a few processes used to make this bonding between the elastomer and metal layer. The same method can also be used in places where a good bonding between the elastomer and metal is needed, for example in pads which are in contact with formation - they traditionally suffer from a problem related to hard polymers not sticking well to metal, this method will get around that limitation. The other application is in high-temperature mud motors, HT elastomers suitable for the motor applications do not stick well to the metal surface - this method gets over the limitation by creating a mechanical adhesion method stronger than most chemical bonds.

Description:

CNT = Carbon nanotubes

Process Steps


1. Grow CNT forest on the metal layer us...