Nanotube-containing composite bodies, and methods for making same

a composite body and nanotube technology, applied in the field of nanotube-containing composite materials, can solve the problems of insufficient durability of low expansion polymer composite materials, deficiency of glasses, and difficult processing, and achieve the effect of maintaining other mechanical properties such as modulus and flexural strength and enhancing properties

Inactive Publication Date: 2006-03-23
KARANDIKAR PRASHANT G
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0042] Using the processing methods of this invention, a Si/SiC/CNT composite was obtained with a fracture toughness that was 50% higher than the baseline Si/SiC, while maintaining the other mechanical properties such as modulus and flexural strength. The exist...

Problems solved by technology

Processing was difficult, however, as the metals either tended not to wet the carbon fibers, or reacted with the carbon.
As mentioned above, glass matrix composites have been used in environments where low expansion polymer composites would be insufficiently durable.
Many of these applications, however, require high thermal conductivity, and most glasses are deficient in this area.
Another problem with glass matrix composites, though, is that they tend to be brittle.
Curiously, when the nanotube is a carbon nanotube, the matrix cannot be silicon carbide.
So far, the work on composite materials featuring carbon nanotube reinforcement...

Method used

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  • Nanotube-containing composite bodies, and methods for making same
  • Nanotube-containing composite bodies, and methods for making same
  • Nanotube-containing composite bodies, and methods for making same

Examples

Experimental program
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Effect test

example i

[0079] This Example, demonstrates, among other things, the successful incorporation of carbon nanotubes (CNTs) into a metal-ceramic composite material and in particular, the survivability of the CNTs during infiltration processing with the metal in a molten condition.

[0080] About 3.86 g of chemical vapor deposition (CVD) grown multi wall carbon nanotubes (Iljin Nanotech Co. Ltd., Seoul, Korea) were mixed with about 42.64 g of phenolic (SC1008 from Borden Chemical Inc., Louisville, Ky.) to make a mixture. The CNTs diameter ranged from about 10-50 nm.

[0081] The mixture was poured in a rubber mold with a cavity measuring about 5 by 5 by 1.3 cm. The rubber mold was placed on a vibrating table for about 12 hours. A thin TEFLON® sheet measuring about 5 cm square was placed on the mixture in the mold. A graphite block measuring about 5 by 5 by 2.5 cm (and having a mass of about 225 g) was placed on top of the TEFLON® sheet. The mold was then placed in a curing oven and heated to about 14...

example ii

[0086] This Example, demonstrates, among other things, the successful incorporation of carbon nanotubes (CNTs) into a metal-ceramic composite material also containing another filler or reinforcement material.

[0087] About 50 g of SiC powders consisting of a 70:30 weight ratio of 240 and 500 grit particulates (Saint Gobain / Norton Industrial Ceramics, Worcester, Mass.), 2 g CNTs, about 20.93 g phenolic and about 15.6 g THF (solvent) were hand mixed in a beaker to make a mixture. The mixture was poured in a rubber mold with a cavity measuring about 5 by 5 by 1.3 cm. The rubber mold was placed on a vibrating table for about 12 hours. A thin TEFLON® sheet measuring about 5 cm square was placed on the mixture. A graphite block measuring about 5 by 5 by 2.5 cm was placed on top of the TEFLON® sheet. The mold was then placed in a curing oven and heated to about 140° C. for about 3 hours and then cooled to room temperature. A cured, stand-alone preform was produced after demolding. This pref...

example iii

[0095] Examples III and IV through X demonstrate, among other things, various methods for blending and distributing carbon nanotubes throughout a mass of preform material.

[0096] To a plastic jar were added a 100 g mixture of 240 and 500-600 grit SiC (Saint Gobain Ceramics and Plastics, Inc. Worcester, Mass.) in a 60:40 weight ratio, about 5 g of CVD grown multi-walled carbon nanotubes (Iljin Nanotech, Soeul, South Korea), about 15.25 g of phenolic (SC1008 from Borden Chemical Inc., Louisville, Ky.), and about 40 g of Reagent Alcohol. The jar was sealed and placed on a rolling mill.

[0097] After roll mixing for about 12 hours, the mixture was poured out of the jar and into a rubber mold of nominal cavity size about 71 mm square by about 13 mm deep. The rubber mold was placed on a vibrating table for about 18 hours, during which time, the excess liquid pooled at the top, and it was periodically removed. The mold was placed in an oven and the temperature was raised to about 140° C. at...

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Abstract

A composite material featuring comminuted or otherwise well dispersed and separated nanotubes reinforcing a matrix featuring metal, ceramic and/or polymer. In a preferred embodiment, the nanotubes feature elemental carbon, and the composites can be produced using a molten silicon metal infiltration technique, which may be pressurized or not, for example, a siliconizing or a reaction-bonding process. In this preferred embodiment, carbon nanotubes may be prevented from chemically reacting with the silicon infiltrant by an interfacial coating disposed between the carbon nanotubes and the infiltrant. A reaction-bonded composite body containing even a small percentage of carbon nanotubes possessed a significant increase in electrical conductivity as compared to a reaction-bonded composite not containing such nanotubes, reflecting the high electrical conductivity of the nanotubes. When the nanotubes are well dispersed throughout the preform, mechanical property enhancements start to become noticeable, such as fracture toughness enhancement.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This is a Continuation-in-Part of Commonly Owned U.S. patent application Ser. No. 10 / 832,823, filed on Apr. 26, 2004. The entire contents of this commonly owned patent application are expressly incorporated herein by reference.STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT [0002] This invention was made with Government support under Contract No. FA9453-04-M-0255 awarded by the U.S. Air Force Research Laboratory. The Government has certain rights in the invention.BACKGROUND OF THE INVENTION [0003] 1. Field of the Invention [0004] The present invention relates to metal and / or ceramic containing composite materials featuring a particular kind of fibrous reinforcement. In particular, the invention relates to composites having a matrix featuring metal, ceramic and / or polymer, and being reinforced with nanotubes, and preferably carbon nanotubes. [0005] 2. Discussion of Related Art [0006] It has been known for a long time to a...

Claims

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Application Information

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IPC IPC(8): D04H13/00
CPCB82Y30/00C22C2026/002C04B35/563C04B35/565C04B35/573C04B35/58071C04B35/584C04B35/6261C04B35/62863C04B35/62873C04B35/803C04B35/806C04B35/83C04B2235/3217C04B2235/3813C04B2235/3821C04B2235/3826C04B2235/3873C04B2235/402C04B2235/422C04B2235/428C04B2235/48C04B2235/5244C04B2235/5248C04B2235/5264C04B2235/5284C04B2235/5288C04B2235/5472C04B2235/604C04B2235/616C04B2235/77C04B2235/80C04B2235/96C22C26/00C04B35/117C04B35/80Y10T428/249924
Inventor KARANDIKAR, PRASHANT G.
Owner KARANDIKAR PRASHANT G
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