Ceramic materials reinforced with single-wall carbon nanotubes as electrical conductors

Abstract

Composite materials formed of a matrix of fused ceramic grains with single-wall carbon nanotubes dispersed throughout the matrix and a high relative density, notably that achieved by electric field-assisted sintering, demonstrate unusually high electrical conductivity in combination with high-performance mechanical properties including high fracture toughness. This combination of electrical and mechanical properties makes these composites useful as electrical conductors in applications where high-performance materials are needed due to exposure to extreme conditions such as high temperatures and mechanical stresses.

Description

STATEMENT AS TO RIGHTS TO INVENTIONS MADE UNDER FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT [0001] This invention was made with Government under Contract No. G-DAAD 19-00-1-0185, awarded by the United States Army Research Office. The Government has certain rights in this invention.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] This invention resides in the field of electrically conductive ceramics, and incorporates technologies relating to nanocrystalline materials, carbon nanotubes, and sintering methods for densification and property enhancement of materials. [0004] 2. Description of the Prior Art [0005] The ability of ceramics to withstand extreme conditions of temperature, mechanical stress, and chemical exposure without failure or with a very low failure rate has led to the use of ceramics in applications that require high-performance materials, such as heat engines, cutting tools, wear and friction surfaces, and space vehicles. In recent years, the use of ...

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Benefits of technology

[0011] In the preferred embodiments of the invention that achieve densification by electric field-assisted sintering, the invention offers the further advantage of a reduction in processing time due to the speed with which electric field-assisted sintering can be performed relative to other sintering methods.

Problems solved by technology

An unfortunate characteristic of nanocrystalline ceramics is brittleness.

The best conductivity however was only obtainable in the center of the extrusion since the carbon nanotubes in other parts of the composite had been damaged during the extrusion.

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