Patent ID: 8530052

Claim:
A carbon nanotube composite preform, comprising: a substrate; a carbon nanotube array formed on the substrate, wherein the carbon nanotube array comprises a plurality of carbon nanotube bundles, each of the plurality of carbon nanotube bundles comprises a first end and a second end opposite to the first end; the first end of each of the plurality of carbon nanotube bundles is attached to the substrate, and the second end of each of the plurality of carbon nanotube bundles extends away from the substrate; a first gap between adjacent two of the first ends is smaller than a second gap between adjacent two of the second ends, the plurality of carbon nanotube bundles forms one carbon nanotube layer; each of the plurality of carbon nanotube bundles comprises a plurality of carbon nanotubes, and each of the plurality of carbon nanotubes comprises a third end and a fourth end opposite to the third end; the third end of each of the carbon nanotubes is attached to the substrate, and the fourth end of each of the carbon nanotubes extends away from the substrate, and a third gap between adjacent two of the third ends is greater than a fourth gap between adjacent two of the fourth ends.