Nanostructured Carbon Coatings
Abstract
This paper provides an overview of nanocrystalline and nanostructured carbon coatings and explores a very broad range of potentially important carbon nanostructures that may be used in future technologies. A new method for the synthesis of nanostructured carbon coatings on the surface of SiC and other metal carbides is described. This method is accomplished through the extraction of metals from carbides by supercritical water or halogens in a high temperature reactor. This is a versatile technology because a variety of carbon structures can be obtained on the surface of carbides in the same reactor. Not only simple shapes or fibers, but also powders, whiskers and components with complex shapes and surface morphologies can be coated. This technology allows for the control of coating growth on the atomic level, monolayer by monolayer, with high accuracy and controlled structures. Ordered and disordered graphite, nanoporous carbon (specific surface area of 1000 sq m/g and more) and hard carbon can be formed depending on the temperature and gas composition. These carbon coatings can be used as tribological coatings having a low friction coefficient for a variety of applications, from heavy-load bearings to nanocoatings for MEMS; protective coating for sensors and tools, intermediate thin films for further CVD deposition of diamond, weak coatings on SiC reinforcements for composite materials, coatings on SiC powders for improved sinterability, catalyst supports, molecular membranes for sensors, etc. The structure and properties of carbon coatings obtained on the surface of SiC have been investigated using an array of analytical techniques.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 2000
- Accession Number
- ADP011802
Entities
People
- Yury Gogotsi
Organizations
- University of Illinois at Chicago