Book chapter
Nanostructured Carbon Coatings on Silicon Carbide: Experimental and Theoretical Study
Functional Gradient Materials and Surface Layers Prepared by Fine Particles Technology, pp 239-255
2001
Abstract
Nanotechnology has been recognized as an emerging technology of the new century. Control over the structure of materials on nanoscale can open opportunities for the development of nanostructured materials with controlled properties, if the structure/property relations are known. This paper describes a technique that can produce a broad range of potentially important carbon nanostructures that may be used in future technologies. Nanostructured carbon coatings can be obtained either by deposition from the gas phase onto a substrate, or by surface treatment of a carbon-containing substrate. The method presented in this paper is accomplished through the extraction of metals from carbides (SiC and TiC) using chlorine or chlorine-hydrogen mixtures. 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, but also fibers, powders and components with complex shapes and surface morphologies can be coated. This technology allows the control of coating growth on the atomic level, monolayer by monolayer, with high accuracy and controlled structures.
In this work, the structure and properties of carbon coatings obtained in the surface of carbides have been investigated using transmission electron microscopy (TEM). Molecular dynamics was used to model the growth of carbon coatings on SiC and the simulation data are compared with TEM results. The simulation can provide guidance to understand the growth mechanism and potentially possible carbon structures. Ordered and disordered graphite, nanoporous carbon (specific surface area of>1000 m2/g) and hard carbons films can be formed SiC surfaces 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 micro-electro-mechanical systems (MEMS); protective coating for sensors and tools, intermediate thin films for further chemical vapor deposition (CVD) deposition of diamonds, weak coatings on SiC reinforcements for composite materials, coatings on SiC powders for improved sinterability, catalyst supports, and molecular membranes.
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Details
- Title
- Nanostructured Carbon Coatings on Silicon Carbide: Experimental and Theoretical Study
- Creators
- Yury GogotsiValentin KamyshenkoVladimir ShevchenkoSascha WelzDaniel A ErsoyMichael J McNallan
- Publication Details
- Functional Gradient Materials and Surface Layers Prepared by Fine Particles Technology, pp 239-255
- Series
- NATO Science Series
- Publisher
- Springer Netherlands; Dordrecht
- Resource Type
- Book chapter
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Other Identifier
- 991014969891404721