Fraunhofer IST
 Fraunhofer-Gesellschaft
Fraunhofer Institute for Surface Engineering and Thin Films IST
 
Coating types    
 
CVD diamond films
  Artificial diamonds can be made not only by high-pressure, high-temperature synthesis but also by so-called low-pressure synthesis. Their material properties are almost identical to those of the natural diamond.
 

Atomic structure of diamond.


CVD diamond film: preparation of a fracture surface.
  Only the CVD method can be used as a vacuum deposition method. Here the diamond is deposited directly as a coating by using a gas containing carbon and building up carbon atoms in diamond crystallite form on the surface of the substrate.

The CVD diamond thus produced is used either as a thin film on the substrate or can however also be deposited as a thick film with coating thicknesses up to two millimeters. It is then detached from the substrate, further processed and used as self-supporting CVD diamond.

VDI guideline 2840 distinguishes the following types of CVD diamond:
  • Nanocrystalline CVD diamond film
  • Microcrystalline CVD diamond film
  • Doped CVD diamond film
  • CVD diamond
  • Doped CVD diamond.
Due to its many extreme properties, CVD diamond has a very wide and varied range of applications. When doped with foreign atoms, an electrically conductive version can also be produced. Applications include:
  • Wear protection - for example for cutting tools
  • Corrosion protection against all chemical substances
  • Friction reduction with a high degree of wear protection - for example, for seals and other paired sliding components
  • Coating electrodes for electrochemical processes - for example, for wastewater cleaning
  • Heat spreaders for high-power electronics
  • Windows for high intensities of radiation - for example, for x-ray applications
  • Acoustic components - for example, tweeters
  • Decorative applications - for example, jewelry, wristwatches.
A bibliography for further reading is provided here.
 
 
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