Technology of Diamond Coating and “Cold Incineration”

Conductive Diamond Layers

Chemical Vapour Deposition, CVD

Conductive diamond layers are produced in an activated gas phase. During this process called Chemical Vapour Deposition (CVD) the gas phase consisting of hydrogen, added methane – for the production of diamond – and a gaseous boron compound is activated by hot filaments (HF).

After a special pre-treatment the electrode substrates are exposed to this gas phase. If substrate temperatures between 600°C and 900°C and suitable acitivation conditions are maintained coherent, polycrystallinge diamond layers are formed on the electrode surface. During the coating process boron is added into the diamond layer.

By adding different amounts of boron the conductivity of HFCVD diamond layers can be adjusted to different applications as DIACHEM® electrodes.

EAOP® – Electrochemical Advanced Oxidation Process

The unique property of diamond electrodes is the production of oxidants directly from the water. This is the basis of the Electrochemical Advanced Oxidation Process (EAOP®).

EAOP® is a very effective addition to common treatment methods and an environmentally friendly process for reducing organic pollutants in water.

The Electrochemical Advanced Oxidation Process EAOP® produces highly oxidative hydroxyl radicals OH* by current-controlled electrolysis in aqueous solutions.

The redox potential is 2,8 eV. Solutions for different applications can be provided by process control.

Examples for EAOP® applications:

  • Mass transport limited, complete oxidation of organic compounds using hydroxyl radicals
  • Oxidation of organic compounds in a volume using secondary redox systems (e.g. sulphate – persulphate)
  • Chlorine-free, oxygen-based disinfection using hydroxyl radicals, hydrogen peroxide or ozone depending on the operating conditions