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Home Material Sciences Electron Beam Technology And Equipment For Producing Carbon_Based Materials With An Amorphous, Nano And Micro-Sized Structure

Electron Beam Technology And Equipment For Producing Carbon_Based Materials With An Amorphous, Nano_And Micro_Sized Structure

Description

Technology is based on the method of electron beam evaporation of carbon (graphite) using a liquid pool of tungsten and subsequent condensation of the vapour flow, which was suggested by us and patented in Ukraine and the USA (US Patent #5296274, cl. B05D 1/00 Movchan B.A. and others. “Method of producing carbon-containing materials by electron beam vacuum evaporation of graphite and subsequent condensation”). Evaporation is performed as follows: a plano-cylindrical tungsten tablet 5 – 10 mm high is placed on the end face of a cylindrical graphite block of 50 – 100 mm diameter and specified length. The tablet is melted by the electron beam and forms a “hot pool”. A continuous transport process of carbon dissolution in the liquid pool volume, subsequent evaporation from the pool surface and formation of an intensive vapour flow of carbon atoms (clusters) is established. Tungsten practically does not evaporate.

Located near the above-mentioned carbon evaporation source is the second independent traditional source of electron beam evaporation of metallic and non-metallic materials, which are added to the main vapour flow of carbon by evaporation,

This method has been recently improved by applying the technique of reflection of the vapour flow of carbon (or carbon plus additives) from surfaces (mirrors) heated up to high temperatures (1000 – 1800°C), to form in space vapour flows of a specified orientation and more uniform in terms of composition, structure and energy of the particles. This improvement is required at subsequent deposition of the vapor flow and “engineering” of the specified coating structure.

Vapour flow ionization and bleeding gases into the vacuum chamber can be used as additional technological parameters for controlling the deposition process and condensate structure. Temperature of the deposition surface is one of the main technological parameters, controlling the condensate structure. Rate of evaporation of a graphite block of 70 mm diameter is equal to 1.0 – 1.1 kg/h.

Innovative Aspect and Main Advantages

Electron beam technology differs from the currently available methods of arc and laser evaporation of carbon by availability of many parameters for fine adjustment of the main stages of the evaporation process, vapour flow formation and its condensation, namely:
1. Area, average values of evaporation rate and temperature of atoms (molecules) evaporated from the tungsten “hot pool”.
2. Temperature, composition and molecular structure of the vapour flow after reflection from the heated surfaces, vapour flow ionization, bleeding gases and using additives of inorganic and organic substances, including catalysts of the growth of macromolecular structures of the type of nanotubes and fullerenes. Temperature of the condensation surface of an oriented vapour flow in the range from room temperature to 1000 - 1200°C and respective structures.
3. from amorphous to nano- and micro-sized.
Possibility of producing macromolecular (fullerenes, nanotubes) and diamondlike structures, carbides and composite materials (coatings) on their base is shown. A pilot production electron beam unit of up to 250 kW power adapted to the above technology variants is available.

Areas of Application

Electronics and optoelectronics, medicine, chemical technology, instrument and mechanical engineering.

a/

b/
Pic.1 Examples of special structures of carbon condensates: nanotubes (a) and spheres (b).

Stage of Development

Technology and equipment have been patented, experimental facilities are available, and a demonstration can be done.

Contact Details

Іnternational Center for Electron Beam Technologies of E.O.Paton Electric Welding Institute of NASU
68, Gorky str., Kiev-150, 03150, Ukraine
Kurapov Yuriy ; Yakovchuk Konstantin
Tel. +38 044 289-2176
Fax +38 044 287-3166
E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
http://www.paton-icebt.kiev.ua

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