Proje Geliştirme ve
Koordinasyon Birimi

2016-06-09 Bulgaria: Development and Research of Silicon Carbide Production Technology in Electrothermal Fluidized Bed


Development and Research of Silicon Carbide Production Technology in Electrothermal Fluidized Bed

Description of the project offered: 
Silicon carbide SiC has a wide range of unique physic-chemical properties that make it the perspective material for realization of design and technological concepts in different fields of state-of-the-art technology. Application scope of silicon carbide includes such advanced fields of modern technology as ceramic and polymeric composite materials, aviation and space technologies, nuclear industry, power cells, electronics, semiconductor engineering etc. These scientific challenges are the objects of periodic international and European conferences “International Conference on Silicon Carbide and Related Materials (ICSCRM)” and “ECSCRM”. 
The basic method of industrial production of silicon carbide, Acheson process, was developed at the end of ХІХ century. It is based on carbothermal reduction of silicon dioxide using quartz sand of special purity and petrol coke. Initial charge materials are held in large-capacity electric furnace for one day having the temperature of at least 1800 °С. Further processing of generated charge is quite difficult process that foresees a lot of manual work. The outcome of lump silicon carbine does not exceed 10-15 %, the production process demands in significant amount of energy and provides for increased ecological hazard. Lely method for silicon carbide production is more progressive variant of sublimation technology. It is based on evaporation of polycrystal silicon carbide under the temperature of 2500 – 2650 °С and further condensation of vapors to random nuclei. The limitation of this method is large amount of nuclei. It leads to excessive generation of small crystals and creation and formation of druses. 
Today, the demand in SiC small grain powder of high purity increases. Besides, such factors as energy saving, ecological safety and automation are of special importance in modern industry.
The main peculiarity of the proposed technology is the application of pyrocarbon as the reducing agent. This material was obtained from gas phase, it exhibits the high purity that leads to the improvement of purity of the final product. The process of obtaining of pyrocarboneous coating as well as the second stage of silicon carbide synthesis takes place in reactors with electrothermal fluidized bed. Using of such reactors allows creating high-reactive environment in fluidized bed of carbon particles, through which electric current passes. Due to electric microcharges, plasma zone appears and bonds openings in reacting substances take place. At the same time the temperature in reactor increases to 800 – 3000 °С. 
Gas Institute of the National Academy of Science of Ukraine has developed the technology of quartz sand encapsulation with pyrocarbon through pyrolysis of hydrocarbon gases in electrothermal fluidized bed. This is the unique technology, it ensures the maximal contact of “carbon – quartz sand” phases. It has made it possible to reduce energy and resources consumption of the second stage, as well as to produce silicon carbide of high purity.
Heat and Mass Transfer Institute of the National Academy of Science of The Republic of Belarus has developed the technology of finely-divided silicon carbide in electrothermal fluidized bed with different reducing agents (oil coke, charcoal, coal coke) and determined the most efficient process parameters and necessary mixture ratio. The influence of microcharges plasma and content of reducing agent on obtained silicon carbide was identified. 
Combination of this two processes will lead to development of new cost-efficient and ecologically friendly two-stage technology of silicon carbide production. Besides, as a result of research study, scientific and technological basis of technology of silicon carbide production will be created and new design of reactors with electrothermal fluidized bed will be developed. The other probable result is production of new materials with the improved physical and chemical properties.
Project proposer:   Serhii Kustovskyi ()
Partner role:  Project coordinator 
Partner organisation:  Consultancy
Call for proposal title:  N/A 

Description of the collaboration sought: 
"Green Rise Invest LLC", Bulgaria, together with Gas Instute of National Academy of Science of Ukraine and A.V. Luikov Heat and Mass Transfer Institute of the Republic of Belarus are pleased to propose the research project "Development and research of silicon carbide production technology in electrothermal fluidized bed".

We are looking for the EU organizations that can participate in industrial introduction of proposed technology and instrumental cross-checking of characteristics of obtained material. 
Expertise sought: Other technology, Materials technology, Industrial manufacture, 
Roles sought: Project participant, 
Organisation types sought: 
Countries sought: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, United Kingdom, Albania, Bosnia and Herzegovina, Croatia, Iceland, Israel, Liechtenstein, Macedonia, the former Yugoslav Republic of, Montenegro, Norway, Serbia, Switzerland, Turkey