Nanocomposites and nanomaterials

The effect of heat treatment on properties of SiC prepared from plant residue
T.V. Tkachenko1, V.A. Yevdokymenko1, D.S. Kamenskyh1, M.M. Filonenko2, D.V. Molody1, V.A. Povazhny1, V.V. Vakhrin3, V.I. Kashkovsky1
1 Institute of Bioorganic Chemistry and Petrochemistry of the NAS of Ukraine, Murmanskaya str, 1, Kyiv-94, 02094, Ukraine.
E-mail: ttv13ttv@gmail.com 

2 National Pedagogical Dragomanov University, Pyrogova str., 9, Kyiv, 01601, Ukraine.

3 LLC «Polycrystal», Prof. Podvysots’kogo str., 10/10, office 60, Kyiv, 01103, Ukraine.

Silicon carbide due to unique physical-chemical properties (thermal and chemical stability, oxidation and corrosion resistance, high hardness, radioimmunity) used to produce oxygen free ceramics, semiconductors, Schottky diodes, UV sensors, covering of the spaceship hull and for the fusion reactor wall. Dependent on the way and obtaining condition some properties of the silicon carbide were changed. 
The aim of our work was the investigation of heat treatment on the silicon carbide obtaining.
Silicon carbide from the rice husk by two-stage synthesis was obtained. On the first stage, the high purity amorphous silicon dioxide was produced [1]. Then from the obtained SiО2 and activated carbon different purity carbides were synthesised by direct carbothermal synthesis during 1 hour at 1400-1900 оС and fast heating.
The synthesised SiC were analysed for morphology and composition using different methods: low-temperature nitrogen sorption-desorption, X-ray diffraction, FTIR, SEM, EDXRF.
It was established that obtained samples had the specific surface area from 1,8 to 11,5 m2/g and pore size 3,3-20,1 nm. FTIR, EDXRF та X-ray diffraction indicated that samples synthesised at temperature 1600 оС and higher contain only SiC.

1.	Yevdokymenko V.A., Kamenskyh D.S., Kashkovsky V.I., Vakhrin V.V. Method of producing amorphous silicon dioxide from th rice husk. // Pat. UA 123656. Publ. 12.03.2018. 5p.