NANOPOROUS PRODUCTS FROM PURE OXIDES

1 STEPNOV Alexey
Co-authors:
2 PAVLOV Artem 3 BELYAEV Igor 3 KIREEV Andrei 3 PRUSOV Evgeny
Institutions:
1 Research and Production Enterprise “Center for Plasma Spraying” LLC, Vladimir, Russian Federation
2 Research and Production Association “Magneton”, Vladimir, Russian Federation
3 Vladimir State University, Vladimir, Russian Federation
Conference:
26th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 24th - 26th 2017
Proceedings:
Proceedings 26th International Conference on Metallurgy and Materials
Pages:
684-687
ISBN:
978-80-87294-79-6
ISSN:
2694-9296
Published:
9th January 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
25 views / 7 downloads
Abstract

Nanoporous ceramic products from pure aluminum oxide were fabricated by plasma spraying method. The deposition process consists of passing of sprayed material particles with high velocity through plasma flow and subsequent coating of these particles on the surface of rotating metal forming mandrel. The products manufactured by standard techniques of plasma spraying have low thermal conductivity and selectively high gas permeability. The material of these products has a heterogeneous phase composition which is formed during the high speed cycle of heating and cooling when aluminum oxide particles passing through a stream of air plasma. Aluminum oxide particles in the composition of the material of products are in the alpha state and also in the beta- and gamma states. Reduction in porosity of products to nanoscale values (100-250 nm) and translation of material of plasma sprayed oxide product into single-phase alpha-state leads to a sharp increase in its thermal conductivity. By varying the sintering modes it is possible to fabricate nanoporous products with desired values of thermal conductivity. Products from this material may be efficiently used in special electrometallurgy as containers for growing single crystals, in chemical industry, in mechanical engineering, instrumentation and special equipment, as well as in medicine and biotechnology.

Keywords: nanoporous ceramics, aluminum oxide, plasma spraying
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