Authors & Affiliations

Martynov P.N., Askhadullin R.Sh., Osipov A.A.
A.I. Leypunsky Institute for Physics and Power, Obninsk, Russia

Abstract

This paper presents the results of the synthesis technology of aluminum oxyhydroxides ultraporous Al2O3*n(H2O) (aerogel AlOOH) managed by the selective oxidation of binary liquid metal melts Ga-Al and Bi-Al. The prospects of creating a liquid metal technology of nanomaterials synthesis of a wide range, which is managed by the selective oxidation of metal dissolved in an inert with respect to the oxidant used liquid metal media. The results of studies of the aerogel AlOOH properties are presented . Based on microstructural studies revealed that the aerogel has a stable fibrous nanostructure with "stretching" anisotropy , the fiber diameter of from 5 to 15 nm. Results of studies on thermal properties of the aerogel and its elemental composition are presented. It has been determined that aerogel has low thermal conductivity (~ 0.02-0.03 W/(m·K) within rather wide temperature range, namely: 130-1500 K. Studies on using small additives of AlOOH aerogel (0.5-5 wt.%) to ceramic materials based on silicon nitride Si3N4, silicon carbide SiC, and zirconium dioxide ZrO2 showed that aerogel additive made it possible to increase physical and mechanical characteristics of ceramics by 20-30% at the average.

Keywords
Aerogel, nanostructures, liquid metals, gallium, bismuth, aluminium, ceramics, zirconium dioxide, silicon nitride, silicon carbide

Article Text (PDF)

References

UDC 54.057:621.039.5

Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants, 2015, issue 4, 4:3