Al Oxide Aerogel Production
Physico-Chemical Bases of Aluminium Oxide Aerogel Synthesis and Development of Continuous Technology for its Production from a Ga-Al Liquid Metal System
Tech Area / Field
8 Project completed
Senior Project Manager
Karabashev S G
FEI (IPPE), Russia, Kaluga reg., Obninsk
- Forschungszentrum Karlsruhe Technik und Umwelt / Institut für Neutronenphysik und Reaktortechnik, Germany, Karlsruhe\nSandia National Laboratories, USA, NM, Albuquerque
Project summaryThe objective of ibis work is to develop continuous technology for obtaining aluminum oxide aerogels from gallium-aluminum melt. This technology will be created by developments within the project proposed creation of laboratory installation with continuous Al supply to gallium, and selective oxidation of aluminum until obtaining aerogels.
Principal objectives are as follows.
- develop a principal scheme of continuous process technology for aluminum oxide aerogels production from gallium - aluminum melts;
- study physic-chemical regularities of the process of selective oxidation of aluminum from gallium - aluminum melt;
- study the main properties of materials produced (microstructure, sorption, thermal and electrical insulating ones, etc.).
Technical approach and methodology
The main peculiar feature of the laboratory installation for continuous aerogel synthesis is the principle of liquid metal circulation loop. One of its bypasses is used for monitored dissolution of aluminum, and in the other (which is a reservoir with metallic gallium with additional supply of aluminum) the process of selective Al oxidation is effected, aerogels being formed at the gas-metal interface. The installation must be fabricated from material inert to gallium up to 200°C, tight, equipped with gas-vacuum system, heaters and devices for monitoring temperature and composition of gas at the inlet and outlet.
In the course of experimental perfection of aerogel synthesis technology, variations are tried in temperature parameters of aluminum dissolution, oxidation process, and composition of gaseous oxidizer, the objective being to optimize the modes.
The project proposed is an initial stage of developing the technology of continuous synthesis of aerogels from gallium-aluminum melt using laboratory facility.
The project is to result in the fabrication of continuous technological process laboratory facility, study of Al selective oxidation mechanism, and recommendations for the creation of pilot facility. In parallel, research works are planned on fundamental problems of metal oxidation and dissolving, defining mechanisms of chemical reactions, and defining the boundary conditions of aerogel formation.
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