Graphite contact phenomena developing in interaction with rare earth elements doped aluminum alloys studying.

DOI

10.2991/ismems-17.2018.14How to use a DOI?

Keywords

Aluminum melts; graphite; interaction; wetting contact angle

Abstract

Based on equilibrium in Al-REE and C-REE systems data, possibility of improvement carbon surface wetting with aluminum melt by their alloying with REE assumption is made. Aluminum melts MPG-6 graphite substrate flat surface wetting contact angle over time change data is presented. The experiments were carried out in a vacuum of 10-2 Pa at temperatures up to 1100 øC. Melts of Al-10 wt% Ce, La, Nd, Sm; Al -3 wt% Y; Al-2.5 wt% Cu- 3 wt% Ti and pure aluminum are used. It is shown that up to 1000 ø C wetting of the graphite surface by aluminum melts of these compositions does not occur, while the wetting angle is established in the first seconds and practically does not change with time. Above 1000 øC, wetting is improved, with the wetting contact angle of Al / 10 wt% Ce and Al / 10 wt% Sm being set in the first seconds and does not change thereafter, and in case of other melts decreases with time. It is most convenient at 1100 øC that the graphite surface is wetted with Al-10 wt% La, Al-3 wt% Y and Al-2.5 wt% Cu-3 wt% Ti melts. Aluminum melt and graphite substrate interface structure change data is presented. It is shown that in the interval from 1000 to 1100 øC interaction between melt and graphite intensifies, there is no significant dissolution of the graphite surface and aluminum carbide is formed. Melts Al / 10 wt% Sm and Al-2.5 wt% Cu- 3 wt% Ti interact most active. It is concluded that the activity of the diffusion interaction, in particular the formation of aluminum carbide, is not directly related to the value of the contact angle of wetting. By calculating the Gibbs energy of alumina with REE and Y interaction, it is shown that the reaction can take place in direction of alumina to the metallic state by all elements reduction. The alloying elements used in experiments actually exert various impacts on a superficial tension and properties of an oxide film on the melt surfaces. The most actively superficial tension is changed by elements Y, Ti, Sm. Ti and Sm promote active formation of carbide of Al4C3 aluminum. Lanthanum, obviously, influences a superficial tension a little, but promotes destruction of an oxide film that improves contact with a substrate.

Copyright

© 2018, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - A. V. Panichkin
AU  - B. K. Kenzhaliyev
AU  - B. B. Kshibekova
AU  - Zh. Alibekov
AU  - A. T. Imbarova
PY  - 2017/11
DA  - 2017/11
TI  - Graphite contact phenomena developing in interaction with rare earth elements doped aluminum alloys studying.
BT  - Proceedings of the International Symposium on Mechanical Engineering and Material Science (ISMEMS 2017)
PB  - Atlantis Press
SP  - 60
EP  - 64
SN  - 2352-5401
UR  - https://doi.org/10.2991/ismems-17.2018.14
DO  - 10.2991/ismems-17.2018.14
ID  - Panichkin2017/11
ER  -