Possibilities of matrix lead alloy doping at non-gasostatic carbon-graphite impregnation
https://doi.org/10.17073/1997-308X-2021-2-41-48
Abstract
The study covers the process of carbon-graphite – lead composite formation by impregnating a porous AG-1500 scaffold with a lead melt containing 2.0 at.% Cu. The paper describes the kinetics of filling the carbon-graphite open porosity with molten metal with the continuously heated furnace and impregnating device. A feature of this method is the volumetric expansion of the lead alloy impregnating porous carbon-graphite. It is placed in a sealed steel container filled with lead by 2/3 of its volume with further vacuuming, melt adding and sealing. Then the device is placed in the furnace so that the lead-copper alloy, already having a temperature below the liquidus temperature by 20–30 °C when heated in the furnace to 900 °C, impregnates the carbon-graphite scaffold with further expansion at constant heating. Porous scaffold capillaries are filled as the melt temperature continuously increases. Once graphite-carbon impregnated with lead alloy is taken out, it was investigated using X-ray spectral and energy-dispersive analysis. It was found that the elements of the impregnating alloy were redistributed at the carbon-graphite scaffold/Pb alloy interface depending on its initial composition. During the carbon-graphite scaffold impregnation with the Pb–2%Сu alloy under a pressure of up to 5 MPa, copper redistribution occurs on its inner pore surface and the boundary with the alloy, which leads to the formation of an interphase layer containing 70 % Cu. The conducted research made it possible to obtain a composite with a copper content of 1.85 at.% in the impregnating Pb alloy at the interface with carbon graphite.
About the Author
V. A. Gulevsky
Volgograd State Technical University
Russian Federation
Russian Federation
Cand. Sci. (Eng.), Associate professor, Department of foundry machinery and technology
400005, Russia, Volgograd, Lenina ave., 28)
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Review
For citations:
Gulevsky V.A. Possibilities of matrix lead alloy doping at non-gasostatic carbon-graphite impregnation. Powder Metallurgy аnd Functional Coatings (Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional'nye Pokrytiya). 2021;(2):41-48. (In Russ.) https://doi.org/10.17073/1997-308X-2021-2-41-48
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