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Development of Ti PVD Films to Limit the Carburization of Metal Powders during SPS Process

Article dans une revue avec comité de lecture
Author
ARDIGO-BESNARD, Maria-Rosa
496957 Laboratoire Interdisciplinaire Carnot de Bourgogne [ICB]
BESNARD, Aurélien
127742 Laboratoire Bourguignon des Matériaux et Procédés [LABOMAP]
MOSER, Mathias
496957 Laboratoire Interdisciplinaire Carnot de Bourgogne [ICB]
BUSSIÈRE, Florian
496957 Laboratoire Interdisciplinaire Carnot de Bourgogne [ICB]

URI
http://hdl.handle.net/10985/21326
DOI
10.3390/solids2040025
Date
2021
Journal
Solids

Abstract

Spark plasma sintering technique is used for the fabrication of dense materials with a fine-grained microstructure. In this process, a powder is placed into a graphite mold and a uniaxial pressure is applied by two graphite punches. A graphite foil is inserted between the punches and the powder and between the mold and the powder to ensure good electrical, physical and thermal contact. One of the major drawbacks during sintering of metal powders is the carburization of the powder in contact with the graphite foils. In this study, a PVD coating of titanium was applied on the graphite foils in contact with the metal powder (pure iron). The results are promising, as the investigations show that the application of a Ti PVD film of 1.5 and 1.1 µm thickness is effective to completely avoid the carburization of iron powder. Carbon diffuses inside the PVD film during sintering. In parallel, iron diffusion was revealed inside the Ti coating of 1.5 µm thickness. On the other hand, a Ti PVD film of 0.5 µm thickness provides a protection against carbon diffusion just on the sides in contact with the mold, proving that the coating thickness represents an important parameter to consider.

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