RT Journal Article
T1 Improvement of wear resistance of low-cost powder metallurgy beta-titanium alloys for biomedical applications
A1 Chirico, C.
A1 Vaz-Romero, Álvaro
A1 Gordo Odériz, Elena
A1 Tsipas, Sophia Alexandra
AB Low wear resistance and the relative high Young's modulus reduce the lifetime of the current biomedical Ti alloys for orthopaedic applications. In this study, two novel low-cost beta-Ti alloys (Ti-5Fe-25Nb and Tisingle bond40Nb in wt%), with reduced elastic modulus, are produced by powder metallurgy route, starting from TiH2 powder. In order to increase their wear resistance, two strategies are proposed: 1) addition of 5 vol% of TiN reinforcement particles and 2) gas nitriding surface treatment to produce a TiN coating. Wear resistance was evaluated by dry sliding reciprocating wear tests against alumina as counter material. Dry sliding tests were performed under unlubricated conditions, applying 10 N and 20 N load. Gas nitrided samples exhibit higher hardness than base alloys, while maintaining low elastic modulus. Both modification techniques improve wear resistance. The highest wear reduction was obtained for gas nitrided samples, reaching a wear rate reduction between 86% and 43%, compared to untreated alloys at 10 N, and between 4% to 15% at 20 N.
PB Elsevier
SN 0257-8972
YR 2022
FD 2022-03-25
LK https://hdl.handle.net/10016/37977
UL https://hdl.handle.net/10016/37977
LA eng
NO This work was supported by the Ministry of Economy and Competitiveness of Spain (programme MINECO, ref. PCIN-2016-123 project BIOHYB, and the Regional Government of Madrid (programme ADITIMAT-CM, ref. S2018/NMT-4411).
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RD 30 jun. 2024