Spinel oxide enables high-temperature self-lubrication in superalloys.

Autor: Zhang Z; Department of Materials Science and Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA., Hershkovitz E; Department of Materials Science and Engineering, University of Florida, Gainesville, FL, USA., An Q; Department of Materials Science and Engineering, Iowa State University, Ames, IA, USA., Liu L; Department of Chemical Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA., Wang X; Department of Applied Engineering, Jacksonville State University, Jacksonville, AL, USA., Deng Z; Department of Mechanical Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA., Baucom G; Department of Materials Science and Engineering, University of Florida, Gainesville, FL, USA., Wang W; Department of Materials Science and Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA., Zhao J; Department of Geosciences, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA., Xin Z; Department of Materials Science and Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA., Moore L; Department of Geosciences, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA., Yao Y; School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ, USA., Islam MRU; Department of Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln, NE, USA., Chen X; Department of Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln, NE, USA., Cui B; Department of Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln, NE, USA., Li L; Department of Mechanical Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA., Xin H; Department of Chemical Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA., Li L; School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ, USA. lin.li.10@asu.edu., Kim H; Department of Materials Science and Engineering, University of Florida, Gainesville, FL, USA. honggyukim@ufl.edu., Cai W; Department of Materials Science and Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA. caiw@vt.edu.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2024 Nov 20; Vol. 15 (1), pp. 10039. Date of Electronic Publication: 2024 Nov 20.
DOI: 10.1038/s41467-024-54482-w
Abstrakt: The ability to lubricate and resist wear at temperatures above 600 °C in an oxidative environment remains a significant challenge for metals due to their high-temperature softening, oxidation, and rapid degradation of traditional solid lubricants. Herein, we demonstrate that high-temperature lubricity can be achieved with coefficients of friction (COF) as low as 0.10-0.32 at 600-900 °C by tailoring surface oxidation in additively-manufactured Inconel superalloy. By integrating high-temperature tribological testing, advanced materials characterization, and computations, we show that the formation of spinel-based oxide layers on superalloy promotes sustained self-lubrication due to their lower shear strength and more negative formation and cohesive energy compared to other surface oxides. A reversible phase transformation between the cubic and tetragonal/monoclinic spinel was driven by stress and temperature during high temperature wear. To span Ni- and Cr-based ternary oxide compositional spaces for which little high-temperature COF data exist, we develop a computational design method to predict the lubricity of oxides, incorporating thermodynamics and density functional theory computations. Our finding demonstrates that spinel oxide can exhibit low COF values at temperatures much higher than conventional solid lubricants with 2D layered or Magnéli structures, suggesting a promising design strategy for self-lubricating high-temperature alloys.
Competing Interests: Competing interests: The authors declare no competing interests.
(© 2024. The Author(s).)
Databáze: MEDLINE
Externí odkaz: