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Microstructure and High-Temperature Wear Performance of FeCr Matrix Self-Lubricating Composites from Room Temperature to 800 °C

FeCr matrix high-temperature self-lubricating composites reinforced by Mo, Ag, and CuO were fabricated by the powder metallurgy technique. The tribological behaviors of composites were studied at temperatures up to 800 °C. The CuO content was optimized according to the tribological results. Mo showe...

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Autores principales: Cui, Gongjun, Liu, Yanping, Gao, Guijun, Liu, Huiqiang, Kou, Ziming
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6981401/
https://www.ncbi.nlm.nih.gov/pubmed/31861920
http://dx.doi.org/10.3390/ma13010051
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author Cui, Gongjun
Liu, Yanping
Gao, Guijun
Liu, Huiqiang
Kou, Ziming
author_facet Cui, Gongjun
Liu, Yanping
Gao, Guijun
Liu, Huiqiang
Kou, Ziming
author_sort Cui, Gongjun
collection PubMed
description FeCr matrix high-temperature self-lubricating composites reinforced by Mo, Ag, and CuO were fabricated by the powder metallurgy technique. The tribological behaviors of composites were studied at temperatures up to 800 °C. The CuO content was optimized according to the tribological results. Mo showed an obvious lubricating effect when it converted into MoO(3). The bimetallic oxide system formed high-temperature solid lubricants with low shear strength. CuO reacted with MoO(3) and formed CuMoO(4) and Cu(3)Mo(2)O(9). The composites showed an increase in the friction coefficient with the increase of CuO. However, the wear rates decreased with the increase of CuO. The critical threshold at which there was a transition of friction coefficients and wear rates from room temperature (RT) to 800 °C was 10 wt.% CuO. The Fe(Cr)-14% Mo-10.5% Ag-10% CuO composite showed the most reasonable high-temperature tribological behaviors. This was ascribed to the synergistic effects of silver, Mo, in situ formed solid lubricants (metal oxides and salt compounds), and the stable oxide film on the worn surfaces. At elevated temperatures, the dominant wear mechanism was oxidation wear.
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spelling pubmed-69814012020-02-07 Microstructure and High-Temperature Wear Performance of FeCr Matrix Self-Lubricating Composites from Room Temperature to 800 °C Cui, Gongjun Liu, Yanping Gao, Guijun Liu, Huiqiang Kou, Ziming Materials (Basel) Article FeCr matrix high-temperature self-lubricating composites reinforced by Mo, Ag, and CuO were fabricated by the powder metallurgy technique. The tribological behaviors of composites were studied at temperatures up to 800 °C. The CuO content was optimized according to the tribological results. Mo showed an obvious lubricating effect when it converted into MoO(3). The bimetallic oxide system formed high-temperature solid lubricants with low shear strength. CuO reacted with MoO(3) and formed CuMoO(4) and Cu(3)Mo(2)O(9). The composites showed an increase in the friction coefficient with the increase of CuO. However, the wear rates decreased with the increase of CuO. The critical threshold at which there was a transition of friction coefficients and wear rates from room temperature (RT) to 800 °C was 10 wt.% CuO. The Fe(Cr)-14% Mo-10.5% Ag-10% CuO composite showed the most reasonable high-temperature tribological behaviors. This was ascribed to the synergistic effects of silver, Mo, in situ formed solid lubricants (metal oxides and salt compounds), and the stable oxide film on the worn surfaces. At elevated temperatures, the dominant wear mechanism was oxidation wear. MDPI 2019-12-20 /pmc/articles/PMC6981401/ /pubmed/31861920 http://dx.doi.org/10.3390/ma13010051 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Cui, Gongjun
Liu, Yanping
Gao, Guijun
Liu, Huiqiang
Kou, Ziming
Microstructure and High-Temperature Wear Performance of FeCr Matrix Self-Lubricating Composites from Room Temperature to 800 °C
title Microstructure and High-Temperature Wear Performance of FeCr Matrix Self-Lubricating Composites from Room Temperature to 800 °C
title_full Microstructure and High-Temperature Wear Performance of FeCr Matrix Self-Lubricating Composites from Room Temperature to 800 °C
title_fullStr Microstructure and High-Temperature Wear Performance of FeCr Matrix Self-Lubricating Composites from Room Temperature to 800 °C
title_full_unstemmed Microstructure and High-Temperature Wear Performance of FeCr Matrix Self-Lubricating Composites from Room Temperature to 800 °C
title_short Microstructure and High-Temperature Wear Performance of FeCr Matrix Self-Lubricating Composites from Room Temperature to 800 °C
title_sort microstructure and high-temperature wear performance of fecr matrix self-lubricating composites from room temperature to 800 °c
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6981401/
https://www.ncbi.nlm.nih.gov/pubmed/31861920
http://dx.doi.org/10.3390/ma13010051
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