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Tribological Behavior of NiMoAl-Based Self-Lubricating Composites

[Image: see text] The present study focused on the development of NiMoAl-based self-lubricating composites using solid lubricants as the second phase by powder metallurgy. For this, Cr(2)AlC MAX phase, Cr(2)AlC–Ag, and MoS(2) powders were mixed with the NiMoAl-based matrix and subsequently hot press...

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Autores principales: Davis, Deepak, Marappan, Gobinath, Sivalingam, Yuvaraj, Panigrahi, Bharat B., Singh, Sheela
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2020
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7315575/
https://www.ncbi.nlm.nih.gov/pubmed/32596604
http://dx.doi.org/10.1021/acsomega.0c01409
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author Davis, Deepak
Marappan, Gobinath
Sivalingam, Yuvaraj
Panigrahi, Bharat B.
Singh, Sheela
author_facet Davis, Deepak
Marappan, Gobinath
Sivalingam, Yuvaraj
Panigrahi, Bharat B.
Singh, Sheela
author_sort Davis, Deepak
collection PubMed
description [Image: see text] The present study focused on the development of NiMoAl-based self-lubricating composites using solid lubricants as the second phase by powder metallurgy. For this, Cr(2)AlC MAX phase, Cr(2)AlC–Ag, and MoS(2) powders were mixed with the NiMoAl-based matrix and subsequently hot pressed to produce bulk composite samples. The average hardness and wear resistance of the matrix were found to be increased with the addition of MoS(2), Cr(2)AlC MAX phase, and Cr(2)AlC–Ag powder to the NiMoAl matrix. The addition of Cr(2)AlC to NiMoAl was more effective in improving the wear resistance than MoS(2). The addition of Cr(2)AlC and Cr(2)AlC–Ag has increased the hardness by about 75% than that with the addition of NiMoAl alloy. A scanning Kelvin probe system was used to study the surface properties of the tribofilm in detail through work function mapping from the edge area to the wear area (groove). Among all the samples, the one with the addition of Cr(2)AlC–Ag powder to the NiMoAl matrix possesses the best tribo-mechanical properties. Cr(2)AlC–Ag composite addition to NiMoAl was found to decrease the wear rate by one-third and to reduce the coefficient of friction by one-fourth, compared to the base NiMoAl alloy. This was attributed to the high-sintered density and formation of strong tribofilms consisting of mixed oxides such as Ag(2)MoO(4) and Al(2)O(3), as confirmed by micro Raman spectra.
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spelling pubmed-73155752020-06-26 Tribological Behavior of NiMoAl-Based Self-Lubricating Composites Davis, Deepak Marappan, Gobinath Sivalingam, Yuvaraj Panigrahi, Bharat B. Singh, Sheela ACS Omega [Image: see text] The present study focused on the development of NiMoAl-based self-lubricating composites using solid lubricants as the second phase by powder metallurgy. For this, Cr(2)AlC MAX phase, Cr(2)AlC–Ag, and MoS(2) powders were mixed with the NiMoAl-based matrix and subsequently hot pressed to produce bulk composite samples. The average hardness and wear resistance of the matrix were found to be increased with the addition of MoS(2), Cr(2)AlC MAX phase, and Cr(2)AlC–Ag powder to the NiMoAl matrix. The addition of Cr(2)AlC to NiMoAl was more effective in improving the wear resistance than MoS(2). The addition of Cr(2)AlC and Cr(2)AlC–Ag has increased the hardness by about 75% than that with the addition of NiMoAl alloy. A scanning Kelvin probe system was used to study the surface properties of the tribofilm in detail through work function mapping from the edge area to the wear area (groove). Among all the samples, the one with the addition of Cr(2)AlC–Ag powder to the NiMoAl matrix possesses the best tribo-mechanical properties. Cr(2)AlC–Ag composite addition to NiMoAl was found to decrease the wear rate by one-third and to reduce the coefficient of friction by one-fourth, compared to the base NiMoAl alloy. This was attributed to the high-sintered density and formation of strong tribofilms consisting of mixed oxides such as Ag(2)MoO(4) and Al(2)O(3), as confirmed by micro Raman spectra. American Chemical Society 2020-06-09 /pmc/articles/PMC7315575/ /pubmed/32596604 http://dx.doi.org/10.1021/acsomega.0c01409 Text en Copyright © 2020 American Chemical Society This is an open access article published under an ACS AuthorChoice License (http://pubs.acs.org/page/policy/authorchoice_termsofuse.html) , which permits copying and redistribution of the article or any adaptations for non-commercial purposes.
spellingShingle Davis, Deepak
Marappan, Gobinath
Sivalingam, Yuvaraj
Panigrahi, Bharat B.
Singh, Sheela
Tribological Behavior of NiMoAl-Based Self-Lubricating Composites
title Tribological Behavior of NiMoAl-Based Self-Lubricating Composites
title_full Tribological Behavior of NiMoAl-Based Self-Lubricating Composites
title_fullStr Tribological Behavior of NiMoAl-Based Self-Lubricating Composites
title_full_unstemmed Tribological Behavior of NiMoAl-Based Self-Lubricating Composites
title_short Tribological Behavior of NiMoAl-Based Self-Lubricating Composites
title_sort tribological behavior of nimoal-based self-lubricating composites
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7315575/
https://www.ncbi.nlm.nih.gov/pubmed/32596604
http://dx.doi.org/10.1021/acsomega.0c01409
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