Temperature activated self-lubrication in CrN/Mo2N nanolayer coatings

Robin Abraham Koshy; Michael E. Graham; Laurence D. Marks

doi:10.1016/j.surfcoat.2009.09.026

Temperature activated self-lubrication in CrN/Mo₂N nanolayer coatings

Robin Abraham Koshy^*, Michael E. Graham, Laurence D. Marks

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

34 Scopus citations

Abstract

CrN/Mo₂N multilayers were deposited and TEM, SEM, EDS, XPS and TGA studies were carried out. TEM studies show crystalline layers with sharp interfaces. TGA studies indicate that the CrN protects the underlying Mo₂N layers from oxidation. On varying the periodicity the hardness of the films are in the 20-30 GPa regime, within the rule of mixtures of its constituents. Friction tests at high temperature shows the films to have a temperature activated self lubrication mechanism. Similar friction tests in a near nitrogen atmosphere shows the same temperature activated lubrication mechanism operating with the friction being in a lower regime. MoO₃ is isolated as the predominant oxides phase that evolves from the surface and at temperatures in excess of 400 °C acts as an in situ lubricant.

Original language	English (US)
Pages (from-to)	1359-1365
Number of pages	7
Journal	Surface and Coatings Technology
Volume	204
Issue number	9-10
DOIs	https://doi.org/10.1016/j.surfcoat.2009.09.026
State	Published - Jan 25 2010

Keywords

CrN
CrN/MoN
Hard coatings
High temperature friction
High temperature lubrication
In-situ lubrication
Lubricious oxides
Lubricous oxides
Magnetron
MoN
Multi-layers
Multilayer coatings
Multilayered coatings
Nanolayers
Reactive sputtering
Self lubrication
Sputtering
Temperature activated lubrication
Tool coatings

ASJC Scopus subject areas

Chemistry(all)
Condensed Matter Physics
Surfaces and Interfaces
Surfaces, Coatings and Films
Materials Chemistry

Access to Document

10.1016/j.surfcoat.2009.09.026

Cite this

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title = "Temperature activated self-lubrication in CrN/Mo2N nanolayer coatings",

abstract = "CrN/Mo2N multilayers were deposited and TEM, SEM, EDS, XPS and TGA studies were carried out. TEM studies show crystalline layers with sharp interfaces. TGA studies indicate that the CrN protects the underlying Mo2N layers from oxidation. On varying the periodicity the hardness of the films are in the 20-30 GPa regime, within the rule of mixtures of its constituents. Friction tests at high temperature shows the films to have a temperature activated self lubrication mechanism. Similar friction tests in a near nitrogen atmosphere shows the same temperature activated lubrication mechanism operating with the friction being in a lower regime. MoO3 is isolated as the predominant oxides phase that evolves from the surface and at temperatures in excess of 400 °C acts as an in situ lubricant.",

keywords = "CrN, CrN/MoN, Hard coatings, High temperature friction, High temperature lubrication, In-situ lubrication, Lubricious oxides, Lubricous oxides, Magnetron, MoN, Multi-layers, Multilayer coatings, Multilayered coatings, Nanolayers, Reactive sputtering, Self lubrication, Sputtering, Temperature activated lubrication, Tool coatings",

author = "Koshy, {Robin Abraham} and Graham, {Michael E.} and Marks, {Laurence D.}",

year = "2010",

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doi = "10.1016/j.surfcoat.2009.09.026",

language = "English (US)",

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pages = "1359--1365",

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TY - JOUR

T1 - Temperature activated self-lubrication in CrN/Mo2N nanolayer coatings

AU - Koshy, Robin Abraham

AU - Graham, Michael E.

AU - Marks, Laurence D.

PY - 2010/1/25

Y1 - 2010/1/25

N2 - CrN/Mo2N multilayers were deposited and TEM, SEM, EDS, XPS and TGA studies were carried out. TEM studies show crystalline layers with sharp interfaces. TGA studies indicate that the CrN protects the underlying Mo2N layers from oxidation. On varying the periodicity the hardness of the films are in the 20-30 GPa regime, within the rule of mixtures of its constituents. Friction tests at high temperature shows the films to have a temperature activated self lubrication mechanism. Similar friction tests in a near nitrogen atmosphere shows the same temperature activated lubrication mechanism operating with the friction being in a lower regime. MoO3 is isolated as the predominant oxides phase that evolves from the surface and at temperatures in excess of 400 °C acts as an in situ lubricant.

AB - CrN/Mo2N multilayers were deposited and TEM, SEM, EDS, XPS and TGA studies were carried out. TEM studies show crystalline layers with sharp interfaces. TGA studies indicate that the CrN protects the underlying Mo2N layers from oxidation. On varying the periodicity the hardness of the films are in the 20-30 GPa regime, within the rule of mixtures of its constituents. Friction tests at high temperature shows the films to have a temperature activated self lubrication mechanism. Similar friction tests in a near nitrogen atmosphere shows the same temperature activated lubrication mechanism operating with the friction being in a lower regime. MoO3 is isolated as the predominant oxides phase that evolves from the surface and at temperatures in excess of 400 °C acts as an in situ lubricant.

KW - CrN

KW - CrN/MoN

KW - Hard coatings

KW - High temperature friction

KW - High temperature lubrication

KW - In-situ lubrication

KW - Lubricious oxides

KW - Lubricous oxides

KW - Magnetron

KW - MoN

KW - Multi-layers

KW - Multilayer coatings

KW - Multilayered coatings

KW - Nanolayers

KW - Reactive sputtering

KW - Self lubrication

KW - Sputtering

KW - Temperature activated lubrication

KW - Tool coatings

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