Microstructure evolution and enhanced vacuum tribological performance of Ni-doped WS2 composite coating

Shu Sheng Xu, Li Jun Weng, Yu Zhen Liu, Kyeong Hee Kang, Chang Lae Kim, Dae Eun Kim

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Ni-doped WS2 composite coatings with various Ni contents were co-deposited using a radio frequency sputtering system on silicon wafer and AISI 440C stainless steel substrates. The microstructural characteristics of the WS2-Ni composite coatings and their tribological properties in vacuum were assessed. During introduction of Ni dopant in the WS2-Ni composite coating the sulfur/tungsten (S/W) ratio in the coating increased due to reduced preferential resputtering of sulfur atoms in the growing coating. The microstructure of the WS2-Ni composite coating varied from a fine columnar structure for Ni content equal to or less than 7.7 at.% to a featureless structure as the Ni content increased further. The Ni dopant inhibited the growth of the coarse columnar WS2 platelets which was accompanied by nanocrystallization and amorphization of the composite coating structure. WS2-Ni composite coatings with fine columnar structure exhibited relatively low hardness but showed a high tendency to form a lubricating transfer layer. It also demonstrated low brittleness and prolonged wear life in vacuum condition compared to coatings with dense featureless structure. The variation in tribological performance between the composite coatings resulted from the different wear mechanisms associated with their distinct microstructures.

Original languageEnglish
Pages (from-to)81-88
Number of pages8
JournalSurface and Coatings Technology
Volume325
DOIs
Publication statusPublished - 2017 Sep 25

Fingerprint

Composite coatings
Vacuum
coatings
vacuum
microstructure
Microstructure
composite materials
Sulfur
Coatings
Doping (additives)
Wear of materials
Nanocrystallization
Tungsten
Amorphization
Stainless Steel
sulfur
fine structure
Brittleness
Platelets
Silicon wafers

All Science Journal Classification (ASJC) codes

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

Cite this

Xu, Shu Sheng ; Weng, Li Jun ; Liu, Yu Zhen ; Kang, Kyeong Hee ; Kim, Chang Lae ; Kim, Dae Eun. / Microstructure evolution and enhanced vacuum tribological performance of Ni-doped WS2 composite coating. In: Surface and Coatings Technology. 2017 ; Vol. 325. pp. 81-88.
@article{7809a8e1713f436a9f44f1078c607621,
title = "Microstructure evolution and enhanced vacuum tribological performance of Ni-doped WS2 composite coating",
abstract = "Ni-doped WS2 composite coatings with various Ni contents were co-deposited using a radio frequency sputtering system on silicon wafer and AISI 440C stainless steel substrates. The microstructural characteristics of the WS2-Ni composite coatings and their tribological properties in vacuum were assessed. During introduction of Ni dopant in the WS2-Ni composite coating the sulfur/tungsten (S/W) ratio in the coating increased due to reduced preferential resputtering of sulfur atoms in the growing coating. The microstructure of the WS2-Ni composite coating varied from a fine columnar structure for Ni content equal to or less than 7.7 at.{\%} to a featureless structure as the Ni content increased further. The Ni dopant inhibited the growth of the coarse columnar WS2 platelets which was accompanied by nanocrystallization and amorphization of the composite coating structure. WS2-Ni composite coatings with fine columnar structure exhibited relatively low hardness but showed a high tendency to form a lubricating transfer layer. It also demonstrated low brittleness and prolonged wear life in vacuum condition compared to coatings with dense featureless structure. The variation in tribological performance between the composite coatings resulted from the different wear mechanisms associated with their distinct microstructures.",
author = "Xu, {Shu Sheng} and Weng, {Li Jun} and Liu, {Yu Zhen} and Kang, {Kyeong Hee} and Kim, {Chang Lae} and Kim, {Dae Eun}",
year = "2017",
month = "9",
day = "25",
doi = "10.1016/j.surfcoat.2017.06.036",
language = "English",
volume = "325",
pages = "81--88",
journal = "Surface and Coatings Technology",
issn = "0257-8972",
publisher = "Elsevier",

}

Microstructure evolution and enhanced vacuum tribological performance of Ni-doped WS2 composite coating. / Xu, Shu Sheng; Weng, Li Jun; Liu, Yu Zhen; Kang, Kyeong Hee; Kim, Chang Lae; Kim, Dae Eun.

In: Surface and Coatings Technology, Vol. 325, 25.09.2017, p. 81-88.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Microstructure evolution and enhanced vacuum tribological performance of Ni-doped WS2 composite coating

AU - Xu, Shu Sheng

AU - Weng, Li Jun

AU - Liu, Yu Zhen

AU - Kang, Kyeong Hee

AU - Kim, Chang Lae

AU - Kim, Dae Eun

PY - 2017/9/25

Y1 - 2017/9/25

N2 - Ni-doped WS2 composite coatings with various Ni contents were co-deposited using a radio frequency sputtering system on silicon wafer and AISI 440C stainless steel substrates. The microstructural characteristics of the WS2-Ni composite coatings and their tribological properties in vacuum were assessed. During introduction of Ni dopant in the WS2-Ni composite coating the sulfur/tungsten (S/W) ratio in the coating increased due to reduced preferential resputtering of sulfur atoms in the growing coating. The microstructure of the WS2-Ni composite coating varied from a fine columnar structure for Ni content equal to or less than 7.7 at.% to a featureless structure as the Ni content increased further. The Ni dopant inhibited the growth of the coarse columnar WS2 platelets which was accompanied by nanocrystallization and amorphization of the composite coating structure. WS2-Ni composite coatings with fine columnar structure exhibited relatively low hardness but showed a high tendency to form a lubricating transfer layer. It also demonstrated low brittleness and prolonged wear life in vacuum condition compared to coatings with dense featureless structure. The variation in tribological performance between the composite coatings resulted from the different wear mechanisms associated with their distinct microstructures.

AB - Ni-doped WS2 composite coatings with various Ni contents were co-deposited using a radio frequency sputtering system on silicon wafer and AISI 440C stainless steel substrates. The microstructural characteristics of the WS2-Ni composite coatings and their tribological properties in vacuum were assessed. During introduction of Ni dopant in the WS2-Ni composite coating the sulfur/tungsten (S/W) ratio in the coating increased due to reduced preferential resputtering of sulfur atoms in the growing coating. The microstructure of the WS2-Ni composite coating varied from a fine columnar structure for Ni content equal to or less than 7.7 at.% to a featureless structure as the Ni content increased further. The Ni dopant inhibited the growth of the coarse columnar WS2 platelets which was accompanied by nanocrystallization and amorphization of the composite coating structure. WS2-Ni composite coatings with fine columnar structure exhibited relatively low hardness but showed a high tendency to form a lubricating transfer layer. It also demonstrated low brittleness and prolonged wear life in vacuum condition compared to coatings with dense featureless structure. The variation in tribological performance between the composite coatings resulted from the different wear mechanisms associated with their distinct microstructures.

UR - http://www.scopus.com/inward/record.url?scp=85021211948&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85021211948&partnerID=8YFLogxK

U2 - 10.1016/j.surfcoat.2017.06.036

DO - 10.1016/j.surfcoat.2017.06.036

M3 - Article

AN - SCOPUS:85021211948

VL - 325

SP - 81

EP - 88

JO - Surface and Coatings Technology

JF - Surface and Coatings Technology

SN - 0257-8972

ER -