Friction and wear properties of DLC-coated plasma nitrided steel in unidirectional and reciprocating sliding

Bojan Podgornik (Corresponding Author), Jose Vizintin, Helena Ronkainen, Kenneth Holmberg

Research output: Contribution to journalArticleScientificpeer-review

30 Citations (Scopus)

Abstract

In this study samples of AISI 4140 steel were surface treated by plasma nitriding and coated with a hydrogen-free hard carbon coating, also known as tetrahedral amorphous carbon coating (ta-C). The specimens were investigated with respect to their microhardness, residual stress, coating adhesion and dry sliding wear resistance. Wear tests in which duplex-treated specimens were mated to hardened ball bearing steel were performed under unidirectional and reciprocating sliding. To examine the influence of the nitriding conditions on the performance of duplex-treated steel, the coating was deposited on hardened as well as on plasma nitrided samples, nitrided under two different nitriding conditions. The results show greatly improved sliding wear resistance of plasma-nitrided hard-coated specimens compared with un-coated and pre-hardened ones, observed for both unidirectional and reciprocating sliding. Furthermore, the hydrogen-free hard carbon coating produced a reduction in the coefficient of friction of approximately one order of magnitude. Although previous investigations showed the negative effect of a compound layer, it was found that the compound layer may act as an intermediate hard layer, leading to superior tribological properties of the composite.

Original languageEnglish
Pages (from-to)254 - 260
Number of pages7
JournalThin Solid Films
Volume377-378
DOIs
Publication statusPublished - 2000
MoE publication typeA1 Journal article-refereed

Fingerprint

Steel
sliding
friction
Wear of materials
steels
Friction
nitriding
Nitriding
Plasmas
coatings
Coatings
wear resistance
Wear resistance
Hydrogen
carbon
Carbon
ball bearings
Ball bearings
wear tests
Amorphous carbon

Keywords

  • Duplex treatment
  • DLC coating
  • Plasma nitriding
  • Unidirectional sliding
  • Reciprocating sliding

Cite this

Podgornik, Bojan ; Vizintin, Jose ; Ronkainen, Helena ; Holmberg, Kenneth. / Friction and wear properties of DLC-coated plasma nitrided steel in unidirectional and reciprocating sliding. In: Thin Solid Films. 2000 ; Vol. 377-378. pp. 254 - 260.
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abstract = "In this study samples of AISI 4140 steel were surface treated by plasma nitriding and coated with a hydrogen-free hard carbon coating, also known as tetrahedral amorphous carbon coating (ta-C). The specimens were investigated with respect to their microhardness, residual stress, coating adhesion and dry sliding wear resistance. Wear tests in which duplex-treated specimens were mated to hardened ball bearing steel were performed under unidirectional and reciprocating sliding. To examine the influence of the nitriding conditions on the performance of duplex-treated steel, the coating was deposited on hardened as well as on plasma nitrided samples, nitrided under two different nitriding conditions. The results show greatly improved sliding wear resistance of plasma-nitrided hard-coated specimens compared with un-coated and pre-hardened ones, observed for both unidirectional and reciprocating sliding. Furthermore, the hydrogen-free hard carbon coating produced a reduction in the coefficient of friction of approximately one order of magnitude. Although previous investigations showed the negative effect of a compound layer, it was found that the compound layer may act as an intermediate hard layer, leading to superior tribological properties of the composite.",
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Friction and wear properties of DLC-coated plasma nitrided steel in unidirectional and reciprocating sliding. / Podgornik, Bojan (Corresponding Author); Vizintin, Jose; Ronkainen, Helena; Holmberg, Kenneth.

In: Thin Solid Films, Vol. 377-378, 2000, p. 254 - 260.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Friction and wear properties of DLC-coated plasma nitrided steel in unidirectional and reciprocating sliding

AU - Podgornik, Bojan

AU - Vizintin, Jose

AU - Ronkainen, Helena

AU - Holmberg, Kenneth

N1 - Project code: V7SU01403

PY - 2000

Y1 - 2000

N2 - In this study samples of AISI 4140 steel were surface treated by plasma nitriding and coated with a hydrogen-free hard carbon coating, also known as tetrahedral amorphous carbon coating (ta-C). The specimens were investigated with respect to their microhardness, residual stress, coating adhesion and dry sliding wear resistance. Wear tests in which duplex-treated specimens were mated to hardened ball bearing steel were performed under unidirectional and reciprocating sliding. To examine the influence of the nitriding conditions on the performance of duplex-treated steel, the coating was deposited on hardened as well as on plasma nitrided samples, nitrided under two different nitriding conditions. The results show greatly improved sliding wear resistance of plasma-nitrided hard-coated specimens compared with un-coated and pre-hardened ones, observed for both unidirectional and reciprocating sliding. Furthermore, the hydrogen-free hard carbon coating produced a reduction in the coefficient of friction of approximately one order of magnitude. Although previous investigations showed the negative effect of a compound layer, it was found that the compound layer may act as an intermediate hard layer, leading to superior tribological properties of the composite.

AB - In this study samples of AISI 4140 steel were surface treated by plasma nitriding and coated with a hydrogen-free hard carbon coating, also known as tetrahedral amorphous carbon coating (ta-C). The specimens were investigated with respect to their microhardness, residual stress, coating adhesion and dry sliding wear resistance. Wear tests in which duplex-treated specimens were mated to hardened ball bearing steel were performed under unidirectional and reciprocating sliding. To examine the influence of the nitriding conditions on the performance of duplex-treated steel, the coating was deposited on hardened as well as on plasma nitrided samples, nitrided under two different nitriding conditions. The results show greatly improved sliding wear resistance of plasma-nitrided hard-coated specimens compared with un-coated and pre-hardened ones, observed for both unidirectional and reciprocating sliding. Furthermore, the hydrogen-free hard carbon coating produced a reduction in the coefficient of friction of approximately one order of magnitude. Although previous investigations showed the negative effect of a compound layer, it was found that the compound layer may act as an intermediate hard layer, leading to superior tribological properties of the composite.

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KW - DLC coating

KW - Plasma nitriding

KW - Unidirectional sliding

KW - Reciprocating sliding

U2 - 10.1016/S0040-6090(00)01302-X

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