Porosity of thin diamond-like carbon films deposited by an arc discharge method

Jari Koskinen, Ulla Ehrnsten, Amar Mahiout, Reima Lahtinen, Juha-Pekka Hirvonen, Simo-Pekka Hannula

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

In an arc-discharge method, diamond-like carbon (DLC) films are deposited by condensation of highly ionized carbon plasma on a substrate. These films, which are virtually hydrogen free, are best characterized as amorphous diamond. As reported previously, a low friction coefficient and a wear coefficient an order of a magnitude lower that that of silicon carbide has been determined in dry sliding contact with hardened carbon steel. These films are also presumably inherently highly corrosion resistant. However, utilization of DLC films in corrosive evironments depends on the degree of porosity. In this work we have determined the porosity of films deposited either with or without enhanced particle filtering, which was accomplished by hindrance plates inside the curved-magnetic-field solenoid. As substrates, discs of plain carbon steel with a diameter of 100 mm were employed. The samples were exposed to a neutral salt spray and the pores were determined using a Ferroxyl test and electrochemical measurements. The microstructural features and defects identified in corrosion and porosity tests were studied in detail using metallographic methods and scanning electron microscopy. On the basis of the results, the possibilities for using DLC films in corrosive environments are discussed.
Original languageEnglish
Pages (from-to)356 - 360
Number of pages5
JournalSurface and Coatings Technology
Volume62
Issue number1-3
DOIs
Publication statusPublished - 1993
MoE publication typeA1 Journal article-refereed

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Diamond like carbon films
arc discharges
Caustics
Porosity
diamonds
porosity
Carbon steel
carbon
Corrosion
Diamond
Solenoids
carbon steels
Substrates
Silicon carbide
Hydrogen
Condensation
Diamonds
Carbon
Salts
Wear of materials

Cite this

Koskinen, Jari ; Ehrnsten, Ulla ; Mahiout, Amar ; Lahtinen, Reima ; Hirvonen, Juha-Pekka ; Hannula, Simo-Pekka. / Porosity of thin diamond-like carbon films deposited by an arc discharge method. In: Surface and Coatings Technology. 1993 ; Vol. 62, No. 1-3. pp. 356 - 360.
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abstract = "In an arc-discharge method, diamond-like carbon (DLC) films are deposited by condensation of highly ionized carbon plasma on a substrate. These films, which are virtually hydrogen free, are best characterized as amorphous diamond. As reported previously, a low friction coefficient and a wear coefficient an order of a magnitude lower that that of silicon carbide has been determined in dry sliding contact with hardened carbon steel. These films are also presumably inherently highly corrosion resistant. However, utilization of DLC films in corrosive evironments depends on the degree of porosity. In this work we have determined the porosity of films deposited either with or without enhanced particle filtering, which was accomplished by hindrance plates inside the curved-magnetic-field solenoid. As substrates, discs of plain carbon steel with a diameter of 100 mm were employed. The samples were exposed to a neutral salt spray and the pores were determined using a Ferroxyl test and electrochemical measurements. The microstructural features and defects identified in corrosion and porosity tests were studied in detail using metallographic methods and scanning electron microscopy. On the basis of the results, the possibilities for using DLC films in corrosive environments are discussed.",
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Koskinen, J, Ehrnsten, U, Mahiout, A, Lahtinen, R, Hirvonen, J-P & Hannula, S-P 1993, 'Porosity of thin diamond-like carbon films deposited by an arc discharge method', Surface and Coatings Technology, vol. 62, no. 1-3, pp. 356 - 360. https://doi.org/10.1016/0257-8972(93)90267-R

Porosity of thin diamond-like carbon films deposited by an arc discharge method. / Koskinen, Jari; Ehrnsten, Ulla; Mahiout, Amar; Lahtinen, Reima; Hirvonen, Juha-Pekka; Hannula, Simo-Pekka.

In: Surface and Coatings Technology, Vol. 62, No. 1-3, 1993, p. 356 - 360.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Porosity of thin diamond-like carbon films deposited by an arc discharge method

AU - Koskinen, Jari

AU - Ehrnsten, Ulla

AU - Mahiout, Amar

AU - Lahtinen, Reima

AU - Hirvonen, Juha-Pekka

AU - Hannula, Simo-Pekka

N1 - Project code: KOT1010

PY - 1993

Y1 - 1993

N2 - In an arc-discharge method, diamond-like carbon (DLC) films are deposited by condensation of highly ionized carbon plasma on a substrate. These films, which are virtually hydrogen free, are best characterized as amorphous diamond. As reported previously, a low friction coefficient and a wear coefficient an order of a magnitude lower that that of silicon carbide has been determined in dry sliding contact with hardened carbon steel. These films are also presumably inherently highly corrosion resistant. However, utilization of DLC films in corrosive evironments depends on the degree of porosity. In this work we have determined the porosity of films deposited either with or without enhanced particle filtering, which was accomplished by hindrance plates inside the curved-magnetic-field solenoid. As substrates, discs of plain carbon steel with a diameter of 100 mm were employed. The samples were exposed to a neutral salt spray and the pores were determined using a Ferroxyl test and electrochemical measurements. The microstructural features and defects identified in corrosion and porosity tests were studied in detail using metallographic methods and scanning electron microscopy. On the basis of the results, the possibilities for using DLC films in corrosive environments are discussed.

AB - In an arc-discharge method, diamond-like carbon (DLC) films are deposited by condensation of highly ionized carbon plasma on a substrate. These films, which are virtually hydrogen free, are best characterized as amorphous diamond. As reported previously, a low friction coefficient and a wear coefficient an order of a magnitude lower that that of silicon carbide has been determined in dry sliding contact with hardened carbon steel. These films are also presumably inherently highly corrosion resistant. However, utilization of DLC films in corrosive evironments depends on the degree of porosity. In this work we have determined the porosity of films deposited either with or without enhanced particle filtering, which was accomplished by hindrance plates inside the curved-magnetic-field solenoid. As substrates, discs of plain carbon steel with a diameter of 100 mm were employed. The samples were exposed to a neutral salt spray and the pores were determined using a Ferroxyl test and electrochemical measurements. The microstructural features and defects identified in corrosion and porosity tests were studied in detail using metallographic methods and scanning electron microscopy. On the basis of the results, the possibilities for using DLC films in corrosive environments are discussed.

U2 - 10.1016/0257-8972(93)90267-R

DO - 10.1016/0257-8972(93)90267-R

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JO - Surface and Coatings Technology

JF - Surface and Coatings Technology

SN - 0257-8972

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ER -