Characterisation of ultra-thin DLC coatings by SEM/EDX, AFM and electrochemical techniques

ZH Liu, P Lemoine, JF Zhao, DM Zhou, S Mailley, ET McAdams, PD Maguire, JAD McLaughlin

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Characterisation of DLC coatings ion beam-deposited on to AlTiC substrate (70 wt% Al2O3 + 30 wt% TiC) has been carried out. AFM and SEM analysis showed that the island-like topography of DLC-coated AlTiC substrates is very similar to that of uncoated substrate, implying the full coverage of coatings without visible defects. Moreover, the island height was found to increase on average either with film thickness or deposition voltage due to the possible preferential growth of DLC on TiC and the possible preferential sputter etching of Al2O3 by energetic ions at the initial film growth stage when deposited at increased voltages. Electrochemical measurements showed that coating with relatively thick DLC films (> 100 nm) at an ion beam deposition voltage of 200 V can enhance significantly the impedance of sample/solution interface so as to increase the corrosion potential of the substrate. For a given film thickness, however, the impedance as well as the corrosion potential increase with deposition voltage up to 200 V and decrease thereafter. This is attributed mainly to the kinetic energy-dependent microstructure of both DLC and the coating/substrate interface. Consequently, deposition of DLC under proper conditions can improve dramatically the corrosion resistance of AlTiC when used in a corrosive environment. (C) 1998 Elsevier Science S.A.
LanguageEnglish
Pages1059-1065
JournalDiamond and Related Materials
Volume7
Issue number7
Publication statusPublished - Jul 1998

Fingerprint

atomic force microscopy
coatings
scanning electron microscopy
electric potential
corrosion
film thickness
ion beams
impedance
corrosion resistance
thick films
topography
kinetic energy
etching
microstructure
defects
ions

Keywords

  • AFM
  • DLC on AlTiC
  • electrochemical characterisation
  • SEM/EDX

Cite this

@article{ba75fe31bcbf4a8ab9a7b33e528354a9,
title = "Characterisation of ultra-thin DLC coatings by SEM/EDX, AFM and electrochemical techniques",
abstract = "Characterisation of DLC coatings ion beam-deposited on to AlTiC substrate (70 wt{\%} Al2O3 + 30 wt{\%} TiC) has been carried out. AFM and SEM analysis showed that the island-like topography of DLC-coated AlTiC substrates is very similar to that of uncoated substrate, implying the full coverage of coatings without visible defects. Moreover, the island height was found to increase on average either with film thickness or deposition voltage due to the possible preferential growth of DLC on TiC and the possible preferential sputter etching of Al2O3 by energetic ions at the initial film growth stage when deposited at increased voltages. Electrochemical measurements showed that coating with relatively thick DLC films (> 100 nm) at an ion beam deposition voltage of 200 V can enhance significantly the impedance of sample/solution interface so as to increase the corrosion potential of the substrate. For a given film thickness, however, the impedance as well as the corrosion potential increase with deposition voltage up to 200 V and decrease thereafter. This is attributed mainly to the kinetic energy-dependent microstructure of both DLC and the coating/substrate interface. Consequently, deposition of DLC under proper conditions can improve dramatically the corrosion resistance of AlTiC when used in a corrosive environment. (C) 1998 Elsevier Science S.A.",
keywords = "AFM, DLC on AlTiC, electrochemical characterisation, SEM/EDX",
author = "ZH Liu and P Lemoine and JF Zhao and DM Zhou and S Mailley and ET McAdams and PD Maguire and JAD McLaughlin",
note = "Diamond 97 Conference, EDINBURGH, SCOTLAND, AUG 03-08, 1997",
year = "1998",
month = "7",
language = "English",
volume = "7",
pages = "1059--1065",
journal = "Diamond and Related Materials",
issn = "0925-9635",
publisher = "Elsevier",
number = "7",

}

Characterisation of ultra-thin DLC coatings by SEM/EDX, AFM and electrochemical techniques. / Liu, ZH; Lemoine, P; Zhao, JF; Zhou, DM; Mailley, S; McAdams, ET; Maguire, PD; McLaughlin, JAD.

In: Diamond and Related Materials, Vol. 7, No. 7, 07.1998, p. 1059-1065.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Characterisation of ultra-thin DLC coatings by SEM/EDX, AFM and electrochemical techniques

AU - Liu, ZH

AU - Lemoine, P

AU - Zhao, JF

AU - Zhou, DM

AU - Mailley, S

AU - McAdams, ET

AU - Maguire, PD

AU - McLaughlin, JAD

N1 - Diamond 97 Conference, EDINBURGH, SCOTLAND, AUG 03-08, 1997

PY - 1998/7

Y1 - 1998/7

N2 - Characterisation of DLC coatings ion beam-deposited on to AlTiC substrate (70 wt% Al2O3 + 30 wt% TiC) has been carried out. AFM and SEM analysis showed that the island-like topography of DLC-coated AlTiC substrates is very similar to that of uncoated substrate, implying the full coverage of coatings without visible defects. Moreover, the island height was found to increase on average either with film thickness or deposition voltage due to the possible preferential growth of DLC on TiC and the possible preferential sputter etching of Al2O3 by energetic ions at the initial film growth stage when deposited at increased voltages. Electrochemical measurements showed that coating with relatively thick DLC films (> 100 nm) at an ion beam deposition voltage of 200 V can enhance significantly the impedance of sample/solution interface so as to increase the corrosion potential of the substrate. For a given film thickness, however, the impedance as well as the corrosion potential increase with deposition voltage up to 200 V and decrease thereafter. This is attributed mainly to the kinetic energy-dependent microstructure of both DLC and the coating/substrate interface. Consequently, deposition of DLC under proper conditions can improve dramatically the corrosion resistance of AlTiC when used in a corrosive environment. (C) 1998 Elsevier Science S.A.

AB - Characterisation of DLC coatings ion beam-deposited on to AlTiC substrate (70 wt% Al2O3 + 30 wt% TiC) has been carried out. AFM and SEM analysis showed that the island-like topography of DLC-coated AlTiC substrates is very similar to that of uncoated substrate, implying the full coverage of coatings without visible defects. Moreover, the island height was found to increase on average either with film thickness or deposition voltage due to the possible preferential growth of DLC on TiC and the possible preferential sputter etching of Al2O3 by energetic ions at the initial film growth stage when deposited at increased voltages. Electrochemical measurements showed that coating with relatively thick DLC films (> 100 nm) at an ion beam deposition voltage of 200 V can enhance significantly the impedance of sample/solution interface so as to increase the corrosion potential of the substrate. For a given film thickness, however, the impedance as well as the corrosion potential increase with deposition voltage up to 200 V and decrease thereafter. This is attributed mainly to the kinetic energy-dependent microstructure of both DLC and the coating/substrate interface. Consequently, deposition of DLC under proper conditions can improve dramatically the corrosion resistance of AlTiC when used in a corrosive environment. (C) 1998 Elsevier Science S.A.

KW - AFM

KW - DLC on AlTiC

KW - electrochemical characterisation

KW - SEM/EDX

M3 - Article

VL - 7

SP - 1059

EP - 1065

JO - Diamond and Related Materials

T2 - Diamond and Related Materials

JF - Diamond and Related Materials

SN - 0925-9635

IS - 7

ER -