| 1. |
- Broitman, E., et al.
(författare)
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Mechanical and tribological properties of CNx films deposited by reactive magnetron sputtering
- 2001
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Ingår i: Wear. - 0043-1648 .- 1873-2577. ; 248:1-2, s. 55-64
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Tidskriftsartikel (refereegranskat)abstract
- The hardness, elasticity, wear rate and friction coefficient of carbon nitride (CNx) films of defined microstructure and composition are presented. CNx films were deposited by dc reactive magnetron sputtering from a C target in N2/Ar plasma. Films were grown on Si (001), Ni, and HSS substrates to thickness of ~0.5 µm at a total pressure of 3 mTorr with the N2 fraction varied from 0 to 1, and the substrate temperature Ts, varied from ambient to 350°C. The mechanical and tribological properties of the coatings were evaluated by nanoindentation and dry ball-on-disk test. For CNx (0 = x = 0.35) films deposited below 200°C (amorphous structure), the elastic recovery and hardness do not change significantly with increasing N concentration, however, the friction coefficient increases from 0.19 to 0.45, while the coating wear rate is low. For CNx (0 = x = 0.15) films grown at Ts = 350°C, where a transition from a graphite-like to a "fullerene-like" phase occurs, a dramatic increase in hardness and elasticity is observed. Furthermore, the rms surface roughness decreases from 15.0 to 0.4 nm. For 0.15 = x = 0.20, CNx films deposited at Ts = 350°C (fullerene-like phase) exhibit a smooth surface, high hardness and elasticity (~90% recovery), and a coefficient of friction against hard steel of ~0.25. For all substrates, film friction coefficient tends to increase as the nitrogen content in the film is increased. Results also indicate the formation of a transfer layer which improves the tribological properties of the films. © 2001 Elsevier Science B.V. All rights reserved.
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| 2. |
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| 3. |
- Hollman, P, et al.
(författare)
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Friction properties of smooth nanocrystalline diamond coatings
- 1998
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Ingår i: DIAMOND AND RELATED MATERIALS. - : ELSEVIER SCIENCE SA. - 0925-9635. ; 7:10, s. 1471-1477
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Smooth nanocrystalline diamond coatings (NDC) have been deposited on spherical cemented carbide substrates. These coatings have been tested in dry and lubricated (water, oil) sliding against cemented carbide (CC), ball-bearing steel (BBS), stainless steel
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| 4. |
- Krupicka, A., et al.
(författare)
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Mechanical response of ductile polymer coatings to contact and tensile deformation
- 2003
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Ingår i: Progress in organic coatings. - : Elsevier BV. - 0300-9440 .- 1873-331X. ; 48:1, s. 1-13
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Tidskriftsartikel (refereegranskat)abstract
- Ductile polymer coatings were investigated in terms of their response to uniaxial deformation and contact deformation with respect to indentation and scratching. The effects of pigmentation, contact geometry, load and speed on the mechanical response were studied. The materials have been tested with extended spherical contacts deep into the coating layer and concentrated conical contacts close to the surface. The residual deformation pattern was examined with optical microscopy, white-light interferometry and atomic force microscopy. In the case of extended spherical contacts, corresponding to small effective strains, there was a correlation between the magnitude of residual deformation and the tensile strength. In the case of concentrated conical contacts, corresponding to larger strains, the materials were ranked differently. Reproducible failure transitions were detected with increased scratch load for the conical contacts. These failure transitions could not be directly linked to uniaxial break parameters. Stratification appears to be an issue in pigmented coatings. The effect of pigmentation was increased tensile stiffness and improved scratch resistance.
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| 5. |
- Podgornik, B, et al.
(författare)
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Wear and friction behaviour of duplex-treated AISI 4140 steel
- 1999
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Ingår i: SURFACE & COATINGS TECHNOLOGY. - : ELSEVIER SCIENCE SA. - 0257-8972. ; 121, s. 502-508
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- In this study samples of AISI 4140 steel were pretreated by plasma nitriding: and coated with two different physical vapour deposited coatings (TIN and TiAlN). A hardened AISI 4140 sample and a coated sample were also included in the investigation. To exa
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| 6. |
- Wanstrand, O, et al.
(författare)
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A tribological study of PVD coatings with carbon-rich outer layers
- 1997
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Ingår i: SURFACE & COATINGS TECHNOLOGY. - : ELSEVIER SCIENCE SA. - 0257-8972. ; 94-5:1-3, s. 469-475
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Multilayered PVD coatings, about 2 mu m thick, based on nitrides and carbides of titanium or chromium have been deposited on high speed steel with a multi-are PVD equipment. In particular, the effect of the carbon content in the top layer of the coatings
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| 7. |
- Wanstrand, O, et al.
(författare)
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Mechanical and tribological evaluation of PVD WC/C coatings
- 1999
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Ingår i: SURFACE & COATINGS TECHNOLOGY. - : ELSEVIER SCIENCE SA. - 0257-8972. ; 111:2-3, s. 247-254
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Five different WC/C coatings deposited by physical vapour deposition (PVD) on high speed-steel (HSS) have been evaluated with respect to their mechanical and tribological properties. For all coatings a chromium layer was deposited first to enhance coating
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| 8. |
- Wiklund, U, et al.
(författare)
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Evaluation of new multilayered physical vapour deposition coatings in sliding contact
- 1999
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Ingår i: WEAR. - : ELSEVIER SCIENCE SA. - 0043-1648. ; 236:1-2, s. 88-95
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Tidskriftsartikel (refereegranskat)abstract
- Much of the current development in surface engineering is focused on multilayered coatings, i.e., layered combinations of two or more materials, often metals, nitrides or carbides. This concept has proven to offer both a high hardness and an improved toug
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