Enhanced sealing performance with CVD nanocrystalline diamond films in self-mated mechanical seals

Mubarok, Fahmi; Carrapichano, J.M.; Almeida, F.A.; Fernandes, A.J.S.; Silva, Rui

doi:10.1016/j.diamond.2008.01.052

Cited by 34 publications

(11 citation statements)

References 15 publications

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“…This is particularly attractive for applications such as mechanical seals where a low surface roughness is needed to prevent leakages. Mubarok et al [99] used a ring-on-ring test apparatus to evaluate diamond-coated Si 3 N 4 seals. The nanocrystalline diamond coating (2 µm in thickness) had a surface R a of 62 nm, which removed the need for running-in procedures.…”

Section: Mechanical Sealsmentioning

confidence: 99%

Applications of Diamond to Improve Tribological Performance in the Oil and Gas Industry

Wheeler

2018

Lubricants

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The use of diamond in tribological applications in the oil and gas industry is reviewed. The high hardness, strength, and corrosion resistance of diamond make it an attractive option for components that are susceptible to degradation by abrasive, erosive, or adhesive wear; such components may also be prone to corrosion owing to the nature of the environments to which they are often exposed. Applications such as drill bits, bearings, and mechanical seals benefit from the use of diamond, while choke valves are the subject of research programs to assess the suitability of chemical vapor deposition (CVD) diamond for these components. Also discussed are some of the conditions experienced by the components and how the properties of diamond enhance their operating lives.

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Section: Mechanical Sealsmentioning

confidence: 99%

Applications of Diamond to Improve Tribological Performance in the Oil and Gas Industry

Wheeler

2018

Lubricants

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“…A recent application of the water lubricated NCD-on-NCD tribosystem consists in its use for mechanical face seals [16]. For such purpose, 2 μm thick NCD coatings were grown by MPCVD technique on Si 3 N 4 ceramic mechanical seal rings and tested in a ringon-ring apparatus.…”

Section: Water Lubricated Tribosystemsmentioning

confidence: 99%

Nanodiamond-based tribosystems

Amaral

Abreu²,

Fernandes

et al. 2010

Surface and Coatings Technology

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“…These morphological and topographic characteristics, together with diamond´s extreme hardness and chemical inertness, are key factors for the application of NCD coatings in tribology. In fact, several works on the tribological behaviour of NCD-on-NCD contacts have been demonstrated the excellence of this tribopair [3][4][5][6][7]. Following a short-time running-in period where the protruding nanodiamond asperities suffer from truncation and blunting, the NCD-on-NCD sliding system attains a steady-state friction regime with very low friction coefficients (0.01-0.05), characteristic of highly polished passivated surfaces [4][5][6][7].…”

Section: Introductionmentioning

confidence: 97%

“…In fact, several works on the tribological behaviour of NCD-on-NCD contacts have been demonstrated the excellence of this tribopair [3][4][5][6][7]. Following a short-time running-in period where the protruding nanodiamond asperities suffer from truncation and blunting, the NCD-on-NCD sliding system attains a steady-state friction regime with very low friction coefficients (0.01-0.05), characteristic of highly polished passivated surfaces [4][5][6][7]. A very mild wear regime is in line with this friction response, with low wear coefficient values in the range of 10 -9 mm 3 ⋅N -1 ⋅m -1 for water lubricated contacts [5] and one order of magnitude higher for dry systems [4].…”

Section: Introductionmentioning

confidence: 98%

The High performance of nanocrystalline CVD diamond coated hip joints in wear simulator test

Maru

Amaral

Rodrigues

et al. 2015

Journal of the Mechanical Behavior of Biomedical Materials

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The superior biotribological performance of nanocrystalline diamond (NCD) coatings grown by a chemical vapor deposition (CVD) method was already shown to demonstrate high wear resistance in ball on plate experiments under physiological liquid lubrication. However, tests with a close-to-real approach were missing and this constitutes the aim of the present work. Hip joint wear simulator tests were performed with cups and heads made of silicon nitride coated with NCD of ~10 μm in thickness. Five million testing cycles (Mc) were run, which represent nearly five years of hip joint implant activity in a patient. For the wear analysis, gravimetry, profilometry, scanning electron microscopy and Raman spectroscopy techniques were used. After 0.5 Mc of wear test, truncation of the protruded regions of the NCD film happened as a result of a fine-scale abrasive wear mechanism, evolving to extensive plateau regions and highly polished surface condition (Ra<10nm). Such surface modification took place without any catastrophic features as cracking, grain pullouts or delamination of the coatings. A steady state volumetric wear rate of 0.02 mm(3)/Mc, equivalent to a linear wear of 0.27 μm/Mc favorably compares with the best performance reported in the literature for the fourth generation alumina ceramic (0.05 mm(3)/Mc). Also, squeaking, quite common phenomenon in hard-on-hard systems, was absent in the present all-NCD system.

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Enhanced sealing performance with CVD nanocrystalline diamond films in self-mated mechanical seals

Cited by 34 publications

References 15 publications

Applications of Diamond to Improve Tribological Performance in the Oil and Gas Industry

Applications of Diamond to Improve Tribological Performance in the Oil and Gas Industry

Nanodiamond-based tribosystems

The High performance of nanocrystalline CVD diamond coated hip joints in wear simulator test

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