HFCVD Diamond-Coated Mechanical Seals

Simões, Raul; Martins, Bruno; Santos, João Batista Oliveira dos; Neto, Victor

doi:10.3390/coatings8050172

Cited by 11 publications

(3 citation statements)

References 30 publications

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“…Hot filament chemical vapor deposition (HFCVD) was used to perform the diamond deposition due to its versatility, simplicity, and low cost of implementation, maintenance, and operation, while providing better control of the growth parameters [16].…”

Section: Methodsmentioning

confidence: 99%

Improving Pressure–Velocity Limit of Mechanical Seal with Polycrystalline Diamond Coating

Guo

Cai

Wu³

et al. 2020

Applied Sciences

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Polycrystalline diamond (PCD)-coated mechanical seal rings were prepared by hot filament chemical vapor deposition (HFCVD) on graphite-loaded silicon carbide (GSiC) substrates. From the initial deposition process, the diamond first nucleated and then grew into a dense coating with grain size of 4 μm and thickness of 12.3 μm. The well-grown PCD coating, as confirmed by Raman spectroscopy and X-ray diffractometry, significantly improves the pressure–velocity limit of the mechanical seal applied in harsh operating conditions, no matter whether for a hard-to-soft mating combination or a hard-to-hard mating combination. Comparing GSiC against sintered silicon carbide (SSiC) combination (GSiC/SSiC), GSiC against graphite combination (GSiC/graphite) and PCD against graphite combination (PCD/graphite), PCD against SSiC combination (PCD/SSiC) shows the highest pressure velocity (PV) limit of 42.31 MPa·m/s with 4 kN loading at 4500 rpm rotation speed. An extremely low and stable friction coefficient and super mechanical properties under harsh conditions can be approved as the source of the high PV limit of PCD coating. A mechanical seal with PCD coating can be used for more demanding applications.

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Section: Methodsmentioning

confidence: 99%

Improving Pressure–Velocity Limit of Mechanical Seal with Polycrystalline Diamond Coating

Guo

Cai

Wu³

et al. 2020

Applied Sciences

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“…The results show that the COF of NCD is 0.02–0.03 after the running-in regime and the limit normal load of wear tests depends on the surface roughness of substrate. Although diamond-coated mechanical seals have made great progress after years of development and research [ 28 , 29 , 30 ], there is little research on the dry tribological properties.…”

Section: Introductionmentioning

confidence: 99%

Dry Friction Properties of Diamond-Coated Silicon Carbide

Xie²,

Wang³

et al. 2023

Materials

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Dry friction between seal faces, caused by unstable or extreme operating conditions, significantly affects the running stability and service life of mechanical seals. Therefore, in this work, nanocrystalline diamond (NCD) coatings were prepared on the surface of silicon carbide (SiC) seal rings by hot filament chemical vapor deposition (HFCVD). The friction test results under dry environment reveals that the coefficient of friction (COF) of SiC–NCD seal pairs is about 0.07–0.09, which were reduced by 83–86% compared to SiC–SiC seal pairs. The wear rate of SiC–NCD seal pairs is relatively low, ranging from 1.13 × 10−7 mm3/N·m to 3.26 × 10−7 mm3/N·m under different test conditions, which is due to the fact that the NCD coatings prevent adhesive and abrasive wear between the SiC seal rings. The analysis and observation of the wear tracks illustrate that the excellent tribological performance of the SiC–NCD seal pairs is due to a self-lubricating amorphous layer formed on the worn surface. In conclusion, this work highlights a pathway to enable mechanical seals to satisfy the high application requirements under highly parametric working conditions.

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“…Nanocrystalline diamond film (NCD film) is material with outstanding properties, widely used in various field of science and technology. Thus, NCD films are used: as cutting tools protective coatings for highly abrasive and composite materials machining [1,2], protective coatings for multiphase pumps mechanical seals [3] and as a class of materials for biomedical field [4], optics [5] and electronics [6].…”

Section: Introductionmentioning

confidence: 99%

Properties of ultrananocrystalline diamond grown under different deposition conditions

Gaydaychuk¹,

Линник²,

Mitulinsky³

et al. 2022

8th International Congress on Energy Fluxes and Radiation Effects

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The influence of CH4 and N2 concentration in CH4/H2/N2gas mixture on microstructure and mechanical properties of diamond films is investigated. Nitrogen addition to the gas mixture up to 18.5 vol. % does not significantly affect the structure of the coating. In the entire range of gas concentrations, coating structure is represented by a set of dendrites consisting of diamond crystallites of various sizes, as well as non-diamond carbon. It is shown that CH4 has a greater effect on the coating hardness and Young's modulus. Besides, it has been found that nitrogen-doped diamond coatings have a higher level of tensile residual stress. With a decrease in coating thickness or nitrogen concentration in the gas mixture, this difference decreases.

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HFCVD Diamond-Coated Mechanical Seals

Cited by 11 publications

References 30 publications

Improving Pressure–Velocity Limit of Mechanical Seal with Polycrystalline Diamond Coating

Improving Pressure–Velocity Limit of Mechanical Seal with Polycrystalline Diamond Coating

Dry Friction Properties of Diamond-Coated Silicon Carbide

Properties of ultrananocrystalline diamond grown under different deposition conditions

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