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Coatings 2018, 8(5), 172; https://doi.org/10.3390/coatings8050172

HFCVD Diamond-Coated Mechanical Seals

Centre for Mechanical Technology & Automation (TEMA), Department of Mechanical Engineering, University of Aveiro, 3810-193 Aveiro, Portugal
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Received: 31 March 2018 / Revised: 24 April 2018 / Accepted: 2 May 2018 / Published: 3 May 2018
(This article belongs to the Special Issue Plasma Etching and Deposition)
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Abstract

A mechanical seal promotes the connection between systems or mechanisms, preventing the escape of fluids to the exterior. Nonetheless, due to extreme working conditions, premature failure can occur. Diamond, due to its excellent properties, is heralded as an excellent choice to cover the surface of these devices and extend their lifetime. Therefore, the main objective of this work was to deposit diamond films over mechanical seals and test the coated seals on a water pump, under real working conditions. The coatings were created by hot filament chemical vapor deposition (HFCVD) and two consecutive layers of micro- and nanocrystalline diamond were deposited. One of the main difficulties is the attainment of a good adhesion between the diamond films and the mechanical seal material (WC-Co). Nucleation, deposition conditions, and pre-treatments were studied to enhance the coating. Superficial wear or delamination of the film was investigated using SEM and Raman characterization techniques, in order to draw conclusions about the feasibility of these coatings in the WC-Co mechanical seals with the purpose of increasing their performance and life time. The results obtained gave a good indication about the feasibility of this process and the deposition conditions used, with the mechanical seals showing no wear and no film delamination after a real work environment test. View Full-Text
Keywords: mechanical seals; diamond; HFCVD; multi-layer; adhesion; WC-Co; superficial pre-treatments; wear tests mechanical seals; diamond; HFCVD; multi-layer; adhesion; WC-Co; superficial pre-treatments; wear tests
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Simões, R.; Martins, B.; Santos, J.; Neto, V. HFCVD Diamond-Coated Mechanical Seals. Coatings 2018, 8, 172.

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