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Title: Development of ultrananocrystalline diamond (UNCD) coatings for multipurpose mechanical pump seals.

Abstract

The reliability and performance of silicon carbide (SiC) shaft seals on multipurpose mechanical pumps are improved by applying a protective coating of ultrananocrystalline diamond (UNCD). UNCD exhibits extreme hardness (97 GPa), low friction (0.1 in air) and outstanding chemical resistance. Consequently, the application of UNCD coatings to multipurpose mechanical pump seals can reduce frictional energy losses and eliminate the downtime and hazardous emissions from seal failure and leakage. In this study, UNCD films were prepared by microwave plasma chemical vapor deposition utilizing an argon/methane gas mixture. Prior to coating, the SiC seals were subjected to mechanical polishing using different grades of micron-sized diamond powder to produce different starting surfaces with well-controlled surface roughnesses. Following this roughening process, the seals were seeded by mechanical abrasion with diamond nanopowder, and subsequently coated with UNCD. The coated seals were subjected to dynamic wear testing performed at 3600 RPM and 100 psi for up to 10 days during which the seals were periodically removed and inspected. The UNCD-coated seals were examined using Raman microanalysis, scanning electron microscopy, optical profilometry, and adhesion testing before and after the wear testing. These analyses revealed that delamination of the UNCD films was prevented when the initial SiC sealmore » surface had an initial roughness >0.1 {micro}m. In addition, the UNCD surfaces showed no measurable wear as compared to approximately 0.2 {micro}m of wear for the untreated SiC surfaces.« less

Authors:
; ; ; ; ; ; ; ;  [1]
  1. Materials Science Division
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1009367
Report Number(s):
ANL/MSD/JA-69364
Journal ID: 0043-1648; TRN: US201106%%554
DOE Contract Number:  
DE-AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Wear
Additional Journal Information:
Journal Volume: 270; Journal Issue: 3-4 ; Jan. 2011
Country of Publication:
United States
Language:
ENGLISH
Subject:
36 MATERIALS SCIENCE; ABRASION; ADHESION; AIR; CHEMICAL VAPOR DEPOSITION; COATINGS; DIAMONDS; ENERGY LOSSES; FRICTION; HARDNESS; MECHANICAL POLISHING; MICROANALYSIS; PERFORMANCE; PLASMA; PROTECTIVE COATINGS; RELIABILITY; ROUGHNESS; SCANNING ELECTRON MICROSCOPY; SILICON CARBIDES; TESTING

Citation Formats

Kovalchenko, A M, Elam, J W, Erdemir, A, Carlisle, J A, Auciello, O, Libera, J A, Pellin, M J, Gruen, D M, Hryn, J N, and Georgia Inst. of Tech.). Development of ultrananocrystalline diamond (UNCD) coatings for multipurpose mechanical pump seals.. United States: N. p., 2011. Web. doi:10.1016/j.wear.2010.10.059.
Kovalchenko, A M, Elam, J W, Erdemir, A, Carlisle, J A, Auciello, O, Libera, J A, Pellin, M J, Gruen, D M, Hryn, J N, & Georgia Inst. of Tech.). Development of ultrananocrystalline diamond (UNCD) coatings for multipurpose mechanical pump seals.. United States. doi:10.1016/j.wear.2010.10.059.
Kovalchenko, A M, Elam, J W, Erdemir, A, Carlisle, J A, Auciello, O, Libera, J A, Pellin, M J, Gruen, D M, Hryn, J N, and Georgia Inst. of Tech.). Sat . "Development of ultrananocrystalline diamond (UNCD) coatings for multipurpose mechanical pump seals.". United States. doi:10.1016/j.wear.2010.10.059.
@article{osti_1009367,
title = {Development of ultrananocrystalline diamond (UNCD) coatings for multipurpose mechanical pump seals.},
author = {Kovalchenko, A M and Elam, J W and Erdemir, A and Carlisle, J A and Auciello, O and Libera, J A and Pellin, M J and Gruen, D M and Hryn, J N and Georgia Inst. of Tech.)},
abstractNote = {The reliability and performance of silicon carbide (SiC) shaft seals on multipurpose mechanical pumps are improved by applying a protective coating of ultrananocrystalline diamond (UNCD). UNCD exhibits extreme hardness (97 GPa), low friction (0.1 in air) and outstanding chemical resistance. Consequently, the application of UNCD coatings to multipurpose mechanical pump seals can reduce frictional energy losses and eliminate the downtime and hazardous emissions from seal failure and leakage. In this study, UNCD films were prepared by microwave plasma chemical vapor deposition utilizing an argon/methane gas mixture. Prior to coating, the SiC seals were subjected to mechanical polishing using different grades of micron-sized diamond powder to produce different starting surfaces with well-controlled surface roughnesses. Following this roughening process, the seals were seeded by mechanical abrasion with diamond nanopowder, and subsequently coated with UNCD. The coated seals were subjected to dynamic wear testing performed at 3600 RPM and 100 psi for up to 10 days during which the seals were periodically removed and inspected. The UNCD-coated seals were examined using Raman microanalysis, scanning electron microscopy, optical profilometry, and adhesion testing before and after the wear testing. These analyses revealed that delamination of the UNCD films was prevented when the initial SiC seal surface had an initial roughness >0.1 {micro}m. In addition, the UNCD surfaces showed no measurable wear as compared to approximately 0.2 {micro}m of wear for the untreated SiC surfaces.},
doi = {10.1016/j.wear.2010.10.059},
journal = {Wear},
number = 3-4 ; Jan. 2011,
volume = 270,
place = {United States},
year = {2011},
month = {1}
}