Application of Carbon Hard Coatings on Mechanical Seals

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  • IKEGAMI Naohisa
    Material Engineering Department, Engineering Division, EAGLE INDUSTRY Co., Ltd.
  • AKIYAMA Koji
    Seal Engineering Department, Niigata Office, EagleBurgmann Japan Co., Ltd.
  • TAKIGAHIRA Yoshiaki
    GI Seal Engineering Department, Engineering Division, EAGLE INDUSTRY Co., Ltd.
  • TESHIMA Yoshihiro
    Standardization Department, Engineering Division, EagleBurgmann Japan Co., Ltd.

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Other Title
  • メカニカルシールへの炭素系硬質膜の適用
  • メカニカルシール エ ノ タンソケイ コウシツマク ノ テキヨウ

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<p>Mechanical seals require sliding material combinations having lower friction coefficient and higher wear resistance in order to fulfill increasing demand for saving energy, space and maintenance costs. Carbon hard coatings such as diamond and DLC coatings are considered as some of the most promising choices for that. Furthermore, due to their excellent chemical stability, they are preferably used in various working fluids and applications so as to prevent corrosion or chemical reaction as well as sliding material wear. Severe damages due to electrochemical corrosion were found on conventional SiC sliding materials of a mechanical seal in BFP (boiler feed pump) of CWT (combined water treatment) after 500 hours of operation. A diamond coating was applied to the SiC sliding materials to prevent the damages due to electrochemical corrosion and they could operate without damages during more than three years. Excessive wear occurred to conventional SiC sliding materials of dry gas seals due to dry running during startup and shutdown in high-pressure compressor applications such as EOR (enhanced oil recovery) and CCS (Carbon Capture Storage). A DLC coating was applied to the SiC sliding materials to prevent the wear due to dry running and it could realize successful operation of dry gas seals. From the perspective of expanding the application of carbon hard coatings to mechanical seal sliding materials, this paper also discusses challenges such as mass productivity of them, control of characteristics of DLC coatings, effective surface roughness control of diamond coatings and applying them to surface textured sliding materials.</p>

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