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| Abstract No.: |
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Scheduled at:
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Thursday, June 08, 2017, Hall 26 9:20 AM
Wear Protection II
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| Title: |
The possibilities of applying industrial WCCoCr carbide coatings of ultra-fine powders to sliding rings of mechanical seals using the HVOF spraying process
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| Authors: |
Aleksander Iwaniak* / Silesian University of Technology, Poland
Grzegorz Wieclaw/ Certech Sp. z o.o., Poland
Lukasz Norymberczyk/ ANGA Uszczelnienia Mechaniczne Sp. z o.o., Poland
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| Abstract: |
In this paper, the friction properties of sliding rings whose working surfaces were covered with thermal-sprayed WCCoCr-type carbide coatings were explored. The layers were deposited by the HVOF process on selected types of metallic sliding rings using ultra-fine particle powders (within the range of 1÷10 ¼m) having a nanocrystalline structure. Homogeneous coatings with very low porosity (0.1%) and hardness of more than 1200 HV were obtained on the sliding rings. Long-term (400 hours of continuous operation) frictional wear tests of the coated sliding rings were performed at a specialized workstation simulating the operating conditions of mechanical seals. The tests showed that the friction pairs comprised of sliding rings covered with the coatings tested were characterised by low tribological wear and very good sealing properties. The tests proved that metallic sliding rings covered with the new WCCoCr carbide coatings would be able to replace effectively, in certain types of mechanical seals and their industrial applications, solid tungsten carbide (WC) ceramic rings that have been used so far.
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