Comparison between the RCF Performance of TiN- and TiO2-Laser Coated Ti64 Bearings

Edson Costa Santos; Justyna Rozwadowska; Katsuyuki Kida; Takashi Honda; Koshiro Mizobe; Yuji Kashima; Ryo Matsumoto; Chun Guo

doi:10.4028/www.scientific.net/AMR.566.308

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 566Comparison between the RCF Performance of TiN- and...

Comparison between the RCF Performance of TiN- and TiO₂-Laser Coated Ti64 Bearings

Abstract:

The present work is a comparison between the rolling contact fatigue (RCF) of laser processed titanium bearings by using a scanning Nd:YAG Q-sw laser. TiN and TiO2 layers were produced on Ti6Al4V (Ti64) in a closed chamber in nitrogen and air atmosphere, respectively. The average thickness of the layers was 2 m in case of TiN and 0.8 m in case of TiO2. Both non-coated and coated bearings were RCF tested in under-water conditions and it was found that laser processing greatly improved their wear resistance and load capacity. Almost 50-fold and 20-fold increase in the wear resistance of the TiN and TiO2-coated bearings was observed after 7.7x106 cycles at a load of 150 N and 600 rpm. The mechanism responsible for this improvement is thought to be the 3-body-contact between the bearing elements and the small TiN and TiO2 debris, coming from the worn coating layers. The maximum load capability of the non-coated, TiN-coated and TiO2-coated bearings were 150 N, 200 N and 600 N. It is concluded that the higher load capacity of the TiO2 compared to the TiN coatings is due to its lower coefficient of friction.

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Periodical:

Advanced Materials Research (Volume 566)

Pages:

308-312

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.566.308

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Online since:

September 2012

Authors:

Edson Costa Santos, Justyna Rozwadowska, Katsuyuki Kida, Takashi Honda, Koshiro Mizobe, Yuji Kashima, Ryo Matsumoto, Chun Guo

Keywords:

Laser Gas Nitriding, Q-sw Laser, Rolling Contact Fatigue (RCF), Titanium Alloy

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