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Technical Brief

On the Sliding Wear Behavior of PAEK Composites in Vacuum Environment

[+] Author and Article Information
Géraldine Theiler

Bundesanstalt für Materialforschung und-prüfung,
BAM,
Berlin 12203, Germany
e-mail: Geraldine.theiler@bam.de

A. P. Harsha

Department of Mechanical Engineering,
Indian Institute of Technology (Banaras Hindu University),
Varanasi 221 005, India

Thomas Gradt

Bundesanstalt für Materialforschung und-prüfung,
BAM,
Berlin 12203, Germany

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received June 19, 2018; final manuscript received December 4, 2018; published online January 25, 2019. Assoc. Editor: Min Zou.

J. Tribol 141(4), 044502 (Jan 25, 2019) (7 pages) Paper No: TRIB-18-1234; doi: 10.1115/1.4042271 History: Received June 19, 2018; Revised December 04, 2018

In the present study, the tribological behavior of polyaryletherketones (PAEKs) and their composites was investigated in air and vacuum environment. Polymer matrices were filled with either glass or carbon fibers and compared with a standard bearing material containing 10% carbon fiber (CF), 10% graphite, and 10% polytetrafluoroethylene (PTFE). The samples were tested in a pin-on-disk configuration under continuous sliding against a rotating steel disk (AISI 52100) at different sliding speeds. The results indicated that the tribological performance of these materials in vacuum depends on both compositions and test conditions. At low sliding speed, a very low friction and wear coefficients were obtained while at higher speed, severe wear occurred. In particular, CF filled composites showed excessive wear that led to the ignition after opening the vacuum chamber. Experimental results are discussed by analyzing the transfer film and wear debris.

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References

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Figures

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Fig. 1

Melting (Tm) and glass transition temperatures (Tg) of various polyaryletherketones as a function of the ether/ketone ratio [7]

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Fig. 2

The chemical structures of PEEK and PEKK

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Fig. 3

Variation of COF with time (h) for neat PEEK and PEKK in air and in vacuum conditions (at 10−2 m bar and <10−5 m bar) at the sliding velocity of 0.2 m/s

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Fig. 4

Average COF (a) and specific wear rates (b) of PEEK and PEKK materials at 0.2 m/s in air and high vacuum (<10−5mbar)

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Fig. 5

Variation of COF with time (h) for neat PEEK and PEKK at 1 m/s in air and high vacuum conditions

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Fig. 6

Coefficient of friction (a) and specific wear rates (b) of PEEK and PEKK composites at 1 m/s in air and high vacuum conditions

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Fig. 7

Optical micrographs of the steel disk surfaces operated at the sliding velocity of 0.2m/s against (a) PEEK in air, (b) PEEK in high vacuum (low friction), (c) PEKK in air, (d) PEKK in high vacuum, (e) PEEK in low vacuum, and (f) PEEK in high vacuum (high friction)

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Fig. 8

Optical micrographs of the steel disk surfaces operated at the sliding velocity of 0.2m/s against (a) PEEKCF and (b) PEKKCF in air and (c) PEEKCF and (d) PEKKCF in high vacuum condition

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Fig. 9

Optical micrographs of (a) PEEKCF and (b) PEKKCF after testing in the high vacuum condition at the sliding velocity of 0.2 m/s

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Fig. 10

Raman spectra of the PEEKCF transfer film after testing in air and high vacuum

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Fig. 11

Transfer film of PEEK/CF/TF/Gr after testing in vacuum (a) 0.2 m/s and (b) 1 m/s

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Fig. 12

(a) Transfer film of PEEKCF after testing at 1 m/s in vacuum and (b) ignition of wear debris after opening of the vacuum chamber

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