Tribological properties of polyoxymethylene (POM) composites containing a trace amount of silicon carbide (SiC) and/or calcium salt of octacosanoic acid (Ca-OCA) as well as containing polytetrafluoroethylene (PTFE) were investigated by means of a pin-on-disk type wear apparatus. The spherulite size of POM composites was measured using a polarizing microscope. Mechanical properties and gear performance of the composites were also evaluated. It was found that the coefficient of friction was drastically lowered due to the lubricant effect of Ca-OCA added to POM/SiC composites. Further, the wear rate was also decreased by the nucleating effect of SiC and Ca-OCA. Especially, POM/SiC(0.1)/Ca-OCA(1) composite containing SiC 0.1 wt.% and Ca-OCA 1 wt.% showed the coefficient of friction as low as that of POM/PTFE(24) composite containing PTFE 24 wt.%, keeping higher wear resistance. Also, its mechanical properties were found to be the same level as those of unfilled POM, except that its izod impact strength became higher than that of unfilled POM. Furthermore, its gear performance was confirmed to be satisfactory without generating noise under the dry running condition, when the same gears were combined below 13 MPa of bending stress. [S0742-4787(00)00304-0]
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October 2000
Technical Papers
Tribological Properties and Gear Performance of Polyoxymethylene Composites
Masaya Kurokawa,
e-mail: kuroka@nihonkai.kanazawa-u.ac.jp
Masaya Kurokawa
Graduate School of Natural Science and Technology, Kanazawa University, 40-20, Kodatsuno 2-chome, Kanazawa-shi, Ishikawa 920-8667, Japan
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Yoshitaka Uchiyama,
Yoshitaka Uchiyama
Department of Mechanical Systems Engineering, Kanazawa University, 40-20, Kodatsuno 2-chome, Kanazawa-shi, Ishikawa 920-8667, Japan
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Susumu Nagai
Susumu Nagai
Tribosystem Laboratory Starlite Co. Ltd., 1-1-71 Tokuan, Tsurumi-ku, Osaka 538-0034, Japan
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Masaya Kurokawa
Graduate School of Natural Science and Technology, Kanazawa University, 40-20, Kodatsuno 2-chome, Kanazawa-shi, Ishikawa 920-8667, Japan
e-mail: kuroka@nihonkai.kanazawa-u.ac.jp
Yoshitaka Uchiyama
Department of Mechanical Systems Engineering, Kanazawa University, 40-20, Kodatsuno 2-chome, Kanazawa-shi, Ishikawa 920-8667, Japan
Susumu Nagai
Tribosystem Laboratory Starlite Co. Ltd., 1-1-71 Tokuan, Tsurumi-ku, Osaka 538-0034, Japan
Contributed by the Tribology Division for publication in the ASME JOURNAL OF TRIBOLOGY. Manuscript received by the Tribology Division October 5, 1999; revised manuscript received March 1, 2000. Associate Technical Editor: T. C. Ovaert.
J. Tribol. Oct 2000, 122(4): 809-814 (6 pages)
Published Online: March 1, 2000
Article history
Received:
October 5, 1999
Revised:
March 1, 2000
Citation
Kurokawa, M., Uchiyama, Y., and Nagai, S. (March 1, 2000). "Tribological Properties and Gear Performance of Polyoxymethylene Composites ." ASME. J. Tribol. October 2000; 122(4): 809–814. https://doi.org/10.1115/1.1288773
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