Synthesis and tribological properties of copper matrix solid self-lubricant composites reinforced with NbSe2 nanoparticles
✍ Scribed by Hua Tang; Kesheng Cao; Qiong Wu; Changsheng Li; Xiaofei Yang; Xuehua Yan
- Publisher
- John Wiley and Sons
- Year
- 2011
- Tongue
- English
- Weight
- 356 KB
- Volume
- 46
- Category
- Article
- ISSN
- 0232-1300
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✦ Synopsis
Copper matrix solid self-lubricant composites were prepared by powder metallurgy route using copper powders and NbSe 2 nanofiber or sheet. The tribological properties of the as-prepared materials were estimated by a ball-on-disc on UMT-2 multi-function friction and wear tester under dry conditions in a normal laboratory atmosphere (55-70% relative humidity, 15-25 °C). The NbSe 2 nanofiber or sheet was very effective in improving the tribological properties of the composites. It is found that the composites with 15 wt.% NbSe 2 nanofibers showed a very low coefficient of friction of 0.1487. Furthermore, the value levels of electrical resistivity for the composites with different contents of NbSe 2 nanofiber reached to 10 -6 Ω.cm. When the NbSe 2 content was high enough, a continuous supply of NbSe 2 nanofiber to the tribo-surface is an important precondition and the benefit of its anti-friction properties for the copper matrix composites. This behavior is related that little NbSe 2 is reacted with the Cu-base in the sintering process, although there needs enough NbSe 2 nanofibers as solid lubricants; too much NbSe 2 nanofibers will decrease the intensity of the composites, reducing the wear resistance. So adding the appropriate contents of NbSe 2 nanofiber to the composites play an important role in anti-friction and wear resistance.