کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
617734 | 1455000 | 2013 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Sliding wear behavior of copper alloy impregnated C/C composites under an electrical current Sliding wear behavior of copper alloy impregnated C/C composites under an electrical current](/preview/png/617734.png)
The wear behavior of copper-impregnated carbon fiber reinforced carbon composites (C/C composites) was investigated using a block-on-ring type wear tester during application of a DC electrical current. Three types of C/C composite contact strip materials were tested. The wear test was carried out at a constant sliding speed of 55.6 m/s with a normal load of 59 N, and applied electrical currents ranging from 100 to 500 A. The arc-discharging rate, which is defined as the ratio of arc-discharging time to total sliding time, ranged from 0% to 35%. We also investigated the thermal and oxidation properties of the C/C composites with the laser flash method and TG-DTA. The results of the wear experiments indicate that the wear of copper-impregnated C/C composite contact strips was proportional to the arc discharge energy, which can be calculated from measurements of contact voltage and electrical current. The C/C composite contact strips with high strength carbon fiber were more likely to wear under high arc discharge energy conditions. The C/C composites made of higher strength carbon fiber have lower thermal conductivities and were more likely to be pyrolyzed or degraded by oxidation than the C/C composite with lower strength carbon fiber. These differences are thought to contribute to the difference in the wear behavior.
Journal: Wear - Volume 302, Issues 1–2, April–May 2013, Pages 1492–1498