| LI Jia-jia,WANG Yan,WANG Fu-hui.Study on Mechanical and Tribological Behavior of Copper-based Self-lubricating Composites Prepared at Different Ball Mill Time[J],50(9):236-243 |
| Study on Mechanical and Tribological Behavior of Copper-based Self-lubricating Composites Prepared at Different Ball Mill Time |
| Received:December 04, 2020 Revised:March 18, 2021 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2021.09.024 |
| KeyWord:WS2/Cu composites ball milling time self-lubricating spark plasma sintering mechanical properties wear rate friction coefficient |
| Author | Institution |
| LI Jia-jia |
Northeastern University Joint Research Branch, Shenyang National Research Center for Materials Science, Shenyang , China |
| WANG Yan |
Northeastern University Joint Research Branch, Shenyang National Research Center for Materials Science, Shenyang , China |
| WANG Fu-hui |
Northeastern University Joint Research Branch, Shenyang National Research Center for Materials Science, Shenyang , China |
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| Abstract: |
| Thework aims to study the effect of ball milling time on the interface state of Cu-WS2 self-lubricating composites, and at the same time improving the mechanical properties and friction and wear properties of self-lubricating materials, and proposes a more optimized preparation process of Cu and WS2 composites.The copper-based self-lubricating composite material was prepared by high-energy ball milling and spark plasma sintering technology. The mechanical experiment was carried out by the WDW-100 electronic universal testing machine. The tribological experiment was carried out by the American Rtec multifunction friction and wear tester. The phase composition and microstructure of WS2/Cu composite powders with different milling time and sintered bulk composites were characterized by XRD and SEM. And combined with EDS, the morphology and wear morphology of the bending fracture were characterized, and the internal relationship between the ball milling time and the interfacial state-mechanical properties-friction and wear properties of the composite material was analyzed. The results indicate that as the ball milling time is 30 h, WS2 particles have a better combination and distribution in the copper matrix, and the overall performance of the materials is the best. The mechanical properties of the WS2/Cu composite are good, and the average friction coefficient is 0.186, which is maintained at a low level. The wear rate is the lowest at 7.11×10–5 mm3/(N.m). Moreover, as the milling time exceeds 30 h, the wear rate is no longer consistent with the mechanical properties, and increases with the prolonging of the milling time. When the ball milling time reaches 50h, the wear resistance of the matrix decreases and the wear rate increases significantly, reaching the maximum value of 10.39×10–5 mm3/(N.m). The extension of the milling time will increase the dispersion of WS2 in the matrix, and the mechanical interlocking physical combination of WS2 and Cu matrix will enhance the mechanical properties. In addition, the friction and wear performance can also be maintained at a good level. But when the milling time exceeds 30 h, the interfacial reaction intensifies and WS2 decomposes into Cu2S, which greatly weakens the lubrication and antifriction properties of WS2, and reduces the friction and wear properties of the composite material. |
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