The effect of sulfonated graphene oxide on the current-carrying wear characteristics of a resin matrix carbon brush
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摘要: 以磺化石墨烯共混包覆的天然鳞片石墨粉为导电填料，改性酚醛树脂作为粘结剂，采用分步分散、热轧片、二次造粒等工艺制得新型树脂基炭刷材料。采用Z1E-QC8-110石材切割机测试其载流磨损性能，利用XRD、SEM、EDS、TEM等表征手段对磺化石墨烯改性前后的鳞片石墨粉及其炭刷制品的磨损面进行微观结构分析。结果表明，经磺化石墨烯改性的鳞片石墨粉呈现出"搭接桥联"状态，且其制成的炭刷材料的磨痕区域呈现"互联粘附"状态。在同为220 V的加载电压下，含磺化石墨烯的炭刷载流磨损率为2.06×10-7mg·N-1·m-1，约是未含磺化石墨烯炭刷的31.3%，其抗磨性明显优于后者。树脂基炭刷/铜的磨损机理主要是电侵蚀磨损、氧化磨损和粘着磨损的交互作用。Abstract: A novel resin matrix carbon brush (RMCB) was prepared by dispersing sulfonated graphene oxide (SGO) and flake graphite powder into a phenolic resin alcohol solution, followed by drying, hot rolling, pulverization, cold pressing and solidification by heat treatment. The current-carrying wear performance of the RMCB was tested by using it in a heavy-duty industrial motor at different on-load voltages from 200 to 240 V for 4 h and examining it after use. The microstructure was characterized by XRD, SEM, EDS and TEM. Results show that the flake graphite particles were bridged by SGO and the ground surface of the brush exhibited an interconnected carbon structure. The wear rate of the RMCB with SGO was 2.06×10-7 mg·N-1·m-1 at 220 V, which was 31.3% of that of the RMCB without SGO. The combined action of arc erosion wear, oxidative wear and adhesive wear was the dominant wear mechanism of the brush with and without SGO during the current-carrying wear test.
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Key words:
- Resin matrix carbon brush /
- Sulfonated graphene /
- Wear with current /
- Microstructure
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