| 摘要: |
| 采用脉冲电刷镀的方法，制备了镍/碳纳米管（Ni/CNTs）复合镀层。运用扫描电子显微镜（SEM）、X射线能谱分析仪（EDS）、透射电子显微镜（TEM）、球盘式磨损试验机、显微硬度计等分析与测试方法，研究了脉冲关断时间对Ni/CNT复合镀层的表面形貌、孔隙率、CNTs含量、显微硬度和耐磨性等的影响。结果表明：在直流电源下，由于导电性和准一维性碳纳米管的共沉积，复合镀层表面粗糙，孔隙率高。采用脉冲电源后，当脉冲关断时间增加至1 900 μs时，复合镀层的表面平整度增加、孔隙率减小为1 %、硬度增加为605 HV、磨损重量减小1/3。 |
| 关键词: 碳纳米管 电刷镀 复合镀层 脉冲电流 耐磨性 |
| DOI： |
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| 基金项目:*国家自然科学基金重点项目（50235030）；装备再制造技术国防科技重点实验室基金(项目编号略)；武器装备预研基金(项目编号略) |
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| The Effect of Pulse Time-off on the Microstructure and Properties of Ni/CNTs Composite Coating by Brush Plating |
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Tan Jun, Yu Tian-tian, Xu Bin-shi, Yao Qiong, Guo Wen-cai, Yang Hong-jun
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National Key Laboratory for Remanufaturing, Beijing 100072 China
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| Abstract: |
| The Ni/CNTs composite coatings were prepared by brush plating with pulse current. The SEM, EDS and TEM were applied to investigate the morphology, porosity and the CNTs contents of composite coating. The hardness and wear weight loss of the composite coating were examined on a micro hardness tester and ball on disk tribotester. The results showed that under direct current, the Ni/CNTs composite coating is of a coarse surface with high porosity for the codeposition of conductive and quasi one dimensional carbon nanotubes. Under pulse current, when the pulse off time reached to 1 900 μs, the composite coatings more smooth surface, the porosity decreased to 1 %, the hardness increased to 605HV and the wear weight loss decreased to 1/3. |
| Key words: CNTs brush plating composite coating pulse current wear resistance |
