石墨粉镀银新工艺研究

研究了镀液中硝酸银浓度、石墨粉加入量和阴极电流密度等工艺条件对镀银石墨粉含银量和电镀效果的影响。用扫描电镜对镀银石墨粉的微观形貌和镀覆效果进行分析，通过X射线衍射仪对镀银石墨粉高温灼烧后的剩余物进行分析测试并计算镀银石墨粉的含银量。研究结果表明：采用惰性电极作为电镀阳极，在化学镀预处理过的石墨粉表面可成功镀覆一层银，其含银量达76%。     

提高预焙阳极质量措施与生产实践

阐述了"预焙阳极是铝电解生产的心脏"观念和铝电解对预焙阳极质量的要求,论述和分析了提高预焙阳极质量的条件和措施。从生产实践方面,进一步论证和加强了"优质原料是阳极质量的基础,工艺条件稳定是阳极质量的保证"的理念。     

石墨粉电镀法镀锌工艺研究

过电镀法使锌均匀沉积在预处理过的微米级鳞片石墨上,从而制得石墨／锌复合材料。研究了镀锌过程中镀锌工艺条件对电镀效果及镀锌石墨粉含锌量的影响。用扫描电镜对镀锌石墨粉的微观形貌进行分析,用X射线衍射仪对镀锌石墨粉850℃灼烧后的剩余物进行分析并推导出计算镀锌石墨粉含锌量的计算公式。研究结果表明：采用电镀法可在预处理过的微米级鳞片石墨粉表面成功镀覆上一层均匀致密的单质锌,镀锌石墨粉的含锌量70wt％以上。     

Wear property of high-resistivity carbon brushes made with and without MoS2 in variable humidity

Four kinds of high-resistivity carbon brushes with MoS2 contents of 0%, 2%, 4% and 6% （mass fraction） were prepared, respectively. Wear tests of brushes were conducted on an alternate current（AC） motor. Scanning electron microscopy（SEM） and energy dispersive X-ray analysis（EDS） were used to analyze the worn surface of brushes, and a thermocouple was used to measure the bulk temperature of the brush. The results show that wear rate of brush made without MoS2 in 10% relative humidity（RH） is two times larger than that in 50% RH, whereas the wear rates change little for the brushes made with MoS2. The wear of brushes has much to do with the surface film. In low humidity, the surface film can not be formed for the former brush while a sulfur layer can be formed for the latter brushes, which can reduce sparks, frictional heat and wear rate, and play a role like the water film in high humidity.     

炭石墨材料/铜滑动摩擦的理论研究和电刷磨损的影响因素

综述了与炭石墨材料／铜滑动摩擦相关的吸附润滑理论、氧化膜润滑理论、通电磨损理论、电接触理论、换向理论和炭石墨材料疲劳磨损机理理论，并对电刷磨损的影响因素进行了探讨。指出了滑动摩擦理论存在的不足之处，有待完善，对此的进一步研究必将对改进滑动摩擦材料的生产工艺、提高产品性能产生重要的影响。     

Preparation of carbon brushes with thermosetting resin binder

Carbon brushes with a resin binder were prepared according to an industrial process and the effects of the molding pressure, grains size and cure temperature on the properties of brush samples were discussed. The results show that the bulk density, bending strength and Rockwell hardness increase, while resistivity decreases with increasing molding pressure. Cure temperature has much more influence on the properties of brushes than molding pressure and grains size. Isothermal differential scanning calorimetry（DSC） was used to estimate the degree of cure of resin binder and a novel method of using the true density to measure the degree of cure of resin binder was presented and discussed briefly. Based on optimal process parameters carbon brushes were manufactured, durability tests for brushes were carried out on an alternate current motor and scanning electron microscope（SEM） was adopted to observe the morphology of worn surface of brushes. The results show that a luster oxide film can be formed on the surface of brushes and their service life reaches 380 h.     

石油焦细粉煅烧研究

目前石油焦细粉含量越来越高,已严重影响了预焙阳极煅烧、配料等生产过程,选用不同于煤沥青的4种黏结剂对石油焦细粉进行成型、煅烧等工艺处理,并分析了真密度、粉末电阻率、强度、热稳定性等性能。实验结果表明,本研究能改善细粉含量过高石油焦的煅烧质量。     

刷体温度对高速微电机电刷磨损性能的影响

采用自制焙烧型电刷和进口高阻电刷在交流串激式高速微电机进行电刷磨损性能测试，并对电刷刷体温度进行了测量，考察了电刷刷体温度与电刷磨损速率的关系，运用相关理论对刷体温度、对电刷磨损性能的影响进行了详细分析。研究结果表明，电刷刷体温度的高低对电刷的磨损性能具有决定性的影响，刷体温度越高，电刷磨损越快。刷体温度可以作为考察高速微电机电刷磨损性能重要的指标参数。     

预焙阳极氧化机理与提高抗氧化性主要方法

综述了预焙阳极氧化机理以及石油焦原料空气反应性和二氧化碳反应性能,分析和指出了阳极抗氧化性差对铝电解过程的影响和危害,同时对提高阳极抗氧化性能的主要方法与措施进行了讨论.