Electroless Coating of Silver on Multiwall Carbon Nanotubes

Silver reinforced with carbon nanotubes, instead of graphite, would increase both the electrical conductivity, hardness and wear resistance of the electrical brush materials. The effective utilization of carbon nanotubes in the Ag/CNT composite depends strongly on its uniform distribution and strong interfacial adhesion to the silver matrix and thus demands for its surface modification. In order to carry out the surface modification of carbon nanotubes, electroless coating was given to them after liquid phase oxidation, sensitization and activation process. The room-temperature chemical treatment results in a nominally complete coating over the entire outer surface of multiwall carbon nanotube. The surface morphology of the carbon nanotubes after each step has been studied using TGA, DSC, XRD, FTIR and SEM.

Real-Time Monitoring System of Cutting Process Based on Cutting Temperature

Cutting temperature measurement and its variety tendency can reflect cutting tool performance and machined surface quality directly. By means of a mercury current collector or an electrical brush device the online measurement of thermoelectric potential of tool-workpiece natural thermocouple in milling is obtained, based on which a new cutting process real-time monitoring system is developed. The system takes the average cutting temperature in tool-workpiece interface as the monitoring target and the rotation rate of machine spindle as the adjustment object, which leaves out onerous and complex modeling and makes the monitoring and adjustment objective, direct and effective.