Vibration welding is one of the most commonly used welding techniques. It does not need external heat source to connect thermoplastic parts from injection parts to complex parts.The vibration at a given frequency is 100-250hz, and the amplitude is 0.5-2.5mm under pressure. Heat generated by friction and viscous dissipation causes the polymer to melt at the welding interface, extrude the molten polymer from the welding area, and connect the parts together.
Research on nano composite vibration welding is very rare, mainly concentrated in the nanoscale clay into power and nanometer titanium dioxide and silica nanoparticles such as reinforced thermoplastics, recent studies have investigated the influence of welding parameters, welding pressure, amplitude and filler content, on the welding strength of nanocomposites.
Due to its excellent mechanical properties, low density, high heat and electrical conductivity, carbon nanotubes are used as functional fillers in polymer-based composite welding materials for various applications, such as conductive polymers, structures and photovoltaic power generation.
Carbon nanotube enhanced efficiency depends largely on the choice of the polymer matrix, the enhancement of thermoplastics showed excellent mechanical properties, carbon nanotubes these high mechanical properties of polymers can be transferred to the vibration on the weld of injection parts for designers from simpler structure complex structure components is important.
The inclusion of nanometer organic clay significantly reduced the welding strength, and the increase of filler content resulted in a further decrease in the welding strength. Due to the unfavorable arrangement and accumulation of organic clay in the welding area, the welding strength of the nanocomposite was lower than that of the original polypropylene, especially under high welding pressure.
At present, there are few materials about vibration welding of nano-reinforced thermoplastics, and the influences of packing content and welding pressure on the strength of carbon nanotubes reinforced polyformaldehyde welding, as well as the interpretation of structure and property relationship still need to be studied.
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