Study On Preparation And Properties Of Piezoelectric-damping/Epoxy Composites

The noise and vibration bring by the Large mechanized has been drawing people’shighly attention. Piezoelectric damping material is a new research hotspot in new dampingmaterials field because of its specific energy loss mechanism. In this thesis,2-2and1-3piezoelectric damping composites were fabricated by cut-filling method using epoxy resin asmatrix and PZT-51as functional filler. The carbon nanotubes(CNTs) and carbon fibers(CFs)were added to1-3piezoelectric damping composites, hoping to improve some properties. Thepiezoelectric and dielectric properties, as well as the morphology of the as-prepared materialswere studied, and some influencing factors on damping property were discussed. The studiesprovided experimental basis for the development and application of the piezoelectric dampingcomposites.The impacts of volume fraction and shape parameter on the performances of2-2piezoelectric damping composites were studied. The results indicate that the value of d33andεrof the composite increase with the increase of the PZT-51content. The damping propertyachieves the best when the volume fraction of PZT-51is50%. The value of tanδmaxreaches0.712, which is66%higher than that of epoxy resin. The value of d33and εrof the compositechange little and tanδmaxdecreases with the increase of the width-thickness ratio. tanδmaxachieves the highest value as0.728when the width-thickness ratio of the ceramic is13.3%,which is70%higher than that of epoxy resin. At the same time, TA reaches the maximumvalue as18.798.The influence factor of PZT-51volume fraction, ceramic width-thickness ratio and theinclination of the ceramic column on the performances of1-3piezoelectric dampingcomposites were studied. The results indicate that the value of d33and εrof the compositeincrease with the increase of the PZT-51volume fraction. TA and tanδmaxachieve their highestvalue when the volume fraction of PZT-51is21.2%. The value of d33and εrof the compositechange little and tanδmaxdecreases with the increase of the width-thickness ratio. Thedamping property achieves the best when when the width-thickness ratio of the ceramic is16.7%.The value of d33,εrand tanδmaxof the composite decrease with increasing the inclination of the ceramic column. tanδmaxof1-3piezoelectric damping composites is lowerthan that of epoxy resin when the inclination of the ceramic column is above30°.The influences of the content of CNTs and CFs on the performances of1-3piezoelectricdamping composites were studied. The results indicate that with the increase of the content ofCNTs and CFs, d33changes little and εrincreases. When CNTs content is1%, tanδmaxachieves0.615and ΔT gets to19.97°C. When the content of CFs is8%, tanδmaxand ΔTachieve their highest value and the damping property is good.The SEM images for the impact-fractured surface of the1-3and2-2piezoelectricdamping composites were observed. It can be seen that ceramic and epoxy resin combinedwell and CNTs and CFs uniformly distribute in epoxy resin. The conductive networks havebeen formed when the CNTs content reaches1-1.5Per100g epoxy or the CFs content reaches6-8Per100g epoxy.