Phase structures, loss, storage, damping, voice-absorption, and mechanical properties: nano-carbon black/BWZT/RTV

Abstract

The objective of this work is to characterize the effect of NCB(Nano-carbon black)on the comprehensive performances and micro, chemical and phase structures of NCB/BWZT/RTV composite [BWZT is Ba (W 1/2 Cu 1/2 )O 3 -Pb 0.98 Sr 0.02 (Mg 1/3 Nb 2/3 ) 0.275 (Ni 1/3 Nb 2/3 ) 0.10 (Zr 0.25 Ti 0.375 ) O 3 and, RTV is Room Temperature Vulcanizing silicone rubber.]. Composites with damping-absorption performances and storage-loss behaviors based on RTV, BWZT and, NCB as conductive agent were fabricated employing three steps methods of ball-milling, three-roller milling and pressing. The effects of NCB and its amount on storage, loss and damping properties were investigated by the method of DMTA and, absorption and mechanical performances are measured by the methods of standing wave tube and TG separately. The micro, chemical and phase structures of composites are characterized by SEM, XRD and IR. The results indicated that both doping of NCB and the combination of BWZT and RTV can be proposed to improve greatly the comprehensive performance of RTV matrixes and, there would be more excellent comprehensive properties in NCB/BWZT/RTV composites with amount of 4 wt. %.-6wt. % for NCB as d 33 of 81 pC/N, storage modulus of 25003MPa, loss modulus of 398MPa, damping coe cient of 0.07-0.12, and absorption coe cients of 0.45-0.55 with the difference of frequency in the range of 400-1600Hz. Also, the lattice growth of BWZT is found showing strong dependences on the contents of NCB and, the absorption and damping performance of composites on frequency and temperature separately.