A physical model for degradation of drams during accelerated stress ageing : Anant G. Sabnis and James T. Nelson. IEEE 21st Ann. Proc. Reliab. Phys. 90 (1983)

Abstract

To clarify the influence of nano-graphite (NG) on the comprehensive performances of Nano-graphite/PZT-PMN-PNN/RTV composites, composites with damping-absorption performances and storage-loss behaviors based on Room Temperature Vulcanizing silicone rubber (RTV), PZT matrix ceramics, NG as conductive agent were fabricated employing three steps methods of ball-milling, three-roller milling and pressing. The effects of NG on storage, loss and damping properties were investigated by the method of DMTA. Absorption and mechanical performances are measured by the method of standing wave tube and TG. The morphologies, chemical and phase structures of composites are characterized by SEM, XRD and IR. The research indicated that both doping of NG and the combination of PZT-PMN-PNN/RTV can be proposed to improve greatly the comprehensive performance of RTV matrixes. There would be more excellent comprehensive properties in NG/PZT-PMN-PNN/RTV composites as increasing rate of 65% in d33, storage modulus of 3010 MPa, loss modulus of 205 MPa, and damping coefficient tanδ of 0.26 and, absorption coefficients of 0.6–0.7 with the frequency of 400–1600 Hz. Also, the improvement in NG amounts for composites can lead to the enforcement of stress for NG/ZT-PMN-PNN/RTV composites, but it caused neither the preferential growth in any a single crystal surface, nor the appearance of solid solution.