Views:7 Author:Site Editor Publish Time: 2018-02-04 Origin:Site
Effects of porous PZT piezo ceramics performance
The effect of calcination temperature is on the properties of porous PZT piezo ceramic membrane.The PZT powder was made into a sheet-like ceramic membrane by dry pressing. The micro structure of the porous PZT ceramic membrane piezoelectric used for underwater communication under different calcining temperature is shown in Fig. From the SEM results, it can be seen that the PZT ceramic membranes are porous structure at the calcination temperatures. With the calcination temperature is gradually increasing, the PZT material piezo crystal between the PZT particles and the neck increases, and the porosity of the piezo ceramic membrane gradually decreases. The PZT piezoelectric ceramics transducers was pressed into 50 mm×6 mm×6 mm spline and calcined at different temperatures. The influence of calcination temperature on the mechanical strength of the spline was investigated. With the calcination temperature increasing, the mechanical strength of the piezoelectric materials disc gradually increased from 21.6 MPa at 900°C to 83.6 MPa at 1100 °C. The microstructure of the porous PZT ceramic surface shows that with the increase of calcination temperature, the neck of PZT powder is strengthened and the mechanical strength of the porous ceramic membrane is improved.Porosity and pure water permeability of porous PZT ceramic membranes calcined at different temperatures were tested. Porosity of porous PZT piezo bimorph actuator membranes gradually decreased with increasing calcination temperature from 33.4% at 900 ℃ to 1100 ℃ 16.4%, which is caused by the piezo bimorph actuator for igniter by the increase of calcination temperature, and the permeability of pure water also decreases from about 1100 at 900 ℃ to 1100 ℃. Considering the mechanical strength, porosity and pure water permeability of porous PZT ceramic membrane, the calcination temperature was chosen to be 950 ℃. The PZT ceramic had a mechanical strength of 47.8 MPa and a porosity of 34% pure water permeability is 850. The pore size distribution of the porous piezoelectric tube actuator prepared under these conditions has a narrow pore size distribution and an average pore diameter of about 300 mm with no macropore defects.