Research on Lithium Niobate Piezoelectric Ceramics by Vacuum Hot-Pressing Sintering
Lithium niobate(LN)powder was sintered by vacuum hot-pressing sintering to prepare LN pie-zoelectric ceramics,with the optimal sintering parameters determined by changing the sintering tempera-ture and holding time.The density,microstructure,phase composition,piezoelectric and dielectric proper-ties of the sintered samples were tested.The results show that LN piezoelectric ceramics prepared under the conditions of a sintering temperature of 900 ℃,a holding time of 120 minutes,and a pressure of 35 MPa exhibit the highest density(4.62 g/cm3)and the maximum piezoelectric constant d33(8.7 pC/N).Com-pared with the methods of traditional solid-phase sintering and CO2 laser sintering,the piezoelectric con-stant of the prepared LN piezoelectric ceramics increases by 7.9 pC/N and 2.7 pC/N,respectively.When the test frequency is within 1 kHz～1 MHz,the dieletric constant of LN piezoelectric ceramics prepared un-der different conditions decreases rapidly and then tends to stabilize.
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