Effect of Glass Doping and Sintering Process on BCZT Piezoelectric Ceramics
(Ba0.85Ca0.15)(Ti0.9Zr0.1)O3(BCZT)and BCZT lead-free piezoelectric ceramics doped with Al-Mg-Ca glass powder were prepared using the traditional solid-state reaction method.This study first investigated the influence of pre-sintering temperature on BCZT ceramic powder,followed by studying the influence of doping Al-Mg-Ca glass powder on the sintering,dielectric and piezoelectric properties of BCZT lead-free piezoelectric ceramics.Finally,the sintering process was determined by an orthogonal test.The results show that the optimal pre-sintering temperature for BCZT powder was 1100 ℃.Doping Al-Mg-Ca glass powder effectively reduced the sintering temperature of BCZT ceramics.The optimum sintering process was obtained by an orthogonal experiment:pre-firing at 1100 ℃,sintering at 1350 ℃,heating rate of 2 ℃/min,a holding time of 7 h,cooling to 800 ℃ in 110 min.The results obtained by verifying the orthogonal test are that the dielectric constant at the Curie temperature point of BCZT ceramics doped with Al-Mg-Ca glass powder is 12228,and the piezoelectric constant d33 is 425 pC/N.
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