BCTZ-based perovskite system multi-component lead-free piezoelectric ceramic and preparation method thereof
A lead-free piezoelectric and perovskite technology, which is applied in the field of ceramic compositions, can solve the problems of high pre-sintering sintering temperature, unstable sintering performance, and difficulty in densification during sintering, so as to achieve cost reduction, stable piezoelectric performance, and low Effect of sintering and pre-firing temperature
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[0026] Example 1
[0027] The BCTZ-based perovskite system multi-element lead-free piezoelectric ceramic of the present invention has the raw material components and the mole percentages of (1-y)[(1-x)Ba(Zr 0.2 Ti 0.8 )O 3 -x(Ca 0.7 Ca 0.3 )O 3 ]-y[(Na 0.52 K 0.44 Li 0.04 )(Nb 0.88 -Sb 0.08 Ta 0.04 )O], where x=0.40~0.50, y=0.001~0.05;
[0028] This embodiment can be divided into two components:
[0029] ①(Ba,Ca)(Ti,Zr)O 3 , Referred to as BCTZ, namely (1-x)Ba(Zr 0.2 Ti 0.8 )O 3 -x(Ca 0.7 Ca 0.3 )O 3 , Where x=0.48.
[0030] ②(Na 0.52 K 0.44 Li 0.04 )(Nb 0.88 Sb 0.08 Ta 0.04 )O 3 , Referred to as KNNLST.
[0031] The preparation steps are as follows:
[0032] (1) Use BaCO 3 , CaCO 3 , ZrO 2 , TiO 2 The ingredients are weighed according to the stoichiometric ratio, the prepared raw materials are ball milled in absolute ethanol medium for 6 hours, dried at 100°C, kept for 2 hours, and then pre-fired at 1100°C for 2 hours to obtain BCTZ powder.
[0033] (2) Use Li 2 CO 3 , K 2 CO 3 , Na 2 CO...
Example Embodiment
[0053] Example 2
[0054] (Ba,Ca)(Ti,Zr)O of this embodiment 3 (BCTZ) component is (1-x)Ba(Zr 0.2 Ti 0.8 )O 3 -x(Ca 0.7 Ca 0.3 )O 3 , Where x=0.45. The other component is (Na 0.52 K 0.44 Li 0.04 )(Nb 0.88 Sb 0.08 Ta 0.04 )O 3 .
[0055] Use analytical grade BaCO 3 , ZrO 2 , TiO 2 And 98.0 CaCO 3 , Carry out the ingredients according to the stoichiometric ratio of BCTZ, mill the prepared ingredients in anhydrous ethanol medium for 6 hours, dry at 100°C, keep them for 2 hours, and then pre-burn at 1000°C and keep them for 2 hours to obtain BCTZ powder. Use Li 2 CO 3 , K 2 CO 3 , Na 2 CO 3 , Nb 2 O 5 , Ta 2 O 5 And Sb 2 O 3 According to the stoichiometric ratio of KNNLST, the prepared material is ball milled in anhydrous ethanol medium for 6 hours, dried at 100°C, kept for 2 hours, and then pre-fired at 850°C for 2 hours to obtain KNNLST powder. Weigh the BCTZ and KNNLST powders according to (1-y)BCTZ-yKNNLST (y=0.05), ball mill them in anhydrous ethanol medium for 6 hours, dry at 10...
Example Embodiment
[0059] Example 3
[0060] (Ba,Ca)(Ti,Zr)O of this embodiment 3 (BCTZ) component is (1-x)Ba(Zr 0.2 Ti 0.8 )O 3 -x(Ca 0.7 Ca 0.3 )O 3 , Where x=0.40. The other component is (Na 0.52 K 0.44 Li 0.04 )(Nb 0.88 Sb 0.08 Ta 0.04 )O 3 .
[0061] Use BaCO 3 , CaCO 3 , ZrO 2 , TiO 2 According to the stoichiometric ratio of BCTZ, the mixed materials are ball milled in anhydrous ethanol medium for 6 hours, dried at 100°C, kept for 2 hours, and then pre-fired at 1100°C for 2 hours to obtain BCTZ powder. Use Li 2 CO 3 , K 2 CO 3 , Na 2 CO 3 , Nb 2 O 5 , Ta 2 O 5 And Sb 2 O 3 According to the stoichiometric ratio of KNNLST, the prepared material is ball milled in anhydrous ethanol medium for 6 hours, dried at 100°C, kept for 2 hours, and then pre-fired at 850°C for 2 hours to obtain KNNLST powder. Weigh BCTZ and KNNLST powders according to (1-y)BCTZ-yKNNLST (y=0.015), ball mill them in anhydrous ethanol medium for 6 hours, dry at 100°C, and keep them warm for 2 hours to obtain 0.985BCTZ-0.015KNNL...
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