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Potassium-sodium niobate-based leadless piezoelectric ceramic and preparation method thereof
The invention discloses a potassium niobate-based leadless piezoelectric ceramic and a preparation method thereof. The stoichiometric ratio of the potassium niobate-based leadless piezoelectric ceramic is (1-x) K 0.48 Na 0.52 NbO 3-x (NaSbO 3 +(Bi 0.45 Sm0.05) Li 0.5 ZrO3), wherein x is equal to 0, 0.01, 0.02, 0.03, 0.04, 0.05 and 0.06. The preparation method comprises the following steps of: weighing K2CO3, Na2CO3, Li2CO3, Nb2O5, Sb2O5, Bi2O3, Sm2O3 and ZrO2 according to a stoichiometric ratio; carrying out batching; carrying out ball milling and drying; carrying out presintering at 870 DEG C for 6 h to obtain presintered powder; carrying out secondary ball milling, drying, granulation, tabletting and glue discharging; carrying out sintering at 1080-1120 DEG C; and finally carrying out silver coating and polarization operation to prepare the ceramic chip with a relatively high piezoelectric constant. According to the method of the invention, (NaSbO3+(Bi0.45 Sm0.05) Li 0.5 ZrO3) is doped in KNN-based leadless piezoelectric ceramic, and the sintering process is improved, so that the electrical properties of the piezoelectric ceramic are improved, the dielectric constant epsilon r is 2000, the Curie temperature TC is 267 DEG C, and the piezoelectric constant d33 is 340 pC/N.
本发明公开了一种铌酸钾基无铅压电陶瓷及其制备方法，所述铌酸钾钠基无铅压电陶瓷的化学计量比为：(1‑x)K0.48Na0.52NbO3‑x(NaSbO3+(Bi0.45Sm0.05)Li0.5ZrO3)，其中x=0，0.01，0.02，0.03，0.04，0.05，0.06。制备方法是将 K2CO3，Na2CO3，Li2CO3，Nb2O5，Sb2O5，Bi2O3，Sm2O3，ZrO2，这几种原料按照化学计量比称量好，进行配料，经过球磨、烘干后在870℃预烧6h得到预烧粉，再经过二次球磨、烘干、造粒、压片、排胶后，在1080‑1120℃下烧结，最后经过被银和极化操作后，制得较高压电常数的陶瓷片。本发明通过将 (NaSbO3+(Bi0.45Sm0.05)Li0.5ZrO3)掺杂在KNN基无铅压电陶瓷中，并对烧结工艺进行改进，提高了该压电陶瓷电学性能，其介电常数εr=2000，居里温度TC=267℃，压电常数d33=340pC/N。
Potassium-sodium niobate-based leadless piezoelectric ceramic and preparation method thereof
The invention discloses a potassium niobate-based leadless piezoelectric ceramic and a preparation method thereof. The stoichiometric ratio of the potassium niobate-based leadless piezoelectric ceramic is (1-x) K 0.48 Na 0.52 NbO 3-x (NaSbO 3 +(Bi 0.45 Sm0.05) Li 0.5 ZrO3), wherein x is equal to 0, 0.01, 0.02, 0.03, 0.04, 0.05 and 0.06. The preparation method comprises the following steps of: weighing K2CO3, Na2CO3, Li2CO3, Nb2O5, Sb2O5, Bi2O3, Sm2O3 and ZrO2 according to a stoichiometric ratio; carrying out batching; carrying out ball milling and drying; carrying out presintering at 870 DEG C for 6 h to obtain presintered powder; carrying out secondary ball milling, drying, granulation, tabletting and glue discharging; carrying out sintering at 1080-1120 DEG C; and finally carrying out silver coating and polarization operation to prepare the ceramic chip with a relatively high piezoelectric constant. According to the method of the invention, (NaSbO3+(Bi0.45 Sm0.05) Li 0.5 ZrO3) is doped in KNN-based leadless piezoelectric ceramic, and the sintering process is improved, so that the electrical properties of the piezoelectric ceramic are improved, the dielectric constant epsilon r is 2000, the Curie temperature TC is 267 DEG C, and the piezoelectric constant d33 is 340 pC/N.
本发明公开了一种铌酸钾基无铅压电陶瓷及其制备方法，所述铌酸钾钠基无铅压电陶瓷的化学计量比为：(1‑x)K0.48Na0.52NbO3‑x(NaSbO3+(Bi0.45Sm0.05)Li0.5ZrO3)，其中x=0，0.01，0.02，0.03，0.04，0.05，0.06。制备方法是将 K2CO3，Na2CO3，Li2CO3，Nb2O5，Sb2O5，Bi2O3，Sm2O3，ZrO2，这几种原料按照化学计量比称量好，进行配料，经过球磨、烘干后在870℃预烧6h得到预烧粉，再经过二次球磨、烘干、造粒、压片、排胶后，在1080‑1120℃下烧结，最后经过被银和极化操作后，制得较高压电常数的陶瓷片。本发明通过将 (NaSbO3+(Bi0.45Sm0.05)Li0.5ZrO3)掺杂在KNN基无铅压电陶瓷中，并对烧结工艺进行改进，提高了该压电陶瓷电学性能，其介电常数εr=2000，居里温度TC=267℃，压电常数d33=340pC/N。
Potassium-sodium niobate-based leadless piezoelectric ceramic and preparation method thereof
一种铌酸钾钠基无铅压电陶瓷及其制备方法
DU YI (Autor:in) / LIU WEIPENG (Autor:in)
05.11.2021
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
| Europäisches Patentamt | 2021
Potassium-sodium niobate-based leadless piezoelectric ceramic and preparation method thereof
| Europäisches Patentamt | 2022
Potassium-sodium niobate-based leadless piezoelectric ceramic and preparation method thereof
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Potassium-sodium niobate-based leadless piezoelectric ceramic and preparation method thereof
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